High-Rise and Complex Building Construction

Introduction

High-rise construction is the coordinated assembly of structural, architectural, building-services and logistics systems in a restricted vertical site. Unlike low-rise work, materials, workers, equipment and information must move through a narrow footprint while the building is exposed to wind, weather, construction-stage instability and increasingly complex interfaces. A small error in setting out, sequencing or services coordination can be repeated on many floors and become expensive to correct.

A high-rise project is therefore not simply a taller version of an ordinary building. It requires an integrated construction strategy covering ground investigation, deep foundations, the vertical structural system, temporary works, lifting, façade installation, fire and life safety, building services, quality assurance and commissioning.

Learning Objectives

By the end of this chapter, the learner should be able to:

• explain why deep foundations and stiff lateral-load-resisting systems are used;
• describe core-and-frame, wall-frame and tube-based structural systems;
• compare climbing formwork methods;
• plan the safe use of tower cranes and vertical logistics systems;
• explain façade installation and building-services coordination;
• develop a logical construction sequence for a tall building;
• identify practical, safety, quality and regulatory risks.

1. Characteristics of High-Rise and Complex Buildings

A high-rise building commonly has a large number of repetitive floors, a heavily loaded foundation system, substantial wind effects and a high dependence on vertical transportation. A complex building may also include transfer floors, large column-free spaces, irregular geometry, mixed structural systems, deep basements, atria, long-span roofs or different occupancy types.

The principal construction constraints are:

1. Limited site area: storage, access, welfare facilities and lifting zones compete for space.
2. Vertical repetition: defects in one typical floor can be multiplied throughout the building.
3. Lateral movement: wind and construction-stage effects influence structure, façade, partitions and services.
4. Interface density: structure, cladding, lifts, sprinklers, ducts, electrical containment and finishes occupy the same zones.
5. Safety exposure: falling objects, open edges, lifting operations, temporary stability and evacuation require rigorous control.
6. Weather and environment: wind limits crane operations, while rain, heat and dust affect concrete, façade sealants and finishes.

The project should be managed through coordinated design information, a constructability review, a responsibility matrix and a short-interval production plan. Building information modelling (BIM) can support this process, but it does not replace engineering judgement or approved drawings.

2. Deep Foundations

2.1 Purpose and selection

Deep foundations transfer building actions through weak or compressible near-surface soils to stronger strata, or develop resistance through shaft friction and end bearing. They are considered where shallow foundations would experience excessive settlement, insufficient bearing resistance, unacceptable differential movement or instability caused by excavation and groundwater.

Common systems include:

• Bored piles: drilled shafts, usually reinforced and concreted in place; suitable where vibration must be controlled.
• Driven piles: prefabricated steel, concrete or timber elements driven by hammer or vibratory equipment; rapid, but potentially noisy and disruptive.
• Barrette foundations: rectangular deep foundation elements useful where large axial and lateral capacities are required.
• Diaphragm walls: reinforced concrete walls formed in slurry-supported trenches; used for basement retention and sometimes as permanent walls.
• Piled rafts: a raft shares load with piles, reducing settlement and improving performance rather than requiring every load to be carried solely by piles.

Selection depends on soil profile, groundwater, adjacent structures, noise and vibration limits, available equipment, construction access, load demand and environmental requirements.

2.2 Basic pile resistance

For a single pile under axial compression, an idealised ultimate resistance may be represented as:

where Q_u is ultimate axial resistance, Q_s is shaft resistance and Q_b is base or end-bearing resistance. A simplified shaft component is:

where f_s is unit shaft resistance in each soil layer and A_s is the pile surface area in that layer. For a circular pile, the surface area over a layer of thickness L is πDL, where D is pile diameter. These expressions are idealisations; actual design requires appropriate soil parameters, groundwater conditions, load combinations, group effects, negative skin friction and code-specified safety or resistance factors.

The allowable or design resistance is not obtained by blindly dividing by one universal factor. The applicable building code may use a global factor of safety or partial factors. Pile groups may have lower efficiency than the sum of individual piles because soil stresses overlap. Testing may include static load tests, dynamic tests, integrity testing and cross-hole sonic logging, as appropriate.

2.3 Construction controls

Important controls include accurate setting out, casing or slurry stability, bore cleanliness, reinforcement cage position, concrete continuity, tremie placement under slurry or water, pile records and integrity verification. Concrete placed by tremie must maintain a continuous embedded pipe so that contaminated material is displaced rather than trapped in the shaft.

A pile installation record should identify location, diameter, depth, drilling time, strata, groundwater, concrete volume, reinforcement, obstructions and test results. Deviations must be assessed by the designer; they should not be concealed by proceeding with the next operation.

3. Structural Systems and the Vertical Core

3.1 Core-and-frame systems

A reinforced-concrete core commonly contains lifts, stairs, risers and refuge or service zones. It provides lateral stiffness and torsional resistance, while perimeter columns and floor slabs carry gravity loads and contribute to lateral resistance. The core also acts as the principal vertical circulation and services spine.

Other systems include:

The construction team must understand the intended load path. Temporary removal of props, premature stressing, unplanned openings or loading a transfer slab before strength is achieved can alter that load path.

3.2 Construction-stage stability

The completed building may be stable while the partially built structure is not. Temporary bracing, core walls, floor diaphragms, column continuity and crane ties must therefore be checked at each stage. Survey monitoring can detect cumulative drift, settlement or out-of-plumb conditions. Concrete strength, not merely elapsed time, should govern striking and loading decisions where specified by the engineer.

4. Climbing Formwork and Repetitive Floor Construction

Climbing formwork permits form panels and working platforms to move upward as the core rises. Systems include:

• Jump form: crane-assisted movement between pours;
• Self-climbing form: hydraulic or mechanically operated climbing, usually anchored to previously completed concrete;
• Slipform: continuously rising formwork, suitable for relatively uniform cores but demanding continuous concrete supply and close control;
• Table or flying forms: large slab formwork units moved between floors, often by crane or specially designed lifting equipment.

A typical core cycle includes survey and preparation, reinforcement installation, embedded items and openings, form inspection, concrete placement, curing and strength verification, climbing, and handover to the next trade. Cycle duration depends on floor geometry, reinforcement congestion, concrete supply, weather, inspection requirements and lifting capacity.

Climbing systems require engineered anchorage, verified concrete strength, exclusion zones, wind limits, rescue arrangements and inspection of hydraulic or mechanical components. Workers must never occupy a platform during an unauthorised or uncontrolled climb.

4.1 Floor-cycle planning

A practical floor plan divides work into zones and defines predecessors. For example, core climbing may lead the perimeter frame; slab reinforcement follows edge beams and sleeves; mechanical and electrical rough-in follows slab release; façade brackets and edge protection precede façade panels. The exact lead-lag relationship must be established for the selected system rather than assumed.

A production control board or digital schedule should record planned and actual dates, constraints, inspections, concrete test results, outstanding design information and safety permits. Repetition makes standardisation valuable: approved mock-ups, checklists and first-run studies can prevent recurring defects.

5. Tower Cranes and Vertical Logistics

5.1 Tower-crane planning

Crane selection considers maximum radius, maximum load, hook height, wind exposure, foundation or tie design, erection and dismantling method, power supply, interference with neighbouring cranes and the final removal strategy. A crane load chart must be read at the relevant radius; maximum rated capacity at minimum radius cannot be used for every lift.

The crane base, anchorages and ties are temporary works requiring design and inspection. Crane foundations may be independent, integrated with the permanent structure or supported through a designed opening. The arrangement must account for overturning effects, local punching or bursting, construction loads and future removal.

5.2 Productivity estimate

A simple planning estimate for crane productivity is:

where P is estimated lifts per hour, Wc is the working fraction of an hour, expressed as a decimal, and Tc is average cycle time in minutes per lift. The estimate assumes reasonably uniform lifts and does not include unplanned delays unless they are included in Wc. For example, if the working fraction is 0.75 and the cycle time is 6 minutes, P = 60 × 0.75 ÷ 6 = 7.5 lifts per hour. This is a planning estimate, not a guarantee of output.

Vertical logistics also includes hoists, material platforms, concrete pumps, passenger lifts used under controlled construction arrangements, loading bays, waste routes and temporary stairs. A logistics plan should specify who may book each resource, maximum loads, delivery windows, storage limits and emergency access.

5.3 Safe lifting practice

Every lift requires a suitable lifting plan, competent operators and slingers, inspected accessories, known load mass, secure attachment, exclusion zones and communication. Suspended loads should not travel over people. Wind thresholds, visibility, radio failure and power interruption procedures must be defined. Lifting operations must comply with local lifting-equipment legislation and the manufacturer’s instructions.

6. Façade Installation

Façades provide weather resistance, thermal and acoustic performance, daylight control, fire containment and architectural identity. Typical systems include unitised curtain walling, stick curtain walling, precast concrete panels, stone or ceramic rainscreens, metal panels and composite systems.

Installation requires verified slab edges, cast-in channels or brackets, surveyed reference lines, temporary protection, panel lifting equipment and controlled sealant conditions. A unitised system is assembled into factory-made panels and installed floor by floor; it can be rapid and quality-controlled but demands accurate interfaces and storage planning. Stick systems assemble mullions, transoms and infill on site and can accommodate some adjustment, but involve more site operations.

Critical façade issues include:

• dimensional tolerance and building movement;
• anchors and brackets resisting gravity and wind actions;
• fire stopping at slab edges and around penetrations;
• drainage and pressure equalisation;
• sealant compatibility, curing and joint preparation;
• protection against damage from later trades;
• water, air, thermal and acoustic testing.

A full-scale or representative mock-up should verify appearance, interfaces, access, sealants and performance before mass installation. Façade installation should generally follow a protected sequence behind the structure, while internal trades must not damage completed weather seals or fire barriers.

7. Building Services Coordination

Tall buildings contain dense mechanical, electrical, plumbing, fire protection, communication, controls and vertical-transport systems. Services coordination begins during design, not after the structure is complete.

A coordination process should establish:

1. a shared coordinate system and level datum;
2. reserved risers, plant rooms, shafts and ceiling zones;
3. equipment access and replacement routes;
4. sleeve, opening and embedment requirements before concrete placement;
5. fire, acoustic, waterproofing and structural requirements at penetrations;
6. inspection, testing, commissioning and handover responsibilities.

BIM clash detection is useful for identifying geometric conflicts, but a clash-free model does not ensure maintainability, fire compliance, pressure performance or access. Each issue should have an owner, due date, approved resolution and record of revision.

The usual vertical arrangement is a central services spine with horizontal distribution on each floor. Pressure zones, pump locations, drainage gradients, smoke-control zones, electrical distribution and lift zoning must be coordinated with the structural and architectural design. Temporary services are also necessary: construction power, lighting, drainage, water, fire protection, communications and worker transportation.

8. Integrated Construction Sequence

A representative sequence is:

1. investigation, surveys, permits, hoarding and utility protection;
2. excavation support, dewatering and basement works;
3. piles, pile caps, raft and basement structure;
4. core construction using climbing or jump form;
5. perimeter columns, beams and slabs;
6. crane ties, hoists and temporary edge protection;
7. façade brackets, panels and fire-stopping;
8. services risers, plant rooms and floor distribution;
9. partitions, finishes, testing and commissioning;
10. integrated systems testing, statutory inspections and handover.

This is not a universal sequence. Transfer floors, outriggers, post-tensioned slabs, prefabricated bathrooms, façade access systems and specialist plant may change the order. A sound sequence respects curing and strength requirements, provides stable temporary conditions, protects completed work and keeps the critical path supplied with labour, materials and information.

9. Illustrative Case: Coordinating a 35-Storey Mixed-Use Tower

Background

This illustrative case concerns a 35-storey tower over a three-level basement on a constrained urban site. The upper floors contain apartments, while the lower floors contain offices and retail space. The site has weak fill over dense sand, a high groundwater table and neighbouring buildings close to the excavation.

Problem

The initial programme proposed separate structural, façade and services teams working independently. Early coordination identified three risks: pile drilling could affect neighbouring structures; the mechanical risers conflicted with transfer beams; and the proposed façade delivery route blocked the only emergency access.

Analysis and approach

The project team selected bored piles with a secant-pile excavation wall because vibration limits were strict. A piled raft was evaluated to control settlement. The core was designed as the primary lateral system, with an outrigger at a mechanical floor. A self-climbing core form led a four-day structural floor cycle, subject to inspection and concrete-strength release.

A logistics plan placed a tower crane inside a designed core opening, with a material hoist on the east elevation. Unitised façade panels were delivered during night windows and installed several floors below the structural leading edge. A federated BIM model coordinated risers, sleeves, transfer beams and fire-stopping zones. The emergency route was maintained by scheduling façade deliveries away from the access line.

Outcome

Pile integrity testing and settlement monitoring provided evidence for foundation acceptance. A first-floor services mock-up revealed inadequate access to a valve assembly, allowing relocation before repetition. The core, frame, façade and services teams used a shared three-week look-ahead plan, reducing waiting caused by missing embeds and late approvals.

Learning points

The case demonstrates that high-rise productivity depends on interfaces rather than isolated trade speed. Early ground and temporary-works decisions influence the whole programme. Mock-ups, survey control, model-based coordination and explicit logistics ownership are practical risk-reduction measures.

10. Quality, Safety, Environment and Governance

High-rise work requires a documented inspection and test plan. Hold points may include pile reinforcement and bore inspection, concrete placement, formwork and reinforcement release, façade anchor inspection, fire-stopping inspection, pressure testing, electrical testing and integrated commissioning.

Major hazards include falls from height, falling objects, crane collisions, suspended loads, temporary instability, formwork failure, excavation collapse, exposure to wet concrete, fire and delayed emergency evacuation. Controls follow the hierarchy of elimination, substitution, engineering controls, administrative controls and personal protective equipment. Edge protection, protected openings, debris containment, rescue plans and emergency communication must be designed into the work rather than added informally.

Environmental management includes spoil classification, groundwater treatment, concrete washout, dust and noise control, material waste reduction, energy use and responsible sourcing. Governance requires approved design changes, traceable inspection records, competence verification and transparent reporting of nonconformities. Pressuring workers to conceal defects or bypass a hold point is both unsafe and professionally unacceptable.

11. Technology and Contemporary Practice

Digital twins, laser scanning, robotic total stations, sensor-based monitoring, prefabrication, modular plant rooms and automated progress capture can improve coordination and quality. Artificial intelligence may assist with image-based safety observations, schedule-risk forecasting or document search, but outputs require human verification. It should not independently approve structural changes, safety-critical lifts or statutory compliance.

Industrialised construction can move repetitive work into controlled factory conditions. However, transport dimensions, connection tolerances, lifting capacity, fire performance, acoustic separation and late design changes must be resolved early. Technology is valuable when it supports a clear process, reliable data and accountable decisions.

Chapter Summary

High-rise construction combines deep foundations, a stiff and stable vertical structural system, repetitive formwork, high-capacity lifting and carefully controlled vertical logistics. Deep foundations are selected from ground conditions, load demands, settlement limits and environmental constraints. Core-and-frame, wall, tube and outrigger systems provide different methods of carrying gravity and lateral actions.

Climbing formwork and floor-cycle planning create repetition, but require verified concrete strength, engineered anchors and safe temporary conditions. Tower cranes, hoists and delivery systems must be planned as a single logistics network. Façade installation depends on survey accuracy, movement, fire stopping, weather seals and testing. Services coordination must reserve space, openings and access before construction proceeds.

The most reliable projects integrate design, temporary works, procurement, safety, quality, logistics, commissioning and handover from the beginning. BIM, scanning, sensors and AI can support this integration, but responsibility remains with competent professionals and approved governance processes.

Key Terms

Deep foundation: A foundation transferring load to deeper soil or rock through end bearing, shaft resistance, or both.

Bored pile: A cast-in-place pile formed in a drilled excavation.

Piled raft: A raft foundation assisted by piles to improve capacity or settlement performance.

Diaphragm wall: A reinforced concrete wall formed in a slurry-supported trench.

Core: A stiff vertical building zone containing circulation, services and often lateral-load-resisting walls.

Outrigger: A structural system connecting a core to perimeter columns at selected levels.

Jump form: Formwork moved in stages between concrete pours.

Self-climbing form: Formwork raised using its own mechanical or hydraulic system.

Slipform: Continuously rising formwork used with continuous concrete operations.

Floor cycle: The planned sequence and duration for completing a typical floor.

Tower crane: A site crane with a vertical mast and horizontal or luffing jib.

Vertical logistics: Planned movement of people, materials and waste through the building height.

Unitised façade: Factory-assembled façade panels installed as units.

Fire stopping: Construction that limits fire and smoke spread at joints and penetrations.

Riser: A vertical shaft or route for building services.

BIM: A coordinated digital representation of building information and geometry.

Temporary works: Structures or systems needed to support construction but not necessarily retained permanently.

Commissioning: Verification that building systems operate as intended.

Transfer floor: A level where structural load paths change between different grids or systems.

Review Questions

Short Answer Questions

1. Why are deep foundations commonly used for tall buildings?
2. State two functions of a reinforced-concrete core.
3. Distinguish between jump form and slipform.
4. Identify four factors considered when selecting a tower crane.
5. Why is fire stopping important at façade and services penetrations?

Long Answer Questions

1. Explain the selection, construction and quality-control requirements of bored piles.
2. Compare core-and-frame, shear-wall, tube and outrigger structural systems.
3. Describe a safe and productive floor-cycle sequence using climbing formwork.
4. Explain how façade installation should be coordinated with structure and services.
5. Discuss the role of BIM in services coordination and its limitations.

Analytical / Application Questions

1. A tower crane has a working fraction of 0.75 and an average cycle time of 6 minutes. Using P = 60Wc/Tc, calculate the estimated lifts per hour and state one reason actual output may be lower.
2. A constrained urban site has weak surface soil, sensitive neighbours and a high water table. Recommend a foundation and excavation strategy, identifying the investigations and monitoring required.
3. Develop a high-level construction sequence for a 30-storey building with a central core, unitised façade, two basement levels and dense mechanical services. Explain three critical interfaces and how you would control them.

Multiple Choice Questions with Answers

Question 1

Which component primarily provides end-bearing resistance in a pile?

A. The pile cap only

B. The pile base or toe

C. The temporary casing

D. The reinforcement cage

Correct Answer: B. The pile base or toe

Question 2

What is a principal function of a high-rise building core?

A. To store all façade panels

B. To provide lateral stiffness and contain circulation or services

C. To replace every perimeter column

D. To eliminate the need for foundations

Correct Answer: B. To provide lateral stiffness and contain circulation or services

Question 3

Which formwork system rises continuously while concrete placement continues?

A. Slipform

B. Table form

C. Jump form

D. Fixed timber form

Correct Answer: A. Slipform

Question 4

A crane works for 0.75 of each hour and has a six-minute cycle. What is its estimated productivity?

A. 4.5 lifts per hour

B. 6.0 lifts per hour

C. 7.5 lifts per hour

D. 10.0 lifts per hour

Correct Answer: C. 7.5 lifts per hour

Question 5

Which factor is essential when reading a tower-crane load chart?

A. Paint colour

B. Load radius

C. Number of site offices

D. Floor finish type

Correct Answer: B. Load radius

Question 6

What is a major advantage of unitised curtain walling?

A. It requires no dimensional accuracy

B. Panels can be factory assembled and installed rapidly

C. It eliminates the need for fire stopping

D. It cannot be damaged by later trades

Correct Answer: B. Panels can be factory assembled and installed rapidly

Question 7

What should be coordinated before concrete placement?

A. Only final decoration colours

B. Sleeves, openings and embedded items

C. Only post-handover maintenance

D. Furniture delivery routes only

Correct Answer: B. Sleeves, openings and embedded items

Question 8

Why are temporary works especially important in high-rise construction?

A. The completed building is always unstable

B. Partially completed structures may have different stability and load paths

C. Temporary works replace all permanent design

D. They remove the need for inspections

Correct Answer: B. Partially completed structures may have different stability and load paths

Question 9

Which activity verifies that installed building systems operate together as intended?

A. Excavation

B. Commissioning

C. Form stripping

D. Survey setting out

Correct Answer: B. Commissioning

Question 10

What is an appropriate limitation of AI in construction safety management?

A. It can never process images

B. It should independently approve safety-critical operations

C. Its outputs require competent human verification

D. It makes documentation unnecessary

Correct Answer: C. Its outputs require competent human verification