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The central argument

The book opens by refusing the question it is most often asked. “How tall can we build?” is a question about ambition and materials, and it has been answered repeatedly since 1885. The question that determines whether a tower serves its city or becomes a liability is “how reliably can we build tall?” — a question about evidence, judgement, verification and delivery.

That reframing shapes everything. The book is organised as a decision framework rather than a survey. Where a conventional text catalogues systems, this one asks which system a given project, site, contractor and review process can actually deliver. Where a conventional text presents a formula, this one derives it and then states the conditions under which it stops being trustworthy.

Running underneath is a lineage. The framed tube, the bundled tube, the trussed tube and the frame–shear-wall interaction that underlies almost every tall building since were conceived in a single remarkable decade by Fazlur Rahman Khan. Khan’s insight — that at height the whole building must act as one cantilever, and the engineer’s job is to recruit as much of the plan as possible into resisting the wind — is the idea every chapter descends from.

The reference tower

The book’s most distinctive teaching device is a single fictional tower carried through all eleven worked examples.

The site is a coastal delta megacity: humid subtropical, moderate seismicity, basic wind speed 65 m/s, short-period and one-second spectral accelerations of 0.50g and 0.15g on Site Class D, with 8 m of soft alluvium over stiff terrace clay over deep dense sand, and a seasonally drawn-down water table.

The tower is 60 storeys and 220 m, a 45 m square plan, a reinforced-concrete core with a participating perimeter system, concrete at 60 MPa, seismic weight 1,200 MN, and a stiffness-consistent first period near 5.8 seconds.

The site is deliberately fictional, and stated in the parameter form every modern code uses. That is the point: substitute your own city’s values and every calculation still works. The substitution is the exercise. And the values are labelled throughout as screening-level teaching values, never as a design basis.

The panel system

The book’s teaching structure is carried by recurring coloured panels, and knowing what they are helps when describing the book to a technical buyer.

Each chapter opens with Learning Objectives and a Before You Begin panel stating the mechanics or code knowledge assumed. Through the text, Concept panels state a definition precisely and Key Relation panels isolate a governing equation that the surrounding prose then derives. Design Warning panels flag places where ordinary practice quietly fails at height — these are the most frequently cited passages, because they mark the specific traps that catch engineers arriving from mid-rise work.

Practice Context panels connect an idea to delivery reality: the soil, the supply chain, the regulator and the site crew who decide whether a design survives contact with construction. Case Study panels draw the lesson from a real tower. Takeaway panels compress a section into the one sentence worth remembering.

Each chapter closes with a Learning Check of short retrieval questions, a Reference-Tower Exercise that asks for one defended decision on the running example, a Career Connection identifying who does this work on a real project, and a Beyond This Book panel that marks honestly where an introduction ends and specialist practice begins.

That last panel matters commercially: it tells a prospective buyer exactly what the book does not claim to do, which technical readers reward.

Chapter 1 — History and Global Evolution

From tall masonry and early steel frames to tubes, outriggers, mega-frames, damping and sustainability. The chapter establishes what actually makes a building “tall” — slenderness and dynamic sensitivity, not storey count — and introduces the scaling arguments that explain why lateral response overtakes gravity as height grows.

Its most useful contribution is the distinction between code permission and code sufficiency: the fact that a code contains a system in its tables does not mean the code was calibrated for your building. The chapter closes on Khan and the tube, and on the Burj Khalifa’s buttressed core as the logical endpoint of making the plan geometry the lateral system.

Chapter 2 — Core Design Concepts

The argument that tall buildings are governed by coupled global behaviour rather than isolated member design. It separates the gravity and lateral systems, then works through the stiffness–strength–ductility triad.

The chapter’s highest-value section is on drift: two measures are routinely confused in practice, and the chapter is explicit about which governs and why the deflection amplification factor must be handled consistently. It then covers occupant acceleration and wind comfort, PΔ and second-order stability, higher modes, and differential shortening.

WE-1 checks PΔ stability at mid-height. WE-2 combines two modes by SRSS for storey shear. WE-3 derives the fundamental period — the number that everything downstream depends on.

Chapter 3 — Structural Systems

A catalogue organised as a selection problem. Core-only and core-dominant systems; the dual system of core plus perimeter frame; the outrigger principle; tube and tube-in-tube; diagrids; bracing, buckling-restrained braces, mega-frames and composites; and damping as a modifier rather than a system in its own right.

The chapter is unusually direct about delivery: it plots lateral efficiency against delivery complexity and argues that the right answer depends on the fabrication ecosystem and review capacity available, not on which system is theoretically most efficient.

WE-4 quantifies the stiffness gap and the force scale an outrigger must carry. WE-5 derives preliminary tuned-mass-damper parameters.

Chapter 4 — Wind Engineering

For major towers, wind is a dynamic serviceability and comfort problem, not only a base-shear problem. The chapter builds the design wind climate, explains precisely why code wind is necessary but not sufficient for a flexible tower, and treats vortex shedding and lock-in, directionality and surroundings, and aerodynamic mitigation through shaping.

It is candid about the wind tunnel: what it is for, when it becomes mandatory, and what a code calculation cannot tell you.

WE-6 computes along-wind base shear. WE-7 computes across-wind acceleration — and demonstrates the chapter’s thesis, since comfort, not strength, is what governs.

Chapter 5 — Earthquake Design

Prescriptive base-shear design must be supplemented by performance thinking. The chapter establishes the seismic setting, explains why prescriptive design is insufficient for towers, and introduces performance-based seismic design with its hazard levels and acceptance criteria.

WE-8 works the ASCE 7 equivalent-lateral-force base shear and lands on an uncomfortable result: the demand is governed by a prescribed minimum coefficient, a floor the spectrum never produced. The chapter does not smooth this over. It asks what has actually been demonstrated about the building’s earthquake performance when the code’s own equation was overridden by a hand-set minimum — and notes that performance-based design begins from exactly that discomfort.

Response control follows: isolation and damping, why isolation suits a stiff short-period structure such as the Los Angeles City Hall retrofit and is a poor fit for an already-flexible supertall.

Chapter 6 — Geotechnics, Foundations, and SSI

The soil is part of the tall-building structural system. Foundation strategy, soil–structure interaction, liquefaction triggering, and deep excavation with diaphragm walls.

The Millennium Tower is the case study, and it is used for something sharper than a cautionary tale: every individual check on that building passed, and it tilted anyway. The chapter turns that on the reader — which of your checks would have caught it, and if none would, what does that say about the checklist?

WE-9 computes static pile capacity by α and β methods. WE-10 works piled-raft settlement. WE-11 assesses liquefaction triggering in coastal Holocene sand.

Chapter 7 — Building Subsystems

Fire, lifts, façade, services and carbon as first-class engineering decisions rather than someone else’s problem. Fire safety and egress, including the ASET–RSET margin and why an available margin is not an acceptance criterion; vertical transportation and handling capacity; façade racking and movement tolerance; MEP risers; and embodied carbon with the mass-timber horizon.

The recurring lesson is coupling: a drift limit and a façade joint capacity are one decision, not two.

Chapter 8 — Delivery and Constructability Risk

The governing risk is often the mismatch between design ambition and delivery capacity. Constructability, concrete quality and rebar congestion, QA/QC, model control and BIM gates, construction-stage feedback, and the risk register.

This is the chapter most absent from comparable texts, and the one practising engineers tend to find most immediately useful.

Chapter 9 — The Road Ahead

A well-built tall building is defined by performance, not only height. The practice gap, a peer-review framework, benchmarking a market’s tall-building maturity, and a readiness checklist with explicit stop conditions.

It closes with the design brief: an eight-page concept package covering design basis, lateral load path, wind and comfort, seismic route, foundation and SSI, subsystem coordination, delivery risk, and a verification plan recording the evidence still needed. Each chapter’s exercise has been building one of those pages.

Back matter

Learning-check guidance and a design-brief rubric; soil mechanics compressed into six ideas for readers whose geotechnics is distant; a glossary; a notation and symbols table; an index of all eleven worked examples; and a one-page formula sheet.

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