TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES

938 AURORA BOULEVARD, CUBAO, QUEZON CITY

ARCHITECTURAL STRUCTURES
RESEARCH # 5
CASE STUDY

SUBMITTED BY: LAGADIA, DWEN GABRIELLE R.

SECTION: AR42FC3
DATE: MARCH 14, 2019
SUBMITTED TO: AR. DOMINADOR CENDANA
CASE STUDY: TAIPEI 101 (Tallest building in the world from 2004-2010)
Introduction
 Taipei 101 has a complex structural system
 it is needed for the building to withstand its harsh environment and the potential dangers surrounding it.

 Through this case study we have tried to understand

 the number of unique components of its structure
 analyze its behavior to natural disaster
 evaluate its continued ability to serve the occupants within
Overview Taipei 101 (once known as Taipei World Financial Corporation)

 Year Started – June 1998 (Mall already open)

 1,667 feet (508 meters) from ground to the tip of the spire
 101 floors above ground & 5 floors underground
 Plan Area - 50m x 50m
 Cost - $700 million
 Building Use - Office Complex + Mall
 Parking - 83,000 m2, 1800 cars
 Retail - Taipei 101 Mall (77,033 m2)
 Offices - Taiwan Stock Exchange (198,347 m2)
 Construction took 5 years to complete
 Finished in 2004
 Cost $1.8 billion
 Tallest LEED certified building in the world (LEED Platinum)
 Designed to withstand typhoon winds and earthquakes tremors common in the area east of Taiwan
 Designed to withstand gale winds of 134 mph, and the strongest earthquakes in a 2,500-year cycle.
 Designed to be flexible as well as structurally resistant.
 Because of the height of Taipei 101, and the building being located 660 feet away from a major fault line, Taipei 101
used high-performance steel construction and concrete columns.
 Most famously, RWDI designed a 660-tonne steel pendulum that serves as a tuned mass damper.
Background
Client - Taipei Financial Center Corporation.
 Architect
 C.Y.Lee & Partners
- Founded on the main principle of creating human-centered buildings that are rich in culture and
emphasize innovative design.
 Structural Engineer
 Shaw Shieh - Evergreen Consulting Engineering
- One of the largest, engineering consulting companies in Taiwan Experienced in wind and seismic
activity.
 Structural Consultant
 Thornton – Richard Tomasetti Engineers, New York City
- Designed more than half of the top ten structures in Taiwan Recognized for their talents in
overcoming special challenges Richard Tomasetti through irregular shaped, high-rise structures
Design Concept
  Pagoda Style
 Traditional Architecture
 Ties into Cultural Beliefs
 Chinese lucky “8”
 8 is a homonym and prosperity
 Even number = “rhythm and symmetry”
 Bamboo - 8 Segments
 Everlasting Strength
 Youth and Longevity
 Icon of Taiwan and Finances
 Part of Xinyin District
 Seismically Resistant Area
Structural Features / Structural System
 Braced core with belt trusses.
Podium
 Retail mall that is home to restaurants, clubs, and hundreds of fashionable stores and attractions.
 The Atrium:
 the connecting tower
 twin Vierendeel trusses that span the length of the podium.
 As a lighter mass, its steel structure is not as heavy as the tower, the foundation (piles) are fewer in number
and not as deep.
 6 Stories
Tower
 25 story truncated pyramid with an intervening floor taken up by the truss system, and eight stories of smaller
segments of eight above.
 There are also exterior curtain panels slope 5 & 7 degrees, resembling a shoot of bamboo, and tying back to the
mega-columns
 Facade is able to withstand an impact of up to 7 tons.
 Saw-toothed corners greatly reduced crosswind oscillation.
 101 Stories + 5 Story Basement
Seismic Design
 Central core
 Trusses and Bracing
 Truncated Pyramid Base
 Flexible but Sturdy Materials
 10,000 psi concrete
 60 ksi steel
 Mass Damper
 Mini Dampers on Spire
Building Components & System Central Braced Core
 Resists Moments and Gravity Loads Large Perimeter Mega-Columns
 Concrete Filled Steel Boxes - Reinforced by Moment Frame Outrigger Trusses
 8 Segments of 8 Include a Story for Structure Diagonals
 Through Occupied Space Connections
  5 Different Types
Building Components & System
Mass Tuned Damper
 18’ Diameter (Largest in World)
 728 - ton tuned
 suspended from the 92nd-87th floor
 Reduces overall building sway by 40%
$4 million
 41 steel plates in varying diameters each 125 mm thick welded together
Spire
 2 - 7-ton dampers
Energy Sink Damping Systems
 These are one of the latest damping systems available - called Tuned
Mass Damper.
 These take excess energy away from the primary structure.

BUILDING FRAME
 Materials
 60ksi Steel
 10,000 psi Concrete
 Systems
 Outrigger Trusses
 Moment Frames
 Belt Trusses
 Lateral Load Resistance
 Braced Moment Frames in the building’s core
 Outrigger from core to perimeter
 Perimeter Moment Frames Shear walls
 Basement and first 8 floors
CONSTRUCTION PROCESS
 380 piles with 3-inch concrete slab.
 Mega columns- 8 cm thick steel & 10,000 psi concrete infill to provide
for overturning.
 Walls - 5- & 7-degree slope.
 106,000 tons of steel, grade 60- 25% stronger.
 6 cranes on site – steel placement.
  Electrical & Mechanical.
 Curtain wall placement.

COLUMN SYSTEM

 Gravity loads are carried vertically by a variety of columns.

 Within the core, sixteen columns are located at the crossing points of four lines of bracing in each direction.
 The columns are box sections constructed of steel plates, filled with concrete for added strength as well as stiffness
till the 62nd floor.
 On the perimeter, up to the 26th floor, each of the four building faces has two ‘super columns,’ two ‘sub-super-
columns,’ and two corner columns.
 Each face of the perimeter above the 26th floor has the two ‘super-columns’ continue upward.
 The ‘super-columns’ and ‘sub-super-columns’ are steel box sections, filled with 10,000 psi (M70) high performance
concrete on lower floors for strength and stiffness up to the 62nd floor.
Lateral Loading System

For additional core stiffness, the lowest floors from basement to the 8th floor have concrete shear walls cast between core
columns in addition to diagonal braces.

 The most of the lateral loads will be resisted by a combination of braced cores, cantilevers from the core to the
perimeter, the super columns and the Special moment resisting frame (SMRF).
 The cantilevers (horizontal trussed from the core to the perimeter) occur at 11 levels in the structure. 5 of them are
double storey high and the rest single storey.
 16 of these members occur on each of such floors.
 The balance of perimeter framing is a sloping Special Moment Resisting Frame (SMRF), a rigidly-connected grid of
stiff beams and H shape columns which follows the tower’s exterior wall slope down each 8 story module.
 At each setback level, gravity load is transferred to ‘super-columns’ through a story-high diagonalized truss in the
plane of the SMRF.
 Above the 26th floor, only two exterior super-columns continue to rise up to the 91st floor, so the SMRF consists of
600 mm deep steel wide flange beams and columns, with columns sized to be significantly stronger than beams for
stability in the event of beam yielding.
 Each 7-story of SMRF is carried by a story-high truss to transfer gravity and cantilever forces to the super-columns,
and to handle the greater story stiffness of the core at cantilever floors.

Challenges and Structural Strategies

 Wind
 Central Core
  Height
 Truncated Pyramid Base
 Trusses and Bracing
 Foundation
 2 Slurry Wall System
 Drilled Piers
 Seismic
 Flexible but Sturdy Materials
 Mass Damper
Taipei being a coastal city the problems present are:
 Weak soil conditions (The structures tend to sink).
 Typhoon winds (High lateral displacement tends to topple structures).
 Large potential earthquakes (Generates shear forces).