High Rise Towers: A FEW Structural Issues

High Rise

Towers: A FEW

Structural

Issues Presentation by: Dr. Manmohan Maniyar, Mumbai

Presentation by

Dr. Manmohan Maniyar

STERLING ENGINEERING CONSULTANCY SERVICES

SOME OF THE WELL-KNOWN

HIGH RISE TOWERS: WORLD

Burj Khalifa Height 828 m Floors 163

Taipei 101 - Height 509 m Floors 101

Shanghai World Financial Center - Height 492 m Floors 101

International Commerce Centre - Height 484 m Floors 108

Petronas Tower Height 452 m Floors 88

SOME OF THE WELL-KNOWN

HIGH RISE TOWERS: INDIA

Palais Royale Height 320 m Floors 75

Avigna Height 266 m Floors 64

Imperial Tower Height 254 m Floors 61

India Tower Height 524 m Floors 124 +170 m spire

World One

CASE STUDIES FOR SPECIAL INVESTIGATIONS

Lateral Loads

Seismic Site specific response spectra

Wind Wind tunnel report and TLD


Seismic Site specific response spectra

EARTHQUAKE SOURCES: Movement of Earth’s Plates

SOME BASIC

SEISMIC

CONCEPTS

Presentation by: Dr. Manmohan Maniyar, Mumbai

Drift of Indian Sub Continent


How Buildings behave in seismic event: Time History a closure look.


EFFECT OF EARTHQUAKE FORCE

Earthquake causes shaking of the ground.

Accellerogram of N78E component Accellerogram of N12W component

Ground motions recorded at Ahmadabad during the Bhuj earthquake.


SEISMIC TIME HISTORY LOAD


WHAT IS SEISMIC HAZARD



INDIAN SEISMICITY


RETURN PERIOD AND SEISMIC EVENT MAGNITUDE


DESIGN BASIS EARTHQUAKE (DBE)

EARTHQUAKES WHICH HAVE 10%, PROBABILITY OF EXCEEDANCE IN 50 YEARS WITH RETURN PERIODS OF APPROXIMATELY 475 YEARS.


MAXIMUM CONSIDERED EARTHQUAKE (MCE)

EARTHQUAKES WHICH HAVE 2%, PROBABILITY OF EXCEEDANCE IN 50 YEARS WITH RETURN PERIODS OF APPROXIMATELY 2475 YEARS.


RESPONSE SPECTRUM



Seismotectonic Map of Mumbai Region

Ref: S. T. G. Raghu Kanth and R. N. Iyengar, 2006


Lateral Loads

Wind Wind tunnel report and TLD

Global axes ETABS and WT Model

WIND TUNNEL TESTS

Study Model and Surroundings

Configuration 1:

Proposed Prince Tower with King Tower and existing and in-construction surroundings

Configuration 2:

Proposed Prince Tower with remainder of Alpha development and existing

and in-construction surroundings

Configuration 3: Proposed Prince Tower with remainder of Alpha development and

existing, in-construction and all known future surroundings

STRUCTURAL DYNAMIC PROPERTIES TO BE PROVIDED BY STRUCTURAL DESIGNER FOR WT ANALYSIS

Diaphragm Mass Data and story data

Modal Data

Modal mass participation data

Pe data

Mode shapes data

WIND CLIMATE ASSESSMENT

Based on the results of these analyses and subsequent discussions, for Mumbai, RWDI recommends using a 50-year return period Basic Wind Speed (3-seconds gust) of 44 m/s for load calculations. For acceleration predictions, RWDI recommends using a 10-year Basic Wind Speed (3-seconds gust) of 32.5m/s.

WIND TUNNEL PROCEDURES

Peak overall structural wind loads

Directional distribution of local wind speeds

Base overturning moments



Base Shears

Base Shears

Wind induced acceleration Prediction

Wind induced acceleration Prediction

THANKS


High Rise Towers: A FEW Structural Issues

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