Innovative Exterior Lattice Shell Tube Buildings Subjected to Wind and Seismic Loading

Jayesh A. Dalal, M.Tech Research scholar, Dr. Atul K. Desai, Professor at Applied Mechanics Department, Sardar Vallabhbhai National Institute of Technology, Surat.

Introduction

The aftermath of an earthquake manifests great devastation due to unpredicted seismic motion striking extensive damage to innumerable buildings of varying degree, i.e. either full or partial. This damage to structures in turn causes irreparable loss of life with a large number of casualties.

Structures are designed to resist moderate and frequently occurring earthquakes must have sufficient stiffness and strength to control deflection and to prevent any possible damage. However, it is inappropriate to design a structure to remain in the elastic region, under severe earthquakes, because of the economic constraints. The inherent damping of yielding structural elements can advantageously be utilized to lower the strength requirement, leading to a more economical design. This yielding usually provides the ductility or toughness of the structure against the sudden brittle type structural failure.

A building must have a complete structural system capable of carrying all gravity loads to its foundation in life span of building. While dealing with lateral forces, there is a natural trend to manage these forces with same methods used for gravity loads. Conventionally designed columns of a structure cannot carry the weight of the building and tolerate the large sideways movement caused by the motions of earthquake and/or wind. Earthquake and wind gusts are idealized as equivalent static load of certain magnitude that must be resisted by the structure.

This study examines the lattice shell tube structure in the modeling of earthquake and wind flow around tall buildings of cross sectional shape, but same cross sectional area, consequently predicting the response of the structures under generated wind loads. It focuses on analysis of tall structures under static earthquake and static wind loading. ETABS 9.7.1 software has been used to analysis of the models for this study.

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