Shear-lag effect and its effect on the design of high-rise buildings

Bui Thanh Dat,Alexander Traykov,Marina Traykova,D Safarik,Y Tabunschikov,V Murgul

doi:10.1051/e3sconf/20183302001

Abstract

For super high-rise buildings, the analysis and selection of suitable structural solutions are very important. The structure has not only to carry the gravity loads (self-weight, live load, etc.), but also to resist lateral loads (wind and earthquake loads). As the buildings become taller, the demand on different structural systems dramatically increases. The article considers the division of the structural systems of tall buildings into two main categories - interior structures for which the major part of the lateral load resisting system is located within the interior of the building, and exterior structures for which the major part of the lateral load resisting system is located at the building perimeter. The basic types of each of the main structural categories are described. In particular, the framed tube structures, which belong to the second main category of exterior structures, seem to be very efficient. That type of structure system allows tall buildings resist the lateral loads. However, those tube systems are affected by shear lag effect - a nonlinear distribution of stresses across the sides of the section, which is commonly found in box girders under lateral loads. Based on a numerical example, some general conclusions for the influence of the shear-lag effect on frequencies, periods, distribution and variation of the magnitude of the internal forces in the structure are presented.

Highlights

1.1 History of tall buildingsIn the late nineteenth century, tall buildings emerged in the United States of America
The framed tube structures, which belong to the second main category of exterior structures, seem to be very efficient
Shear lag effect has been studied for a long time, with the observation in box girder and any hollow structure which are subjected to lateral load

Summary

Introduction

In the late nineteenth century, tall buildings emerged in the United States of America. Based on various complex factors, such as economics, aesthetics, technology, municipal regulations and politics, tall buildings appear and rapidly increase in number in other parts of the world, especially in Asian countries, such as China, Indonesia, Japan, and United Arab Emirate. Burj Khalifa (Dubai–2010) is presently the tallest building in the world, with 163 stories and 829.8 m high. By 2020, this record is expected to be broken by the appearance of Jeddah Tower-a 167-story (1000 m) building- which is under construction in Jeddah city

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Discussion

Conclusion