Torsional provisions in building codes

Author:

Tso W. K.,Meng V.

Abstract

A study is made of the accuracy of the static code provisions on torsional effects, with special reference to the National Building Code of Canada of 1977. A uniform frame type monosymmetric 12-story building is used as an example. The static story torque is compared with the dynamic torque computed using the response spectrum technique as outlined in Commentary K of the Code. It has been found that for a building with uniform eccentricity, the static code torque estimate is good if the effect of sympathetic coupled torsional–lateral resonance is small. At the sympathetic coupled resonance, the static code torsional provision underestimates the story torque by a factor of approximately two. Also, it is shown that for buildings with large eccentricities, sympathetic resonance is unlikely to occur and the current Code requirement of doubling the computed torque for design is a very conservative requirement.In addition, the eccentricity expression given in the 1980 Code is used to estimate the story torques for eccentrically set-back buildings and its accuracy is checked with a response spectrum technique. It is concluded that for irregular structures, such as eccentrically set-back buildings, a dynamic analysis is the only reliable procedure for the estimation of the torque loading on the building.

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

Cited by 11 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Seismic code analysis of multi-storey asymmetric buildings;Earthquake Engineering & Structural Dynamics;1998-02

2. A simplified model for analysis and design of asymmetric-plan buildings;Earthquake Engineering & Structural Dynamics;1995-04

3. Understanding the inelastic seismic behaviour of asymmetric-plan buildings;Earthquake Engineering & Structural Dynamics;1995-04

4. Dual‐Level Approach for Seismic Design of Asymmetric‐Plan Buildings;Journal of Structural Engineering;1994-01

5. Evaluation of Torsional Provisions in Seismic Codes;Journal of Structural Engineering;1991-12

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