某细长建筑结构设计及防屈曲约束支撑应用分析

Structural design of a slender building and application analysis of buckling restrained braces

某建筑A楼位于甘肃省兰州市,平面呈细长型,扭转刚度差。通过对无支撑方案、普通钢支撑方案、防屈曲约束支撑方案的计算比较分析,选取了防屈曲约束支撑方案。分析了多遇地震作用、中震作用、罕遇地震作用下,防屈曲约束支撑的抗震性能。结果表明:采用防屈曲支撑结构有效控制了结构扭转,同时避免了局部的受力过度集中,具有良好的受力性能,能够达到“小震不坏、中震可修、大震不倒”的性能目标。对超长结构进行了温度作用下的楼板应力分析,为设计提供依据。

A building is located in Lanzhou City,Gansu Province,with a slender plane and poor torsional stiffness.Through the calculation and comparative analysis of unsupported scheme,ordinary steel support scheme and buckling restrained support scheme,the buckling restrained support scheme is selected.The seismic performance of buckling restrained braces under frequent earthquake,moderate earthquake and rare earthquake is analyzed.The result shows that the anti buckling brace structure can effectively control the structural torsion,avoid local excessive stress concentration,have good mechanical performance,and can achieve the performance goal of “no damage in small earthquake,repairable in medium earthquake and no collapse in large earthquake”.The slab stress analysis of super long structure under temperature is carried out to provide basis for design.