某框架结构的防屈曲支撑位置布置优化

Layout optimization of buckling restrained braces for a frame structure

为了提高框架结构的减震性能,文章先通过遗传算法算得各层防屈曲支撑布置需求量.再从某框架结构的支撑优化布置形式着手,对该结构拟定6种防屈曲支撑布置方案,分别为:外边角端布置形式(方案a)、外围隔跨布置形式(方案b)、外围中心连续布置形式(方案c)、内框架边角端布置形式(方案d)、中心对U型布置形式(方案e)、中心筒型布置形式(方案f).然后对比分析6个模型分别在承受相同地震作用的条件下的指标结果,研究结果表明:(1)在结构静、动力非线性分析中,方案c对于防屈曲支撑利用率增加及结构抗侧刚度的提升较为明显.(2)在Morgan地震波作用下,方案c中防屈曲支撑在罕遇地震作用下,吸收地震能量最多.另在地震波作用下的耗能占比中分析得到,方案c中的防屈曲支撑耗能占比最大,且防屈曲支撑的滞回性能最佳.

In order to improve the seismic performance of frame structures,the paper first calculates the layout requirements of buckling-resistant braces for each floor by genetic algorithm.Then six kinds of anti-buckling brace layout schemes for a frame structure are worked out based on the optimal brace layout of a frame structure.They are:outer corner arrangement(scheme a),outer spanning arrangement(scheme b),outer central continuous arrangement(scheme c),inner frame corner arrangement(scheme d)and center-to-U.Type layout(scheme e)and center cylinder layout(scheme f).Then the index results of the six models under the same seismic action are compared and analyzed.The results show that:(1)In the static and dynamic non-linear analysis of the structure,the increase of utilization ratio of buckling-resistant braces and lateral stiffness of the structure is more obvious in scheme C.(2)Under the action of Morgan seismic wave,the buckling-proof brace in scheme C absorbs the most seismic energy under rare earthquakes.In addition,the proportion of energy dissipation under seismic wave is analyzed,and the buckling-resistant brace in scheme C has the largest proportion of energy dissipation,and the hysteretic performance of buckling-resistant brace is the best.