弯曲屈服型耗能梁K形偏心支撑结构抗震性能研究  

Study on seismic behavior of K-eccentrically braced structures with flexural links

作　　者：章卫松 吴杨周 于海丰[2] 马康 王焱 陈世玺 黄友强 Zhang Wei-song;Wu Yang-zhou;Yu Hai-feng;Ma Kang;Wang Yan;Chen Shi-xi;Huang You-qiang(State Nuclear Electric Power Planning Design&Research Institute Co.Ltd,Beijing 100095,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]国核电力规划设计研究院有限公司,北京100095 [2]河北科技大学建筑工程学院,河北石家庄050018

出　　处：《工程抗震与加固改造》2021年第3期57-65,23,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51208169);河北科技大学研究生创新资助项目(2020)。

摘　　要：基于削弱耗能梁翼缘截面尺寸的原理,提出了一种弯曲屈服型耗能梁偏心支撑钢框架构造(简写为M2)。为验证其抗震性能并与传统的弯曲屈服型耗能梁K形偏心支撑钢框架(框架梁与耗能梁等截面,简写为M1)对比,完成了2个1∶2.6缩尺的单层、单榀、单跨模型的拟静力试验及数值模拟。结果表明,两个模型的塑性变形基本集中于耗能梁段上,试验结束时两个模型的承载力均未出现下降。M2模型的承载力、初始刚度、耗散能量均略低于M1模型,但是耗能梁段的转动能力、结构的整体延性等两者基本一致,M2模型的用钢量较M1模型减少9%。总体上,M2模型在与M1模型抗震性能相差不多的前提下提高了经济性,实际工程中建议采用。数值模拟结果与试验结果整体上吻合较好,证明了可以采用数值方法开展偏心支撑钢框架结构抗震性能的研究。Based on the principle of reduction of the flange cross-section of link,a new K-eccentrically braced steel frame structure with flexural link(abbreviated as M2)is proposed.To verify its seismic performance and compare it with the traditional K-eccentrically braced steel frame(abbreviated as M1),in which the flexural link is designed with the same cross-section of beam connected with it,the quasi-static test and numerical simulation of two single layer and one-bay models with 1∶2.6-scale are completed.The results show that,for the two models,the plastic deformation basely concentrates in the flexural links,and the bearing capacity does not decrease when the tests stopped.The bearing capacity,initial stiffness and the dissipation energy of the M2 model are all smaller than the M1 model,but the rotational capacity of the link and the overall ductility are basically the same for the two models,and the steel used in the M2 model is 9%less than that in the M1 model.In general,on the premise that the seismic performance of the M2 model is similar to that of the M1 model,the M2 model has the advantage of material saving and is worth popularizing as a new K-eccentrically braced steel frame structure.On the whole,the numerical simulation results are in good agreement with the test results,which proves that the numerical method can be used to study the seismic behavior of eccentrically braced steel frame structures.

关 键 词：弯曲屈服 耗能梁 截面削弱 偏心支撑钢框架 拟静力试验 用钢量 抗震性能 数值模拟 

分 类 号：TU391[建筑科学—结构工程] TU352