考虑下部结构的双向张弦梁竖向地震响应分析  

Vertical seismic response analysis of bi-directional beam string structure considering supporting frame

作　　者：刘金波 梁志勇 

机构地区：[1]辽宁省交通规划设计院有限责任公司,辽宁沈阳110166

出　　处：《河北工业科技》2017年第6期448-452,共5页Hebei Journal of Industrial Science and Technology

摘　　要：为研究考虑上下部结构协同工作的双向张弦梁的地震响应规律,采用时程分析法对一个80m×80m的双向张弦梁结构模型进行了地震响应分析。在竖向地震作用下,对其有、无下部结构和下部结构相同而支座条件不同情况的抗震性能分别进行了对比分析。结果显示,在竖向地震作用下考虑下部结构时其撑杆轴力与无下部结构时几乎相同,而此时上弦梁的竖向位移增大,屋盖周边处甚至增大几倍;下部结构相同而支座条件不同时竖向地震作用下撑杆轴力及上弦梁竖向位移几乎相同,而上弦梁的水平位移的差异较大;支座条件的改变仅影响结构各振型出现的阶数而不影响结构振型。研究结果为双向张弦梁结构的抗震设计提供了参考。In order to study the seismic response regularity of the bi-directional beam string structure considering collaborative work of the upper and lower structures,time-procedure analysis method is used to analyze the seismic response on an 80 m ×80 mbi-directional beam string structure model.Under vertical seismic action,the seismic performance of the structure without the supporting frame and the performance of the structure with the same supporting frame but different supporting frame condition is compared and analyzed.Under vertical seismic action,the axial force of brace is almost the same with or without considering the supporting frame,while the upper beam vertical displacement is increased with the supporting frame,and the surrounding of the roof even increases by several times;when supporting structure is the same but the supporting condition is different,the force of brace axial and the vertical displacement of the winding beam are almost the same,but the horizontal displacement of the winding beam is of big difference under the vertical seismic acting;changing supporting condition only affects the order of the various vibration modes of the structure,but does not affect the structural vibration modes.The research result provides some reference for the seismic design of bi-directional beam string structure.

关 键 词：悬索与张拉结构 双向张弦梁 时程分析 动力响应 协同工作 

分 类 号：TU393.3[建筑科学—结构工程]