动力激励下桁架钢结构时空响应特性及抗震优化措施  

Spatiotemporal Response Characteristics and Seismic Optimization Measures for Truss Steel Structures Under Dynamic Excitation

作　　者：李双来 LI Shuanglai(China Railway Construction Group Co.Ltd.,Beijing 100040,China)

机构地区：[1]中铁建设集团有限公司,北京100040

出　　处：《铁道建筑技术》2025年第1期200-204,共5页Railway Construction Technology

基　　金：中铁建设集团有限公司科研计划项目(2023-04a)。

摘　　要：桁架钢结构由于较大的跨度,在地震作用下会受到较大的水平力和竖向力,进而容易产生较大的变形和位移。本文以重庆东站站房工程为例,通过现场监测分析了不同震级下桁架钢结构的位移变化,深入研究了动力激励下桁架钢结构的时空响应特性及抗震优化措施。结果表明:随着震级的增加桁架钢结构的位移呈现逐渐增加的趋势,而其达到最大位移所需的时间则呈现逐渐减小的趋势,2级震波在8 s时达最大位移2.1 mm,而6级震波仅需2.5 s就可达到12.3 mm的位移;由于桁架中部在结构中更容易受到弯矩和剪力的影响,而两端受到更强的约束作用,因此其位移呈现出从两端向中部位移逐渐增加的趋势;可采用控制桁架钢结构的高度、跨距或采用耗能减震器的方式来降低其位移量,从而提高桁架钢结构的抗震性。Due to its large span,the truss steel structure is subjected to significant horizontal and vertical forces during seismic events,which can lead to substantial deformation and displacement.This paper uses Chongqing East Railway Station as a case study to analyze the displacement changes of the truss steel structure under different seismic magnitudes through on-site monitoring.It thoroughly investigates the spatiotemporal response characteristics of the structure under dynamic excitation and explores seismic optimization measures.The results show that the displacement of the truss steel structure increases gradually with the seismic magnitude,while the time to reach maximum displacement decreases gradually.For a level 2 seismic wave,the maximum displacement reaches 2.1 mm in 8 seconds,whereas for a level 6 seismic wave,it can reach 12.3 mm in only 25 seconds.The middle part of the truss is more susceptible to bending moments and shear forces,while the ends are more strongly restrained,thus,the displacement trend increases from the ends towards the middle.To improve the seismic performance of the truss steel structure,the height and span can be controlled,or energy-dissipating shock absorbers can be utilized to reduce the displacement.

关 键 词：桁架钢结构 地震影响 位移监测 震级 耗能减震器 时空响应特性 

分 类 号：TU248.1[建筑科学—建筑设计及理论] TU311.3