弦支筒壳结构在多点输入下的地震响应分析  

Seismic response analysis of cable supported barrel vault structures under multi-support excitations

作　　者：乔文涛[1] 陈志华[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《空间结构》2011年第1期15-20,69,共7页Spatial Structures

基　　金：国家自然科学基金资助项目(50778122);教育部新世纪优秀人才支持计划(NECT-06-0228)

摘　　要：将拉索与柱面网壳相结合,就可以形成新的弦支结构——弦支筒壳结构.以一实际工程为例,本文将分别采用地震波一致输入和考虑行波效应的多点输入分析方法对弦支筒壳进行地震响应分析.结果表明,地震作用下单层筒壳杆件内力和撑杆内力随时间的变化都是在某一数值上下波动,而下弦索内力随时间的变化则是波动着上升.与一致输入相比,多点输入时,单层筒壳杆件内力有些发生了方向改变,有较少一部分内力减小,大部分杆件的内力增大,且随着行波速度的减小,内力增大的杆件增多,幅度加大;一部撑杆的内力增大,也有相当一部分撑杆的内力减小,且随着行波速度的增大,二者对撑杆内力的影响趋于相同;下弦索中拉力或者增大或者趋于与一致输入时相同,且随着行波速度的增大,二者对下弦索中拉力的影响趋于相同.By combining cables and the cylindrical latticed shell,a new-style cable supported structure-cable supported barrel vault structure is formed.In this paper,a practical project is taken for example.The seismic response analysis of the cable supported barrel vault is carried out by the method of single support excitation and multi-support excitations considering the earthquake wave passage effect respectively.Some conclusions are drawn as follows： under the action of earthquake,both the stress of rods in the single-layer cylindrical latticed shell and struts fluctuate around a fixed value as the time changes,but the stress of cables ascend in a fluctuated curve.Comparing with the single support excitation,under multi-support excitations,the action direction of the stress of some rods in the single-layer cylindrical latticed shell change,the stress of a few rods diminish,most of rods＇ stress augment.Moreover,the amount of rods whose stress augment increases and the augment extent of stress enhance as the traveling wave speed diminish.The stress of some struts augment,but in the meantime,some diminish,and the influence of multi-support excitations and the single support excitation on the stress of struts are going to be the same as the traveling wave speed augment.The stress of cables either augment or tend to be the same to that under the single support excitation,and the influence of multi-support excitations and single support excitation on the stress of cables are going to be the same as the traveling wave speed augment.

关 键 词：柱面网壳 弦支筒壳 多点输入 行波效应 地震响应 

分 类 号：TU394[建筑科学—结构工程]