索形优化后的双向张弦梁静载试验分析之全跨均布荷载下的上弦钢梁  

Static load test analysis of the upper steel beam of a bidirectional beam string structure after cable shape optimization for a whole span uniform load

作　　者：吴捷[1,2] 

机构地区：[1]苏州大学金螳螂建筑与城市环境学院,苏州215000 [2]东南大学土木工程学院,南京210096

出　　处：《清华大学学报（自然科学版）》2014年第11期1396-1406,共11页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(51208094)

摘　　要：基于平衡荷载值确定双向张弦实腹梁结构的形状,采用多点分配梁杠杆集中加载与跨中直接吊挂加载相结合的加载方案,设计了一个索形优化后的双向张弦梁整体结构静载试验。全跨均布对称荷载下的试验结果显示:经过索网形状优化之后,在竖向荷载达到平衡荷载值时,弯矩值接近零,结构中的应力分布较均匀且数值较小;随着全跨均布荷载的增加,轴力变化幅度在短跨方向以边榀最大,在长跨方向以跨中榀最大;弯矩的变化幅度均在2个方向的跨中榀的上弦梁跨端到1/4跨区间最显著,梁平面上靠近滑动支座的1/4区域的竖向位移最大。The shape of a bidirectional beam string structure was determined for balanced loads. The static load tests used a load scheme with lever-concentrated loading through distributive girders on multiple spots and directly hanging-loading in the center of the structure plane. The whole span uniform load tests show that when the vertical load increases to the balanced load, the beam moment is close to zero, with the stress distribution being more uniform and the value being lower. With the increase of the whole span uniform load, the axial force changes on the side frame in the short span and the middle frame in the long span are the largest and the largest change of moment appears on the middle frames in two directions from the quarter part to the end. The maximum vertical displacement occurs on the 1/4 area near the sliding hearing on the beam plane.

关 键 词：索形优化 双向张弦梁 静载试验 全跨均布活载 上弦钢梁 

分 类 号：TU394[建筑科学—结构工程]