摘要
上海铁路南站是上海西南地区的交通枢纽,其钢屋盖采用圆形平面,最大直径为275m,由径向布置的18根Y形主梁和位于中心的顶压环组成,并布置了主索和环索以提高屋盖的抗扭刚度。屋盖体系支承在内、外两圈共54根柱子上,其中外柱设有斜索以提高结构体系的抗侧刚度。大跨度空间结构的特殊风荷载、由温度变化产生的胀缩效应引起的侧向力、结构的整体稳定性以及复杂节点的受力特性成为主要的设计难点。文中介绍了针对上述问题进行的理论分析和试验研究。根据风洞试验的结果并考虑了结构在脉动风荷载作用下的动响应,得到了对应不同响应的等效风荷载;通过在外柱顶设置弹性支座,部分释放了由于温度变化产生的侧向力;通过对整个屋盖体系以及单根主梁分别进行非线性有限元分析,得到了结构的整体稳定系数;通过节点有限元计算,根据应力分布对节点构造进行设计优化,保证了重要节点的安全可靠。
The roof structure of the Shanghai South Railway Station is a circular spatial structure with a diameter of 275 m. Its design, analysis and experimental studies are presented in this paper. Wind tunnel experiment was performed and equivalent static wind loads based on the experimental data and random vibration theory were employed in the design. The large lateral thrust due to temperature variations is reduced by placing a spring support on top of the outer columns. Global stability coefficient of the roof, in terms of the ratio of ultimate load to the design load, is obtained from a nonlinear finite element analysis of the entire structure as well as individual main beams. Via FEM analysis, structural optimization was performed on the basis of stress distributions to insure the safety of the key connections.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第5期1-8,共8页
China Civil Engineering Journal
关键词
钢屋盖
工程设计
风洞试验
弹性支座
整体稳定
有限元分析
roof structure
design
wind tunnel experiment
spring support
global stability
FEM analysis
