梅江会展中心张弦桁架抗连续倒塌分析

发布时间：2018-02-20 17:04

本文关键词： 张弦结构纵向联系桁架数值分析连续倒塌关键构件设计方法　出处：《建筑结构学报》2013年03期 　论文类型：期刊论文

【摘要】：通过对天津梅江会展中心张弦桁架移除关键构件后的残余结构的承载力分析,得到张弦结构的支座、边索和边跨桁架支座处下弦杆等关键构件的破坏对结构承载力影响最大;为了模拟杆件失效前静力荷载产生的初始变形对结构连续倒塌的影响,采用考虑初始变形的全动力等效荷载瞬时卸载法模拟杆件失效。对支座、边索和边跨桁架支座处下弦杆失效进行连续倒塌动力分析,研究了纵向联系桁架对张弦结构抗连续倒塌的作用,得到平面张弦桁架通过纵向联系桁架组装成一整体,其整体性随着纵向联系构件抗弯刚度的增大而提高,共同作用效果明显。在此基础上,利用山墙的抗风柱,将边跨张弦桁架改变为多支点支承的普通桁架,设计时该抗风柱不仅承担水平风荷载,还承担竖向荷载,从而提高结构的抗连续倒塌能力。并根据该工程的特点提出集桁架支座、张拉端(锚固端)和桁架下弦管于一体的铸钢节点构造,不仅满足建筑要求,还使得该处节点承载力大大加强,可供相关工程参考。
[Abstract]:Based on the analysis of the bearing capacity of the residual structure of Zhang Xian truss of Tianjin Meijiang Convention and Exhibition Center after removing the key members, it is concluded that the failure of the supporting, the side cable and the lower chord of the edge span truss bearing have the greatest influence on the bearing capacity of the structure. In order to simulate the effect of the initial deformation caused by static load on the continuous collapse of the structure before the failure of the member, the full dynamic equivalent load instantaneous unloading method considering the initial deformation was used to simulate the failure of the member. The continuous collapse dynamic analysis of string failure at the side cable and side span truss support is carried out, and the effect of longitudinal connection truss on the continuous collapse of Zhang Xian structure is studied. It is obtained that the planar Zhang Xian truss is assembled into a whole by longitudinal connection truss. With the increase of flexural stiffness of longitudinal connection members, its integrity is improved, and the joint effect is obvious. On this basis, the side span Zhang Xian truss is changed into a common truss supported by multiple supports by using the wind resistant column of the gable wall. In the design, the anti-wind column bears not only horizontal wind load but also vertical load, so as to improve the continuous collapse resistance of the structure. According to the characteristics of the project, a truss bearing is proposed. The construction of cast steel joint with tension end (anchor end) and truss lower chord tube can not only meet the requirements of construction, but also strengthen the bearing capacity of the joint, which can be used as a reference for relevant projects.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;中冶建筑研究总院有限公司;
【基金】：国家自然科学基金项目(50478075)
【分类号】：TU393.3;TU312

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