螺栓球节点试验及在单层网壳结构中的应用性  

Experiment of bolt-ball joint and its application in single-layer reticulated shells

作　　者：曹正罡[1] 范峰[1] 马会环[1] 王伟[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2010年第4期525-530,共6页Journal of Harbin Institute of Technology

基　　金：中国博士后科学基金资助项目(20070420876);国家自然科学基金资助项目(50778054)

摘　　要：为充分利用螺栓球节点的抗弯刚度,实现其在单层网壳结构中的应用,针对螺栓球节点开展力学试验研究,配合以精细化的有限元分析,获得节点的抗弯性能,并采用弯矩-转角关系来描述.利用ANSYS程序,采用弹簧单元模拟节点弯曲与扭转性能并将试验获得的弯矩-转角关系引入节点属性中,构建了螺栓球节点单层网壳的有限元模型.在此基础上系统开展了网壳结构的稳定性能研究.结果显示:采用螺栓球节点的网壳对于荷载不对称分布较为敏感,而且失稳过程中总伴随有节点的弯折效应;单层球面网壳的极限承载力最低可达到对应刚性节点网壳的32%,最高则超过98%,而单层柱面网壳则仅为10%,这表明此类节点可以应用在单层球面网壳中,但不宜在单层柱面网壳中采用.The bolt-ball joint system with actual bend-bearing capacity can be used in single-layer reticulated domes.Both experimental study and sophisticated finite element analysis were carried out to obtain the bending capacity of the joint which was described by bending-rotation curves.The finite element model of a single-layer reticulated dome with bolt-ball joints was established by ANSYS,in which spring elements were used to simulate bending stiffness of the joint obtained experimentally.The stability of single-layer domes was analyzed.Results indicate that the single-layer dome with bolt-ball joints is sensible to asymmetry load distribution and its buckling is process always accompanied with bending of the joint.The critical load of a single-reticulated dome with bolt-ball joints is 32% as that of much as the rigid dome at least,and the percentage will be over 98% at most.But for a single-layer cylindrical reticulated dome,the percentage is only 10% ,indicating that the bolt-ball joint system can be used in single-layer reticulated domes,but should not be used in a single-layer cylindrical reticulated dome.

关 键 词：单层网壳 螺栓球 承载力 试验 

分 类 号：TU393.3[建筑科学—结构工程]