摘要
上海中心大厦主体结构采用巨型框架-伸臂-核心筒结构体系,节点设计是巨型框架设计中的关键环节。介绍了基于性能的节点设计原则,研究了伸臂桁架与巨型柱连接节点、环带桁架螺栓拼接节点两类典型节点。伸臂桁架与巨型柱连接节点,节点区受力复杂,同时承受较大的轴力与弯矩,运用有限元方法对该类节点简化设计公式的适用性进行了验证。研究表明:简化设计公式能够满足工程精度要求,可作为该类节点初步估算的验算公式;环带桁架螺栓节点具有螺栓拼接长度超长、螺栓数量多、构件截面大及拼接板材厚度大的特点,运用有限元方法研究了该类节点的传力机理,并对螺栓拼接节点的安全性进行了考察。研究表明:该类节点满足指定性能需求下的承载力设计要求,螺栓传力呈现两端大,中间小的受力性态,但随荷载的增加螺栓传力不均匀性呈降低趋势;同时研究还表明,螺栓拼接长度较长会改变构件的力学特性。
The Shanghai Tower adopts the lateral resisting system of mega frame-core-outrigger structure.Joints design is the key phase during design procedure of the mega frame.Firstly,the principles of the performance-based design of joints were introduced briefly.Secondly,the design of two typical joint of the mega frame,the joint of outrigger to super-column and the long bolt joint of the belt truss,were checked.The joint of outrigger to super-column bears bending moment and axial force,the stress state of which was very complicated.The reasonableness of simplified formula was verified by using finite element analysis.The results show that the simplified formula meets the project requirements and can be accepted as a check formula in the preliminary design.The long bolt joint of the belt truss which has a super-long length includes a large quantity of bolts,thick splice plates and thick member sections.According to finite element analysis,the performance and mechanical behavior of the joint are revealed and its reliability is verified too.The results show that the bolt joint has enough capacity under specific performance requirements.Terminal bolts transfer more force and intermediate bolts transfer little.With the increasing of loads,the nonhomogeneity of transfer force of bolts reduces.The mechanical property of members will be changed as the bolt joint has large length.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2011年第7期31-39,共9页
Journal of Building Structures
作者简介
作者简介：丁洁民（1957-），男，江苏泰兴人，工学博士，教授。E—mail：djm@tjadri．com通讯作者：李久鹏（1982-），男，河北沧州人，博士研究生。E-mail：lijp317@163．com.
