【作者】 沈冲；

【导师】 武振宇；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2007， 硕士

【摘要】 Warren钢管桁架是一种常见的桁架形式。目前,桁架设计基于理想铰接假定,而实际桁架在其节点处都有一定的刚度。本文利用有限元软件ANSYS分析节点刚度对桁架静动力性能的影响。首先,按照《钢结构设计规范》设计一榀直接焊接K型间隙方钢管Warren桁架。改变桁架杆件尺寸、节点间隙使其节点刚度发生变化。其次,建立壳元模型、理想铰接模型、理想刚接模型。并以micro-bar模型为基础对壳元模型进行简化,建立一系列模型:简化模型、考虑轴向弹簧杆元弹塑性的简化模型、考虑转动弹簧的模型、考虑轴向弹簧杆元弹塑性的micro-bar模型。最后,利用壳元模型静力计算的结果分析节点刚度对桁架静力性能的影响。用壳元模型与其他模型进行对比,分析出哪种模型与壳元模型吻合最好。本文还将单独节点与壳元整体模型中节点的静力性能进行了对比分析,得出一些结论。用壳元模型计算罕遇地震下的动力反应,并与简化模型进行对比。然后,用壳元模型、简化模型、考虑轴向弹簧杆元弹塑性的简化模型、理想刚接模型对考虑节点刚度后桁架的动力性能进行了探索性的研究。更多还原

【Abstract】 Warren truss is a sort of familiar steel tube structure. At present, the design of truss is on the basis of pin-joint assumption. But there is certain stiffness in actual truss joints. In this paper, the effect of joint stiffness on static and dynamical behavior of SHS-truss is studied by ANSYS.First, one warren truss with gapped K-type joints is designed according to the Code for design of steel structure. Then the member dimensions and joint gap dimensions are changed. The main purpose is to change the stiffness of joints.Second, shell truss model、pin-joint model、rigid-joint model are developed.On the basis of micro-bar model,a series of models are developed,such as simplified model、the simplified model considering the plasticity of spring-bar、model of considering the rotational spring、micro-bar model considering the plasticity of spring-bar.Finally, the effect of joint stiffness on static behavior of SHS-truss is analyzed by shell truss model.Comparing the results with other models, the model mostly agreeing with shell truss model is found out. In this paper, separate joints are developed to compare with the joints in shell truss model. Response of shell truss model under severe earthquake is carried out by ANSYS. Then the Response of truss under severe earthquake is calculated by simplified model.Using shell truss model、rigid-joint model、simplified model、the simplified model considering the plasticity of spring-bar, the effect of joint stiffness on dynamical behavior of SHS-truss is analyzed.更多还原