The Effect Of Joint Stiffness On The Static And Dynamic Behavior Of Warren SHS Truss

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.