Study On Seismic Behavior Of I-section Beam-to-column Minor Axis Connection And Steel Beam To Steel Tubular Column Connection With Through Diaphragm

Damage of steel structure nodes is main form of building steel structure damage in earthquake, so the seismic performance of steel structure nodes has been a hotspot in research of engineering. The common form of connection is I-section beam-to-column minor axis connection and steel beam to steel tubular column connection with through diaphragm, and they have their respective applicable mechanics characteristics. The present commonly used specifications have no special provisions about this kinds of nodes, and the related research results is not perfect. For this purpose, this paper uses the numerical method to do systemic research on the seismic performance of the two kinds of steel nodes. The main work is as follows:1. Giving brief analysis of the characteristics of two kinds of nodes, the related norms about the node domain and the present domestic and foreign research situation and existing problems.2. Expounding the basic theory of nonlinear finite element, using ANSYS software to establish the finite element model of beam-column node, and through the contrast analysis between the numerical results and experimental results, verifying the applicability of the finite element model.3. In terms of I-section beam-to-column minor axis connection:(1) Using ANSYS software to simulate this node, loading on the model in one way and cyclic way, then analyzing the its mechanical properties through one-way load displacement curve and hysteretic curve.(2) Changing the three parameters axial, compression ratio, the connection plate length, and the column section height. According to the result of ductility coefficient and energy consumption index, analyzing the influence law on seismic performance of the node by these parameters and summing up the optimization of the seismic performance of the node corresponding to the scope of the above parameters. Then the related formula of the overhang length are obtained(3) Aiming at the phenomemon that the weak shaft connected node often uses welding steel plate to enhance the bearing capacity of weld. According to the current seismic code formula and the actual design application requirements of seismic bearing capacity of weld, changing the material, the connection plate length, and its thickness, and summing up the discriminant formula that the weak axis connecting node does not need to add welding steel plate to intensify the bearing capacity of weld, and the specific design proposal is given.4. In terms of steel beam to steel tubular column connections with through diaphragms:(1) Using ANSYS software to simulate and model this kind of node, loading on the model in one way and cyclic way, then analyzing the its mechanical properties through one-way load displacement curve and hysteretic curve.(2) Assuming the inner elongation in the baffle plate is constant, changing the axial compression ratio, outside clapboard length, and external diameter, et all,according to the corresponding seismic performance indicators, analyzing the effect of these parameters on seismic performance of the node, it is concluded that design Suggestions of outside clapboard length...