Fatigue Analysis of Beam-Column Node of High-rise Steel Frame Based on Multiple Scale
Pan Cunrui;Feng Liqiang;
High-rise steel structure beam-column node will cause the low-cycle fatigue failure under the influence of earthquake alternating reciprocating load and then lead to the collapse of structure. Therefore,in order to guarantee the steel structure beam-column node not causing the fatigue damage, it is necessary to analyze and study the fatigue characteristics of the beam-column node and the node domain. Firstly, the multi-node constraint method is used to establish the cantilever beam model and to verify the multi-scale modeling method. Secondly, the finite element model of a 12-floor steel frame beam system is established based on Ansys to master the rule of stress and strain distribution under earthquake action. On this basis, the multi-scale modeling method is used to establish the multi-scale finite element model of this frame structure so as to analyze the rule of stress and strain distribution of steel structure beam and column in detail. Finally,the lifetime of local beam-column node is predictively analyzed by S-N curve. The results show that the stress distribution of steel frame beam-column node and the node domain is more centralized thereby to cause the local failure of beam-column node, and lead to the failure of the whole steel frame in the end. The fatigue problem of the beam-column node has to be considered in the future design.
【CateGory Index】： TU973.13