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高强钢组合偏心支撑钢框架是耗能梁段采用屈服点较低的钢材、钢框架采用高强钢的新型双重抗侧力体系。为研究不同钢材对抗震性能的影响,在试验的基础上对5种K形组合偏心支撑钢框架的抗震性能进行非线性有限元分析。对有限元模型进行分析时仅改变钢材的强度等级,构件截面和边界约束条件与试验则完全一致,同时考率几何非线性和材料非线性。通过对各试件耗能机理、应力分布以及塑性铰力学模型的分析表明,在耗能梁段相同的条件下,适当提高框架钢材强度等级可以抵抗耗能梁段应变硬化产生的内力增大效应,从而避免因增大截面导致的用钢量上升;此时结构的延性虽有所下降,但刚度退化速率减缓,钢框架残余变形小,有利于震后修复。
High-strength steel combination of eccentric support steel frame is the energy beam section with lower yield point of steel, steel frame using high-strength steel a new double anti-lateral force system. In order to study the influence of different steel materials on the seismic performance, the nonlinear finite element analysis of the seismic performance of five kinds of K-shaped composite eccentric support steel frame is carried out on the basis of the experiment. When analyzing the finite element model, only the strength grade of steel is changed, and the cross-section and boundary conditions of the member are exactly the same as those of the test. The geometrical nonlinearity and non-linearity of the material are also tested. Through the analysis of energy dissipation mechanism, stress distribution and plastic hinge mechanics model of each specimen, it is shown that increasing the strength grade of frame steel under the same condition of energy dissipation beam can resist the increase of internal force caused by strain hardening of energy dissipation beam So as to avoid the increase of the amount of steel caused by the increase of cross section. At this time, although the ductility of the structure decreases, the rate of stiffness degradation slows down and the residual deformation of the steel frame is small, which is good for post-earthquake repair.