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对12个冷弯薄壁型钢方钢管梁柱焊接节点进行了低周往复加载试验及非线性有限元数值模拟分析,有限元分析中考虑双重非线性、初始几何缺陷及焊材的本构模型等因素的影响。将循环荷载下数值计算结果与试验结果进行对比,讨论了试件滞回曲线、极限承载力、节点域应力分布等方面的内容。分析结果表明:(1)数值模拟与试验结果较为接近,极限荷载及极限位移差值在10%以内,所采用的数值分析模型和数值方法可进行冷弯薄壁型钢梁柱节点的参数化分析。(2)改进后的加腋节点极限承载力比常规节点高,极限状态时梁端位移较小;节点的滞回曲线饱满,耗能能力较强。(3)分散焊缝改进型节点破坏前经过循环次数较多,耗能能力较强。(4)轴压比对滞回性能及节点域应力分布有一定影响。
Low-frequency reciprocating loading test and nonlinear finite element numerical simulation of 12 cold-formed thin-walled square steel beam and column welded joints were carried out. In the finite element analysis, double nonlinearity, initial geometric defects and constitutive model of welding consumables were considered The impact of factors. The numerical calculation results under cyclic loading are compared with the experimental results, and the contents of hysteresis curve, ultimate bearing capacity and stress distribution in the node domain are discussed. The results of the analysis show that: (1) The numerical simulation is close to the experimental results, and the difference between ultimate load and ultimate displacement is within 10%. The numerical analysis model and numerical method adopted can be used to parameterize the joints of cold-formed thin- analysis. (2) The ultimate bearing capacity of the improved axillary node is higher than that of the conventional node, and the displacement of the beam end is smaller when the limit state is reached. The hysteresis curve of the node is full and the energy dissipation capability is strong. (3) Dispersed weld joints improve the number of cycles before damage, energy-consuming ability. (4) The axial compression ratio has certain influence on the hysteretic behavior and the stress distribution in the node domain.