Finite Element Parameter Analysis of Static Performance for Stainless-Steel Beam-Column Connections
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摘要: 通过对不锈钢结构梁柱栓焊节点承载力及刚度的研究,得到对节点承载力以及刚度较有影响的几何参数,以前期试验数据作为参考基础,利用ABAQUS软件对栓焊节点的3个主要几何参数进行抗弯承载性能及初始刚度参数分析。结果表明:随钢梁翼缘厚度增加,不锈钢结构梁柱栓焊节点承载力及初始刚度提高,且提高幅度较大;抗滑移系数对节点的初始刚度影响不大,刚进入塑性时节点刚度会随抗滑移系数的增大而增加,对节点静力性能影响也不大;构造孔类型的变化,对节点承载力和初始刚度影响不大,但是会减小翼缘板应力集中现象。采用狗骨头型节点,会使塑性铰外移,虽然增加了节点延性,但是会降低节点刚度和承载性能。建议通过增大不锈钢结构梁柱栓焊节点中工字型梁翼缘厚度及采用FEMA 350规范中构造孔型式的方式,以改善节点受力性能和应力集中现象。Abstract: To study the influence of geometric parameters on flexural capacity and stiffness of beam-column connections using stain-steel S31608 and get the key influence parameters, on the basis of test data, using the finite element analysis software ABAQUS, parameter analysis on three main geometrical parameters of flexural capacity and stiffness of stain-steel beam-column connections was conducted. The analysis results showed that when thickness of steel beam flange of bolted-welded beam-to-column joints in stainless steel structure increased, bearing capacity and initial stiffness of the joints increased with large amplitude; when slipping coefficient increased, bearing capacity and initial stiffness of the joints increased with small amplitude; when weld access hole changed, bearing capacity increased and initial stiffness increased with small amplitude, but could decrease stress concentrate phenomenon; when "Dog-bone" was used, the position of plastic hinge appearance would out-shift, but bearing capacity and initial stiffness decreased with large amplitude. Using the weld access hole of FEMA350 and increasing the flange thickness of I-shaped bars is a good way to improve the static behavior of stain-steel beam-column connections.
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Key words:
- stain-steel beam-column connections /
- flexural capacity /
- joint rigidity /
- FEM /
- parametric analysis
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