住宅钢结构梁翼缘材料削弱型节点的有限元分析
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摘要
提出一种利用低屈强比钢实现住宅钢结构节点梁翼缘削弱的新方法。采用非线性静动态有限元方法,分析和比较梁翼缘材料削弱前后节点的极限承载能力和滞回性能,研究梁翼缘削弱位置和削弱长度等对节点承载能力、塑性铰发生位置、节点抗震性能等的影响。分析表明:梁翼缘材料削弱会造成节点承载能力小幅度降低,并使节点局部应力重分布,实现塑性铰外移;梁翼缘削弱后,节点的滞回曲线更为饱满,节点耗能性能和延性性能增强;梁翼缘削弱位置和削弱长度的变化对节点承载能力和抗震性能都有一定影响,需要对削弱参数进行综合考虑。
A novel method is proposed to realize beam flange reduction in steel constructions with low yielding-strength ratio steel. By adopting the nonlinear static-dynamic finite element method, it is conducted analysis and comparison of the bearing capacity and hysteretic behavior in connection with or without a material-reduced beam section.The effects of the parameters, such as location and length of material-reduced beam flange, on the bearing capacity, plastic hinge position and seismic performance of the weakened flange are studied. The stress distribution in local regions is changed, while the bearing capacity decreases a little, so that external movement of the plastic hinge can be successfully realized. With material reducing beam flange, the hysteresis curve of the connection is better-shaped, and both the corresponding capacity of consuming energy and ductility are also improved. Comprehensive considerations of the reduction parameters are necessary because changes in location and length of material-reduced beam flange have a certain effect on the bearing capacity and aseismic behavior of the connections.
A novel method is proposed to realize beam flange reduction in steel constructions with low yielding-strength ratio steel. By adopting the nonlinear static-dynamic finite element method, it is conducted analysis and comparison of the bearing capacity and hysteretic behavior in connection with or without a material-reduced beam section.The effects of the parameters, such as location and length of material-reduced beam flange, on the bearing capacity, plastic hinge position and seismic performance of the weakened flange are studied. The stress distribution in local regions is changed, while the bearing capacity decreases a little, so that external movement of the plastic hinge can be successfully realized. With material reducing beam flange, the hysteresis curve of the connection is better-shaped, and both the corresponding capacity of consuming energy and ductility are also improved. Comprehensive considerations of the reduction parameters are necessary because changes in location and length of material-reduced beam flange have a certain effect on the bearing capacity and aseismic behavior of the connections.
引文
[1]罗晏斌,董事尔,史德刚.从汶川大地震看钢结构的发展[J].工业建筑,2009,39(S1):524-528.
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[8]茹继平,杨娜,杨庆山.翼缘削弱型钢框架梁柱节点的性能研究综述[J].工程力学,2004,21(1):61-66.
[9]毛辉,王燕.钢框架梁翼缘扩翼型节点受力性能研究[J].西安建筑科技大学学报:自然科学版,2010(1):36-41
[10]王燕,郁有升,王悦,等.钢框架翼缘削弱型和扩翼型节点受力性能研究[J].力学与实践,2010,32(1):45-53.
[2]王燕,李华军,厉见芬.半刚性梁柱节点连接的初始刚度和结构内力分析[J].工程力学,2003,20(6):65-69.
[3]孟嵬.钢结构梁柱节点设计的探讨[J].科技情报开发与经济,2007,17(13):285-286.
[4]Stephen A,Mahin.Lessons from Damage to Steel Buildings During the Northridge Earthquake[J].Engineering Structures,1998,20(4-6):261-270.
[5]Song Jianlin,Burce R,Ellingwood.Seismic Reliability of Special Moment Steel Frames with Welded Connection[J].Journal of Structural Engineering,1999,125(4):357-371.
[6]蔡益燕.考虑塑性铰外移的钢框架梁柱连接设计[J].建筑结构,2004,34(2):3-9.
[7]周群,王燕.狗骨式节点梁翼缘削弱深度的取值研究[J].钢结构,2007,22(8):14-16.
[8]茹继平,杨娜,杨庆山.翼缘削弱型钢框架梁柱节点的性能研究综述[J].工程力学,2004,21(1):61-66.
[9]毛辉,王燕.钢框架梁翼缘扩翼型节点受力性能研究[J].西安建筑科技大学学报:自然科学版,2010(1):36-41
[10]王燕,郁有升,王悦,等.钢框架翼缘削弱型和扩翼型节点受力性能研究[J].力学与实践,2010,32(1):45-53.
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