传统风格建筑钢结构单梁柱中节点和双梁柱中节点试验研究及有限元参数分析
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摘要
为研究传统风格建筑钢结构节点的抗震性能以及各设计参数对节点受力的影响,设计制作了缩尺比例为1∶2.6的1个传统风格建筑钢结构单梁柱中节点SBJ-1和1个传统风格建筑钢结构双梁柱中节点DBJ-1,并对其进行了动力加载试验,根据试件破坏过程以及试验所得的滞回曲线和骨架曲线,分析节点的破坏模式、受力特点,并对SBJ-1试件和DBJ-1试件的抗震性能进行对比。试验结果表明:节点的屈曲变形都集中于梁端,试件最终破坏缘于梁端塑性铰区的母材撕裂,DBJ-1试件的刚度和承载能力要显著高于SBJ-1试件。在动力荷载作用下,试件达到极限点后的承载能力降低速度较快,强度衰减和刚度退化速度较快。在试验的基础上,使用ABAQUS有限元分析软件对节点进行了模拟,验证了有限元模型的有效性,通过改变试件轴压比、箱型梁壁厚以及上、下梁间距对节点进行参数分析,结果显示:轴压比越大,试件的刚度和承载能力越低,但影响有限;增大箱型梁的厚度能够显著提高试件的刚度和承载能力;改变双梁柱节点的上、下梁间距时其受力性能影响极小。
In order to study the seismic behavior of the joint in steel traditional style building and the influence of different design parameters on the mechanical properties of joint,a single beam-column joint( SBJ-1) and a double beam-column joint( DBJ-1) with a scale of 1∶ 2. 6 were made and conducted under dynamic loading. According to the failure process and the hysteresis curves and skeleton curves obtained from the test,the failure mode and stress characteristics of the joints were analyzed,and the seismic performance of the specimen SBJ-1 and the specimen DBJ-1 were compared. The tests showed that the buckling deformation of the joint was concentrated in the plastic hinge area of the beam,and the ultimate failure of the specimen was due to the tearing of the steel in the region; the stiffness and bearing capacity of the specimen DBJ-1 were significantly higher than those of the specimen SBJ-1.Under the dynamic loading,the bearing capacity of the specimens reduced faster after reaching the limit point,and the strength degradation and stiffness degradation speed were fast. On the basis of the experiment,ABAQUS finite element analysis software was used to simulate the joints and verified the validity of the finite element model. Then the axial pressure ratio,thickness of box girder,spacing of the upper beam and lower beam were changed for parameter analysis. The results showed that the stiffness and bearing capacity of the specimens decreased with the increase of axial compression ratio,but the influence was limited. The increase of beam thickness could improve the stiffness of the specimens and the bearing capacity of joints. There was little influence on the mechanical properties of specimens when the spacing of the upper and lower beam was changed.
In order to study the seismic behavior of the joint in steel traditional style building and the influence of different design parameters on the mechanical properties of joint,a single beam-column joint( SBJ-1) and a double beam-column joint( DBJ-1) with a scale of 1∶ 2. 6 were made and conducted under dynamic loading. According to the failure process and the hysteresis curves and skeleton curves obtained from the test,the failure mode and stress characteristics of the joints were analyzed,and the seismic performance of the specimen SBJ-1 and the specimen DBJ-1 were compared. The tests showed that the buckling deformation of the joint was concentrated in the plastic hinge area of the beam,and the ultimate failure of the specimen was due to the tearing of the steel in the region; the stiffness and bearing capacity of the specimen DBJ-1 were significantly higher than those of the specimen SBJ-1.Under the dynamic loading,the bearing capacity of the specimens reduced faster after reaching the limit point,and the strength degradation and stiffness degradation speed were fast. On the basis of the experiment,ABAQUS finite element analysis software was used to simulate the joints and verified the validity of the finite element model. Then the axial pressure ratio,thickness of box girder,spacing of the upper beam and lower beam were changed for parameter analysis. The results showed that the stiffness and bearing capacity of the specimens decreased with the increase of axial compression ratio,but the influence was limited. The increase of beam thickness could improve the stiffness of the specimens and the bearing capacity of joints. There was little influence on the mechanical properties of specimens when the spacing of the upper and lower beam was changed.
引文
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[3]薛建阳,翟磊,马林林,等.钢结构仿古建筑带斗棋檐柱抗震性能试验研究及有限元分析[J].土木工程学报,2016,49(7):57-67.
[4]谢启芳,李朋,葛鸿鹏,等.传统风格钢筋混凝土梁-柱节点抗震性能试验研究[J].世界地震工程,2015,31(4):150-158.
[5]谢启芳,李朋,王龙,等.传统风格钢筋混凝土梁-柱节点抗剪机理分析与抗剪承载力计算[J].建筑结构,2014,44(19):81-86.
[6]谢启芳,李朋,崔雅珍,等.基于ABAQUS的传统风格建筑钢筋混凝土梁-柱节点有限元分析[J].世界地震工程,2016,32(1):245-253.
[7]李诫.营造法式[M].上海:商务印书馆,1932.
[8]刘伟庆,葛卫,陆伟东.消能支撑-方钢管混凝土框架结构抗震性能的试验研究[J].地震工程与工程振动,2004,24(4):106-109.
[9]付荣,傅荣华,付安生.基于快速傅里叶变换的地震波加速度构成及其幅频特性研究[J].地震学报,2014,36(3):417-424.
[10]高卫欣.仿古建筑方钢管柱与圆钢管柱连接抗震性能试验及ABAQUS有限元分析[D].西安:西安建筑科技大学,2015.