斗栱对钢结构仿古建筑檐柱抗震性能的影响分析
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摘要
为研究斗栱对钢结构仿古建筑檐柱力学性能的影响,对8个缩尺比为1∶1. 5的钢结构仿古建筑檐柱进行了低周反复荷载试验,在获得各试件荷载-位移滞回曲线及骨架曲线的基础上,对其刚度退化、强度衰减、延性性能及耗能能力进行了研究,并对其破坏机理进行了分析。分析结果表明:斗栱改变了钢结构仿古建筑檐柱的传力机理,对其抗震性能也有较大影响;斗栱使钢结构仿古建筑檐柱的屈服承载力和极限承载力分别提高了30. 7%、24. 0%,使其屈服点和极限点处刚度分别提高了52. 8%、135. 6%;带斗栱檐柱屈服点处的耗能能力明显高于普通檐柱,但其延性略有降低(平均降低8. 5%)。在试验研究的基础上,基于ABAQUS建立了仿古建筑檐柱三维数值模型结构,对其进行参数分析,研究栌斗厚宽比对其抗震性能的影响。分析结果表明:在一定范围内,随栌斗厚宽比的增大,钢结构仿古建筑带斗栱檐柱的位移延性有一定程度的降低,其刚度和承载力逐渐增大;但带斗栱檐柱刚度和承载力的增幅先增大后减小,当栌斗厚宽比介于0. 011~0. 015时,带斗栱檐柱刚度和承载力的增幅最大。
In order to investigate influences of brackets on mechanical performance of steel eave columns in an imitated ancient building,eight specimens of steel eave columns and brackets in an imitated ancient building with the scale of 1/1. 5 were tested under low-cyclic repeated loading. On base of obtaining load-displacement hysteresis loops and skeleton curves of specimens,their rigidity degradation,strength decay,ductility,energy-dissipating capacity and failure mechanism were analyzed. The results showed that brackets not only change steel eave columns ' force transfer mechanism,but also affect their aseismic performance significantly; their yield and ultimate force-bearing capacity increase by 30. 7% and 24. 0%,respectively; their rigidities at yield point and ultimate one increase by 52. 8% and135. 6%,respectively; the energy-dissipating capacity of eave columns with brackets at yield point is obviously higher than that of common eave columns,but the ductility of eaves column with brackets slightly decreases by average 8. 5%.The finite element model for eave columns in imitated ancient building was established with the software ABAQUS based on the test study. The parametric analysis for influences of the thickness-width ratio of Ludou on eave columns' aseismic performance was done. The results showed that with increase in the thickness-width ratio of Ludou within a certain range,the rigidity and strength of ease columns with brackets increase,while their displacement ductility decreases to a certain extent; the rigidity and force-bearing capacity of eave columns with brackets firstly increase and then decrease,when the thickness-width ratio of Ludou is within a range of 0. 011—0. 015,their rate of increase in the rigidity and force-bearing capacity is the maximum.
In order to investigate influences of brackets on mechanical performance of steel eave columns in an imitated ancient building,eight specimens of steel eave columns and brackets in an imitated ancient building with the scale of 1/1. 5 were tested under low-cyclic repeated loading. On base of obtaining load-displacement hysteresis loops and skeleton curves of specimens,their rigidity degradation,strength decay,ductility,energy-dissipating capacity and failure mechanism were analyzed. The results showed that brackets not only change steel eave columns ' force transfer mechanism,but also affect their aseismic performance significantly; their yield and ultimate force-bearing capacity increase by 30. 7% and 24. 0%,respectively; their rigidities at yield point and ultimate one increase by 52. 8% and135. 6%,respectively; the energy-dissipating capacity of eave columns with brackets at yield point is obviously higher than that of common eave columns,but the ductility of eaves column with brackets slightly decreases by average 8. 5%.The finite element model for eave columns in imitated ancient building was established with the software ABAQUS based on the test study. The parametric analysis for influences of the thickness-width ratio of Ludou on eave columns' aseismic performance was done. The results showed that with increase in the thickness-width ratio of Ludou within a certain range,the rigidity and strength of ease columns with brackets increase,while their displacement ductility decreases to a certain extent; the rigidity and force-bearing capacity of eave columns with brackets firstly increase and then decrease,when the thickness-width ratio of Ludou is within a range of 0. 011—0. 015,their rate of increase in the rigidity and force-bearing capacity is the maximum.
引文
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[2]LAN X,HUANG Y.Structural design of cold-formed stainless steel tubular X-and T-joints at elevated temperatures[J].Thin-Walled Structures,2016,108:270-279.
[3]MIRGHADERI S R,TORABIAN S,KESHAVARZI F.I-beam to box-column connection by a vertical plate passing through the column[J].Engineering Structures,2010,32(8):2034-2048.
[4]薛建阳,吴占景,隋龑,等.仿古建筑钢结构双梁-柱边节点试验研究[J].建筑结构学报,2015,36(3):80-89.XUE Jianyang,WU Zhanjing,SUI Yan,et al.Experimental study on seismic performance of steel double-beams column exterior joints in imitated ancient building[J].Journal of Building Structure,2015,36(3):80-89.
[5]薛建阳,吴占景,隋龑,等.仿古建筑钢结构双梁-柱中节点抗震性能试验研究及有限元分析[J].工程力学,2016,33(5):97-105.XUE Jianyang,WU Zhanjing,SUI Yan,et al.Experimental study and numerical analysis on seismic performance of steel double-beams-column interior-joints in traditional style building[J].Journal of Building Structure,2016,33(5):97-105.
[6]薛建阳,戚亮杰,隋龑,等.钢结构仿古建筑双梁-柱中节点的受力机理[J].土木建筑与环境工程,2016,38(1):17-22.XUE Jianyang,QI Liangjie,SUI Yan,et al.Mechanical performance of the double beam-column inner joints in steel imitated ancient building[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(1):17-22.
[7]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.XIE Qifang,LI Peng,WANG Long,et al.Shear mechanism analysis and shear capacity calculation of the RC columnbeam joint built in traditional style[J].Building Structure,2014,44(19):81-86.
[8]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.XIE Qifang,LI Peng,CUI Yazhen,et al.Finite element analysis of RC column-beam joint built in traditional style based on ABAQUS[J].Word Earthquake Engineering,2016,32(1):245-253.
[9]薛建阳,马辉,刘义.反复荷载下型钢再生混凝土柱抗震性能试验研究[J].土木工程学报,2014,47(1):36-46.XUE Jianyang,MA Hui,LIU Yi.Experimental study on seismic performance of steel reinforced recycled concrete columns under low-cyclic reversed loading[J].China Civil Engineering Journal,2014,47(1):36-46.
[10]胡宗波.钢结构箱型柱与梁异性节点性能试验与理论研究[D].西安:西安建筑科技大学,2010.
[11]薛建阳,刘祖强,彭修宁,等.大型火电厂主厂房钢结构异型节点抗震性能试验研究[J].建筑结构学报,2011,32(7):133-139.XUE Jianyang,LIU Zuqiang,PENG Xiuning,et al.Experimental study on seismic behavior of abnormal joints in large-scale power plant steel structures[J].Journal of Building Structures,2011,32(7):133-139.