内置开孔板连接键的宽肢L形钢管混凝土组合柱抗震性能有限元参数化分析  

Finite Element Parametric Analysis of Seismic Performance of Wide-FlangeL-Shaped CFST Composite Columns with Built-in PBL

作　　者：熊清清[1,2,3] 桂海伟 张旺 李格[2] XIONG Qingqing;GUI Haiwei;ZHANG Wang;LI Ge(Department of Civil Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Dali Construstion Group Corporation Limited,Hangzhou,Zhejiang Province,Hangzhou 311215,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]石家庄铁道大学土木工程学院,石家庄050043 [3]大立建设集团有限公司,杭州311215

出　　处：《工业建筑》2023年第5期7-16,173,共11页Industrial Construction

基　　金：国家自然科学基金项目(52008270);河北省自然科学基金项目(E2020210003);河北省高等学校科学技术研究项目(QN2020409);河北省高等学校科学技术研究重点项目(ZD2022040)。

摘　　要：为研究内置PBL的宽肢L形钢管混凝土组合柱(W-LCFST柱)抗震性能,基于已有试验结果,对内置PBL的L形钢管混凝土组合柱进行了数值模拟,考虑了钢材延性断裂失效的影响,模型结果可以很好地预测启裂点位置、开裂路径及荷载-位移曲线等。进一步对PBL隔板数量、PBL孔间距、PBL孔径大小、边柱尺寸、轴压比和钢管厚度等参数开展了对比分析,结果表明:PBL隔板数量从2个增加至6个后,提高了对核心混凝土的约束作用,位移延性系数提高了14.5%;PBL孔径大小和孔间距仅对塑性阶段有影响,达到峰值荷载前,孔径51 mm的PBL隔板容易在不利位置破坏而引起W-LCFST柱承载力降低,达到峰值荷载后,孔径17 mm的PBL隔板内的混凝土榫更容易受剪破坏,承载力下降较快;轴压比在0.25~0.55范围内,W-LCFST柱承载力先提高后下降;增加边柱尺寸和钢管厚度可以提高初始刚度和峰值承载力,边柱尺寸由100 mm×100 mm增大至140 mm×100 mm时,初始刚度提高了13.7%,钢管厚度从6 mm提升至8 mm后,正向峰值承载力提升了21.8%。In order to study the seismic performance of the wide-flange L-shaped CFST composite column with built-in PBL(W-LCFST column),based on the existing test results,the numerical simulation of the L-shaped CFST composite column with built-in PBL was carried out,considering the ductile fracture failure of steel.The model results could well predict the location of the crack initiation point,the crack path and the load-displacement curve.Further comparison and analysis of parameters such as PBL separators quantity,PBL hole spacing,PBL hole size,side column size,axial compression ratio and steel pipe thickness were carried out.The results showed that when the number of PBL separators was increased from 2 to 6,the restraint effect on the core concrete was improved,and the displacement ductility coefficient was increased by 14.5%;the size of the PBL pore diameter and the spacing of the pores only affected the plastic stage.Before reaching the peak load,PBL partitions with a pore diameter of 51 mm were easily reduced in the unfavorable position and caused the W-LCFST pillar to be reduced.The concrete tenon in the PBL partition with a pore diameter of 17 mm was more likely to be cut and damaged,and the carrying capacity decreased rapidly;the axis pressure ratio was within the range of 0.25 to 0.55,and the bearing capacity of the W-LCFST column was increased first.The initial stiffness and the peak bearing capacity could be increased with the increase of the sizes of the edge column and the thickness of the steel pipe.When the peak bearing capacity,the sizes of the edge column increased from 100 mm×100 mm to 140 mm×100 mm,the initial stiffness increased by 13.7%.After the thickness of the steel pipe increased from 6 mm to 8 mm,the positive peak bearing capacity increased by 21.8%.

关 键 词：钢管混凝土组合柱 开孔钢板 抗震性能 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程] TU352.11