平缀管式等截面钢管混凝土格构柱抗震性能试验与有限元分析  

ASEISMIC PERFORMANCE TEST AND FEM ANALYSIS OF UNIFORM SECTIONAL CFST LATTICE COLUMN WITH FLAT LACING TUBES

作　　者：袁辉辉[1] 吴庆雄[1] 陈宝春[1] 吕银花[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《工程力学》2016年第10期226-235,共10页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51178118);教育部"新世纪优秀人才支持计划资助"项目(NCET-13-0737)

摘　　要：为研究低周反复荷载下平缀管式等截面钢管混凝土格构柱的抗震性能,进行共计7根试件的拟静力试验,重点考察不同柱肢混凝土强度、柱肢纵向间距、缀管竖向间距对此类构件刚度、强度和延性的影响。同时,基于Open Sees平台建立了采用纤维单元的有限元计算模型,对此类钢管混凝土格构柱试件的滞回性能进行数值模拟,模拟结果与试验数据吻合良好。通过对试件破坏过程、荷载位移滞回曲线和骨架曲线等结果的分析表明:钢管混凝土格构柱试件具有良好的抗震性能,破坏形态均以整体压弯破坏为主,得到的水平荷载-位移滞回曲线饱满无捏缩;柱肢混凝土强度主要影响格构柱的承载力,随着混凝土强度等级从C40增加到C60,试件的承载力提高了5.7%;柱肢纵向间距由250 mm加大到650 mm,试件的承载力和位移延性系数分别提高了14.5%和6.8%;缀管竖向间距由200 mm增加到313 mm,试件的承载力和位移延性系数分别降低了12.9%和12.0%。To study the aseismic performance of uniform sectional concrete-filled steel tubular （CFST） lattice columns with flat lacing tubes, the quasi-static tests are conducted for seven test specimens focused on the effects of different concrete strength, longitudinal spacing of CFST limbs, and vertical spacing of lacing tubes on stiffness, strength, and ductility. The hysteretic behaviors of specimens are also simulated with a fiber model using OpenSees platform, and the results obtained by fiber element model agree well with test results. By analyzing the damage modes, the load-displacement hysteretic loops, the skeleton curves, and the following conclusions can be derived. All the specimens have a good aseismic performance, characterized by the overall bending damage; and the horizontal load-displacement hysteresis curves are plump; with the increase of concrete strength from C40 to C60, the bearing capacity is improved by 5.7%; as the longitudinal spacing of CFST limbs increased from 250 mm to 650 mm, the bearing capacity and the ductility factor are significantly improved by 14.5% and 6.8%; as the vertical spacing of lacing tubes increased from 200 mm to 313 mm, the bearing capacity and the ductility factor are respectively reduced by 12.9% and 12.0%.

关 键 词：钢管混凝土格构柱 平缀管式 拟静力试验 有限元分析 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程]