钢管混凝土柱-软钢板组合高墩受压性能试验  

An experimental investigation on the compression performance ofcomposite tall pier with CFST column-LYP steel plate

作　　者：蔡哲罕 卓卫东[1,2] 林楷奇 王志坚 刘秋江 CAI Zhehan;ZHUO Weidong;LIN Kaiqi;WANG Zhijian;LIU Qiujiang(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou 350108,China;Fujian Communications Planning&Design Institute Co.,LTD.,Fuzhou 350043,China;College of Science and Engineering,Open University of Fujian,Fuzhou 350003,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省土木工程多灾害防治重点实验室,福建福州350108 [3]福建省交通规划设计院有限公司,福建福州350043 [4]福建开放大学理工学院,福建福州350003

出　　处：《哈尔滨工程大学学报》2024年第3期561-571,共11页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51878180);福建省交通运输科技发展计划项目(201803);福州大学贵重仪器设备开放测试基金资助项目(2020T038);福建省土木工程多灾害防治重点实验室资助项目(MPPC-202100X);福建省中青年教师教育科研项目(JAT231203)。

摘　　要：为改善传统钢筋混凝土高墩桥梁的抗震性能,基于能力设计原理和结构抗震韧性设计理念,本文提出一种可更换部件的四肢钢管混凝土柱-软钢板组合箱形截面高墩。本文设计制作了1/10比例的缩尺试件,通过轴心和偏心受压试验,研究荷载偏心率、软钢板厚度等对新型组合高墩受压性能的影响。试验结果表明:新型组合高墩试件在轴压作用下,四肢钢管混凝土柱基本整体协调变形;当加载至试件破坏时,四肢钢管及软钢板均早已受压屈服,钢管套箍作用充分发挥;破坏形态呈整体弯曲失稳。在受偏心压力作用且偏心率不超过0.405时,四肢钢管混凝土柱全截面受压,组合截面纵向应变分布在弹性阶段基本满足“平截面假定”,在弹塑性阶段近似满足“拟平截面假定”;当加载至试件破坏时,破坏形态亦呈整体弯曲失稳。此外,钢系梁受力较小,仅起构造作用;而增大软钢板厚度,可有效提高新型组合高墩的截面抗弯刚度和正截面受压承载力,降低其侧向挠度;故在计算新型组合高墩的受压承载力时,应充分考虑软钢板的“结构元件”作用。Based on the capability design principle and design concept of earthquake-resilient structure,this paper proposes a box-section high pier composed of four-limb concrete-filled steel tubular(CFST)columns and low yield point(LYP)steel plates as replaceable components,thus improving the seismic performance of a bridge comprising conventional RC tall piers.A set of 1/10 scale specimens were designed and manufactured.Then,to investigate the effects of the eccentricity ratio of load and the thickness of the LYP steel plate on the compression performance of the proposed composite tall pier,axial and eccentric compression tests were conducted.The test results demonstrated that under axial compression,the four-limb CFST columns worked collaboratively well.In particular,the compression became increasingly larger until the specimen was broken and the test was terminated,after which the four-limb tube-LYP steel plates yielded,and the confinement of steel tube ferrule to the concrete core took full effect.Furthermore,the specimen exhibited compression-bending failure.When the loading eccentricity ratio was less than 0.405,the four-limb CFST columns were in full section compression.The longitudinal strains of the composite section basically met the“assumption of plane-section”and“assumption of quasi-plane-section”at the elastic and elastic-plastic stages,respectively.The specimens also exhibited global press-bending failure as the tests were terminated.Furthermore,the stresses of steel beams were small and only played a role in tectonism.Finally,increasing the thickness of LYP steel plates enhanced the bending stiffness and compressive bearing capacity while reducing the lateral deflection.Therefore,the effects of the“bearing components”should be considered in the computation of the compressive capacity.

关 键 词：桥梁工程 受压性能 轴压试验 组合高墩 可更换构件 软钢板 拟平截面假定 钢管混凝土柱 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]