摘要
由于高轴压比下方形钢管混凝土柱在地震荷载作用下存在钢管易发生屈曲、对核心混凝土的约束效果较差等缺点,故有必要采取柱内置拉杆约束的构造措施以提高柱的抗震性能。利用有限元仿真分析软件建立内置拉杆约束钢管混凝土柱的实体模型,在与拟静力试验结果吻合较好的基础上,进一步建立135个该类柱的足尺算例模型。考察有无拉杆、拉杆水平间距、拉杆布置高度、轴压比等关键参数对柱的抗震性能的影响,探讨内置拉杆约束对柱的塑性耗能机制的影响,提出了不同强度匹配下合理的拉杆水平间距、布置高度及其设计方法。结果显示:高轴压比下内置约束拉杆可显著提高柱的峰值承载力与破坏位移角,减小钢管的水平与纵向变形,降低钢管、核心混凝土的压应变峰值,提高柱的塑性耗能值,增大钢管耗能占比而减小核心混凝土的耗能占比,对拉杆耗能影响较小;给出了不同轴压比下柱端带拉杆的设计建议,可为实际工程中内置拉杆约束方钢管混凝土柱的设计和加固构造措施提供参考和依据。
Square steel tube concrete columns at a high axial compression ratio have the disadvantages of easy buckling of steel tubes and poor restraint effect on core concrete under seismic loads,it is necessary to take structural measures of built-in tie rods to improve the seismic performance of columns.The solid model of steel tube concrete columns with built-in tie rods is established by the finite element simulation analysis software.On the basis of good agreement with the results by quasi-static tests,a full-scale calculation model of 135 such columns is further established.The influence of key parameters such as the presence or absence of tie rods,tie rod horizontal spacing,tie rod arrangement height,and axial compression ratio on the seismic performance of columns is investigated,with the influence of built-in tie rod constraints on the plastic energy dissipation mechanism of columns discussed.The reasonable tie rod horizontal spacing,arrangement height and design method for different strength matchings are proposed.The results show that:at high axial compression ratio,built-in restrained rods can significantly improve the peak bearing capacity and failure displacement angle of the column,reduce the horizontal and longitudinal deformation of the steel tube and the compressive strain peak of the steel tube and core concrete,increase the plastic energy dissipation value of the column and the energy consumption proportion of the steel tube and reduce the energy consumption proportion of the core concrete,and have little effect on the energy consumption of the rod;design suggestions for column ends with rods at different axial compression ratios are given,which can provide reference and basis for the design and reinforcement construction measures of square steel tube concrete columns restrained by built-in rods in actual engineering.
作者
肖冲
吕辉
罗靓
XIAO Chong;L Hui;LUO Liang(Architectural Engineering Institute,Nanchang Institute of Technology,Nanchang 330044,China;College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Key Laboratory of Prefabricated Building and Intelligent Construction,Nanchang 330063,China)
出处
《西安理工大学学报》
北大核心
2025年第2期290-300,共11页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(52268031)
江西省智慧建筑工程研究中心开放基金项目(HK20231011)
南昌航空大学博士启动基金项目(EA201911291)。
关键词
内置拉杆约束
方钢管混凝土柱
滞回性能
应力-应变
塑性耗能
设计方法
constrained by internal binding bars
square steel tube concrete column
hysteresis performance
stress-strain
plastic energy consumption
design method
