摘要
近年来,钢管约束钢筋混凝土(STRC)柱结构已成为组合结构研究热点之一。约束钢管在柱端断开能够充分发挥其对混凝土的约束效果,增强柱体承载力及抗震性能。然而,节点区域将变得相对薄弱,传统结构体系性能分析中多以节点为刚性域,不考虑节点本身的变形及受损对结构的影响,这将导致STRC柱结构分析及设计存在一定的安全隐患。本文在STRC框架结构中引入节点单元Joint2D来模拟节点的受荷变形全过程,对比分析了节点单元对抗震性能模拟结果的影响,评价了不同强节点系数结构的地震易损性和抗倒塌性能。结果表明,不考虑节点性能的分析结果过高地估计了结构性能,造成不满足规范限值要求的性能指标被分析为满足要求。《钢管约束混凝土结构技术标准》中一级抗震的强节点系数1.5在罕遇地震时将偏于不安全,为满足结构使用安全及抗倒塌能力,建议取强节点系数为1.7。
In recent years,steel tubed reinforced concrete(STRC) column structures have become one of the research hotspots in composite structures.The disconnection of the steel tube at the end of the column could fully exerts its confinement effect on core concrete,enhancing the bearing capacity and seismic performance of the column.However,the joint region will become relatively weak.When conducting structural performance analysis traditionally,joints are often regarded as rigid region,without considering the deformation and damage of the joints on the structure.This will cause certain safety hazards in the analysis and design of STRC column structures.This article utilizes the joint element Joint2D to simulate the entire process of joint deformation in the STRC frame structure,analyzes the influence of joint elements on seismic performance simulation results,as well as the seismic vulnerability evaluation and collapse resistance performance of structures with different strong joint coefficients.The results indicate that the analysis results without considering joint performance will overestimate the structural performance,resulting in performance indicators that do not meet the code limit requirements being analyzed as meeting the requirements.The strong joint coefficient 1.5 for the first level seismic resistance in the code Technical Standard for Steel Tube Confined Concrete Structures will tend to be unsafe in rare earthquakes.To meet the safety and collapse resistance of the structure,it is recommended to take a strong joint coefficient of 1.7.
作者
赵航
郑宣宣
张玉洁
李窍
陈黄健
ZHAO Hang;ZHENG Xuanxuan;ZHANG Yujie;LI Qiao;CHEN Huangjian(School of Civil Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China;Shandong Academy of Architectural Sciences Co.,Ltd.,Jinan 250000,China;China Construction First Group Corporation Limited,Beijing 100161,China)
出处
《甘肃科学学报》
2024年第6期30-36,共7页
Journal of Gansu Sciences
基金
陕西工业职业技术学院校级自然科学重点项目(2023YKZD-010)。
关键词
钢管约束钢筋混凝土柱框架
节点域单元
抗震性能
易损性
Steel tubed reinforced concrete column frame structure
Joint element
Seismic performance
Structure vulnerability
