型钢高强混凝土约束柱耐火性能模拟研究  

Study on fire performance of steel reinforced high-strength concrete columns

作　　者：郑蝉蝉 王广勇 Zheng Chanchan;Wang Guangyong(China Academy of Building Research,Beijing 100013,China;Disaster Prevention Research Centery Ministry of Housing and Urban Rural Development,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013 [2]建设部防灾研究中心,北京100013

出　　处：《建筑科学》2020年第11期132-137,共6页Building Science

基　　金：国家重点研发计划项目(2018YFC0807600);国家自然科学基金项目(51278477);朝阳区高新技术产业发展引导资金项目(20190111230730002)

摘　　要：在考虑高强混凝土保护层爆裂的前提下,建立了高强混凝土柱的有限元模型,有限元模型的有效性得到了已有试验结果的验证。利用验证的有限元模型,详细考察了轴向约束刚度比、转动约束刚度比、荷载比、偏心率、截面尺寸和混凝土抗压强度对型钢高强混凝土约束柱受力、变形及破坏的影响规律,并和普通型钢混凝土约束柱的耐火性能进行对比。研究表明,当其他影响因素保持不变时,与普通型钢混凝土约束柱不同,荷载比、偏心率和截面尺寸对型钢高强混凝土约束柱耐火性能的影响较大;轴向约束刚度比、转动约束刚度比和混凝土强度对型钢高强混凝土约束柱耐火性能的影响较小。The finite element model of high strength concrete column is established under the precondition of high strength concrete cover bursting.The validity of finite element model is verified by experimental results.By using the finite element model,the effects of axial restraint stiffness ratio,rotational restraint stiffness ratio,load ratio,eccentricity ratio,section size and compressive strength of concrete on the force,deformation and failure of steel reinforced concrete restained columns are investigated in detail,and compared with the fire resistance of restrained steel reinforced concrete columns.The study shows that:when other influencing factors remain unchanged,different from steel-concrete restrained columns,the load ratio,eccentricity and cross-section size have great influence on the steel reinforced high-strength concrete restrained columns fire resistance;the axial constraint stiffness ratio,rotational constraint stiffness ratio and concrete strength have less influence on the steel reinforced high-strength concrete restrained columns fire resistance.

关 键 词：高强混凝土 约束柱 耐火性能 

分 类 号：TU37[建筑科学—结构工程] TU352.5