圆钢管混凝土抗弯刚度研究  

Study on flexural stiffness of concrte-filled steel tubes w ith circular sections

作　　者：武斌[1,2] 谭卓英[1] 车媛 WU Bin;TAN Zhuoying;CHE Yuan(School of Civil and Environmental,University of Science and Technology Beijing,Beijing 100083,China;Department of Construction Engineering,Liaoning Provincial College of Communications,Shenyang 110122,China;Road and Bridge Engineering,Liaoning Provincial College of Communications,Shenyang 110122,China)

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]辽宁省交通高等专科学校建筑工程系,辽宁沈阳110122 [3]辽宁省交通高等专科学校道路与桥梁工程系,辽宁沈阳110122

出　　处：《混凝土》2018年第12期34-39,共6页Concrete

基　　金：国家自然科学基金(51174013);辽宁省自然科学基金(20170540493);辽宁省博士科研启动基金(20170520139);辽宁省交通高等专科学校校级课题(Lnccybky201701)

摘　　要：对4个圆钢管混凝土受弯构件进行了试验研究。结果表明:试件经历了3个变形阶段,弹性变形阶段、弹塑性变形阶段、塑性变形阶段。当跨中弯矩大于0.7M_u时,受拉区及受压区钢管进入屈服。试验结果还表明:抗弯刚度随弯矩的变化大致分为3个阶段:近水平线段、线性下降段、二次下降段。圆钢管混凝土受弯构件随着抗弯刚度的增加,曲率延性提高明显,变形能力提高显著,试件C159-00曲率延性系数比试件C89-00提高107.4%。圆钢管混凝土受弯构件具有较强的耗能能力及刚度退化能力,试件C159-00的抗弯刚度退化率达到73.2%,而试件C89-00的抗弯刚度退化率为50.3%;试件C159-00屈服点及极限点耗能与试件C89-00相应位置处耗能比值分别为3.08、6.90。推导出的圆钢管混凝土受弯构件的刚度计算式是一种动态的刚度求解方法,可以求解受力全过程的抗弯刚度值,并与国内外相关规范进行了对比分析。Four concrete filled circular steel tubular flexural members were experimentally studyed.The results show that the specimen has experienced three deformation stages,elastic deformation stage,elastic-plastic deformation stage and plastic deformation stage.When the bending moment is greater than times the ultimate bending moment,the tension and pressure steel pipe go into the yield zone.The experimental results also show that the flexural ductility of the concrete-filled steel tubular flexural members increases obviously with the increase of flexural stiffness,and the deformation capacity is improved obviously.The circular concrete-filled steel tubular flexural members have strong energy dissipation capacity and stiffness degradation ability.The stiffness calculation formula of the circular concrete-filled steel tubular flexural members is a dynamic stiffness method,and the bending stiffness values of the whole process can be solved and compared with the relevant design codes both at home and abroad.

关 键 词：圆钢管混凝土 受弯构件 初始抗弯刚度 使用阶段抗弯刚度 抗弯刚度 

分 类 号：TU528.01[建筑科学—建筑技术科学]