预应力钢-木组合圆形柱轴心受压力学性能研究  

Experimental Research on Mechanical Properties of Prestressed Steel-timber Circular Column Under Axial Compression

作　　者：王宇豪 刘德贵[1,2] 王宁 马京京[1] WANG Yuhao;LIU Degui;WANG Ning;MA Jingjing(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Sichuan,Mianyang 621010,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]工程材料与结构冲击振动四川省重点实验室,四川绵阳621010

出　　处：《工业建筑》2022年第1期39-46,共8页Industrial Construction

基　　金：四川省科技厅应用基础研究项目(2019YJ0437)。

摘　　要：为改善纯木柱承载力较低、易发生脆性破坏和延性较差等缺点,提出一种预应力钢-木组合圆形柱,并对这种构件进行了轴心受压试验,获得了各个试件的破坏形态、破坏模式、延性指标、荷载-位移曲线和荷载-应变曲线。结果表明,相较于薄壁钢筒和纯木柱极限荷载(P_(max))的总和,预应力钢-木组合圆形柱和CFRP布包裹预应力钢-木组合圆形柱分别提高了16.12%和24.49%;与纯木柱相比,延性指标(DI)分别提高了268.73%和340%。采用ABAQUS有限元分析软件建立了预应力钢-木组合圆形柱模型,并通过位移加载的方式得到了试件的荷载-位移曲线,与试验结果吻合良好。有限元分析结果表明,当环向预应力与钢材屈服强度的比值为0.1,0.2和0.3时,试件的P_(max)提升明显;当环向预应力达到钢材屈服强度的40%时,试件的P_(max)减小,但仍然大于未施加预应力的试件。约束效应系数λ随CFRP布的使用和预应力的增加而增加。In order to improve the low bearing capacity,brittle failure and poor ductility of timber columns,the pre-stressed steel-timber circular column was proposed.The axial compression tests were carried out on the components,and the failure forms,failure modes,ductility index,load-displacement curves and load-strain curves of each specimen were obtained.The results showed that compared with the sum of ultimate load(P_(max))of thin-walled steel cylinder and timber column,the ultimate load of the prestressed steel-timber circular column and the prestressed steel-timber circular column wrapped with CFRP increased by 16.12%and 24.49%respectively.Compared with the timber column,the ductility index(DI)increased by 268.73%and 340%respectively.The model of the prestressed steel-timber circular column was built by the finite element analysis software ABAQUS,and the load-displacement curve which was obtained by means of displacement loading was in good agreement with the test results.The finite elements analysis results showed that when the prestressing of lateral steel equalled 0.1,0.15 and 0.2 times of its tensile yield,the P_(max) increased obviously.The P_(max) would be reduced when the prestressing of lateral steel reached 0.25 times of its tensile yield,but it was still larger than the P_(max) of unstressed specimen.Confinement effect coefficientλincreased with the increase of pre-stressing of steel and use of CFRP sheets.

关 键 词：预应力钢-木组合柱 轴心受压 力学性能 有限元模拟 

分 类 号：TU398.6[建筑科学—结构工程]