摘要
对配有纵向钢筋和箍筋的矩形混凝土柱,采用预应力角钢板进行加固,使加固后的混凝土柱在不遭受加固破损的情况下,其承载力得到提高。在统一强度理论的基础上,对预应力角钢板加固混凝土短柱在轴心受压时的受力性能进行了分析,考虑了角钢板和箍筋对混凝土的约束作用,推导出了预应力角钢板加固混凝土短柱的轴压承载力计算公式。分析计算了原柱的极限承载力、加固柱在施加周向预应力使原柱内的箍筋不受力时和施加周向预应力使角钢板达屈服强度时的承载力。结果表明,统一强度理论对于预应力角钢板加固的配筋混凝土轴压短柱的理论计算有非常好的适用性。研究可为预应力角钢板加固混凝土短柱的轴压承载力的分析计算提供理论依据。
The rectangular concrete column with longitudinal reinforcements and stirrups was strengthened by pre-stressed angle steel plate in order to increase the column＇s bearing capacity under the condition of no strengthening damage. Based on unified strength theory,the axial compression performances of concrete short column strengthened with pre-stressed angle steel plate were analyzed. Considering the constraint function of angle steel plate and the stirrup for the concrete,the formula of axial compressive bearing capacity of concrete short column strengthened with pre-stressed angle steel plate was derived. The ultimate bearing capacity of the original column,the bearing capacity of the strengthened column when the ring tendons were applied in the original column to make the hoop in the original column unloaded,and the bearing capacity of the column with the angle plate reaching yielding bearing capacity by applying the circular pre-stress. The results show that the unified strength theory is very suitable for the theoretical calculation of concrete short column strengthened with prestressed angle steel plate under axial compression. This study provides a theoretical basis for the analysis and calculation of the axial compressive bearing capacity of concrete short column strengthened with pre-stressed angle steel plate.
作者
任振华
曾宪桃
屈文俊
梁桥
Ren Zhenhua;Zeng Xiantao;Qu Wenjun;Liang Qiao(School of Civil Engineering,Hunan Institute of Engineering,Xiangtan 411104,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构》
CSCD
北大核心
2018年第14期84-89,93,共7页
Building Structure
基金
国家自然科学基金项目(51478346)
湖南省自然科学基金(2017JJ4016)
湖南省自然科学基金项目(2018JJ4042)
湖南省教育厅重点项目(16A050)
关键词
预应力
统一强度理论
角钢板
混凝土短柱
轴压承载力
pre-stress
unified strength theory
angle steel plate
concrete short column
axial compressive bearing capacity
