摘要
介绍了13根钢管混凝土叠合柱短柱(长细比4.67)的偏心受压试验结果,研究结果表明:钢管混凝土叠合柱偏心受压短柱正截面的破坏类型分为大偏心和小偏心受压破坏两种,以受拉区钢筋达到屈服强度,同时混凝土受压边缘达到极限压应变为界限破坏准则,同时其N-M具有抛物线的相关关系;叠合柱横截面应变符合平截面分布,不论偏心距大小,受压钢筋屈服总是先于受压区混凝土压碎。与试验结果相比,现行规程大幅度(51%~77.4%)低估了叠合柱偏心受压承载力。基于试验采用截面极限平衡理论提出了叠合柱偏心受压短柱的正截面承载力公式,公式形式简单,与我国现行的规范体系相协调,计算结果与试验结果吻合良好。
The results of 13 steel tube-reinforced concrete columns( STRC) with a slenderness ratio of 4. 67 under eccentric compression loads are introduced. Test results show that failure modes are divided into two types,namely large and small eccentric failures whose demarcation failure criterion is that tensile bars reach yield strength and the concrete compressive edge reaches the ultimate compressive strain. Furthermore,the N-M curve of STRC shows parabolic correlation and the cross-section strain obeys the plane assumption. It also observed that compressive bars reach compressive strength prior to concrete crushed on the compressive zone no matter how much the eccentricity is. Compared to the test results,the bearing capacity of SRTC( 51% ~ 77. 4%) is underestimated greatly by current specification. Based on the experiments,equations to calculate the normal-section bearing capacity using limit equilibrium theory are proposed. The bearing capacity equations presented in this paper is simple and coordinates with the current specification. The calculated values agree well with the experimental results.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第5期56-63,共8页
China Civil Engineering Journal
基金
国家自然科学基金(50878013)
教育部博士点新教师基金(200800061008)
关键词
钢管混凝土叠合柱
偏心受压
试验
正截面承载力
steel tube-reinforced concrete columns
eccentric compression
experiment
normal-section bearing capacity
