混凝土二次受力对叠合梁极限承载力的影响分析  

Analysis of the effect of secondary loads on ultimate bearing capacity of concrete composite beam

作　　者：朱德孙 盛宏玉[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2017年第4期528-532,共5页Journal of Hefei University of Technology：Natural Science

摘　　要：文章运用有限元软件ANSYS分别对一般整浇梁、普通叠合梁以及考虑混凝土二次受力的叠合梁进行数值模拟,通过降温法模拟现浇混凝土的收缩微应变,并在叠合面上建立弹簧单元;探讨了混凝土二次受力对叠合梁极限承载力的影响。数值结果表明,普通叠合梁相对于同条件下的一般整浇梁来说,能够提高其极限承载力,而考虑混凝土二次受力的叠合梁相对于普通叠合梁其极限承载力会有所降低,但仍比一般整浇梁的极限承载力高。最后模拟了叠合参数αh的变化对混凝土二次受力叠合梁承载力的影响。In this paper, the finite element software ANSYS is used to simulate the integral casting concrete beam, ordinary concrete composite beam and composite beam considering secondary load of concrete simulta- neously. The effect of secondary loads on the ultimate bearing capacity of concrete composite beam is analyzed based on the simulation of the micro-strain of cast-in-situ concrete using the temperature reduction method and the spring element established on the laminate surface. The numerical results show that the ultimate bearing capacity of the ordinary concrete composite beam is higher than that of the integral casting concrete beam, while the ultimate bearing capacity of the composite beam considering secondary load of concrete is a little lower than that of the ordinary concrete composite beam but still higher than that of the integral casting con- crete beam. Finally, the influence of different composite parameters ah on the ultimate bearing capacity of the composite beam considering secondary load of concrete is simulated.

关 键 词：极限承载力 ANSYS模拟 整浇梁 叠合梁 二次受力 叠合参数 

分 类 号：TU375.1[建筑科学—结构工程]