新型外包钢—混凝土组合梁扭矩计算  

Torsion calculation for the new type of steel-encased concrete composite beams

作　　者：赵静[1] 蔡建林[2] 

机构地区：[1]淮阴工学院建筑工程系,江苏淮安223001 [2]江苏大学土木工程系,江苏镇江212013

出　　处：《四川建筑科学研究》2010年第5期58-61,共4页Sichuan Building Science

基　　金：江苏省自然科学基金(BK2004064);江苏省建设厅科研项目(JS20032)

摘　　要：在对5根新型外包钢—混凝土组合梁进行了纯扭和复合受扭试验的基础上,研究了这种新型组合梁在纯扭和复合受扭作用下的破坏形态、工作机理以及裂缝发展分布的情况,比较分析了新型外包钢—混凝土组合梁的扭矩—扭率、荷载—应变、弯矩—挠度、荷载—裂缝之间的相互关系。通过对组合梁受扭性能的弹塑性理论分析,提出了组合梁纯扭及复合受扭作用下开裂扭矩的计算公式;采用变角空间桁架模型,提出了该新型组合梁在纯扭及复合受扭作用下的极限扭矩计算公式,理论公式计算结果与试验结果吻合良好。为评估结构的安全稳定性提供了依据,丰富了组合梁受扭性能的研究方法和内容。On the basis of experiments of five new type of steel-encased concrete composite beams,we studied this new steel-encased concrete composite beam＇s destruction shape,worked mechanism and the crack development and the distributed situation under pure torsion and combine torsion,and also compared and analyses composite beam＇s relationships of torsion-torsion ratio,load-strain,span bending-deflection and crack development with load. On the basis of elasticity plastic theory,the formula about cracking torsion of pure torsion and combined torsion are presented; and using spatial truss model with variable angle,formulas for ultimate torsion strength of pure torsion and combined torsion are proposed,the predicted results are in good agreement with measured ones. So attain a purpose of provide basis for valuation safety and stability of the structural ,abundant research methods and contents of pure torsion and combine torsion behaviors of concrete composite beams.

关 键 词：新型外包钢混凝土组合梁 纯扭 复合受扭 开裂扭矩 极限扭矩 

分 类 号：TU375.1[建筑科学—结构工程]