试验研究钢筋混凝土薄板受拉刚化效应  

Tension stiffening in reinforced concrete slabs and test research

作　　者：姜磊[1] 姚继涛[1,2] 信任[1] 李桅[1] 吕甲朋[3] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西部建筑科技国家重点实验室(筹),陕西西安710055 [3]山东建筑大学土木工程学院,山东济南250101

出　　处：《混凝土》2011年第1期62-64,共3页Concrete

基　　金：国家自然科学基金资助项目(50678143)

摘　　要：钢筋混凝土受弯构件通常忽略其混凝土的抗拉承载能力,然而裂缝间的混凝土和钢筋仍然保持着部分黏结,存在受拉刚化效应,这一效应能够影响构件开裂后刚度的大小,进而影响构件在使用荷载下挠度大小和裂缝宽度,影响构件适用性。受拉刚化效应对板,尤其是对新型材料薄板开裂后刚度的影响更为显著。通过试验对当前几个主要力学模型挠度计算方法进行考察研究,证实了受拉刚化效应在板挠度变形中的影响,并分析了各计算模式的计算精度。Usually, the tensile capacity of reinforced concrete is neglected when calculating the strength of a flexural concrete member.But there is still some bond between the cracks, which is called tension stiffening and it can affect the member stiffness after cracking and hence the deflection of the member and the width of the cracks under service loads.Tension stiffening has significant influence on the slab, especially to the new type of slab. In this paper, the approaches to account for tension stiffening at present are studied critically by test.Then the effect of the tension stiffening in the course of deflection deformation is illustrated and the accuracy of the calculation models is also analyzed.Finally,conclusions are proposed.

关 键 词：钢筋混凝土板 刚化效应 挠度 裂缝 

分 类 号：TU528.01[建筑科学—建筑技术科学]