CFRP和混凝土叠合层加固预应力空心楼板的破坏模式分析  

Analysis on Failure Modes of the Pre-stressed Concrete Hollow Core Slab Strengthened with CFRP and Concrete Composite Layer

作　　者：胡克旭[1] 张马秀[1] 刘宜良[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《结构工程师》2016年第2期46-52,共7页Structural Engineers

基　　金：国家科技支撑计划课题(2009BAJ28802)

摘　　要：在前期进行的CFRP与混凝土叠合层加固预应力混凝土空心楼板的受力性能试验和计算方法研究的基础上,对加固预应力空心楼板的破坏模式进行分析。结果表明,加固预应力空心楼板的破坏模式主要有钢筋拉断、CFRP拉断、CFRP剥离、混凝土压碎的弯曲破坏以及斜截面剪切破坏五种模式;而且CFRP加固量、CFRP覆盖率、叠合层厚度和混凝土强度对破坏模式有明显影响。在实际工程中,应通过控制CFRP的用量,避免构件发生剪切破坏;尽量增大CFRP的覆盖率以充分利用CFRP材料的抗拉强度。Based on the early experimental and theoretical studies on the pre-stressed concrete hollow core slab strengthened with CFRP and concrete composite layer, this paper conducted analyses on failure modes of strengthened members. Results show five failure modes for the members ： tensile failure of reinforcement, tensile failure of CFRP, splitting of CFRP, crush of concrete, and shear failure. The amount ratio of CFRP, the coverage ratio of CFRP,the composite layer height and concrete strength have significant influence on failure modes of the members. In strengthening practices,the amount ratio of CFRP should be controlled to avoid shear failure and the increase of the CFRP coverage ratio can make full use of the high tensile strength of CFRP.

关 键 词：预应力空心楼板 CFRP加固 混凝土叠合层加固 破坏模式 

分 类 号：TU378.5[建筑科学—结构工程]