碳纤维布加固某开裂现浇楼板效果分析  

Effectanalysis of a cracking cast-in-place floor strengthenedby CFRP sheets

作　　者：何夕平[1] 杨波[1] 张运帅[1] 王彪 

机构地区：[1]安徽建筑工业学院,安徽合肥230022 [2]安徽四惠大成有限责任公司,安徽合肥230011

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第1期51-57,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家科技支撑计划课题资助项目(2011BAJ03B04);安徽建筑工业学院自然科学基金资助项目(KF2009.10)

摘　　要：某建材大市场C1楼现浇楼板普遍产生贯穿性裂缝,部分裂缝宽度达到0.35mm,严重影响到了建筑物的使用功能.结合工程实际使用材料,通过计算说明了由于混凝土收缩变形过大而产生裂缝的必然性.在对裂缝进行检测和原因分析的基础上,确定采用碳纤维布进行加固.选取二层顶板(4-1/4)/(A-B)轴的楼板裂缝作为研究对象,先理论计算出碳纤维布加固该开裂楼板的抗弯刚度,从而计算出板的跨中挠度.最后利用ANSYS有限元软件,建立满足正常使用功能的楼板模型并施加荷载,得到板跨中挠度的模拟值.并与理论计算值、规范值对比分析,说明加固后的楼板变形满足正常使用要求.A variety of penetrating cracks occurred in cast-in-place floor of C1 building in a building material market. Some crack mouth opening displacements have reached 0.35ram especially. The application of the building has been seriously af fected by these cracks. In order to explain how these cracks come about by, combining the engineering materials actually used in this project,this article analyzes the reason of cracks by computing the shrinkage deformation of concrete and ex plains have they are caused by shrinkage of concrete. Based on the cracks inspection and cause analysis, an alternative scheme that CFRP sheets can be used to strengthen the floor. Besides, taking the second floor （（4--1/4） / （A--B） axis） strengthened by CFRP sheets of C1 building as the research object, is proposed the values of flexural rigidity and mid- span deflection are calculated. Finally, applying the finite element software ANSYS to model building of the floor achie ving a function of natural service, the numerical simulation values of mid-span deflections are obtained. Meanwhile, the theoretical calculation values are compared with the numerical simulation values and the code values. The comparison re- sults show that theoretical calculation values are smaller than theoretical calculation values and code values. A conclusion is drawn to irdicatve that the floor deformation can meets the normal demands of application.

关 键 词：碳纤维布 现浇楼板 裂缝 挠度 ANSYS 

分 类 号：TU375.1[建筑科学—结构工程]