预压比对预应力钢绞线-聚合物砂浆加固RC板受弯性能的影响  

Study on Preloading Ratio on Flexural Behavior of RC Slabs Strengthened With Prestressed Strand and Polymer Mortar

作　　者：张世江 陈海 刘阳[1,2] 叶勇 柴振岭[1,2] ZHANG Shijiang;CHEN Hai;LIU Yang;YE Yong;CHAI Zhenling(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province,Xiamen 361021,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]福建省结构工程与防灾重点试验室,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2018年第2期186-191,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51378228;51578254;51308236);福建省自然科学基金资助项目(2015J01212;2014J05061);福建省泉州市科技计划项目(2015Z142)

摘　　要：建立预应力钢绞线-聚合物砂浆加固钢筋混凝土(RC)板的有限元分析模型,并采用已有的试验数据对模型的准确性进行验证.利用有限元模型研究不同工况、预压比,以及预应力度对加固板受弯性能的影响.分析结果表明:采用生死单元可较好模拟混凝土板的二次受力效应;在二次受力条件下,预应力钢绞线可达到与一次受力相近的加固效果;当预压比较小(≤0.1)时,由于混凝土损伤较小,试件变形属于弹性变形,可按一次受力情况考虑,当预压比较大(≥0.1)时,由于混凝土损伤较大,试件进入塑性,需考虑二次受力的影响.A finite element(FE)model for reinforced concrete(RC)slabs strengthened with prestressed strand and polymer mortar is established.The FE model is validated by available test results.The validated FE model is then used to study the influence of different load conditions,preloading ratios and prestress degree on the flexural behavior of the strengthened RC slabs.The FE analysis indicates:the birth and death of element can simulate effectively the influence of secondary load.Under the condition of secondary load,the reinforcement of prestressed strand is similar to that under the condition of primary load.When the preloading ratio is less than 0.1,the specimen deforms elastically due to the minor damage in the concrete,and the secondary load effect can be neglected.When preloading ratio is greater than 0.1,plastic deformation occurs in the specimen due to considerable damage in the concrete,and the secondary load effect should be taken into account.

关 键 词：预应力钢绞线 钢筋混凝土板 受弯加固 数值模拟 生死单元 

分 类 号：TU378[建筑科学—结构工程]