基于准平面假定的内嵌CFRP筋加固宽缺口混凝土梁刚度研究  

Research on the rigidity of wide gap concrete beam strengthened with embedded CFRP bars based on the quasi plane assumption

作　　者：曾宪桃[1,2] 任振华 孙浚博[3] ZENG Xiantao;REN Zhenhua;SUN Junbo(School of Building Engineering,Hunan Institute of Engineering,Xiangtan 411104,China;CIC of Wind Power Equipment and Energy Conversion,Xiangtan 411104,China;School of Civil,Environmental and Mining Engineering,University of Western Australia,WA 6009,Australia)

机构地区：[1]湖南工程学院建筑工程学院,湖南湘潭411104 [2]风电装备与电能变换协同创新中心,湖南湘潭411104 [3]西澳大利亚大学土木工程、环境与采矿工程学院,澳大利亚西澳洲6009

出　　处：《自然灾害学报》2019年第3期96-103,共8页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51678430);湖南省自然科学基金项目(2017JJ4016,2018JJ4042)~~

摘　　要：宽缺口混凝土梁是为研究CFRP筋与混凝土界面特性而构造的一种新型混凝土梁,为分析该新型梁加固后的变形与刚度特性,在完成了16根内嵌CFRP筋加固各类混凝土梁静载试验,并详细量测和研究其变形刚度的基础上,基于FRP类材料加固混凝土梁应变协调的准平面假定,根据传统的钢筋混凝土刚度研究理论,在充分考量CFRP筋的刚度贡献的前提下,对内嵌CFRP筋加固的宽缺口混凝土梁的刚度的计算公式进行了理论推导,并将理论公式的计算结果与实测结果进行了比对。研究结果表明:与对比梁相比,内嵌CFRP筋材加固的宽缺口混凝土梁和内嵌CFRP筋加固的普通混凝土梁的刚度有小幅度提高,内嵌的CFRP筋能有效延缓裂缝的发展,减小混凝土梁变形。The wide gap concrete beam is a new type of concrete beam to study the characteristics of CFRP and concrete interface. A total of 16 embedded CFRP bars were completed to reinforce each type of concrete beam static load test in order to analyze the deformation and stiffness characteristics of the new beam and the deformation stiffness is measured and studied in detail. According to the traditional theory of reinforced concrete stiffness and on the premise of fully considering the stiffness contribution of CFRP bars, the theoretical derivation of the calculation formula of the stiffness of a wide gap concrete beam with embedded CFRP reinforcement is presented based on the quasi-plane assumption of strain coordination of reinforced concrete beams strengthened with FRP class materials and the calculation results of the theoretical formula are compared with the measured results. Compared to the comparison beam, the results show that the stiffness of common concrete beams reinforced with CFRP reinforced concrete beams and embedded CFRP bars has a small increase, and the embedded CFRP bars can effectively delay the development of cracks and reduce the deformation of concrete beams.

关 键 词：准平面假定 碳纤维增强塑料筋 内嵌加固 宽缺口混凝土梁 刚度 

分 类 号：TU375.4[建筑科学—结构工程] X9[环境科学与工程—安全科学]