FRP筋混凝土受弯力学性能预测模型  

Prediction models of flexural behavior of concrete beams reinforced with FRP rebars

作　　者：何政[1] 王勃[1] 

机构地区：[1]哈尔滨工业大学土木工程学院

出　　处：《哈尔滨工业大学学报》2007年第12期1849-1853,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50208007)

摘　　要：对五根配有GFRP筋的混凝土梁进行了三分点静力加载试验,研究在不同荷载水平下的裂缝开展情况、纯弯段的曲率以及跨中最大挠度的变化规律.在此基础上,考察了混凝土受弯构件挠度计算中的有效惯性矩法和曲率法.比较结果表明,基于有效惯性矩的计算公式仅能较好地预测低荷载水平下梁跨中挠度的发展情况,随着荷载水平的提高,预测误差变得越来越明显.曲率法中的全曲率法(CCA)预测的跨中挠度变化规律与试验数据最为接近,但CCA法过于繁琐,不适于工程计算.CCA法的简化形式-SCA法在预测截面应变发展规律方面与CCA法同样具有较好的精度,在预测梁跨中挠度方面,SCA法的精度略优于有效惯性矩法.Five concrete beams reinforced with glass fiber reinforced polymer （GFRP） rebars were statically loaded under third - point flexure until failure. The development of cracks, the curvature in pure flexure zone and the deflection at mid - span were recorded during the test. Based on this, two series of approaches, i. e. the effective moment of inertia approach （EMOIA） and curvature approach （CA） which are used to predict the flexural deflection of concrete beams were evaluated. The evaluation indicates that all the selected EMOIA models only yield acceptable predictions of deflection development at rather early stage. As load level increases, the errors arise from EMOIA become more and more significant. The most desirable predictions of deflec- tion at mid - span can be achieved by using complete curvature approach （CCA）. However, CCA is too time -consuming to be applied in engineering practice. The simplified curvature approach （SCA） is found to be almost as accurate as CCA in predicting the development of sectional strains in pure flexure zone of the beams, and SCA seems to be little more accurate than the EMOIA models in predicting the deflection at midspan.

关 键 词：FRP筋 混凝土 受弯 曲率 有效惯性矩 

分 类 号：TU528[建筑科学—建筑技术科学]