纤维增强聚合物(FRP)筋混凝土双向板冲切性能研究

项目名称： 纤维增强聚合物(FRP)筋混凝土双向板冲切性能研究

项目编号： No.50879082

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 朱海堂

作者单位： 郑州大学

项目金额： 35万元

中文摘要： 进行了20组120个纤维增强聚合物（FRP）筋与混凝土的粘结性能试验和17块集中荷载作用下FRP筋混凝土双向板的冲切性能试验，建立了FRP筋与混凝土的粘结滑移本构模型，分析了FRP筋配筋率、板边长比、荷载作用位置、混凝土强度等因素对FRP筋混凝土双向板开裂、破坏形态、FRP筋应力状态、冲切承载力以及冲切变形的影响。基于数理统计方法，在考虑FRP筋及其与混凝土粘结性能特点的基础上，引入等效冲跨比、FRP筋等效配筋率和名义屈服强度等指标，建立了任意集中荷载作用下FRP筋混凝土双向板的冲切破坏机理和计算模型，提出了反映FRP筋及其增强混凝土双向板冲切受力特点的任意集中荷载作用下FRP筋混凝土双向板的冲切承载力计算方法；基于试验结果、弹性薄板理论和塑性理论，提出了四边简支FRP筋混凝土双向板的冲切承载力塑性解以及不同约束条件下FRP筋混凝土双向板的弯曲承载力及其变形计算方法；基于非线性有限元理论，进行了FRP筋混凝土双向板的冲切破坏全过程数值模拟。本项目研究成果对丰富和发展FRP筋混凝土双向板设计理论，推动FRP筋在水利、港口、海洋等严酷环境下土木工程中的应用具有重要的理论意义和应用价值。

中文关键词： 纤维增强聚合物（FRP）筋；双向板；冲切性能；破坏机理；计算方法

英文摘要： Based on the bonding tests of 120 bonding specimens of fiber reinforced polymer（FRP）bar to concrete and the punching shear tests of 17 FRP reinforced concrete two-way slabs under concentrated load, the bond-slip model of FRP bars to concrete was established, and the influence of some factors, such as FRP reinforcement rate, aspect ratio of slab, load position, concrete strength, on the crack, failure pattern, stress state of the FRP bar, punching shear bearing capacity, and punching deformation were investigated. Based on mathematical statistic method, the mechanics characteristics of FRP bar, and the bonding performance of FRP bar to concrete, introducing the equivalent punching-span ratio of slab, equivalent ratio and nominal yield strength of FRP bar, the punching shear failure mechanism and calculation model of FRP reinforced concrete two-way slabs under random concentrated load were established, and the calculation method of punching shear bearing capacity on FRP reinforced concrete two-way slab, which reflects the mechanics characteristics of FRP bar and concrete two-way slab reinforced with FRP bars, were put forward. Based on the test results, elastic thin plate theory and the plastic theory, the plastic solution of punching bearing capacity on FRP bars reinforced concrete two-way slab with four-sides simply supported and the calculating method of flexural capacity on FRP bars reinforced concrete two-way slabs with different restraint conditions were proposed. Moreover, on the basis of nonlinear finite element theory, the punching failure process simulation of concrete two-way board reinforced with FRP bars was studied. Above research achievements will have important theoretical significance and practical value not only to enrich and develop design theory of FRP bars reinforced concrete two-way slab, but also to promote the application of FRP bars in civil engineering under harsh environment such as water conservancy, port, ocean, and so on.

英文关键词： fiber reinforced polymer（FRP）bar；two-way slab；punching behavior；failure mechanism；calculating method