FRP加固SRHC梁界限破坏时抗弯承载力计算

提出FRP(纤维增强复合材料)加固SRHC(钢骨高强混凝土)受弯构件的概念,解决FRP加固后SRHC柱的破坏机理、受力性能问题,提出其界限破坏时的简化抗弯承载力计算公式。在以往FRP加固RC(钢筋混凝土)梁力学性能分析结果的基础上,采用新的叠加方法对FRP加固SRHC梁的受力过程、破坏特征、受力特点进行研究。根据中和轴与钢骨的截面位置不同,建立了相应的抗弯承载力计算方法,并提出了界限破坏时的受压区高度。将受压区高度与钢骨上翼缘至混凝土受压边缘的距离进行比较,以此来确定FRP加固后梁在界限破坏时的不同抗弯承载力的适用公式,给实际应用带来方便。

CALCULATION METHOD OF FLEXURAL BEARING CAPACITY UNDER LIMITATION FAILURE OF SRHC BEAMS STRENGTHENED WITH FRP

To solve the problem of SRHC beam strengthened with FRP(Fiber Reinforced Polymer),a new renovate SRC beam of strengthened with FRP has been brought forward.The damage and bearing capacity under the limitation failure of SRHC beam strengthened with FRP are studied,the reasonable formulas for calculating has been put forward.the load-deformation process、flexural failure characteristics of SRHC beams strengthened with FRP were researched by a new practical superposition method based on prevenient analyzing results of RC beams strengthened with FRP.A corresponding calculation method of flexural capacity according to the different positions of central axis and section of steel under the limitation failure can be derived.The compressive region height under the limitation destroy is put forward,Compare the relation between the compressive region height with the distance of top flange of steel to the compression flange of concrete,hence,a applied formula to the different flexural capacity under the limitation failure of beams strengthened with FRP is got,which is convenient for actual use.