外贴CFRP加固梁斜截面受力性能的分析和计算

通过 16根钢筋混凝土简支梁外贴CFRP抗剪加固的试验 ,分析了构件的破坏形态、斜截面纤维应变分布特征及承载力的影响因素。无论构件发生何种破坏 ,其斜截面纤维的应变分布是不均匀的 ,纤维材料强度不能得到充分利用。根据试验结果 ,对斜截面纤维应变分布规律进行了研究 ,综合考虑裂缝倾角的影响 ,建立了与构件剪跨比的关系式。在此基础上 ,提出CFRP加固梁抗剪承载力的计算方法 ,并对计算值与试验值进行了比较 ,结果是偏于安全的

ANALYSIS AND CALCULATION OF SHEAR BEHAVIORS FOR BEAMS STRENGTHENED WITH EXTERNALLY BONDED CFRP SHEETS

Based on the experiment of sixteen simply supported beams strengthened in shear with CFRP sheets, the failure modes, the strain distribution feature of CFRP intersected by the oblique section and the influence factors of shear strength are studied. Considering the non uniformity of strains in CFRP and the angle of critical shear crack synthetically, the formulas related with shear span ratio are proposed. And then, a calculation method of the shear bearing capacity is established whose results are acceptable comparing with the experimental data.