玄武岩纤维布加固连续梁弯矩重分布特征分析

Moment redistribution in continuous beams strentgthened with basalt fiber reinforced polymer

对4根玄武岩纤维布加固的混凝土 T 形截面连续梁和1根对比梁进行抗弯试验，分析了试验梁的破坏模式和各控制截面的弯矩调幅系数.试验结果表明：加固梁跨中截面纵筋屈服前，加固梁和对比梁各控制截面荷载-挠度曲线基本重合；跨中截面纵筋屈服后，加固梁发生了明显的弯矩重分布，跨中截面弯矩调幅系数为0.09~0.22，中支座截面弯矩调幅系数为0.15~0.38；1~3层纤维布加固梁荷载-挠度曲线具有屈服平台，表现出明显的延性破坏特征.

To analyze characteristics of moment redistribution of beams strengthened with BFRP sheets,flexural tests were conducted on one comparative continuous beam and four strengthened RC T-section continuous beams. Failure modes and modulation coefficients were analyzed. The results show that load versus displacement curves of control sections nearly overlap with each other before yielding of longitudinal rebar at mid-span. After the yielding of the rebar,obvious moment redistribution occurs. Moment modulation coefficients of the middle sup-port section ranges from 0. 09 to 0. 22. Moment modulation coefficients of the middle support section ranges from 0. 15 to 0. 38. Beams strengthened with one to three plies of BFRP sheets have a yielding platform in load versus displacement curves,and are subjected to obvious ductility failure.