摘要
通过对4根低周反复荷载作用下的PSRC梁和1根单调加载的PSRC梁的对比试验,研究了剪跨比、加载方式及现浇混凝土强度对PSRC梁裂缝发展、破坏形态及受剪承载力的影响,并在JGJ 138—2016《组合结构设计规范》基础上建立了适用于PSRC梁斜截面受剪承载力公式。研究结果表明:反复荷载作用下PSRC梁的斜截面受剪承载力比单调加载低,且循环次数越多,受剪承载力降低越多;剪跨比为2试件的极限承载力和斜截面受剪承载力比剪跨比为1的试件低;现浇混凝土强度等级对正向加载时的受剪承载力有一定影响。
The contrast tests of four PSRC beams under low cyclic loading and one PSRC beam under monotonic loading were carried out.The influence of shear-span ratio,loading method and concrete strength in the cast-in-place area on crack development,failure forms and shear bearing capacity was studied.Based on the code for design of composite structures,a formula for shear capacity of PSRC beams with inclined section was established.The test results show that the shear capacity of PSRC beams with inclined section under low cyclic loading is lower than that under monotonic loading,and the more cycle number,the more decreased degree of shear capacity.The ultimate bearing capacity and shear bearing capacity of the specimens with 2 shear-span ratio are lower than one shear-span ratio.The strength grade of cast-in-place concrete has a certain influence on the shear capacity under forward loading.
出处
《混凝土与水泥制品》
北大核心
2019年第8期67-71,共5页
China Concrete and Cement Products
基金
国家自然科学基金项目(51478287)
