高延性混凝土无腹筋梁受剪性能试验研究

发布时间：2018-03-13 19:11

本文选题：高延性混凝土　切入点：无腹筋梁　出处：《工程力学》2016年10期 　论文类型：期刊论文

【摘要】：提出采用高延性混凝土改善梁的抗剪性能和变形能力,设计了8个高延性混凝土梁和3个作为对比试件的混凝土梁,并通过静力试验研究不同剪跨比和配筋率高延性混凝土无腹筋梁的破坏形态和破坏机理。高延性混凝土无腹筋梁的剪切破坏形态有挤压破坏、剪压破坏、弯剪破坏和剪拉破坏。试验结果表明:高延性混凝土梁的剪切破坏均表现出一定的延性,与普通混凝土梁的脆性剪切破坏具有明显不同;高延性混凝土梁的剪切裂缝开展缓慢,说明高延性混凝土良好的拉伸应变硬化和多裂缝开展特性能够有效控制剪切裂缝的发展,防止混凝土压碎剥落,显著提高梁的抗剪性能和耐损伤能力;相比普通混凝土无腹筋梁,高延性混凝土无腹筋梁的受剪承载力和变形能力均有明显提高,表明采用高延性混凝土可以显著改善无腹筋梁的脆性剪切破坏模式;剪跨比和纵筋配筋率对高延性混凝土梁的剪切破坏形态和承载力影响较大,其受剪承载力随剪跨比的增大而降低,随配筋率的增大而有所提高。
[Abstract]:In this paper, high ductility concrete is used to improve the shear behavior and deformation ability of beams. Eight high ductile concrete beams and three concrete beams with high ductility are designed. The failure modes and failure mechanism of high ductile concrete beams without web reinforcement with different shear span ratio and reinforcement ratio are studied by static test. The shear failure patterns of high ductile concrete beams without web reinforcement are extruded and shear-compression failure. The experimental results show that the shear failure of high ductile concrete beams shows a certain ductility, which is obviously different from the brittle shear failure of ordinary concrete beams, and the shear cracks of high ductile concrete beams develop slowly. It is shown that the good tensile strain hardening and multi-crack development characteristics of high ductile concrete can effectively control the development of shear cracks, prevent concrete crushing and spalling, and significantly improve the shear performance and damage resistance of beams. Compared with ordinary concrete beams without web tendons, the shear capacity and deformation capacity of high ductile concrete beams without web reinforcement are obviously improved, which indicates that the brittle shear failure mode of beams without web reinforcement can be significantly improved by using high ductile concrete. The shear span ratio and the reinforcement ratio of longitudinal reinforcement have great influence on the shear failure pattern and bearing capacity of high ductile concrete beams. The shear bearing capacity decreases with the increase of shear span ratio and increases with the increase of reinforcement ratio.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(51578445) 西安市科技计划项目(CX13135-3)
【分类号】：TU375.1

【参考文献】