论文部分内容阅读
完成了9个冲跨比为7的钢筋混凝土板柱节点受冲切破坏试验,得到了荷载-挠度曲线、应变及破坏形态等信息。根据本试验结果和历史试验数据,分析了混凝土强度、纵向配筋率、纵筋屈服强度等因素对试验板破坏形态及受冲切承载力的影响,并将受冲切承载力试验值与我国混凝土规范GB 50010—2010、美国规范ACI 318-08、欧洲规范EN 1992-1-1∶2004和CEB-FIP Model Code 2010规范的计算值进行了对比。结果表明:相对于普通强度混凝土板柱节点,高强混凝土板柱节点的破坏特征对配筋情况并不敏感;混凝土强度和配筋率的变化将影响构件的破坏模式;我国混凝土规范计算得到的高强混凝土板柱节点受冲切承载力比普通强度混凝土板柱节点的计算结果保守;我国混凝土规范中的混凝土抗拉强度不能很好地反映混凝土强度对受冲切承载力的影响;纵筋配筋率对受冲切承载力有较大影响。
The nine punching failure tests of 9 columns with span-to-span ratio of 7 were completed, and the load-deflection curve, strain and failure mode were obtained. According to the test results and historical test data, the influences of concrete strength, longitudinal reinforcement ratio, longitudinal reinforcement yield strength and other factors on the failure mode and the punching shear capacity of the test plate are analyzed. Comparisons were made between the concrete specifications GB 50010-2010, the United States Code ACI 318-08, the European Code EN 1992-1-1: 2004 and the CEB-FIP Model Code 2010 specifications. The results show that the failure characteristics of high-strength concrete slab-column joints are not sensitive to the condition of reinforcement compared with ordinary strength concrete slab joints. The change of concrete strength and reinforcement ratio will affect the failure modes of members. The concrete strength of concrete The punching shear capacity of concrete slab-column joints is more conservative than that of ordinary strength concrete slab-column joints. The tensile strength of concrete in China’s concrete code can not well reflect the influence of concrete strength on punching shear strength. Rate by punching bearing capacity have a greater impact.