混凝土弯冲板的破坏机构与极限强度

详细信息

NEW COLLAPSE MECHANISM AND ULTIMATE PUNCHING SHEAR STRENGTH OF REINFORCED CONCRETE SLABS

Fuzhou University, Fuzhou, Fujian 350002, China;2. Zhejiang University, Hangzhou, Zhejiang 310027, China

摘要: 根据试验结果,建立了考虑弯曲变形的新的斜锥面冲切破坏机构,基于塑性极限分析理论,采用双剪应力强度准则,推导得到钢筋混凝土板斜锥面抗冲切荷载表达式,并提出冲切板的极限承载力由斜锥面实际抗冲切力和板抗弯能力二个部分组成.对国内外101个冲切试件的计算结果表明,理论值与实测值吻合良好.
- 混凝土弯冲板 /
- 破坏机构 /
- 极限强度
Abstract: Based on test results, a new collapse mechanism of punching shear failure of concrete slabs is established in this paper. The twin shear strength theory is used in the plastic limit analysis to obtain the punching shear capacity from the failure cone. It is suggested that the ultimate punching shear strength of reinforced concrete slabs consist of the punching resistance capacity of the failure cone and a part of flexure strength of the whole slab. The formulas are provided to calculate the strengths of ordinary-strength concrete slabs, high-strength concrete slabs, steel-fiber reinforced ordinary-strength concrete slabs and steel-fiber reinforced high-strength concrete slabs subjected to punching shear. Good agreement between the present theoretical values and available experimental results is achieved.
- punching shear /
- collapse mechanism /
- ultimate strength