钢筋混凝土简支深梁抗剪强度分析

发布时间：2018-05-22 20:33

本文选题：简支深梁 + 抗剪强度　；参考：《长安大学》2013年硕士论文

【摘要】：深梁一般指的是计算跨长与高度之比不大于2的简支梁和不大于2.5的连续梁，其抗弯、抗剪强度根据不同的计算理论，建立不同的计算模型，将会得出有差异的结果。而实际工程中又常能遇到深梁的情况，，给工程师带来困难。本文从混凝土的塑性理论及极限分析入手，探讨了求解钢筋混凝土简支深梁的抗剪强度的计算方法，建立了钢筋混凝土简支深梁的剪切破坏机制，确定出构件塑性破坏时的极限荷载，对简支深梁的计算提供简化的方法。简要介绍了混凝土塑性理论的基本原理；混凝土、钢筋的塑性性质；屈服线、变形和应变以及能量守恒等问题，确定了利用上限方法求解极限荷载的方法。根据上述原理，建立了4个钢筋混凝土简支深梁剪切破坏机制的模型。通过对这4个破坏机制的计算分析，利用外力功与材料的耗散能量相等的原理，求出与破坏机制对应的极限荷载。同时，对一些相关系数进行了分析和推导。对4种配置不同抗剪钢筋的钢筋混凝土简支深梁（包括无腹筋深梁，仅有横向腹筋的深梁，仅有竖向腹筋的深梁，既有横向也有竖向腹筋的深梁）共123个试验梁的实验结果进行对比，验证了这4种剪切破坏机制的合理性，并对计算的结果进行统计分析。结果表明：从破坏机制上得到的计算结果与实验结果吻合较好，说明建立的破坏机制是合理的。确定了一个合理反映计算极限荷载和实际破坏荷载之间的计算系数。
[Abstract]:A deep beam generally refers to a simple beam and a continuous beam with a ratio of not more than 2 to the length and height. The bending and shear strength of the deep beam will be based on different calculation theories, and different calculation models will be established. In practical engineering, it often meets the situation of deep beams and brings difficulties to the engineers. This paper from the concrete Based on the plastic theory and the limit analysis, the calculation method of the shear strength of the reinforced concrete simply supported deep beam is discussed, the shear failure mechanism of the reinforced concrete simply supported deep beam is established, the ultimate load of the plastic failure of the member is determined, and the simplified method for the calculation of the simple supported deep beam is provided.
This paper briefly introduces the basic principles of concrete plastic theory, the plastic properties of concrete, steel bars, yield lines, deformation and strain and energy conservation, and determines the method of using the upper limit method to solve the limit load.
According to the above principles, 4 models of shear failure mechanism of reinforced concrete simply supported deep beams are established. Through the calculation and analysis of the 4 failure mechanisms, the ultimate load corresponding to the failure mechanism is obtained by using the principle that the external force work is equal to the dissipative energy of the material. At the same time, some related coefficients are analyzed and deduced.
4 kinds of reinforced concrete simple supported deep beams (including deep beams without abdominal tendons, only deep beams with transverse abdominal tendons, deep beams with only vertical abdominal tendons, and deep beams with vertical abdominal tendons) are compared, and the rationality of these 4 shear failure mechanisms is verified and the results of the calculation are obtained. Statistical analysis shows that the calculated results from the failure mechanism agree well with the experimental results, indicating that the failure mechanism is reasonable.
A reasonable calculation coefficient between the calculated ultimate load and the actual failure load is determined.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.1

【参考文献】