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根据工程实际进行了托换试件设计,设计中考虑了砖的强度、穿筋的数量、托换梁的高度等影响因素.试验与分析结果表明,托换体系有两种破坏形式,一是沿砖砌体和托换梁混凝土界面发生冲剪滑移破坏,二是沿砖砌体跨中出现劈开破坏.托换试件的抗冲剪承载力随着托换梁的高度、砖砌体的强度的增大而提高,托换试件抗劈开破坏承载力取决于托换梁的截面尺寸、穿筋的配置量和支座与托换梁间的摩擦系数等因素.最后建立了托换体系平面桁架力学模型,为了防止发生冲剪破坏,以劈开破坏的设计承载力的1.5倍作为冲剪破坏的验算荷载,如不能满足则加大托换梁的高度.
According to the engineering practice, the design of underpinning specimen was taken into consideration, and the influencing factors such as the strength of brick, the number of wearing tendons and the height of underpinning beam were taken into consideration in the design.Experimental and analysis results showed that the underpinning system had two kinds of damage forms, one Along the brick masonry and underpinning concrete shear interface shear damage occur, and second, along the brick masonry split appears in the splitting. Shear test specimen shear capacity with the care of the beam height, brick The strength of the body increases and increases, underpinning specimen cracking resistance depends on the load-carrying capacity of the cross-section of the beam, wear reinforcement configuration and the amount of friction between the support and underpinning and other factors.Finally established In order to prevent punching shear failure, 1.5 times of the design carrying capacity of the split design was used as checking load of punching shear failure. If not satisfied, the height of the underpinning beam was increased.