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该文通过移位工程框架柱包裹式托换节点缩尺模型的正交实验,研究和分析了托换梁剪跨比对托换节点破坏形态和受力性能的影响。按照构件剪跨比的不同将滚轴正常布置条件下的破坏形态归纳为行走梁的受弯破坏和弯剪破坏两种形式,得出连梁与柱结合面这一薄弱环节,并得出了不同剪跨比下托换节点的裂缝发展和最终破坏规律。通过对试验数据的正交分析和回归分析,可知在所研究因素当中剪跨比对托换节点承载力的影响最为显著,得出在一定取值范围内剪跨比与托换节点的开裂荷载、破坏荷载分别具有较理想的线性关系,减小剪跨比可以有效提高构件的承载能力。提出了引入剪跨比条件下框架柱托换节点承载力的计算公式;分析了剪跨比对滚轴受力均匀情况的影响。通过对比试验,研究了不同滚轴布置方式对托换节点的影响。
In this paper, the influence of shear span ratio of underpinning beam on the failure mode and bearing capacity of the underpinning joint is studied and analyzed through the orthogonal experiment of displacement scale of the frame-supported underpinning joint of engineering frame column. According to the difference of member shear span ratio, the failure modes under the normal arrangement of rollers are summed up as bending damage and bending shear failure of walking beam, and the weak link between beam and column is obtained. Crack development and ultimate failure of underpinning joints under different shear-span ratios. Through the orthogonal analysis and regression analysis of test data, we can see that among the studied factors, the influence of shear span ratio on the bearing capacity of the support node is the most significant. The results show that the shear span ratio and the cracking load of the support node within a certain value range , Respectively. The destructive loads have an ideal linear relationship respectively. Reducing the shear-span ratio can effectively improve the bearing capacity of components. The formula for calculating bearing capacity of underpinning of frame columns with shear-span ratio is put forward. The influence of shear span ratio on the uniformity of roller bearing is analyzed. Through the contrast test, the effect of different roller arrangement on the underpinning node is studied.