附着式升降脚手架不同步运动时结构的响应分析

Response Analysis of Structure of the Attached Lifting Scaffold during the Unsynchronized Motion

目的研究不同步运动下架体结构附着支撑点处的内力和导轨关键节点处的转角位移变化,分析导轨所在立杆与大横杆连接点处应力.方法考虑架体结构在施工荷载作用下的影响,利用有限元分析软件ANSYS对整个架体在不同位移工况下的响应进行数值模拟,分析每种工况下最大应力出现的节点位置以及在升降阶段位移差值与节点应力和关键点转角位移之间的关系.结果当架体发生不同步运动时,导轨所在立杆与横杆的连接处有可能发生塑性破坏,架体关键点转角位移的变化率随跨距的增大而变小,而底层关键点转角位移相比其他几层要更大,分析得到了支撑点应力和转角位移随位移差值的变化规律.结论当导轨发生不同步运动时,附着支撑点及其相临附着支撑点处内力变化较为明显,关键点转角随位移差值的变大而变大,其立杆与横杆的连接处很有可能出现应力的最大值.

The paper analyzes the change of the internal force of supporting points and the angular displacement of the key nodes at the guide way of the frame structure under the condition of asynchronous motion,at the same time,stress analysis is carried out on the connection point between the vertical bar and the large cross bar,which provides a reference for the structural design andcontrol use of the frame. Considering the influence of the frame structure under the action of the construction load,the response of the whole frame is simulated under different displacement conditions by the finite element analysis software ANSYS,and the node position of maximum stress and relationship between the different displacement value of the frame and the stress of the node are analyzed. From the calculation results of finite element,when the asynchronous movement occurs,the joint of the vertical bar and the cross bar may have plastic damage,the change rate of the corner displacement of the key point decreases with the increase of the span,while the key point of the bottom is larger than that of the other layers. Besides,the stress variation curve of supporting point and critical point rotation angle along with the change of displacement value are obtained.When the guide rail occurs asynchronously,the internal force change at the attachment support point and neighboring attachment support point is more obvious. The rotation becomes larger with the increase of the displacement difference,and the maximum value of the stress is likely to appear at the connection between the vertical bar and the cross bar.