铝合金模板半刚性连接试验评估和参数分析

为研究铝合金模板在半刚性连接下的破坏形式、连接性能以及承载能力的主要影响因素，文章进行铝合金模板半刚性连接的静力加载试验，并通过ABAQUS软件建立有限元模型，将有限元模拟结果与试验结果进行对比，验证有限元模型的有效性。在此基础上探究不同销钉数量对铝合金模板半刚性连接性能、承载能力的影响和面板及纵肋厚度、边肋及端肋高度、边肋及端肋壁厚、横肋数量、横肋壁厚5种参数对竖向荷载作用下模板挠度的影响，进而对25种不同几何参数组合下的模板进行基于正交试验的方差分析以比较不同参数对模板承载能力的影响程度。结果表明：整个加载过程中边肋的应力一直处于较高水平；模板断裂时的最大应力点位于破坏点位于加载点正下方的销钉孔处；增多销钉数量可以提高半刚性连接初始刚度和极限弯矩；不同几何参数对模板承载能力的影响程度从大到小依次为横肋数量、面板及纵肋厚度、边肋及端肋壁厚、横肋壁厚、边肋及端肋高度。

In order to study the damage form, connection performance and the main influencing factors of load carrying capacity of aluminum alloy formwork (AAF) under semi-rigid connection, this paper conducts the static loading test on the semi-rigid connection of AAF and establishes the finite element model by ABAQUS, and compares the finite element simulation data with the test data to validate the effectiveness of the finite element model. On this basis, the effects of different pin numbers on the semi-rigid connection performance and load carrying capacity of AAF and the effects of five parameters, namely, the thickness of face plate and longitudinal ribs, the height of side and end ribs, the thickness of side and end ribs, the number of transverse ribs and the thickness of transverse ribs, on the maximum displacement of the formwork under the action of vertical load were investigated. The analysis of variance (ANOVA) based on orthogonal tests was performed on the formwork with 25 different combinations of geometric parameters to compare the influence of different parameters on the load carrying capacity of the formwork. The results show that the stress of the side ribs is always at a high level during the whole loading process, and the maximum stress point (damage point) is at the pin hole directly below the loading point. Increasing the number of pins can improve the initial stiffness and ultimate bending moment of the semi-rigid connection. The influence degree of different geo metric parameters on the load carrying capacity of the formwork, in descending order, is the number of transverse ribs, the thickness of face plate and longitudinal ribs, the thickness of side and end ribs, the thickness of transverse ribs, and the height of side and end ribs.