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Research on Lateral Stiffness of Embedded Wall Board Steel Frame Structure
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摘要: 钢结构因其具有工厂化生产、抗震性能良好、可回收利用、绿色环保等优点，被广泛地运用于装配式建筑之中。在钢结构建筑中，内嵌围护墙板常作为钢框架结构建筑填充墙使用，但在现有的结构设计理论中，一般采用周期折减系数考虑内嵌围护墙板对钢框架结构抗侧刚度的影响，有时会造成模拟框架抗侧刚度与实际相差较大，不利于工程精细化设计，因此需要深入研究内嵌围护墙板对钢框架抗侧刚度的影响。在该背景下，为进一步研究内嵌围护墙板与钢框架在离散连接情况下，不同影响因素引起的钢框架结构抗侧刚度的变化，运用ABAQUS有限元软件建立带内嵌蒸压加气混凝土（ALC）墙板钢框架的结构模型，考虑了ALC墙板与框架梁连接、与框架柱连接以及与框架梁柱共同连接时，连接节点数量和墙板与钢框架的刚度比对带内嵌围护墙板钢框架结构（Embedded Wallboard Steel Frame Structure，简称EWSF结构）抗侧刚度的影响。
结果表明：EWSF结构的抗侧刚度与无墙板的钢框架相比有较大幅度的提高，根据不同的连接条件，其提高程度分别可达4倍以上；多参数分析结果显示连接工况的变化对EWSF结构整体抗侧刚度有较大的影响，随着连接节点数量的增多，ALC墙板与框架梁连接比与框架柱连接时EWSF结构初始抗侧刚度的提高更加明显；与ALC墙板和框架梁柱分别连接时的情况相比，ALC墙板与框架梁柱共同连接对提高EWSF结构抗侧刚度的效果更加显著；连接节点数量较少时，梁柱连接变化对EWSF结构抗侧刚度的影响较小；EWSF结构的抗侧刚度随墙板与钢框架刚度比的减小而增大。基于连接节点数量和刚度比等影响因素对结构初始抗侧刚度影响的模型分析和理论推导，分别引入墙板与钢框架完全刚接时结构初始抗侧刚度影响系数β和离散连接时结构初始抗侧刚度的影响系数α，提出了该结构初始抗侧刚度计算表达式，其计算结果与有限元分析结果相吻合。Abstract: Steel structure buildings have the characteristics of factory production, good seismic performance, recyclability, environmental protection and other characteristics. They are widely used in prefabricated buildings. In prefabricated steel structure buildings, embedded wallboards are often used as filling walls for steel frame structures. However, in the existing structural design theory, the period reduction factor is generally used to consider the influence of embedded wallboards on the lateral stiffness of steel frame structures. Sometimes, this causes a large difference between the simulated lateral stiffness of the frame and the actual stiffness, which is not conducive to refined engineering design. It is necessary to further study the influence of embedded wallboards on the lateral stiffness of steel frames. Therefore, in this context, in order to further study the changes of the lateral stiffness of steel frames caused by different influencing factors in the discrete connection between embedded wallboard and steel frame, ABAQUS finite element software was used to establish a structural model of steel frame with embedded autoclaved lightweight concrete(ALC) wallboard. The influence of the number of connection nodes and the stiffness ratio of the wallboard to the embedded wallboard steel frame structure(referred to as EWSF structure) was considered when connecting the ALC wallboard to the frame beam, the frame column, and the frame beam column together.
The results show that the lateral stiffness of EWSF structure is greatly improved compared with the steel frame structure without wallboard. According to different connection conditions, the improvement degree can reach 4 to 6 times. The results of multi parameter analysis show that the change of connection conditions has a greater impact on the overall lateral stiffness of EWSF structure. With the increase of the number of connection nodes, the initial lateral stiffness of EWSF structure when the ALC wallboard is connected to the frame beam increases more significantly than when it is connected to the frame column. Compared with the case when the ALC wallboard and the frame beam column are connected separately, the effect of the joint connection of the ALC wallboard and the frame beam column on improving the lateral stiffness of EWSF structure is more significant. When the structure has fewer connection nodes, the change of beam column connection has little effect on the lateral stiffness of EWSF structure. The lateral stiffness of EWSF structure increases with the decrease of the stiffness ratio of the embedded wallboard to the steel frame. Based on the model analysis and theoretical derivation of the influence of factors such as the number of connection nodes and the stiffness ratio on the initial lateral stiffness of the structure, the influence coefficient β of the initial lateral stiffness of the structure when the embedded wallboard is fully rigid connected to the steel frame and the influence coefficient α of the initial lateral stiffness of the structure when the embedded wallboard is discrete connected are introduced respectively. And the formula for calculating the initial lateral stiffness of the structure is proposed. The calculation result is consistent with the finite element analysis result, which can provide a certain reference for engineering design. -
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