跨越多檩条受力蒙皮抗剪性能数值模拟分析
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摘要
轻型钢结构中,常采用压型钢板作为围护结构。通过前人的试验研究和理论分析可知,如果和框架有可靠的连接,压型钢板在平面内具有相当可观的抗剪刚度和强度,被称作受力蒙皮作用。如果只将其作为刚度储备,不仅造成了材料上和经济上的浪费,还可能出现围护结构先于主体结构破坏的情况。
     现有的受力蒙皮组合体承受面内剪力的实用分析方法,是基于跨越少檩条且在波底连接的梯形压型钢板所构成的受力蒙皮结构推导出来的。而如今我国实际工程中,板型、连接形式、跨越檩条数目均发生了重大的变化。本文希望在数值模拟分析的基础上,将其结果与试验结果相比较,探求出一种可以替代试验进行系统分析的理论模型,以便开展新型蒙皮组合体抗剪性能的研究工作。本文主要开展了如下两个方面的工作:
     (1).针对已有的试验,采用通用软件ANSYS建模,模拟在波峰处进行连接的蒙皮体整体模型和边界条件,计算出跨越多檩条和跨越少檩条受力蒙皮的强度和抗剪刚度,并与试验结果进行对比分析。结果表明,所建模型总体上可以反映蒙皮体的工作特点,除刚度偏大外,与试验结果大体相符。
     (2).采用所建模型,分别改变边部连接件的间距(分别为200mm,300mm,400mm),压型钢板的厚度(0.6mm和0.8mm),板檩连接件的连接方式(分别为波峰连接与波谷连接)等参数,进行了参数分析。开展了新型蒙皮组合体的抗剪性能研究。分析表明,减小连接件的间距,增加压型钢板厚度,采用波谷连接方式,均可增加蒙皮体的抗剪承载力和刚度。蒙皮体中连接件的内力呈近似的线性分布,可以为简化分析提供依据。
Profiled sheets are widely used as enclosing elements in the light-gauge steel structures. According to the former experimental research and theoretical analysis, the in-plane shear rigidity and strength of the diaphragm, which composes supporting frames and profiled sheets adequately interconnected to each other, are considerable to resist horizontal loads, which are called“stressed skin action”. If this action is only taken as the reservation of the structural stiffness, it can not only result in both material and economic wastes, but also increasing the probability that the enclosing elements fail before the main structure collapses.
     The existing practical analysis methods are based on the trapizoidally-shaped profiled sheetings fastened on their valley and spanning few purlins. Whereas, the sections of profiled sheets, the forms of connection and the number of purlins that the diaphragm spans are all different in China at present. Based on the simulation analysis and compared with the experiment results, the paper hopes to find an analysis model in order to study the shear behavior of the new type diaphragm assemblies by the simulation analysis instead of tests. The following research work is developed in this paper:
     (1). The results for the existing tests method by using ANSYS software and simulation analysis of stressed skin diaphragm connected in wave crest spanning several purlins and few purlins have been calculated. The ultimate loads and shear rigidity curves were obtained, and compared them with the experiment results. It indicates that besides shear rigidities, simulation analysis could reveal the shear behavior of the stressed skin diaphragm which are crest connected with the main elements.
     (2). Based on the proposed model, the parameter analysis has been conducted by changing the parameters as follows: the arrangement interval of fasteners that interconnect sheeting and frame, from 300mm to 200mm to 400mm, and also the thickness of sheeting, from 0.6mm to 0.8mm, and the connection mode between sheeting and purlins, from wave crest connection to wave valley connection. The ultimate load and shear rigidity for different conditions are got respectively and then compare the simulation results mutually. The analysis indicates that the shear rigidity and ultimate load of stressed skin diaphragm could be increased by reducing the interval distance of the fasteners, increasing the thickness of the sheeting and adopting valley connection method. The shear force of fasteners presents linear distribution approximately, which provides the basis for simple analysis.
引文
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