仓储结构新型可拆换高延性梁-柱节点低周性能研究

发布时间：2018-01-07 06:00

本文关键词：仓储结构新型可拆换高延性梁-柱节点低周性能研究　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：大型组装式钢货架作为当今主流的仓储结构体系,在各个行业应用广泛,具有广阔的前景。但其采用的分离式柱卡节点在承载和耗能方面性能较差,使得货架结构抗震能力薄弱,存在极大的安全隐患。因此,对传统节点进行改进和研究,提出新型的货架梁-柱节点,对货架结构承载能力和抗震能力的提高具有重要的理论意义和工程应用价值。本文在传统分离式节点的基础上,提出一种合理高效的新型可拆换高延性梁-柱节点。新型节点结合快速插接和螺栓连接两种节点的优势,大幅提升货架节点的刚度和延性,有效增强其承载性能和抗震性能。同时,可拆换的节点形式能够促进全镀锌货架的推出,废除传统喷塑的防锈工艺,使货架的加工绿色环保无污染,提高生产效率,大幅度提升仓储结构的结构性能和可持续发展能力。本文结合不同的工艺做法,共研究两类五种货架梁-柱节点。首先,依据相关规范规定,设计和制定节点双悬臂梁试验装置及方案,对五种节点进行低周反复荷载试验研究；其次,通过试验结果和现象的整理分析,对五种节点的承载性能和抗震性能进行详细研究；接着,采用有限元对五种节点进行数值模拟,与试验结果对比,进一步研究货架梁-柱节点的性能,总结其主要影响因素；最后,对新型梁-柱节点进行参数化分析,研究各个因素的影响关系,为接下来的工程应用和研究改进提供参考依据。通过上述研究,主要结论如下：1.分离式节点的破坏模式由于立柱处对穿螺栓的设置而不同。传统分离式节点的破坏模式为上、下卡舌撕裂脱落；增设立柱对穿螺栓后,卡舌受力和柱卡变形得到改善,破坏模式为横梁梁端裂缝断裂。2.整体式节点的失效破坏主要发生在横梁与牛腿连接处,由于连接形式的不同而不同。新型整体式节点由于横梁梁端螺栓脱出而失效破坏,采用对穿螺栓连接横梁的整体式节点由于横梁梁端对穿螺栓剪断而失效,采用压铆螺母连接横梁的整体式节点易因横梁梁端压铆螺母脱落而失效。3.五种节点均有一定程度的滑移性,弯矩一转角滞回曲线均有不同程度的“捏缩”。对于传统分离式节点,立柱对穿螺栓的设置能够有效改善正反向受力的不对称性,节点在承载性能和抗震性能上均有显著提高。4.整体式柱卡实现了节点的整体性,改善节点的受力性能,显著提升节点的承载能力、延性以及能量耗散能力,对节点抗震性能的提高起到关键作用。5.横梁和牛腿的连接方式对整体式节点的承载性能和抗震性能有重要影响。在横梁梁端翼缘开螺纹孔,通过顶面和底面螺栓与其连接,使整体式节点在受力和抗震耗能等方面表现最好。
[Abstract]:Large assembled steel shelf storage structure as the current mainstream, widely used in various industries, and has broad prospects. But the separation column card node performance in bearing and energy dissipation is poor, the shelf structure seismic capacity is weak, there is a big security risk. Therefore, improvement and Research on the traditional node. A new shelf beam column node, which has important theoretical significance and application value for the bearing capacity and seismic capacity of shelf structure improved. Based on the traditional separated nodes, puts forward a new type of detachable reasonable and efficient for high ductility of beam column joints. The new node combined with rapid insertion and bolted two a node's advantage, significantly enhance the shelf node stiffness and ductility, effectively enhance the bearing capacity and seismic performance. At the same time, the node form of detachable zinc can promote the whole goods Frame of the launch, the abolition of the traditional spray antirust technology, the processing of green pollution-free shelf, improve production efficiency, greatly enhance the structure performance of storage structure and the ability of sustainable development. Based on the different techniques and practices, a total of two categories of five kinds of rack beam column node. First of all, according to the relevant regulations. The design and development of node double cantilever beam test device and program for cyclic test of five kinds of nodes; secondly, through experimental results and phenomenon analysis, bearing capacity and seismic performance of five kinds of nodes in detail; then, using the finite element numerical simulation of five kinds of nodes, comparison with the test results, further study on shelf performance of beam column joint, summarized the main influencing factors; finally, the parametric analysis model of beam column joint, influence of various factors, as the ground To provide reference for engineering application and research down improvement. Through the above research, the main conclusions are as follows: 1. the failure mode of separated nodes because of the post of bolt set and different. In the traditional failure mode split node on the card under the tongue torn off; set up by column on the wear bolt, tongue by card the force and deformation of column card is improved, failure mode of end crack fracture of.2. monolithic node for beam beam damage mainly occurs in the joint of beam and corbel, due to different connection forms and different. New type of integral node due to beam bolt failure and Liang Duan out of the whole node type, bolted beam due to wear beam beam end failure to wear bolt cut, using integral node pressure riveting nut connected beams due to beam beam end pressure riveting nut off failure of.3. five has a certain degree of node Slip, moment rotation hysteresis curves have different degrees of "pinch". For the traditional separate column node, can effectively improve the asymmetry of positive and negative stress on the wear bolt set, significantly improve the bearing capacity and node in the seismic performance of both.4. monolithic column card of the whole node. Improve the mechanical properties of the nodes, significantly enhance the bearing capacity of the node, the ductility and energy dissipation capacity, the seismic performance of nodes to improve the connection key role of.5. beam and corbel of integral node load have important influence on the performance and seismic performance. Threaded holes in the beam beam through the top and bottom flange. The bottom surface of the bolt is connected, so that the overall best performance in the joint force and energy dissipation and so on.

【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391

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