Structure Optimization and Performance Analysis of Box-Type Support Joint of L-Shaped Partially Coated Steel-Concrete Composite Column
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摘要: 部分包覆钢-混凝土组合柱(简称PEC柱)在装配式建筑领域具有广阔的应用前景,近几年来在住宅领域中矩形PEC柱推广应用相对较多,但是L型PEC柱,尤其在框架-支撑结构中应用较少。L形PEC柱是一种新型的组合结构构件,因其肢厚与墙体同宽,避免了室内凸柱,因此在装配式钢结构住宅建筑中具有更好的应用前景,但是其箱型钢支撑节点构造较复杂,通常在项目设计中,节点域构造形式参照16G519《多高层民用建筑钢结构节点构造详图》中的钢结构节点构造确定,故对L型PEC柱与支撑的节点域构造及性能的研究尚待完善。以东升和府10号楼住宅项目为背景,依据“强节点、弱构件”抗震设计要求,按设防地震弹性分析要求提取YJK模型中构件内力:在1.3(D+0.5L)+0.3W+1.4Eh和1.0(D+0.5L)+0.3W+1.4Eh工况组合下分别取得支撑最大轴压力和轴拉力。根据该组合下的相关杆件内力开展箱型钢支撑节点传统方案及优化方案的有限元分析,基于有限元分析结果,分析节点域在受拉及受压下混凝土及主钢件应力分布及应力值,得出箱型支撑腹部传来的压力可以由L形PEC柱中填充的混凝土抵抗,传来的拉力可通过水平加劲板有效传递。在设防地震弹性工况组合下优化方案与传统方案应力分布及应力峰值基本一致,且节点域具有较高的安全裕量,满足“中震弹性”组合工况性能要求,优化后的L形PEC柱的箱型支撑节点结构性能未有明显下降,但给加工带来便利性,并提高质量可控性。
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关键词:
- 装配式 /
- 部分包覆钢-混凝土组合柱 /
- L形柱 /
- 有限元分析 /
- 钢结构
Abstract: Partially encased steel-concrete composite columns (PEC columns) have broad application prospects in the field of prefabricated buildings. In recent years, rectangular PEC columns have been widely used in the residential field, but L-shaped PEC columns, especially in frame-support structures, are less used. L-shaped PEC column is a new type of composite structural member. Because its limb thickness is the same as that of the wall, it avoids indoor convex columns, so it has better application prospects in prefabricated steel structure residential buildings. However, the structure of box steel support joints is more complicated. Usually in the project design, the connection structure is determined by referring to the steel structure joint structure in the 16G519 Multi-High-Rise Civil Building Steel Structure Joint Structure Detail Map. Therefore, the research on the connection structure and performance of L-type PEC column and support needs to be improved. Based on the background of Dongshenghefu 10# building residential project, according to the seismic design requirements of “strong joint and weak component”, the internal force of YJK model is extracted according to the requirements of elastic analysis under moderate earthquake: under the condition combination of 1. 3(D+0. 5L) +0. 3W+1. 4Eh, the maximum axial pressure of the support is obtained, and the maximum axial tension of the support is obtained under the condition combination of 1. 0(D+0. 5L) +0. 3W+1. 4Eh. According to the internal force of the relevant members under the combination, the finite element analysis of the traditional scheme and the optimization scheme of the box steel support joint is carried out. Based on the results of the finite element analysis, the stress distribution and stress value of the concrete and the main steel parts under tension and compression are analyzed. It is concluded that the pressure from the abdomen of the box support can be resisted by the concrete filled in the L-shaped PEC column, and the tension can be effectively transmitted through the horizontal stiffening plate. In addition, the stress distribution and stress peak of the optimization scheme are basically the same as those of the traditional scheme under the combination of medium earthquake elastic conditions, and the safety margin of the connection is good, which meets the performance requirements of the “medium earthquake elastic”combination conditions. The performance of the box-type support node structure of the optimized L-shaped PEC column has not decreased significantly, but it brings convenience to the processing and improves the quality controllability. -
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