交叉形的CFST柱的轴向压缩行为与钢条托架硬化
Yu Tao1, Chao Gong2, Sumei Zhang1
1School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen 518055, China.
Materials (Basel, Switzerland)
|June 10, 2023
概括
钢条杆固显著提高了十字形混凝土填充钢管 (CFST) 柱的柔性,而不会影响轴承负载能力. 这项创新提高了建筑物的抗震性能.
科学领域:
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
背景情况:
- 传统的混凝土填充钢管 (CFST) 柱提供高容量和抗震性能,但在建筑上可能不方便.
- 特殊形状的CFST柱 (例如,十字形) 解决了建筑上的限制,但显示了减少的混凝土封闭,特别是在凸的角落.
- 形角的封闭弱点对于特殊形状的CFST柱的承载能力和柔性至关重要.
研究的目的:
- 为了研究钢条杆杆硬化在提高十字形CFST柱的性能方面的有效性.
- 分析钢条托架节点间距和柱钢比对故障模式,承载能力和柔性的影响.
- 将实验结果与用于预测轴承承载能力的国际设计规范进行比较.
主要方法:
- 在轴向压缩下对12个十字形CFST柱进行实验测试.
- 系统变化钢条托架节点间距和柱钢比率.
- 对实验数据与六个全球设计代码的预测进行比较分析.
主要成果:
- 钢条固改变了钢板的曲从单波到多波,改变了混凝土故障从单段到多段的粉碎.
- 刚性并没有显著影响轴承能力,但可塑性得到了显著改善 (例如,可塑性系数从2.31增加到4.40,节点间距为140mm).
- 欧元代码4 (2004) 和CECS159-2018准确地预测了测试的柱子的轴承能力.
结论:
- 钢条托架硬化是一种有效的方法,可以提高十字形CFST柱的可塑性.
- 拟议的硬化技术改善了故障模式和整体结构性能.
- 已建立的设计代码为这些增强的CFST柱的轴承能力提供了可靠的预测.
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