分析钢-NC-UHPC复合梁的结构参数
Dawei Zhang1, Xiaogang Ma1, Huijie Shen1
1Shanghai Pudong Architectural Design & Research Institute Co., Ltd., Shanghai 201204, China.
Materials (Basel, Switzerland)
|August 26, 2023
概括
超高性能混凝土 (UHPC) 通过提高负矩区域的抗拉强度来改善钢-普通混凝土 (NC) 复合桥梁. 接口实验和有限元分析证实了工是一种可行的方法,混凝土厚度显著影响性能.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 结构工程 结构工程
背景情况:
- 钢常规混凝土 (NC) 复合桥通常会因为混凝土的低拉力强度而在负矩区域发生裂纹.
- 超高性能混凝土 (UHPC) 提供优越的抗拉性能,使其成为增强这些关键桥梁段的潜在解决方案.
研究的目的:
- 为了研究超高性能混凝土 (UHPC) -普通混凝土 (NC) 接口的粘合行为.
- 使用实验接口数据进行钢-NC-UHPC复合桥梁的参数分析.
- 评估复合桥应用的不同接口准备方法的有效性.
主要方法:
- 进行了接口实验,包括斜切削试验和弹性切削试验,以评估接口处理方法.
- 用有限元建模来分析复合梁的UHPC,NC和钢板组件中的应力分布.
- 实验结果被用来验证有限元模型的可靠接口模拟.
主要成果:
- 形接口方法表现出令人满意的性能,满足利用要求,平均剪切应力为10.29 MPa,曲拉伸强度为1.93 MPa,在故障时接口损坏最小.
- 混凝土厚度被确定为一个关键的设计参数,显著影响复合板内的应力分布.
- 有限元模型准确地模拟了接口行为,反映了由于设计参数变化的应力变化.
结论:
- 形接口处理是一种可行的和有效的方法,可以提高UHPC-NC复合桥梁组件的性能.
- 设计参数的变化,特别是混凝土厚度,对复合板的整体结构性能和应力分布产生重大影响.
- 经过验证的有限元模型为模拟和优化钢-NC-UHPC复合桥梁设计提供了可靠的工具.
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