混凝土接口应力在施工中的刚性框架的演化定律及其对最终承载能力的影响
Yonghui Fan1, Chao Luo1, Yin Zhou1
1State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Sensors (Basel, Switzerland)
|August 12, 2023
概括
这项研究调查了桥在施工过程中的混凝土应力演变. 分段倒导致了显著的应力差异,与单次倒相比,最终承载能力降低.
科学领域:
- 土木工程 土木工程是指土木工程.
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
背景情况:
- 桥梁中主环的混凝土封装对于结构完整性至关重要.
- 了解施工过程中的压力演变是防止故障的关键.
- 之前的研究还没有完全解决细分倒置对应力分布和最终容量的影响.
研究的目的:
- 为了研究在刚性框架桥的混凝土封装过程中,环和段接口的应力演变.
- 分析这种应力演变对最终承载能力的影响.
- 为了比较细分倒装与单个倒装方法.
主要方法:
- 一个10:10尺度模型实验天龙桥 (600米原型).
- 光纤应变传感器用于在施工过程中收集混凝土应变数据.
- 安西斯APDL有限元分析模拟两个模型 (细分和单倒装) 的各种负载条件下的最终承载能力.
主要成果:
- 在封装后,在横截面中观察到显著的应力差异 (网络应力高达地板应力的76%,屋顶应力<20%).
- 在工作平面交叉点 (地板:60-70%,网:40-60%,屋顶:0-5%) 显著的跨段应力差异.
- 与单个倒装相比,分段倒装降低了最终承载能力的19.16% (中跨度负载) 和5.23% (1/4跨度负载).
结论:
- 在细分混凝土封装中压力分布不均会对弧形环的最终承载能力产生负面影响.
- 建筑方法显著影响应力演变和结构性能.
- 调查结果强调了在分段桥梁施工中考虑应力分布的重要性.
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