| 李静*,王亚林,赵致俊,王昌,刘力搏,刘晨.再生大骨料自密实混凝土梁裂缝开展机理研究[J].实验力学,2019,34(2):224~230 |
| 再生大骨料自密实混凝土梁裂缝开展机理研究 |
| Study of cracking propagation mechanism of self-compacting concrete beam with recycled large aggregate |
| 投稿时间：2017-12-23 修订日期：2018-02-03 |
| DOI：10.7520/1001-4888-17-278 |
| 中文关键词: 再生大骨料 自密实混凝土 随机骨料模型 数值模拟 裂缝开展 |
| 英文关键词:recycled large aggregate self-compacting concrete random aggregate model numerical simulation crack propagation |
| 基金项目:青岛市科技发展计划科技惠民专项(15-9-2-116-nsh)资助 |
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| 中文摘要: |
| 再生大骨料自密实混凝土梁的裂缝开展机理作为梁结构可靠性设计的理论基础，具有重要的工程意义。本文对不同再生大骨料取代率的再生大骨料自密实混凝土梁进行了数值仿真模拟，分析了再生大骨料自密实混凝土梁的裂缝开展情况和荷载-挠度曲线。结果表明，采用随机骨料模型对再生大骨料自密实混凝土梁进行裂缝开展模拟的方法可行；裂缝主要沿着再生大骨料和自密实混凝土交界面扩展，少部分经过再生大骨料；不同再生大骨料取代率的再生大骨料自密实混凝土梁的裂缝开展机理相同；相比自密实混凝土，再生大骨料自密实混凝土梁的承载力降低，脆性增强。 |
| 英文摘要: |
| As the theoretical basis for reliability design of beam structure, crack propagation mechanism of recycled large aggregate self-compacting concrete beam is of great engineering significance. In this paper, numerical simulation of recycled large aggregate self-compacting concrete beam with different big recycled aggregate replacement rate was carried out, and the crack propagation and load-deflection curve of recycled large aggregate self-compacting concrete beam were analyzed. Results show that the method of random aggregate model is feasible for the crack propagation simulation of recycled large aggregate self-compacting concrete beams. The cracks mainly propagate along the interface between recycled large aggregate and self-compacting concrete, and a few of cracks pass through the recycled large aggregate. The crack propagation mechanism of recycled large aggregate self-compacting concrete beam with different big recycled aggregate replacement rate is the same. Compared with self-compacting concrete, the bearing capacity of recycled large aggregate beam decreases, and the brittleness increases. |
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