| 刘德军,岳清瑞,黄宏伟,薛亚东.TRC加固水工偏心受压结构的抗裂性能初探[J].水利学报,2016,47(1):101-109 |
| TRC加固水工偏心受压结构的抗裂性能初探 |
| Preliminary discussion on crack resistance of eccentric compression hydraulic structure based on TRC |
| 投稿时间：2015-04-07 |
| DOI：10.13243/j.cnki.slxb.20150382 |
| 中文关键词: 纤维编织网增强混凝土 偏心受压 裂缝 扩展规律 |
| 英文关键词: textile-reinforced concrete eccentric compression cracks extend rule |
| 基金项目:国家重点基础研究发展规划(973)项目(2011CB013800);国家自然科学基金项目(51508584) |
| 作者 | 单位 | | 刘德军 | 中冶建筑研究总院有限公司, 北京 100088
中国京治工程技术有限公司, 北京 100088
同济大学 岩土及地下工程教育部重点实验室, 上海 200092
同济大学 地下建筑与工程系, 上海 200092 | | 岳清瑞 | 中冶建筑研究总院有限公司, 北京 100088
中国京治工程技术有限公司, 北京 100088 | | 黄宏伟 | 同济大学 岩土及地下工程教育部重点实验室, 上海 200092
同济大学 地下建筑与工程系, 上海 200092 | | 薛亚东 | 同济大学 岩土及地下工程教育部重点实验室, 上海 200092
同济大学 地下建筑与工程系, 上海 200092 |
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| 中文摘要: |
| 为研究纤维编织网增强混凝土(Textile reinforced concrete,简称 TRC)加固偏心受压水工结构的抗裂性能,对 6 根偏压短柱进行试验,研究了配网率和前期受力对 TRC 控制偏心受压结构裂缝的影响,在此基础上,建立了TRC 加固下的偏心受压结构的裂缝扩展理论,进一步分析了裂缝的扩展规律。研究结果表明：对于一次受力结构,以基体材料开裂、受拉钢筋屈服为界限点裂缝呈现出 3 个扩展阶段;对于二次受力结构,滞后应变(前期受力历史造成)小于基体材料开裂应变时,裂缝扩展以加固点、基体材料开裂和受拉钢筋屈服为界限点呈现出 4 个扩展阶段,而当滞后应变大于基体材料开裂应变时,裂缝扩展以加固点、受拉钢筋屈服为界限点呈现出 3 个扩展阶段;在扩展阶段转变处,裂缝扩展速率(偏压荷载与裂缝扩展深度的比值)突增,但是在同一阶段内裂缝扩展速率逐渐减小;采用 TRC 可以有效地控制偏心受压结构主裂缝的发展,配网率越高,裂缝分布越均匀,条数越多,间距和扩展速率越小;前期受力对采用 TRC 抑制裂缝深度扩展的影响明显,而对抑制裂缝宽度扩展的影响较轻,总体而言前期受力历史越大,效果越差。 |
| 英文摘要: |
| To study crack resistance of eccentric compression hydraulic structures with Textile reinforced concrete, the experiment of six eccentric compression columns under different textile ratios and pre-loads was conducted. Based on the experiment result,the analytical theory of eccentric compression crack propagation was proposed, and then the crack propagation law was investigated. The results show that for structures under one-off load, the crack propagation phase is divided into three phases by cracking of matrix and yield of tensile steel. For structures under secondary load, when the post-strain (caused by preload) is smaller than cracking strain of matrix, the crack propagation is divided into four phases by applying TRC layer, cracking of matrix and yield of tensile steel; when the post-strain is greater than cracking strain of matrix,the crack propagation is divided into three phases by applying TRC layer and yield of tensile steel. In the transfer point of different phases,there is sudden increase for crack propagation rate (the ratio between eccentric compression load and crack extend depth). However,the crack propagation rate decreases gradually at the same stage. The propagation of eccentric tension cracks can be controlled effectively by using TRC, the higher the textile ratio, the more even the distribution of cracks, the smaller the cracks gap and growth rate. The influence of preload on controlling crack propagation at depth is obvious while it is slight at width,overall,the larger the preload,the worse the controlling effect. |
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