| 泵送混凝土结构施工期温控防裂研究 |
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| 引用本文： | 陈守开,吉顺文. 泵送混凝土结构施工期温控防裂研究[J]. 水力发电, 2011, 37(2) |
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| 作者姓名： | 陈守开 吉顺文 |
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| 作者单位： | 1. 华北水利水电学院水利学院,河南郑州,450011
2. 浙江省水利河口研究院防灾减灾研究所,浙江杭州,310000 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 针对泵送混凝土结构施工期易开裂的问题,从减小温差和约束出发,采用三维不稳定温度场和应力场的有限单元法及水管冷却离散算法,对某泵送混凝土结构施工期防裂方法进行数值计算分析.计算结果表明:表面保温性能越好,结构早期内外温差越小,表面拉应力也就越小,但拆模后表面和后期内部的拉应力也越大;吊空模板技术、缩短间歇时间和设置后浇带等施工方式对减小约束、防止结构后期裂缝有利;合理保温和水管冷却是防止裂缝产生的有效措施.
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| 关 键 词： | 泵送混凝土 闸墩 温度控制 温度场 应力场 防裂方法 |
Temperature and Crack Control of Pumping Concrete Structure during Construction |
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| Chen Shoukai,Ji Shunwen. Temperature and Crack Control of Pumping Concrete Structure during Construction[J]. Water Power, 2011, 37(2) |
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| Authors: | Chen Shoukai Ji Shunwen |
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| Affiliation: | Chen Shoukai1,Ji Shunwen2(1.College of Water Resources,North China University of Water Resources and Electric Power,Zhengzhou 450011,Henan,China,2.Department of Disaster Prevention and Mitigation,Zhejiang Institute of Hydraulics & Estuary,Hangzhou 310000,Zhejiang,China) |
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| Abstract: | For controlling the crack of pumping concrete structure in the period of construction,the effects of some control measures,which being considered from the perspective of decreasing temperature different and constraint,were simulated by the 3D-FEM of unstable temperature and stress fields and the discrete algorithm of cooling pipe for a pumping concrete project.The results show that:(a) the better the insulation,the smaller internal and external temperature different and surface tensile stress at early stage... |
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| Keywords: | pumping concrete pier temperature control temperature field stress field crack prevention measure |
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