摘要
针对大型厂房混凝土除了受地基约束外还受到侧向约束的特点,对其开裂机理进行了分析,认为强约束是导致此类结构开裂的重要因素之一.运用水管冷却混凝土温度场和应力场的有限元计算方法,利用反演辨识获得的热学参数,对某工程机电厂房肘管段混凝土结构进行了仿真预测分析,通过对各种温控防裂方案的比较,认为采取表面保温和内部水管降温相结合的温控措施,同时配合低温混凝土或跳仓浇筑技术对预防类似工程开裂具有很好的参考价值.
According to the actual instance that concrete of large scale powerhouse was constrained not only by foundation but also by surrounding concrete; mechanism of concrete crack was analyzed; strong constraint was thought to be the main factor of concrete cracking. Temperature and stress fields of elbow section concrete of specific project were calculated with help of water cooling temperature and stress fields FEM; and parameters were calculated based on back analysis. It is concluded that the combinations of heat preservation on surface, pipe cooling in concrete and sequence placement are good measures to prevent cracking. The results have great reference significance to similar concrete projects in the future.
出处
《三峡大学学报（自然科学版）》
CAS
2010年第4期29-33,共5页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金资助项目(50579080
50539010
50779010)
关键词
约束
混凝土
裂缝
跳仓浇筑
constraint
concrete
cracking
sequence placement
