混凝土楼盖结构设计中后浇带的留设及封闭时间探讨

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基金项目:

教育部高等学校骨干教师项目资助

DISCUSSION ON PLACEMENT AND CLOSURE TIME OF POST-POURED STRIPS OF CONCRETE FLOOR STRUCTURES

1.
1. Engineering College of Shanxi University Taiyuan 030013;
2.
2. The Key Lab on RC/PC Structures of Ministry of Education,Southeast University Nanjing 210096

摘要: 在混凝土楼盖结构中,通过设置后浇带,释放混凝土的大部分收缩变形。后浇带的留设间距与支承结构的刚度、混凝土的收缩量和后浇带的封闭时间有关。后浇带封闭时间越晚、贯穿后浇带的钢筋面积越少,后浇带宽度越大,后浇带处钢筋的约束拉力就越小,有利于发挥后浇带的作用,增强抗裂效果。
- 后浇带 /
- 计算温差 /
- 裂缝 /
- 收缩 /
- 温度应力
Abstract: Post-poured strips are often placed to release most of the shrinkage strain for concrete floor structures.The distance between post-poured strips depends on stiffness of supporting structures,shrinkage value and closure time.The later is the closure time,the smaller is the continuous bar area and the greater the width is,the smaller the restraining tensile force in bars of post-poured strip will be.It is advantageous to realize the function of post-poured strip and strengthen its crack resistance.
- post-poured strip /
- computational temperature difference /
- crack /
- shrinkage /
- thermal stress