混凝土板温度收缩钢筋配筋建议

Recommendations on Shrinkage and Temperature Reinforcements in Concrete Slabs

通过两端嵌固板的简单模型讨论了由混凝土干缩引起的受拉裂缝形成机理以及平均裂缝宽度、间距和数量的计算方法。利用该模型,通过算例比较中国GB50010-2002、美国ACI318-02、澳大利亚AS3600-1988三国规范关于混凝土板温度收缩钢筋的最小配筋率要求,并对此提出了设计建议。

The mechanism of shrinkage cracking is discussed with a simple member, which is fully restrained and subjected only to an axial restraining force caused by shrinkage, while a simple procedure is presented for the determination of the number and spacing of the cracks and the average crack width. With the simple model, some examples are shown to compare the provisions for minimum shrinkage and temperature reinforcement in GB 50010-2002 Code, ACI 318-02 Code and AS 3600-1988 Code. The results show that the provisions in GB 50010-2002 Code are too weak in comparison with the others. Finally, some recommendations are proposed.