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工程力学  2015 

CFRP筋体外预应力加固T形截面混凝土梁短期挠度计算方法

DOI: 10.6052/j.issn.1000-4750.2013.07.0647, PP. 43-49

Keywords: T形截面混凝土梁,CFRP筋,体外预应力加固,有效惯性矩,短期挠度

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Abstract:

通过静力试验和理论分析,研究CFRP筋体外预应力加固T形截面混凝土梁在短期荷载作用下的使用性能,探讨短期挠度计算方法。结果表明,CFRP筋体外预应力加固梁的荷载-跨中挠度曲线呈三折线变化;跨中截面混凝土和CFRP筋的平均应变在梁体开裂之前沿截面高度基本呈线性变化,开裂后,CFRP筋的平均应变明显小于梁底混凝土的应变。基于试验结果,计算开裂刚度折减系数和CFRP筋粘结特征系数,考虑二次效应的影响,运用有效惯性矩法建立了CFRP筋体外预应力加固T形截面混凝土梁的短期挠度计算公式,可供实际工程设计参考。

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