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工程力学  2014 

正常使用状态下RUHTCC梁的弯曲变形预测

DOI: 10.6052/j.issn.1000-4750.2013.08.0712, PP. 183-189

Keywords: UHTCC,正常使用状态,挠度,截面惯性矩,中和轴高度

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Abstract:

该文以有效截面惯性矩为参数,提出了正常使用状态下钢筋增强超高韧性水泥基复合材料(RUHTCC)梁的挠度简化计算方法。与钢筋混凝土梁不同,RUHTCC梁需要考虑受拉区UHTCC在弯曲开裂后的承载能力,理论分析表明基于拉压区面积矩平衡与基于内力平衡且假定压应力线性分布所得的中和轴高度计算公式不同,而后者符合中和轴的物理意义。采用UHTCC的非线性拉、压本构模型以及受压区边缘压应变对应的割线模量,得到基于内力平衡的RUHTCC梁完全开裂截面的中和轴高度以及惯性矩公式。其次,有效惯性矩公式中的常系数m修正为随配筋率变化的函数,得到适用于RUHTCC梁的有效惯性矩公式。采用该文提出的挠度简化计算方法,对比预测与实测的屈服前荷载-挠度曲线,两者基本一致。

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