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疲劳重复荷载下预应力混凝土梁的刚度退化规律

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Keywords: 桥梁工程,刚度退化规律,疲劳重复荷载,预应力混凝土梁,挠度,中和轴

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Abstract:

通过12片预应力混凝土梁的疲劳试验,对预应力混凝土梁的疲劳破坏形态进行了研究,对疲劳加载过程中预应力混凝土梁跨中挠度和混凝土应变随重复荷载次数的变化规律进行了重点分析,建立了基于实测挠度、压应变和中和轴高度的预应力混凝土梁刚度退化模型。结果表明疲劳上限值越大其刚度退化越明显,接近线性衰减随着疲劳上限值的降低,刚度衰减出现明显的相对稳定过程对于疲劳下限荷载相同的梁,动态割线刚度衰减曲线上终值基本相同,即非预应力筋发生疲劳断裂后梁体刚度还有48%~54%。

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