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桥梁短期实测数据修正高强混凝土收缩徐变模型与长期挠度预测

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Keywords: 桥梁工程,收缩徐变修正,应变辨识,混凝土箱梁桥,挠度预测

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Abstract:

为了解大跨径预应力连续箱梁桥高强混凝土的收缩徐变规律,预测其长期变形,在箱梁跨中埋置测量传感器,直接测量混凝土的收缩应变,通过增量运算理论分离出混凝土的徐变应变,对于具体桥梁的C55高强混凝土实测数据显示,现行规范的收缩徐变模型总体上会低估高强混凝土的收缩作用,而高估徐变作用。用短期实测数据修正后的混凝土收缩徐变模型预测桥梁恒载下的长期变形,由两种类型修正式的挠度估算值与实测值的比较可知,其预测精度受混凝土短期实测应变数据的完整性﹑测量精度及修正式与实测数据吻合程度的影响。

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