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钢-混凝土组合梁加宽混凝土旧桥试验

, PP. 35-43

Keywords: 桥梁工程,钢-混凝土组合梁,试验研究,横向分布系数,承载力

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Abstract:

?对2根钢-混凝土组合梁加宽混凝土T梁构件进行试验(共分4种弹性工况与1种破坏工况),量测并分析了试件的荷载、挠度、反力及应变,观测了试件的裂缝发展情况。对弹性工况下的挠度、支座反力横向分布规律进行了研究,并对破坏工况下的构件极限抗弯承载力进行了理论分析。结果表明:荷载作用在L/4与L/2处时挠度横向分布规律相同,其分布系数与刚性横梁法、修正刚接梁法计算结果吻合良好;荷载作用在L/4与L/2处时支座反力横向分布规律相同,其分布系数与杠杆法计算结果吻合良好;破坏工况下组合梁与混凝土T梁呈现出典型的弯曲破坏,构件抗弯承载力等于组合梁与混凝土T梁抗弯承载力之和。

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