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钢筋混凝土梁受压区加固后新增混凝土高度分析

, PP. 60-65

Keywords: 桥梁工程,新增混凝土高度,增大截面法,钢筋混凝土梁,受压区

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Abstract:

针对受压区增大截面加固后的组合截面受弯构件正截面承载力计算公式并没有对其新增混凝土高度的限制条件进行说明,对钢筋混凝土梁受压区加固后新增混凝土高度进行分析。考虑新增混凝土的应变超前效应,对加固后钢筋混凝土梁进行应力应变分析,得到界限破坏的3种形式。对每种界限破坏形式利用截面材料的应力应变关系,得出加固后的钢筋混凝土梁极限承载力计算公式。通过引入截面有效系数和承载力可提高系数以及程序得出新增混凝土高度对其承载力的影响,并进一步得出新增混凝土高度的限制条件。分析结果表明,原截面高度与加固后截面高度比尽量要超过0.8,这样避免原构件的截面受拉钢筋应力很快达到屈服状态,发生少筋脆性破坏的情况。

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