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受压区高度对碳纤维加固桥梁的有效性影响

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Keywords: 桥梁工程,碳纤维加固,抗弯承载力,受压区高度,梁高,配筋率

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Abstract:

采用理论分析及有限元模拟2种方法,研究了《公路桥梁加固设计规范》中粘贴碳纤维抗弯承载力公式的连续性及承载力提高问题,得出了几种情况下的ΔM-h、ΔM-ρ曲线。结果表明混凝土受压区高度x不同的2个承载力计算公式,当x等于ξfb时仅在梁高小于500mm或配筋率为1.6%左右时连续,而其余情况则发生跳跃;当ξfbh大于等于x和小于ξbh0时,对梁高小于600mm的构件采用粘贴碳纤维提高抗弯承载力效果并不明显,而当梁高及原构件配筋率愈大时加固效果才愈明显;当x小于ξfbh时,计算得的加固后截面承载力却小于加固前的承载力,这显然与实际情况并不相符,因而需对此做进一步地深入研究。

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