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基于有效惯性矩的钢纤维高强混凝土梁刚度计算方法

, PP. 62-68

Keywords: 桥梁工程,高强混凝土梁,疲劳试验,钢纤维,挠度,刚度

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Abstract:

?在13根钢纤维高强混凝土梁等幅疲劳试验基础上,探讨了等效应力比、钢纤维类型、钢纤维体积率、钢纤维掺入范围和混凝土强度对钢纤维高强混凝土梁挠度和刚度的影响,建立了基于有效惯性矩的钢纤维高强混凝土梁刚度计算模型及公式。结果表明:在高强混凝土梁中掺入钢纤维提高了梁的截面刚度,使疲劳荷载作用下高强混凝土梁跨中挠度减小15%~61%;基于有效惯性矩的钢纤维高强混凝土梁挠度和刚度计算结果与试验结果吻合较好。

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