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钢桥面环氧沥青混凝土铺装层Ⅰ型裂缝的断裂判据

, PP. 33-38

Keywords: 桥梁工程,环氧沥青混凝土铺装层,三点弯曲梁试验,断裂判据,Ⅰ型裂缝

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Abstract:

?基于桥面铺装的裂缝特点及断裂力学理论,引入应力强度因子K和J积分对环氧沥青混凝土三点弯曲梁试验进行分析,研究了温度和初始缝高比对其断裂特性的影响。根据不同断裂特性,计算得到了环氧沥青混凝土断裂韧性KIC和J积分临界值JIC;并研究了初始缝高比对断裂参数的影响,建立了环氧沥青混凝土K-J双参数联合断裂判据。结果表明:环氧沥青混凝土在-15℃~5℃时发生脆性断裂;在5℃~25℃时发生弹塑性断裂;所建立的断裂判据可为桥面铺装的抗裂设计提供依据,并为铺装结构的裂缝修补时机研究提供参考。

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