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通过有限元方法,分析了不同类型桥面防水粘结层的受力特点及其剪应力对铺装层各种参数(包括厚度、模量、水平荷载及胎压等)的敏感性,得到了粘结层剪应力角度变化范围,提出了桥面粘结层的抗剪强度要求计算公式。通过变化室内斜剪试验剪切角度(25°~65°),得出了剪切角度变化时粘结层抗剪强度随温度变化的规律。研究结果表明:桥面铺装厚度和水平荷载是影响层间剪应力与剪切角度大小的主要因素,粘结层材料的抗剪性能随着温度和剪切角度的增大迅速降低,具有一定厚度的低模量防水卷材粘结层对铺装层抗剪是不利的。建议通过比较不同场合桥面粘结层的抗剪强度测试值和理论计算值,判定粘结层的粘结效果,用于指导防水粘结层的选择。
The finite element method was used to analyze the stress characteristics of different types of bridge deck waterproofing and the sensitivity of shear stress to various parameters of pavement (including thickness, modulus, horizontal load and tire pressure) Bond layer shear stress angle range, proposed bridge deck bond shear strength requirements formula. By changing the shear angle (25 ° ~ 65 °) of the indoor oblique shear test, the law of the shear strength of the adhesive layer with temperature is obtained when the shear angle changes. The results show that the thickness and horizontal load of deck pavement are the main factors affecting the interlaminar shearing stress and shearing angle. The shearing resistance of the bonding layer material decreases rapidly with the increase of temperature and shearing angle, The thickness of the low modulus waterproofing membrane adhesive layer is detrimental to the pavement shear. It is suggested that the adhesive effect of the adhesive layer can be judged by comparing the shear strength test values and the theoretical calculated values of the adhesive layer on the bridge deck to guide the selection of the waterproof adhesive layer.