桥面混凝土裂缝处防水层抗拉分析  

Tensile stress of waterproofing layer under concrete bridge deck pavement with cracks

作　　者：吴浩[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室

出　　处：《长安大学学报（自然科学版）》2008年第3期40-43,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200531800009)

摘　　要：为充分了解桥面防水层的层间拉应力的变化规律,研究桥面混凝土裂缝处防水层的抗拉性能,利用有限元法对混凝土桥面铺装结构建模,分析了在行车荷载作用下,桥面各铺装层参数对桥面防水层层间法向拉应力的影响规律,并针对桥面水泥混凝土调平层裂缝处的防水层,建立了防水层张力计算模型。计算结果表明：沥青混凝土面层与水泥混凝土调平层的模量和厚度、防水层厚度等参数的变化对层间法向拉应力影响很小;防水层模量是影响层间法向拉应力的主要因素,当防水层模量为10-50 MPa时,对层间法向拉应力的影响最大,防水层模量为50-300 MPa时影响较大,防水层模量为300-1 500 MPa时影响基本稳定。In order to master the direct tensile stress change rules of waterproofing layer under the asphalt pavement with cracks when the deck pavement bears the traffic loads, this paper analyzes the influences of the bridge deck pavement parameters on the direct tensile stress of waterproofing layer using the finite element method, and puts forward the model of calculating the tensile stress of waterproofing layer considering the deformation of the waterproofing layer on the cracks of concrete leveling layer under the traffic loads. The results show that： the influences of the thickness and modulus of asphalt pavement and concrete leveling pavement, and the thickness of the waterproofing layer on the direct tensile stress can be ignored, the modulus of waterproofing layer is the main influencing factor; when the waterproofing layer modulus is from 10 MPa to 50 MPa, the influence of the modulus on the tensile stress is the biggest; when the modulus is from 50 MPa to 300 MPa, the influence is bigger; when the modulus is from 300 MPa to 1 500 MPa, the direct tensile stress becomes stable. 3 tabs, 9 figs, 8 refs.

关 键 词：道路工程 防水层 拉应力 延伸率 模量 

分 类 号：U443.33[建筑科学—桥梁与隧道工程] U416.216[交通运输工程—道路与铁道工程]