混凝土桥面铺装层的多重断裂分析  

Analysis of Multiple Cracking of Concrete Bridge Overlays

作　　者：谭茶生[1] 曾庆敦[2] 

机构地区：[1]华南理工大学建筑学院,广东广州510640 [2]华南理工大学交通学院,广东广州510640

出　　处：《广东工业大学学报》2007年第1期61-65,共5页Journal of Guangdong University of Technology

基　　金：国家自然科学基金(10372032);广东省自然科学基金(031394)

摘　　要：借鉴复合材料力学的分析方法,对桥面板和桥面铺装层组合体系建立一种分层剪滞分析模型,研究了混凝土公路桥中组合体截面受负弯矩作用下铺装层的多重断裂问题,求出了普通混凝土和钢纤维增强混凝土铺装层的裂纹间距或裂纹密度,所得结果与某工程实例中普通混凝土桥面铺装层的破坏状况较吻合.计算结果表明,裂纹密度与远场施加荷载有关,施加荷载愈大,裂纹密度愈大,当施加荷载达到或超过某值时,铺装层会出现等间距的饱和裂纹群.Using the analytical methods of composite mechanics for reference, a layering shear-lag model is established for the system composed of bridge deck ply and overlay. The multiple cracking problem of concrete bridge overlays for concrete highway bridges under minus moment is studied. Then the crack spacing or density of both conventional and steel fiber-reinforced concrete bridge overlays has been calculated. The results obtained are in a relatively good agreement with the failure situation for an engineering example. The results calculated also show that the crack density is related to the applied stress at far field, the higher the applied stress is the larger the crack density is, and a cluster of saturation cracks of approximately equal interval distance in concrete bridge overlays emerges when the applied stress reaches or exceeds a value.

关 键 词：混凝土 钢纤维增强混凝土 桥面铺装 多重断裂 裂纹密度 剪滞分析 

分 类 号：U414.1[交通运输工程—道路与铁道工程] O346.1[理学—固体力学]