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为了研究重载及超载对混凝土箱梁桥桥面铺装的影响,以沪杭高速公路拓宽改建工程段高架箱梁桥为实例,采用有限元方法建立节段整桥铺装复合结构模型,以桥面不平度引起的超载车辆动荷载作为外载激励,对比分析了动荷载与静荷载作用下的铺装层受力特性。分析结果表明,在动荷载作用下,墩顶对应的铺装层表面位置较易出现开裂破坏,跨中对应的铺装层较易出现剪切破坏。考虑不平度的超载动力作用对铺装拉应力峰值的影响程度明显小于考虑水平刹车制动力的超载交通荷载作用情况,但是动载作用对剪应力峰值的影响却明显大于静载作用的计算结果;考虑刹车制动力的超载交通荷载较易引起铺装层开裂破坏,而超载动力作用较易引起铺装层剪切破坏。
In order to study the influence of overloading and overloading on the deck pavement of concrete box girder bridge, taking the elevated girder bridge of Shanghai-Hangzhou Expressway widened and reconstructed project as an example, the finite element method The dynamic load of overloaded vehicles caused by bridge roughness is taken as external excitation, and the mechanical properties of pavement under dynamic loads and static loads are comparatively analyzed. The analysis results show that under the dynamic load, the surface of pavement corresponding to pier top is prone to cracking and failure, and the pavement corresponding to the span is prone to shear failure. The influence of overloading dynamic load on roughness of pavement tensile load is obviously less than that of overload traffic load considering horizontal braking force, but the effect of dynamic load on the peak shear stress is obviously greater than that of static load. The overload traffic load considering the brake braking force may cause the cracking of the pavement more easily, while the overloading dynamic effect may cause the shear damage of the pavement.