轮胎与钢桥面铺装接触力学分析

为进一步分析钢桥面铺装的真实受力特性,对轮胎与钢桥面铺装的接触力学行为进行了研究.通过建立轮胎模型,对轮胎接地压力进行计算,并与实测数据对比验证了轮胎接触模型的准确性;通过建立轮胎与桥面接触模型,对不利荷载位置时桥面铺装的力学响应计算与分析,得出铺装层竖向位移、铺装层顶弯拉应力、粘结层剪切应力的分布特性,指出桥面铺装典型病害产生的力学机理;通过对设定的一组铺装层计算模量对应的铺装层力学响应极值进行计算,得出铺装层弯拉劲度模量变化对铺装层力学响应的影响规律,并对比分析了轮胎荷载与均布荷载对结算结果的影响作用.结果表明：在等量荷载条件下,采用轮胎与桥面接触模型计算出的铺装层最大层顶反弯应力、粘结层最大剪切应力均明显大于采用均布荷载的计算结果,其中：铺装层层顶反弯应力增幅约为5%,粘结层剪切应力增幅约为9%.采用轮胎与桥面接触模型进行钢桥面铺装设计会更为安全.

Gontact mechanical analysis for tire and deck pavement contact

In order to analyze the actual stress of deck pavement,the contact mechanical behavior of tire and deck was studied.Tire finite elements＇ model was built,tire ground pressure was calculated and compared with the measured data,the accuracy of tire model was tested.The contact model of tire and deck was built,pavement mechanical response under adverse load location was calculated,mechanical distribution character and typical damage mechanism of pavement were analyzed.Pavement mechanical response corresponding to a set of calculation moduli was calculated,the influence discipline of pavement bend stiffness modulus to pavement stress was obtained,the difference of calculation results for tire load was contrasted to uniformly distributed load.The results show that the pavement stress under the tire load pattern is obviously more disadvantageous than that under the uniformly distributed load,even though the two loads are the same quantity in the sum.In the contact model of tire and deck,the tensile stress on pavement top is increased about 5% more and the shear stress in bonding layer is increased about 9% compared with those in the uniform load.Therefore,the method which is employed by the tire and deck contact model is safer and more reasonable for steel bridge deck pavement design.