桥面铺装材料设计参数对铺装层受力影响

桥面铺装材料设计参数影响铺装层受力状态,通过力学有限元计算,分析了铺装层材料设计参数对铺装层受力状态影响及其变化规律。分析结果表明,沿用一般路面沥青混合料设计方法不能适应桥面铺装层的实际受力状态,是造成沥青铺装层常见破坏类型的原因,应根据铺装各层不同的受力特点设计与选择经济、合理的铺装层材料,如嵌挤密实型改性沥青混合料、增强纤维沥青混凝土、改性沥青SMA等优质铺装层材料,从而使得铺装各层总体上更加协调,更能适应桥面板的变形,改善铺装层的受力状态,延长铺装层的使用寿命,也为同类型桥面铺装设计提供一些有益的参考。

Effects of Material Design Parameter on Mechanical States of Bridge Deck Pavement

Bridge deck pavement is suffered from more complicated stress than ordinary pavement,and mechanical state of the paving layers is influenced by material design parameters.After mechanical calculation,the effect of material design parameters on mechanical state and variational regularity of the pavement is analyzed.Analytical results indicate that following the design method of traditional HAM can not adapt actual mechanical state and easily results in usual distress types on asphalt concrete paving.The economical and reasonable paving materials should be designed and choosed according to mechanical characteristics,such as multilevel dese built-in modified HMA,fibre-reinforced asphalt concrete and modified SMA,to harmonize paving layers as a whole,adapt distortions of bridge deck,improve mechanical states of the paving layers,last service years,and offer some helpful references for similar bridge deck pavement design.