摘要
由路桥不均匀沉降产生的桥头跳车将导致桥头路面受力显著增大和路面提前破坏。通过建立7自由度整车运动动力模型和路桥过渡段路面-桥面形状几何模型,采用Wilson-θ方法求得了车辆经过不平顺的路桥过渡段所产生振动的时程。计算结果表明,桥头跳车中汽车后轮的最大动荷载明显大于其静荷载,且其最大动荷载并不一定仅发生在桥头搭板范围内,而在下桥方向一定长度范围内。对于长度小于100 m的桥梁,桥梁长度对路面所受最大动力荷载的大小和位置均有较大影响。因此常规仅对桥头搭板进行加强的设计方案是不够的,还应根据桥梁的长度不同,对桥头一定长度范围内路面就跳车所产生的动力荷载进行深入分析。
Vehicle bumping created by differential settlement of bridge approaches to bridge decks leads greatly variation of wheel force on pavement and damage the pavement ahead of time.The time-amplitude of vehicle vibration running in bridge approaching section is obtained by establishing 7 degree of freedom vehicle model and pavement-deck shape geometric model of bridge approaching section with wilson-θ method. Calculation results show that maximum rear wheel load on pavement cause by vehicle bumping is far more beyond the static load. Further more, the maximum dynamic load not surely occurs in the approach slab section as usual tmderstanding, but occurs in somewhere ranged in some distance of depart direction of the bridge.As to the bridge short than 100 m, the amplitude and occurring location of the maximum dynamic load both are effected greatly by the length of bridge. So the conventional design that just reinforce the bridge approaches deck is not enough, more detail analysis including dynamic load analysis and pavement reinforcement according to the different bridge span length should be done to the pavement that located in the bridge approaches sections.
出处
《公路交通科技》
CAS
CSCD
北大核心
2007年第7期39-43,共5页
Journal of Highway and Transportation Research and Development
