摘要
为了研究沙漠区半刚性基层沥青混凝土路面受赋存气候环境影响,由温度应力作用引起路面横向隆起的半刚性基层力学响应,采用弹性薄板理论与复合材料力学理论,依据病害成因将路面横向隆起病害实体抽象简化为由材料性能、厚度不同的两块各向同性单层板所构成的四边简支、承受路面结构层自重的整体式双层板结构,建立半刚性基层发生横向隆起病害的拱胀力学模型。分析了基层结构在路面结构层自重和纵向均布压力作用下的挠度微分方程,并推演了其失稳的临界荷载表达式。结合路面的实际情况,认为路面结构的临界荷载取为(N_x)_(cr)=4π~2D/b^2较为合理;之后利用复合材料力学理论和弹性薄板理论分析并推导了整体式双层板的抗弯刚度表达式及中性轴位置的确定方法。结果表明:在纵向均布压力N_x≥(N_x)_(cr),基层结构将发生失稳破坏。
In order to study the mechanical response of the semi-rigid base of asphalt concrete pavement subjected to pavement transverse blowup caused by temperature stress under the influence of its occurrence climate environment in desert area, according to the disease cause, the disease entity of the transverse blowup is abstractly simplified as an integral double-layer plate structure with 4 edges simply supported, which is composed of 2 isotropic single-layer plates with different material properties and thicknesses and subjected to the gravity force of pavement structure, and a vaulted expansion mechanical model of the semi-rigid base which occurred transverse blowup phenomenon is established based on the theory of elastic thin plate theory and the theory of composite material mechanics. A deflection differential equation of base structure subjected to the gravity force of pavement structure and the longitudinal uniform pressure is analyzed, and a buckling critical load expression is derived. Combining with the actual situation of pavement, it is thought that the taking value of the critical load of pavement structure as （Nx ）cr =4π^2D/b^2is more reasonable. After that, the expression of the flexural rigidity and the method of determining the position of the neutral axis for the integral double-layer plate are analysed and derived by utilizing the theory of composite material mechanics and the theory of elastic thin plate. The result shows that the base structure will oeeur buckling failure if the longitudinal uniform pressure Nx 〉1 （ Nx ） cr.
出处
《公路交通科技》
CAS
CSCD
北大核心
2017年第7期8-13,共6页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51468047)
内蒙古自然科学基金项目(2015MS523
2016MS0531)
内蒙古交通运输厅交通科技项目(NJ2012-10)
关键词
道路工程
横向隆起
薄板理论
临界荷载
失稳破坏
road engineering
critical load
thin plate theory
transverse blowup
buckling failure
