沥青路面粘弹性层状体系力学响应分析

发布时间：2018-04-22 06:14

本文选题：沥青路面 + 粘弹性　；参考：《大连理工大学》2014年硕士论文

【摘要】：众所周知,沥青混合料是在力学特性上为典型的粘弹性材料,要想得到层状沥青路面结构在荷载作用下的力学响应,就必须对其进行粘弹性分析。本论文主要设计分析多层粘弹性沥青路面力学计算响应程序,首先根据层状弹性体系理论,根据层弹性沥青路面力学响应程序,可以求出在均布圆形荷载作用下力学响应。通过设计出的程序计算路面结构得出的结果与BISAR和KENLAYER计算得出的结果完全吻合。在进行多层粘弹性体系计算时需要考虑时间和温度对结构的影响时,通过弹性一粘弹性对应原则,可以求得在均布荷载作用下的多层粘弹性路面结构响应。在求解沥青混合料粘弹性响应时,沥青材料参数采用Prony系列表示。粘弹性沥青混合料的参数用相对应的Prony模型中的参数代替,得到在Laplace域内的弹性响应。再通过Laplace逆变换得到时间域内的响应。利用增量的卷积积分这个响应可以是任意时刻荷载的响应。使用该程序计算出来的弹性及粘弹性结果与有限元结果基本相同,且速度更快。该论文中的程序对于路面力学分析和设计提供了有效的工具。
[Abstract]:It is well known that asphalt mixture is a typical viscoelastic material in mechanical properties. In order to obtain the mechanical response of layered asphalt pavement structure under load, viscoelastic analysis must be carried out. This paper mainly designs and analyzes the mechanical response program of multi-layer viscoelastic asphalt pavement. Firstly, according to the theory of layered elastic system and the mechanical response program of layered elastic asphalt pavement, the mechanical response under uniform circular load can be obtained. The results obtained by the program are in good agreement with those obtained by BISAR and KENLAYER. When the influence of time and temperature on the structure is considered in the calculation of multilayer viscoelastic system, the response of multi-layer viscoelastic pavement under uniform load can be obtained by means of the elastic-viscoelastic correspondence principle. In solving the viscoelastic response of asphalt mixture, the asphalt material parameters are expressed by Prony series. The parameters of viscoelastic asphalt mixture are replaced by those in the corresponding Prony model, and the elastic response in Laplace domain is obtained. The response in time domain is obtained by inverse Laplace transform. By using the incremental convolution integral, the response can be the response of the load at any time. The elastic and viscoelastic results calculated by the program are basically the same as those of the finite element method, and the speed is much faster. The program in this paper provides an effective tool for pavement mechanics analysis and design.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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