上海大学学报(自然科学版) ›› 2012, Vol. 18 ›› Issue (6): 617-621.

• 数理化科学 • 上一篇    下一篇

移动载荷黏弹性Pasternak地基梁动力学响应

时伉丽, 丁 虎, 陈立群, 储德林   

  1. 1.上海大学 上海市应用数学和力学研究所,上海 200072; 2.上海大学 理学院,上海 200444;
    3.应用物理研究所 陆军军官学院,合肥 230031
  • 出版日期:2012-12-28 发布日期:2012-12-28
  • 通讯作者: 丁 虎(1978—),男,副研究员,博士,研究方向为复杂传输系统的振动分析与仿真等. E-mail:dinghu3@shu.edu.cn
  • 基金资助:

    国家杰出青年科学基金资助项目(10725209);国家自然科学基金资助项目(10902064);上海市重点学科建设资助项目(S30106);上海市青年科技启明星计划资助项目(11QA1402300);上海市教委科研创新资助项目(12YZ028)

Dynamic Response of Pasternak Beams on Viscoelastic Foundations to Moving Load

SHI Kang-li, DING Hu, CHEN Li-qun, CHU De-lin   

  1. 1. Shanghai institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;
    2. College of Sciences, Shanghai University, Shanghai 200444, China;
    3. Institute of Applied Physics, Army Officer Academy, Hefei 230031, China
  • Online:2012-12-28 Published:2012-12-28

摘要: 通过积分变换研究移动载荷激励下无限长黏弹性Pasternak地基梁在复数域上的封闭解.通过二维Fourier变换得到梁变形的Green函数,再运用Fourier逆变换得到梁变形的积分表达式,对解析表达式应用留数定理得到系统在复数域上的封闭解.数值研究梁和地基的参数对梁变形的影响,表明Pasternak基础中的黏性和剪切力对梁变形的影响明显.采用样条插值对积分解析表达式求数值解,验证封闭解的有效性.

关键词: 二维Fourier变换, 梁, 留数定理, 黏弹性地基, 移动载荷

Abstract: Dynamic response of Pasternak beams on viscoelastic foundations to a moving load is proposed by integral transformation in this paper. The Green’s function of the beam is obtained by means of two-dimensional Fourier transform. Deflection of the beam is represented using inverse Fourier transform. The theorem of residue is then applied to represent the generalized integral in the form of contour integral in the complex plane. Studies on the influence of parameters of beam and subgrade are provided with illustrations. It is clear that viscosity and shear modulus of subgrade have significant effect on the deflection of the beam. Numerical solution to the integral expression is studied with spline interpolation, showing that the obtained closed-form solution is correct.

Key words:  viscoelastic foundation, infinite beam, moving load, residue theorem, two-dimensional Fourier transform

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