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发表于 2004-4-12 03:22:00
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来自 美国
回复: 【讨论】ABAQUS在计算车辆荷载作用下路基路面动力响应问题时该怎么考虑
Regarding to "1.车辆荷载:采用子程序Dload来模拟,具体将车轮荷载简化为一在路面相应区域移动的荷载"
As to my knowledge, it is very hard for the computation resource available nowadays to consider both the plasticity of materials and hundreds of loading applications caused by moving vehicles. The plastic response of pavements under moving vehicles is usually simulated by an equivalent static loading. More details about this topic can be found in the following references:
1. "avement Analysis for Moving Aircraft Load"
by T.D. White, M, (Prof., School of Civ. Engrg. Purdue Univ., W. Lafayette, IN 47907), S. M. Zaghlou, (Head, PMS Unit, Dubai Municipality Rd. Dept., Dubai Municipilaity, U.A.E.), G. L. Anderton, (Res. Engr. Pavements Div., Geotech. Div., UASE WES, Vicksburg, MS 39180), and D. M. Smith, (Res. Engr. Pavements Div., Geotech. Div., UASE WES, Vicksburg, MS 39180) Journal of Transportation Engineering, Vol. 123, No. 6, November/December 1997, pp. 436-446 (Downloading available)
2. ID: 00676547
Title: USE OF THREE-DIMENSIONAL, DYNAMIC, NONLINEAR ANALYSIS TO DEVELOP LOAD EQUIVALENCY FACTORS FOR COMPOSITE PAVEMENTS
Author(s): Zaghloul, SM; White, TD; Kuczek, T
Language: English
Journal Title: Transportation Research Record
Issue: 1449
Publication Date: 00/00/1994
Pagination: pp 199-208
ISBN: 0309060567
ISSN: 03611981
Features: FIGS: 10 Fig. TABS: 1 Tab. REFS: 24 Ref.
Publisher/Corporate Author(s):
Abstract:
Asphalt overlays are frequently used to improve the serviceability of a deteriorated concrete pavement. The asphalt overlay has a significant influence on the concrete pavement's behavior and response to loads. Most highway agencies approximate the behavior of composite pavements to that of asphalt or concrete pavements. In fact the 1993 AASHTO design guide suggests that concrete pavement load equivalency factors (LEFs) be used to assess the effects of traffic on composite pavements. This is an approximation and has not been validated with field measurements or realistic analytical procedures. From a structural point of view an asphalt overlay of a concrete pavement should have a significant effect on the response of the composite pavement. A logical approach for the development of composite pavement LEFs is presented. These LEFs were developed for a study of permissible overloads and are based on total deformation, elastic and plastic, at the pavement surface. A three-dimensional dynamic finite-element mesh (3D-DFEM) method of analysis was used to analyze the composite pavements. The 3D-DFEM was verified in two steps for asphalt and concrete pavements: first for static, linear elastic analysis and then for dynamic, nonlinear analysis. Moving loads and realistic material models were used in the analysis. |
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