動態車輪載重對鋪面績效影響的評估

王鈞平(Jun-Ping Wang)

指導教授 ： 張瑞宏

國立中央大學/工學院/土木工程學系/碩士(2007年)

摘要

本研究採用三維有限元素分析鋪面結構，分成二部份，一是靜態非均佈載重，另一是探討動態均佈載重。分別說明如下：
在靜態非均佈載重方面，續用前人將輪胎模型模擬成輪胎與鋪面表面的接觸應力分佈，模擬車輛停止時對鋪面的影響。
在動態均佈載重方面，使用均佈車輪載重，並讓載重隨時間改變作用位置，模擬車輛等速移動時對鋪面的影響。
以上兩種情形，再針對路基土壤材料彈塑性、不同含水量、以及覆土應力作用下，分析不同胎壓與載重作用下鋪面的反應。研究結果顯示，載重型式相同時，動態對鋪面的影響比靜態小；但由於均佈載重和非均佈載重會隨載重和胎壓的增加而造成差異增大，導致表面撓度和應變會有所差異。

關鍵字

靜態非均佈載重 ； 動態均佈載重 ； 彈塑性

並列摘要

In this study, 3-dimensional finite element model is used to analyze pavement response. Two parts are included in the analysis. On one hand, non-uniformly static contact stresses are considered; on the other hand, uniformly dynamic contact stresses are discussed.
In the condition of non-uniformly static contact stress, pavement structure effect of vehicle stop is simulated and the effect of tire pressure on pavement structure under traffic load was observed.
In the condition of uniformly dynamic contact stress, load positions are changed with time to simulate pavement structure effect of vehicle moving at uniform speed.
In the analysis, plastic material property, water content, and earth stress are used to analyze the pavement response under different loads and tire pressures. The results show that, when the loading type is the same, the dynamic influence is smaller than static. However, there are different between the results from uniform and non-uniform loads. Increasing load and tire pressure lead to different deflections of surface and strains.

並列關鍵字

non-uniformly static contact stress ； uniformly dynamic contact stress ； static-plastic property

參考文獻

[4].Sebaaly, P. E., and Tabatabaee, N., “Effect of tire parameters on pavement damage and load-equivalency factors ,” Journal of Transportation Engineering, ASCE, Vol. 118, No. 6, pp. 805-819 (1993).

[5].Kim, O. K., Bell, C. A., and Wilson, J. E., “Effect of increased truck tire pressure on asphalt concrete pavement,” Journal of Transportation Engineering, ASCE, Vol. 115, No. 4, pp. 329-350 (1989).

[6].Jones, A., “Tables of Stresses in Three-Layer Elastic Systems,” Buletin 342, Highway Research Board, pp. 176-214 (1962).

[18].AASHTO ，American Association of State Highway and Transportation Officials, Guide for Design of Pavement Structures (Volume1)

[21].Puppala, A. J., Mohammad, L. N., and Allen, A. (1999). “Permanent deformation characterization of subgrade soils from RLT test.” Journal of Materials in Civil Engineering, 11(4), 274-282.