動態彈黏塑性模式於鋪面分析之研究

Dynamic Analysis of Pavement by Using Elasto-Viscoplastic Model Department of Civil and Ecological Engineering

劉明樓(Ming-Lou Liu) ； 李端聖(Duen-Sheng Lee) ； 林智強(Chih-Chiang Lin)

《技術學刊》 24卷2期 (2009/06) Pp. 87-97

https://doi.org/10.29507/JT.200906.0001

摘要

使用合理的力學模式預測鋪面材料在荷重下之反應是爲鋪面研究者努力之焦點。因鋪面材料具有彈黏塑性之特性，過去已有不少學者使用此模式進行鋪面材料之模擬，但大都仍以實驗室材料行爲之模擬爲主。本研究擬將彈黏塑性動態有限元素程式與最佳化理論結合發展鋪面動態之反算與正算分析程式，並用於實際鋪面之結構分析。爲驗證所發展程式之正確性，本研究將使用美國聯邦公路總署所建立之LTPP (Long-Term Pavement Performance)資料庫中之資料作爲發展模式驗證之基礎。首先選擇六個試驗路段得其相關之資料，及進行反算分析求得發展模式之參數，並利用此參數進行鋪面結構分析，探討鋪面在不同車速反覆作用下之位移與應力反應相互間之差異。

關鍵字

彈黏塑性模式 ； 有限元素法 ； 動態反算分析

並列摘要

It is a major concern of highway research to use rational mechanical models to predict the responses of pavement under loading. It has been shown that pavement material has viscoplastic behavior. The viscoplasticity model has been used to predict the behavior of asphalt concrete material in the laboratory. However only a few studies combined viscoplastic measurement with a finite element program for the pavement structural analysis. In this study, the elasto-viscoplastic dynamic finite element is incorporated with an optimization approach for the backcalculation analysis, and the layer moduli and viscoplastic parameters are backcalculated and the results used for structural analysis. The comparison of the displacement and stresses are also studied for different traffic loadings. In order to verify the backcalculation program, the LTPP database developed by FHWA in the United State is used for verification. At first, six test pavement sections were selected from the LTPP database. The information in the database includes pavement structure information and time-history response data to FWD tests. The field model parameters are obtained from backcalculation and the results used for structural analysis of pavement under repeated traffic loading.

並列關鍵字

elasto-viscoplastic model ； finite element method ； dynamic backcalculation analysis