Evaluation of Design Parameters for AASHTO Rigid Pavement Design

• Main Authors: Shen, Yu Ren, 沈育仁
• Other Authors: Zhou, Jia Bei
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/52315731420590748817

碩士 === 國立臺灣大學 === 土木工程學研究所 === 83 === Because of the complexity of the 1986 AASHTO Pavement Design Guide for rigid pavement design, it is very difficult to match all design parameters with the local conditions. In Taiwan, pavement designers were used to using the recommended values from the Guide while the local data are not available. The purpose of this thesis is to evaluate the appropriate values of AASHTO design parameters: the initial present serviceability index(P0),the joint transfer coefficient(J), and the overall standard variation(S0). Furthermore, this thesis also provides theses three parameters practical procedures for long-term study. The field study shows that the P0 in Taiwan is around 3.3 less than the recommended value in AASHTO guide(4.5). It is obvious that the large difference between real and design P0 will result in low level of design reliability. The mechanistic model KENSLABS was used to analyze the joint load transfer coefficient J. It was found that the J value of Taiwan National Freeway 3 was about 3.77, which was larger than 3.2(the recommended value in AASHTO guide). Because the Freeway 3 was newly opened to traffic, further study is recommended. In order to overcome the difficulty of collecting large amount of data for evaluating S0 for the procedure of AASHTO Guide, this study develops two 'backcalculating' models for evaluating S0. Both models compare computed pavement performance with measured performance to backcalculate the adequate S0. Al- though these two models can significantly simplify the procedure of evaluating S0, long-term monitoring data are still required. This thesis explores the importance of calculating the AASHTO design parameters, and provides practical procedures of evaluating P0, J, and S0. It is recommended that the future study can be carried on for improving the rigid pavement design.