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原文传递 Sensitivity Analysis and Evaluation of the Loadrate Load Zone Procedure for Implementation by Texas Department of Transportation; Final research rept

题名：	Sensitivity Analysis and Evaluation of the Loadrate Load Zone Procedure for Implementation by Texas Department of Transportation; Final research rept
作者：	McNerney, M. T.; Collier, D. S.
关键词：	Sensitivity analysis; Pavement loading; Road sufficiency ratings; Pavement strength; Pavement deflections; Computer programs; Texas; Service life; Highway maintenance; Loading(Mechanical); Subgrades
摘要：	A previous research study developed the LOADRATE program to replace current procedures that required three different computer programs for analyzing load-zoned roads in Texas. The Texas Department of Transportation (TxDOT) was not satisfied with the results of the LOADRATE analyses of load-zoned roads when compared with analyses using current procedures. Differences between the two methods resulted in the need for an independent analysis of the LOADRATE program and procedures. The purpose of this study was to evaluate the code and analysis procedures of LOADRATE and make recommendations as to whether the Department should abandon the current analysis procedures and implement the LOADRATE program. This report summarizes the findings of a study of the LOADRATE program code and analysis procedures. The study conducted parallel evaluations of several load-zoned roads using both the LOADRATE and current TxDOT procedures. The results verified previous TxDOT findings that indicated that LOADRATE was very liberal in lifting load restrictions on roads that current analyses showed should remain restricted in gross vehicle weight. This study reviewed the coding of the LOADRATE and LDATA programs and made many corrections and improvements to the existing code. The study also conducted sensitivity analyses of the variables used as input to the programs and compared the results of back-calculation of base and subgrade modulus with the Modulus computer program. The study specifically reviewed the method of predicting rutting using traffic and FWD deflections in the LOADRATE program. The results of the study found significant differences in the results of analyses with LOADRATE versus current procedures that could not be corrected in this limited study. The rutting model unique to this program appears to be the primary cause for the vast difference in the analyses of load-zoned roads. There are significant differences in the calculation of base and subgrade modulus, but this error should have resulted in LOADRATE being more conservative in its results. This study recommended that LOADRATE procedures and computer program not be implemented by TxDOT for statewide analysis of load-zoned roads.
总页数：	79p
报告类型：	科技报告