This report contains the findings of a study to develop a process for validating bridge design and analysis software. The report describes the research effort leading to the recommended process and discusses the application of this process to software evaluation, design comparisons, and specification review. The material in this report will be of immediate interest to software developers, bridge-design specification writers, and bridge engineers. The CD-ROMs contain the testbed of bridges with well defined parametric inputs and outputs developed in National Cooperative Highway Research Program (NCHRP) Project C12-50. The objective of this project was to develop a methodology for bridge-design software validation. This objective has been achieved with the development of "Process 12-50," a systematic method of comparing and evaluating bridge design and analysis software. Process 12-50 also provides a standardized report format for presenting and comparing results for a specific bridge design and a powerful method for formally reviewing specification changes. All common tables necessary to implement Process 12-50 and software to aid in viewing the databases are also included on the CD-ROMs. (Author/publisher) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rpt_485c1-4.pdf
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