Quality Processes for Bridge Analysis Models

Presented By: Serhan Guner, University of Toledo Description: The design of bridges often involves the use of FEA models of varying degrees of complexity, including: - 1D line elements - 2D line elements (with/without shell elements) - Linear-elastic finite elements - Nonlinear finite elements A variety of analysis software are used to analyze concrete structures. This process can be complex with a large number of input parameters and output data. The engineer must understand the limitations of the analysis method and software, possess experience in developing analysis models with proper approaches and assumptions, and correctly interpret the results. A simple check of the program input values is not an adequate way of ensuring the accuracy and validity of these models. Quality assurance (QA) and quality control (QC) are two essential processes for the quality management of analysis models. Verification and validation (V&V) play a critical role in the QA/QC process. The objective of the current NCHRP Project 20-05, Topic 54-11, Quality Processes for Bridge Analysis Models, is to identify and document state department of transportation (DOT) practices related to the quality processes for bridge structural analysis models. The study investigated processes for: - Identifying appropriately qualified staff - Choosing an appropriate analysis method and software - Verifying and validating the software - Modeling with proper approaches and assumptions - Verifying the analysis results, and - Reconciling discrepancies between independent models. Fifty state and District of Columbia DOTs participated in the study. In addition, five state DOTs were examined as Case Studies, including California, Colorado, Iowa, Louisiana, and New York DOTs. This presentation will present the findings with an emphasis on V&V processes.