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https://trb-annual-meeting.nationalacademies.org/registration

Weight-In-Motion (WIM) Analysis for New Jersey Bridges for Establishing Various Live Load Models for Design and Bridges Management Task

The goal of the study is to analyze NJ’s recorded weigh-in-motion (WIM) data for establishing various live load models for the design and evaluation of bridges. In addition, the objective is to calibrate the load factors based on the latest edition of the “Manual of Bridge Evaluation (MBE)” for Specialized Hauling Vehicles (SHVs) to avoid (if possible) load posting of bridges. The main tool to analyze the live load effect on bridges is utilizing reliable WIM data. Although there is a gigantic, collected WIM database for New Jersey, there is a need for a reliability-based analysis to update and improve the live load models for bridges in the state of New Jersey as follows: • Permit trucks with various axle configurations will be identified using WIM data analysis. This will provide an opportunity for NJDOT to add additional live load models (i.e., live load models exceeding the gross weight of more than 80,000) for load rating and evaluate its process for issuing or granting annual permits. • Validate NJ’s existing LRFD permit load model (i.e., 8-axle & 200 kips) and make necessary changes if needed. Different live load factors would be established for both new bridges and existing bridges. • Analyze NJ’s existing steel bridge data (e.g., Rolled steel I girder with E and E’ fatigue category) to identify the risk of load-induced fatigue cracking. • Analyze NJ’s existing steel bridge data (e.g., welded plate girder with skew angle equal to or greater than 30 degrees with staggered cross frames/diaphragms) to identify the risk of distortion-induced fatigue cracking. • Validate NJ’s existing load factor of 1.30 for operating rating of SHVs to avoid (if possible) load posting of bridges.