WIM-BASED VEHICLE LOAD MODELS FOR URBAN HIGHWAY BRIDGE

Abstract

WITH THE RAPID DEVELOPMENT OF CHINA'S ECONOMY, MANY LONG-SPAN BRIDGES HAVE BEEN BUILT AND PUT INTO SERVICE. VEHICLE LOAD HAS BEEN CHANGING YEAR BY YEAR IN TERMS OF GROSS VEHICLE WEIGHT (GVW), WHEELBASE AND TRAFFIC VOLUME, ESPECIALLY THE OVERLOAD OF HEAVY VEHICLES, WHICH IS A MAJOR CHALLENGE TO THE SAFETY AND DURABILITY OF BRIDGES. IT IS NECESSARY TO ESTABLISH THE VEHICLE LOAD MODEL THROUGH THE MEASURED TRAFFIC DATA FOR ACTUAL TRAFFIC CONDITIONS OF THE LOCAL BRIDGE. IN THIS STUDY, THE WEIGH-IN-MOTION (WIM) DATA COLLECTED FROM AN OPERATIONAL LONG-SPAN URBAN HIGHWAY BRIDGE LOCATED IN WUHAN, CHINA, WERE USED TO ANALYZE THE STATISTICAL CHARACTERISTICS OF VEHICLE LOADS. ON THE BASIS OF THE TYPES OF VEHICLES, (1) CONSIDERING THE DOUBLE OR MULTIMODAL GAUSS DISTRIBUTION CHARACTERISTICS OF THE GVW, THE EXPECTATION MAXIMIZATION (EM) ALGORITHM WERE USED TO ESTIMATE THE STATISTICAL PARAMETERS OF THE GAUSS DISTRIBUTION; (2) THE GENERALIZED EXTREME VALUE DISTRIBUTION (GEV) WAS USED TO DEVELOP THE STATISTICAL MODEL OF THE VEHICLE LOAD EXTREME VALUE; (3) THE VEHICLE LOAD EXTREME VALUES IN THE DESIGN REFERENCE PERIOD OF THE URBAN HIGHWAY BRIDGE WERE ESTIMATED BY THE EXTREME VALUE TYPE I DISTRIBUTION; (4) ACCORDING TO THE WEIGHT AND SPACING OF THE AXLE, A STATISTICAL FATIGUE VEHICLE LOAD MODEL FOR THE URBAN HIGHWAY BRIDGE WAS PRESENTED BASED ON THE MINER LINEAR ACCUMULATED DAMAGE HYPOTHESIS AND THE EFFECTIVE FATIGUE DAMAGE PRINCIPLE.