Serviceability considerations for guideways and bridges

Abstract

Serviceability limit states such as fatigue, cracking, corrosion, permanent deformations (kinking), deflection, and vibration are considered. A probability-based approach to develop design criteria is proposed. Load history is represented by load histogram and ADTT (average daily truck traffic) volume. Criteria for the selection of acceptable serviceability levels can be derived from the available test data, bridge surveys, and theoretical studies. Simple format is suggested for the code, with a characteristic value representing load effect and an allowable stress or force representing the structural ability to absorb damage. In the case of deflection and vibration, human perception threshold levels are used as the acceptance criteria. Key words: bridges, damage accumulation, design criteria, limite states, serviceability.