Analysis of Creep Effect of Cable-stayed Bridge Considering Temperature and Humidity Changes

Abstract

In order to study the influence of environmental temperature and humidity changes on the creep effect of large-span concrete cable-stayed bridges, taking the Mysterious Valley Lancang River Bridge as the background, combined with the measured data of environmental temperature and humidity at the bridge site, and based on the standard model, a creep correction model considering the time-varying of temperature and humidity was established, and compared with the standard model with constant temperature and humidity. The research results indicate that after considering the time-varying effects of temperature and humidity, the displacement and internal forces of the main beam, the displacement and internal forces of the bridge tower, and the cable forces of the inclined cables caused by creep effects will continue to increase. Neglecting the changes in environmental temperature and humidity will underestimate the impact of creep effects. Adopting a modified model that considers the time-varying effects of temperature and humidity can improve the prediction accuracy of long-term creep effects in large-span concrete cable-stayed bridges, which is beneficial for bridge design, construction process monitoring, and later operation and maintenance.