Temperature field and deformation of high-speed maglev prestressed overall guideway beam

The coupling deformation between guideway beam and vehicles is one the most important factors in the design high-speed maglev guideway by considering the thermal-mechanical interaction effects. The solar radiation distribution field in Qingdao city was presented, based on the heat transfer theory, the summer meteorological data in Qingdao and the semi empirical formula of sunshine radiation. And a three-dimensional model of the prestressed overall guideway beam for Qingdao maglev test line was proposed in ABAQUS. The temperature distribution of the longitudinal, vertical, and transverse temperature difference of the girder was analyzed, according to the transient state analysis method. The corresponding temperature gradient curves were fitted based on the exponential function. The numerical simulation of thermal-mechanical coupling on guideway beam was carried out by using the sequential thermal-mechanical coupling method. According to simulation results, the maximum vertical temperature gradient of the guideway beam appears at 14: 00 PM. Under the thermal-mechanical coupling effects, the deflection of the guideway beam is the smallest at 14:00 PM, and its value is 3.150 mm. The largest deflection is 01:00 AM, and its value is 3.336 mm. The extreme value of lateral displacement appears at 11: 00 AM and 15: 00 PM, its values were 1.237 mm and 1.515 mm respectively. The prestressed rebars have a significant influence on the deflection of the guideway beam. The deflection of the guideway beam with a prestress level of 1 302 MPa is 23.96% smaller than the one without prestress. The prestressed rebars have no influence on the lateral deformation of the guideway beam. The lateral deformation of the guideway beam with a prestress level of 1 302 MPa is only 0.2% different from the one without prestress. © 2022, Central South University Press. All rights reserved.