The Research On The Heat-structure Coupling Performance Of Cable-stayed Bridge Under Fire

Cable-stayed bridge is now rapidly becoming the fastest growing and most competitivetypes of bridges because it is span the capacity, structure, light novel, energy-saving advantagesof bridge project. With the rapid economic development, cable-stayed bridge has become animportant and indispensable transport channel. As the volume of traffic has also led to asubstantial increase in vehicle fires consider revising. For most of the bridge of fire, the vehiclecaused by fire in the majority, including large trucks, buses and trains. Among them, thetransport flammable tanker in the event of a fire, caused by the bridge structure will be a greatthreat, especially for large cable-stayed bridge, as traffic throat, after the fire, it is bound to stopit for a period of time use, resulting in huge economic losses. On the other hand, a largecable-stayed bridge under some serious fire, the repair will bring great difficulty, and somedamage or even impossible to repair.In order to prevent the tanker fire in the event of the enormous impact of cable-stayedbridge. Masangxi Bridge as background, the use of ANSYS to establish a model. The work formechanical properties of cable-stayed bridge model is researched at room temperature and hightemperature:1. It uses ANSYS building and analysis the model of cable-stayed bridge. Only itsself-weight at room temperature and the main beam bridge deck pavement loads imposed.Displacement of the whole cable-stayed bridge, Von. Mises stress, axial and axial stress contourplot When a fire occurs in the middle of the bridge beams, traffic standstill.Therefore, vehicleload is static load in the main beam. When the fire occurred at side of the beam of cable-stayedbridge. The first situation is more dangerous.2. The temperature field of the main beam and cable-stayed is analyzed. Through thetemperature field contours can visually see the distribution of their temperature. Heating curve isdrawn to see the heating of the main beam and cable-stayed. In the fire, cable-stayed warmingfaster and more easily damaged.3. The mechanical properties of cable-stayed bridge under high temperature applying thermal-structural coupling in finite element was studied. Then the “fire resistance time” was defined,and the refractory time-diameter relationship curve was drawing out.This thesis provides some reference for the future study of the components at fire resistancelimit and mechanical properties under normal and high temperature.