Load Model Experiment of Prestressed Concrete Continuous Girder Bridge Subjected to Explosion above the Deck

Prestressed concrete continuous girder bridge is one of the most widely used bridges in China's highway engineering, No anti-explosion protection design was conducted. Once the explosion load occurs, it will cause heavy casualties and property loss. A scaled model of 2 × 8 m two span prestressed concrete continuous T-girder bridge was designed and constructed, and the field explosion testing was carried out. Combined with the numerical simulation method, the interaction between the explosion shock wave and the prestressed concrete continuous T-girdcr bridge is studied, and the distribution characteristics of the explosion load (shock wave overpressure 6-impulse)over the bridge deck were analyzed. It can be concluded that the explosion overpressure and impulse over the bridge deck show nonlinear distribution along the longitudinal & transverse direction. The overpressure distributions along the transverse and the longitudinal directions are basically consistent, and the impulses over the bridge deck along the transverse direction is smaller than that of the vertical direction. When the height of the blast core is constant, the explosion load of the bridge increases sharply with the decrease of the proportion distance. When the proportion distance is constant, with the increase of the explosive equivalent, the overpressure peak value at the bottom of the core is unchanged, but the peak values of the overpressures at the other positions on the bridge deck significantly increase. The overpressure peak value formula for the bridge deck blasting load model is proposed, which can provide reference for the anti-explosion protection design of girder bridge. © 2022 Xi'an Highway University. All rights reserved.