Damage Model Test of Prestressed T-Beam Under Explosion Load

Bridge is an important infrastructure in road traffic, which may bear the accidental load of terrorist attacks and transportation accidents and explosions in its life cycle. In this paper, three groups of prestressed T-beam model tests were carried out in response to the terrorist explosion on the bridge deck. The results show that with the increase of explosive equivalent, the failure degree of prestressed steel reinforcement is aggravated, the number of anchorage falling off is increased, and the normal steel reinforcement evolved from failure to fracture. The fracture shape of the web of prestressed T-beam was “X”, and the failure form on both sides of the web was roughly “I” shape. The number of concrete cracks increased, and the crack depth and the size of the crack increased. The local failure mode of T-beam evolved from seismic collapse to penetrating failure, and the residual bearing capacity of prestressed T-beam gradually decreased.