Study on Explosion Resistance of a New Type of Prefabricated T-Joint

A new type of prefabricated beam-column connection T-joint is proposed, which connects prefabricated beams and columns through components such as high-strength bolts and embedded steel plates. The deformation and mechanical properties of this new fabricated T-joint under explosion load were studied, and its reliability was analyzed. The finite element analysis software LS-DYNA was used to establish respectively the finite element models of cast-in-place and prefabricated T-joint under the same conditions of the same size and loading mode. The failure characteristics, stress and displacement analysis of T-joints with two different construction techniques under blast load are compared and analyzed. The results show that compared with the cast-in-place joint, the local damage caused by the explosion shock wave to the new prefabricated T-joint is more serious, but there is no large area of concrete collapse. In addition, under the two different construction technologies, the change rules of the steel bar stress and the joint displacement of the T-joint are basically the same. Therefore, it can be concluded that the new prefabricated structure has good explosion resistance.