DYNAMIC RESPONSE OF THE MULTI-STOREY BUILDING SUBJECTED TO BLAST LOADING IN UNDERGROUND TUNNEL

The dynamic response of three types of a multi-storey building (including a framed structure with raft foundation, a frame-shear wall structure with raft foundation, a framed structure with basement) under a blast loading generated by an in-tunnel explosion is investigated numerically. The ABAQUS software is used to establish a three-dimension tunnel-soil-multi-storey building coupling model considering the material nonlinearity of the concrete and soil. The accuracy and validity of the coupling model set up with the ABAQUS software are verified by a comparison between its results and those from a LS-DYNA coupling model. A large number of example analyses are carried out to systematically disclose the response characteristics of the aboveground building subjected to an in-tunnel explosion in three groups of cases, i.e. the one-way and two-way tunnel layouts, the change of a distance between the building and the explosion-happening tunnel, and the change of the explosive position along the tunnel’s longitudinal axis. The results show that another parallel tunnel set between the building and the explosion-happening tunnel has an obstructive effect on the blast waves’ propagation in soil, resulting in a distinct decrease of peak responses of aboveground structures; all types of buildings have an increasingly violent response when the explosive position is closer to the structure, while their difference of anti-explosion capability from one another become more remarkable during this course.