Experimental study of the seismic performance of pile groups with integrated building-bridge structure in liquefiable soils: a case study

Abstract The integrated building-bridge structure system exemplifies integrated railway stations in China and has emerged as a new structural approach in recent years. This paper presents a case study on large shaking table tests that explore various seismic responses of a pile group system based on the Kunming South Railway Station. The study focused on the dynamic characteristics of the soil and pile-superstructure. Findings indicate that the pile damage is primarily on the side facing the direction of vibration, with the middle pile experiencing greater damage than the corner pile. Hysteresis is observed in the growth of pore pressure ratio during the liquefaction of saturated soils. Both the bending moment and ground pressure on the pile increase with the degree of liquefaction. The greatest pile bending moment occurs at the interface between liquefied and non-liquefied soil layers. During seismic activity, side piles facing the vibration direction experience increased seismic surcharge loads, while the center piles experience smaller loads due to the isolation effect of the side piles.