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Abstract
Interchange is essential in a metro network. Regarding the seismic performance, a series of large-scale shaking table tests were performed on an interchange station. The interchange station was composed of a two-story section rigidly connected to a perpendicular three-story section, leading to an abrupt change of stiffness in the conjunction area. Synthetic model soil (a mixture of sand and sawdust) and granular concrete with galvanized steel wires were used to model the soil–structure system. The seismic motion was input along the transversal direction of the two-story structure, including white noise and sinusoidal seismic excitations. Parallel tests of a single two-story station were correspondingly carried out as a contrast. Test data recorded by accelerometers and strain gauges are presented. The bending strains of the columns measured in the interchange station were found to be smaller than those in the single station. The concentration of the longitudinal strain was observed near the conjunction. Insights on the seismic response of the interchange station are provided.
Highlights
Cross interchange stations constitute essential components of the metro system, and the expanding metro grids in modern cities lead to the growing demand of their construction
It compares the accelerations recorded in the acceleration array SA-3, which was only 0.3W away from the interchange station
Prior numerical and analytical studies have documented the necessity of addressing the joint effect on seismic performance for underground structures with abrupt stiffness changes
Summary
Cross interchange stations constitute essential components of the metro system, and the expanding metro grids in modern cities lead to the growing demand of their construction. There are various analysis studies available in the literature, ranging from closed-form solutions [7,8,9,10] to simplified pseudo-static analyses [11,12,13] and numerical full dynamic modeling [14,15,16]. The last category of methods, numerical full-time analysis, is considered as the most accurate method for the seismic analysis of underground structures [13], provided that some of the most important aspects (e.g., soil nonlinearity, relative soil–structure stiffness and soil–structure interface) can be modeled appropriately. In all of the above analysis methods, experimental modeling has been a key factor for calibrating and validating the models and to provide evidence on the mechanisms and factors affecting the response
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