Experimental Study on Seismic Response of a Large‐Span and Column‐Free Subway Station in Composite Strata

Tingjin Liu,Xinwei Tang,Weixing Xu,Siyuan Zheng

doi:10.1155/2019/8412390

Tingjin Liu, Xinwei Tang + Show 2 more

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https://doi.org/10.1155/2019/8412390

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Abstract

In this paper, a shaking table test was conducted to investigate the seismic response of the large‐span and column‐free subway station in the upper‐soft and lower‐hard strata. The acceleration of the structure and the soil, the dynamic soil pressure, and the strain response of the subway station were obtained and analyzed. The results demonstrate the reasonable test design as the boundary effect was eliminated. The seismic response of the structure and soil became more severe as the acceleration amplitude of the input motion increased. It is indicated that possible shear damage of the soil and irreversible plastic deformation of the structure might have occurred as the test proceeded. The soft clay had a greater effect on the structure than that of the artificial rock. For the model structure, the tensile strain amplitude in the support region was larger than that in the midspan region. The support regions of the roof slab, lateral wall, and middle slab were the vulnerable components of the model structure during earthquakes.

Highlights

With the merits of improving space utilization efficiency and architectural aesthetics, a new type of subway station, a large-span and column-free subway station, is to be built in Guangzhou Metro Line 11 for better services and more comfortable travel. e large-span and column-free subway station has a platform width larger than 10 m, in which the columns of the public area are eliminated, providing more space and visual enjoyment for passengers
As the large-span and column-free subway station is to be built in composite strata with an upper soft zone and lower hard zone, the lateral displacement of the station might be greater than that in single strata, which is a great threat to the station during earthquakes. us, the seismic performance of the station in composite strata remains uncertain
It can be concluded that the test design was reasonable and its results were reliable to reveal the seismic response of the model structure and soil

Summary

Introduction

With the merits of improving space utilization efficiency and architectural aesthetics, a new type of subway station, a large-span and column-free subway station, is to be built in Guangzhou Metro Line 11 for better services and more comfortable travel. e large-span and column-free subway station has a platform width larger than 10 m, in which the columns of the public area are eliminated, providing more space and visual enjoyment for passengers. The seismic performance of such a large-span and column-free subway station needs more attention. E collapse of the Daikai subway station during the Great Hanshin Earthquake [1] has attached more attention to the seismic performance of underground structures. A series of centrifuge and shaking table tests have been carried to understand the aseismic ability and damage mechanism of underground subway stations. Iwatate et al [3, 4] conducted several shaking table tests on underground subway stations. It was contended that the Daikai subway station suffered great horizontal shear force from the surrounding soil, and shear failure caused the collapse of the columns after damage to the roof slab. Ohtomo et al [5, 6] performed shaking table tests on underground reinforced concrete structures and believed that the deformation of the surrounding soil controlled the deformation of the

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