Seismic Analysis for Nuclear Power Safety Related Bridge
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0718-6
Structural Engineering
Seismic Analysis for Nuclear Power Safety Related Bridge Yang Zhoua,b, Yi Sui
a,b
, Xin Liuc, and Tao Gongc
a
The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China Institute of Earthquake Engineering, Dalian University of Technology, Dalian 116024, China c State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, China b
ARTICLE HISTORY
ABSTRACT
Received 26 April 2020 Accepted 13 September 2020 Published Online 30 November 2020
For the first time in China’s nuclear power industry, an in-plant emergency access bridge is proposed to be constructed. This bridge inside the nuclear power plants will serve as an important emergency evacuation route and as an access port for rescue operations in the power plant under potential accident conditions. Thus, the seismic safety of the bridge is a critical matter. This paper, which is based on a real engineering project, builds a refined finite element (FE) model for a continuous girder bridge-foundation structure. A seismic wave input method based on a nonlinear artificial boundary is used to suggest a reasonable size for a truncated foundation area for the purposes of dynamic simulations. The paper further discusses the influences of the nonlinear viscous artificial boundary and other various seismic wave input methods on the dynamic response of the bridge. Results show that compared to the traditional viscous artificial boundary, a nonlinear viscous artificial boundary has a better absorbing effect. The error of the bending moments at the bottom of piers improves from around 3.2% to around 1.9%. At the same time, compared to the “bottom wave + lateral free” and “bottom wave + lateral shear” of two seismic wave input methods, the nonlinear wave input method can generate results with higher accuracy. With the nonlinear input method, the error of the bending moment at the bottom of piers improves from around 13.7% to around 1.9%.
KEYWORDS Pile-soil interaction Seismic wave input Bridge in nuclear power plant Seismic response Refined finite element model
1. Introduction Currently China and other countries are vigorously developing the nuclear power industry, and there is a rapid growth in the construction of nuclear power plants (NPPs). At the end of 2018 (International Atomic Energy Agency, 2019), 170 NPPs reactors were under construction around the world. As result of the vigorous development of the nuclear power industry, China’s nuclear power plants have begun planning to build bridges. For example, in order to facilitate the construction needs of secondphase No. 5 and No. 6 power reactors, a bridge between the firstphase and second-phase plants will be built. The bridge doubled as the daily access route during the operational period and an inplant emergency evacuation pathway for special circumstances. However,
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