山东海阳核电一期取水沟道进出口部位抗震分析

以山东海阳核电一期取水沟道工程为背景,采用动力时程反应分析方法,利用非线性有限差分软件FLAC3D建立三维土体-结构模型,分析该核电站取水沟道进、出口部位在自重、外水压力、土压力、温度、水锤压力、地震等荷载效应组合下的内力变化情况。通过编制FLAC3D程序并结合五点公式计算衬砌结构的内力,对该核电取水沟道进、出水口部位进行抗震分析。计算结果表明温度荷载、水锤压力以及地震荷载对沟道进出口部位内力影响显著,设计施工时应对薄弱截面进行加密配筋处理。本文的计算方法和分析成果可为核电厂取水沟道地震反应分析以及其他类似结构设计提供参考。

Seismic Analysis of Water Intake Channel Inlet/Outlet for Haiyang Nuclear Power Project in Shandong

This paper is based on the first stage of a water channel project of the Haiyang nuclear power project in Shandong Province. Using a dynamic time history response analysis method, we establish a three-dimensional soil structure model using the nonlinear finite difference software FLAC3D. We analyze the internal force changes of the nuclear power station''s water channel under the combined effect of weight, water pressure, soil pressure, temperature, water hammer pressure, and seismic load. We carried out the seismic analysis of the inlet and outlet of the nuclear power station by FLACE3D programming, and calculated the internal force of the lining structure using a five-point formula. First, we addressed the internal force changes of the inlet-outlet channel position under the combined effect of weight, water pressure, soil pressure, temperature, water hammer pressure, and seismic load. Secondly, we selected three typical conditions and performed a comparative analysis of the internal force of the inlet-outlet position with different wall thicknesses. The calculation results show that: (1) Temperature has a significant effect on the internal channel outlet position if the internal temperature is greater than the external temperature. (2) Water hammer pressure force has a significant effect on the outlet of the channel, which can be used as a control condition for static analysis. (3) Seismic load also has a significant effect on the outlet of the channel, which can be used as a control condition for seismic analysis. (4) Different wall thicknesses also have a significant effect on the outlet of the channel; the thicker the wall thickness, the greater is the internal force. Therefore, based on the above conclusions, weak cross sections should be reinforced when being designed and constructed. The calculation method and analysis results in this paper can provide a reference for seismic response analysis of water channels in the nuclear power plants and in other similar structures.