This paper reviews and analyzes history and the present situation of turbine generator foundation in China for the last ten years. It states dynamic analysis, static deflection analysis and model test technology. By analyzing project examples, this paper introduces the development and application of this technology. In order to advance China's technology of turbine-generator foundation designing, this paper provides reference for designing foundations of turbine generators.

Taking the background of a 1∶10 model of spring vibration isolated turbogenerator foundation used in the actual project,its dynamic characteristics is tested.This paper summarizes the new technology and its test results about this model test.The test result proves that the vertical natural frequency of the spring vibration isolated foundation leads to an obvious decrease;the type of overall vibration plays the leading role in the spring foundation;and the interference power point of the RMS of maximum vibration velocity within the scope of work speed is much less than limits ruled by A-at ISO standard,that is 2.8 mm/s.Isolation efficiency of foundation are X-direction to 97.99%,Y-direction to 97.80%,Z-direction to 94.76% on average,which indicates that the spring foundation is best selection for half speed machine whose operating frequency is 25 Hz.Meanwhile,through the comparison between the test result and calculation resutf,it is proved that the reduced scale model test of spring vibration isolated turbogenerator foundation is possible;through comparative analysis of different models,it thinks that the entire model is closer to the test result.

The foundation of reciprocating boiler vibrating sieve in a garbage-fired power plant belongs to dynamical equipment foundation.When the machine runs to one frequency,the vibration of concrete column is so big that the machine cannot increase the frequency again and stop working.ECEPDI and Environment Control Technology Co.,Ltd.conducted a deep research on the vibration of the foundation through theoretical analysis to explore the root of foundation-vibration and proposed two plans to solve the problem with scientific schemes:1) Reinforcing the original structure to make its frequency avoid the machine running frequency.2) Adding two tune mass dampers(TMD)on the top of the concrete column to dissipate kinetic energy and reduce the displacement.By comparing these two schemes,we deem that the scheme 2 is the better one.We want to share this information for the reference of similar projects.

三门核电站主厂房为大跨度钢框架结构,采用有限元分析程序ANSYS对主厂房整体结构进行模态分析和弹塑性时程分析。通过其固有振动周期和振型,对结构的振动特性有简单的认识。根据分析结果对三门核电站主厂房的抗震性能进行评估,认为结构在相同场地条件下具有良好的抗震性能。

Based on the partial factors format of design,the reliability index of the design code is calculated with the method of calibration,and based on which the target reliability index is determined.Furthermore,the statistical parameters of some variable loads in 60-year design reference period are calculated,by the principle of equal exceeding probability.Finally,it is assumed that the dead load factor and resistance factor are invariable,only the live load factor and coefficient for combination value are revised to satisfy the target reliability index.The new partial factors format of design in 60-year design reference period is in conformity with the design code,and it is also convenient for the engineering application.

The seismic design requirement of conventional island main buildings is increasingly enhanced because of the significance of nuclear safety.The pushover analysis method was used in this paper to calculate structural elasto-plastic deformation under ultimate safety earthquake in the seismic design of conventional island main buildings.The analytical results show that the structural members do not reach their limit bearing capacities,the main structure can remain stable and the total collapse does not occur.The analytical results also verify the elasto-plastic deformation of the structure does not affect nuclear island affiliated buildings.The structural seismic performance evaluated by deformation indicates that it is safe and reliable to meet the nuclear safety design principles.

In this paper,the equal exceeding probabilityprinciple is carried out to determine the characteristic value、statistica parameters of variable load.The equal exceeding probability principle is based on the equal exceeding probability between 50-year design reference and 60-year design reference.The corresponding results of floor live load,wind load and snow load are given.This study can also be applied to the structure of differen design reference period.

In this paper,seismic risk analysis of Sanmen nuclear power station is carried out for determining its anti-seismic performance and seismic design parameters.Through the data about the region and near region seismic activity,geological tectonics as well as the earth geophysical fields has been gained.According to the need of 60-year design code for anti-seismic of engineering structures,the bedrock peak acceleration rate of exceeding probability of 63%,10%,2%,0.2% and 0.01% are given respectively and seismic motion parameters are also calculated,which will provide the evidences for anti-seismic design of this nuclear power station.The result shows that the peak acceleration of this site is small in 60-year design reference period and the geological tectonics of Sanmen are suitable for nuclear power station.

1 概述 某发电厂285MW的燃气机组为燃气/蒸汽联含循环机,其主要设备分别为:燃气轮机(额定工作转速:5051rpm)、发电机(额定工作转速:3000rpm)、压缩机(额定工作转速:6461rpm)等.该机组的基础形式属于大块式基础,其大底板厚2.9m,基础长30多m,底面积近260m2.基础尺寸详见图1,2.由于采用天然地基,地基的刚度将直接影响到基础的动力特性,因此计算基础动力特性的同时必须考虑地基对基础的影响.

Considering actual design conditions of turbine-generator foundation of Huainan Pingwei No.2 Power Plant,optimized foundation design that combines advantages of European and US designs is proposed.It is analyzed theoretically and validated by tests.The designed foundation not only passed 1∶10 model vibration test,but also passed 168 h fully loaded operation test.