Analysis And Evaluation Of The Seismic Performance Of The Hot Water Boiler Main Plant Reinforced Concrete Frame Bent Structure

Thermal power plant is lifeline engineering which should have sufficiently high seismic capacity when the earthquake occur, so that it can provide a reliable guarantee for the national economy and people’s lives and property safety. To ensure the reliability and normal use of such structure in the strong earthquake has become a very important topic that has research value in the field of seismic.Currently, the designers are nor very clear in regard to the seismic performance of the structure in the elastoplastic stage. In view of this phenomenon, this paper took a main plant reinforced concrete frame bent structure of a actual project as study example, and established structural analysis model with Midas Gen finite element analysis software. This paper carried out seismic analysis and evaluation of the structure under different seismic intensity, to determine that the seismic capacity of the structure of the original design under appropriate seismic intensity, and the surplus degree of the seismic capacity of the original structure under higher seismic intensity. The research results are shown as follows:1. It carried out elastic analysis of the structure under 7 degree small earthquake. The indicators of the structure are able to meet the seismic code requirements and the structure is in elastic stage.2. The structure was carried out pushover analysis under 7 degree rare earthquake in case of X and Y directions of horizontal earthquake that was simulated with the modal load mode and the acceleration load mode. The structural differences of the earthquake response between the two load mode are as follows:The structural displacement in the modal load mode is greater than which in the acceleration load mode when the structure reaches the same base shear; The horizontal loading force in the acceleration load mode is greater than which in the modal load mode when the structure reaches the target displacement.3. It evaluated the seismic performance of the structure under 7 degree rare earthquake with capacity spectrum method. The structure has performance points and can meet the limit of the elastic-plastic interlaminar angle of displacement of the seismic code requirements, and the structure are able to meet the requirement for fortification against earthquake of "No Collapse in the Strong Earthquake"; the distribution of plastic hinges accord with the seismic design philosophy of "strong column and weak beam" and "strong shear and weak bending". The results indicated that the structure of the original design can meet the seismic requirements under 7 degree rare earthquake.4. It analyzed and evaluated the seismic performance of the structure under 8 degree rare earthquake with the same method. The structure is still in elastic stage under small earthquake. The structure can not always get performance points in all conditions under rare earthquake, and the maximum interlaminar angle can not always meet the limit of the elastic-plastic interlaminar angle of displacement of the seismic code requirements; the structure are not able to meet the requirement for fortification against earthquake of "No Collapse in the Strong Earthquake" on the whole. The results indicated that the surplus degree of the seismic capacity of the original structure can not make the structure meet the seismic requirements under 8 degree rare earthquake.