Seismic Performance Analysis Of Thermal Power Plant

In recent years, increasing generation capacity of the thermal power plant have become increasingly demanding. Currently height and span are generally larger the thermal power plant, commonly used in the form of the structure is bent frame structure consists of a combination of frame and part of the bent portion composed of the former Soviet Union such a structure still in use. Due to the special requirements of workmanship, POWER PLANT Although the use of two forms of structure, but can not set seismic joints. Frame bent composite structure main features are:centroid and just heart deviation greater stiffness usually bent structure is smaller than the frame structure; overall uneven spatial arrangement, different from each feature a large load differences, there are split-level, vertical stiffness distribution uneven, when subjected to earthquake, seismic performance is relatively poor.According to "classification of seismic construction standards" GB50223-2008, general and medium-sized thermal power plant belonging to the main focus of fortification class (B), for the use of the function can not be interrupted when an earthquake or need to recover as quickly as possible lifeline engineering, should be higher than the Regional seismic intensity requirements once the seismic strengthening measures calculated in accordance with the region’s seismic intensity. Frame bent composite structure does not meet the set seismic joints in GB50011-2010is not the same height to determine the slit width "Seismic Design of Buildings" shock seam on both sides of the structure type should shock needed wider seam structure types and lower houses requirements; span structure is large, a large cross-section beams, stiffness, it is difficult to meet the "strong column weak beam" seismic requirements. In order to make the structure to meet the "strong column weak beam" seismic requirements, the need to take measures to strengthen the structure. However, the lack of reliable theoretical basis for strengthening and enhancing the degree of the site, so the need for such a structure finite element analysis, in order to ensure the effectiveness of measures to strengthen.Taking a thermal power plant frame bent composite structure, for example, based on the seismic performance design, structure push-over analysis. First, using the finite element software midas gen structural design, finite element model, the use of the method Push over analysis, seismic response of the structure (inter-story drift, story shear, deformed shape, etc.), with the ability to assess spectrum method, find a performance point, determine the weak parts or weak layer structure. Fortification area where the actual project area is7degrees, according to the standards and norms of7degrees fortification should be designed to strengthen the measures taken by the8degree earthquake intensity. Push over analysis, this paper analyzes the elastic case of an earthquake of7degrees more than the next, according to the ability to determine whether the structure of the spectrum curve in the elastic state, rare case of plastic analysis under seismic capacity spectrum curve obtained, according to the structure meets the performance point discrimination" earthquake does not fall,"the seismic fortification targets and angular displacement and deformation based on the weak parts of the structure to determine the shape of the interlayer; structure in order to test the adaptability of high earthquake zone, also carried out more than8degrees in case of earthquake and rare case of elastic analysis plastic analysis under earthquake, and were assessed by the capacity spectrum method. Examples of this analysis works, representative and universal, the results can provide a theoretical basis for the future design of such projects.