Research On Seismic Performance Of The Reinforced Concrete Frame-embedded Walls Structure

Converter station site is a key link of power transmission project.Valve hall and main control building is one of the most important buildings in the converter station,and it is also the structure with the highest quality and safety requirements in the converter station.The speed of its construction affects the schedule of the whole converter station directly.However,most of the valve hall structures of converter stations in China are still constructed by the traditional cast-in-place construction technology,which is obviously not in line with the trend of vigorously promoting the assembly structure and promoting the transformation and upgrading of the construction industry,so it is imperative to explore the new assembly valve hall structure.Reinforced concrete frame-embedded walls system is a new type of fabricated industrial building structure.The slot is reserved on the side of the frame column,and the prefabricated concrete wall board is inserted into the slot and connected with the frame,which can greatly save time and cost,and improve the construction quality.It is one of the preferred structural systems for the valve hall of the converter station.In this paper,the seismic simulation shaking table test and nonlinear finite element analysis of the reinforced concrete frame-embedded wall structure are carried out to explore the seismic performance of the structure under different seismic intensity.The specific research contents and results are as follows:1.Based on the characteristics of prototype structure and laboratory conditions,a1 / 3 scale non full weight test model of reinforced concrete frame-embedded wall structure is designed and made according to the similarity theory.2.Three seismic waves were selected,which are suitable for different site classification step by step loading,and recorded the acceleration time history and displacement time history of the test model under the three seismic waves.white noise sweep is carry out before and after each level of seismic wave loading.according to the modal analysis results,the dynamic characteristics of the structure were studied and the strain response and crack development is observed as the key parts of the research.3.The final test results show that the shaking table test model simulates the seismic response of the prototype structure well,and the reinforcement effect of the wall panel on the frame stiffness cannot be ignored;the structure basically meets the seismic fortification requirements,and its maximum inter story displacement angle meets the limit value of the inter story displacement angle specified in the seismic code of China;the weak part of the structure is in the first floor,and the first crack appears at the first floor beam in the test.At the end of the test,varying degrees of the damage appears in frame beam,frame column and the connection of wall-column on the first floor,which should be properly strengthened in design.4.A refined finite element model of reinforced concrete frame-embedded wall structure is established using ABAQUS to calculate the response of the structure under different seismic actions and compare with the test results.The results show that the finite element results are in good agreement with the test results,which proves the correctness of the shaking table test model designed according to the similar theory;compared with the calculating in elastic stage,ABAQUS finite element analysis software is more suitable for the elastic-plastic time history analysis of this kind of structure;reducing the number of embedded walls properly can improve the stiffness of the structure,and in designing,the appropriate number of walls shall be selected according to the site category.