A Performance-based Seismic Design For A Certain High-rise Building In Chengdu

The performance-based seismic design that has emerged since the 1990 s has become the development direction for modern structural seismic design.However,the over-limit structure is very unfavorable to the seismic performance of the structure.In order to strengthen the safety and reliability of the structural earthquake resistance,it is very important to select a reasonable seismic performance target and an appropriate structural earthquake-resistance method in the structural design.Therefore,the main purpose of the performance-based seismic design is to make the structural damage loss under the action of the earthquake,so that the owners can be satisfied and accept,and make the structure after the earthquake function can continue and continue to use.In this paper,a 42-story high-rise building in Chengdu with a structural height of 167.90 meters according to China’s current national standards,the height of the building’s shear wall structure exceeds the maximum height of 120 meters;according to the calculation results,it is found that there are still twists and turns(1.2 <1.39(1.39)<1.1),abrupt change in stiffness(ratio of 4F to 5F lateral stiffness <1.1,4F layer height greater than 1.5 times the height of 5F layer)two overruns.The research object selected in this article was the structural system of the building.The performance-based seismic design was used to design the structural system.According to the ground survey report,the foundation information,site structure,and other important information were combined to combine the functions of the main structure and met the economy..Under the conditions of sexual requirements,the main calculation software and anti-seismic enhancement measures that were required to meet the performance and requirements of seismic design were as follows:Two different mechanical model spatial analysis programs SATWE,Midas Gen were used to perform the entire row calculation and analysis,check The calculation results were check with each other to ensure that the overall calculation structure was consistent and ensure that the analysis and judgment of the local components were consistent.The elastic time history analysis of small earthquakes was performed using SATWE software.The calculation results of the base shear of the three waves(two natural waves and one artificial wave)were consistent with the calculated results of the standard response spectra.And the envelope value of the time wave of 36 F and above was slightly larger than the specification response spectrum value to ensure the safety of the components.The seismic performance of the key components under the fortification intensity was checked,and the verification results met the predetermined seismic performance targets.Midas Gen software was used to analyze the stress of the small and medium earthquakes on the plinth roof surface and the 31-story floor slab.It was made to meet the predetermined seismic performance goals.The 3D software was used to analyze the elasto-plastic time history of the main body of the building structure.The analysis results showed that the relative displacement angle of the vibration between each floor of the building was less than the permissible value,the main structure was able to meet the preset target performance requirements,and the structure was safe.Degree was more abundant.And for the weak parts of the results,a stricter fitting structure than the specification was adopted.Based on the above conclusions,it can be seen that the structure can meet the seismic performance target of large earthquakes at a fortification intensity of 7 degrees.