Preliminary Investigation On Displacement-Based Integrated Seismic Design Of Frame Structure And Control Systems:Theory And Application

Earthquakes are one of the major natural disasters on Earth,and earthquakes that occur in human activity areas tend to cause huge casualties and property damage.In order to improve the performance of the structure under earthquakes,the energy-consuming equipment has been widely used in the energy consuming and vibration control design.Although many scholars have done a lot of work in structural energy consuming and vibration control design,the design method used previously are step-by-step and independently.Due to the coupling relation between the structural system and the energy dissipation system,the traditional method not only requires a large number of iterative processes,but also difficult to achieve the desired performance objectives.In order to simplify the design method of the energy consuming and vibration control,this research proposed an integrated design of the structure systems and the energy consuming systems.The research work of this paper mainly includes the following contents:(1)This paper introduced the performance-based seismic design method,and summarized the strategies and methods of integrated design at home and abroad.This paper introduces and compares the common passive energy-consuming devices,and summarizes the response of the structure which assembled the energy-consuming equipment.The mathematical model of the integrated design is put forward.(2)On the basis of clarifying the integrated design,the design variables of the integrated design are determined,and the integrated design flow is put forward.Compared with the traditional method,the integrated design method used in this paper is simpler and easier to use.(3)Use the seven ground motion records which matched with the norm spectrum,the displacement response spectrum is drawn and the average displacement response spectrum is drawn to evaluate the damping ratio requirement of the structure.After obtained the demand of damping ratio,the design variables of different target displacement are evaluated.The analysis shows that the lateral stiffness of the bracing system increases significantly with the increase of the ratio of lateral stiffness of the structural system and the lateral stiffness of the integrated system.(4)Taking the minimization of cost index as the goal,the optimal integration design is explored.For the given cost ratio,the optimal design variables of the integrated design can be determined according to the natural period of the structural system and the target displacement,eliminating the iterative process in the traditional design method.(5)The results show that the integrated system can achieve the expected performance target,and the validity of the integrated design method to SDOF system is verified by using MATLAB software to analyze the integration system.The validity of the integrated design method to the MDOF system is verified through two MDOF system examples.In view of the above,this paper,based on the domestic and foreign research on the integrated design of energy dissipation and vibration control structure,put forward a more simple and easy integrated design method.Through the dynamic analysis of the specific examples,the validity of the proposed integrated design method is proved.Compared with the traditional step-by-step and independent design method,the integrated design method proposed in this study avoids a large number of iterative processes and simplifies the design process which hope can better serve the engineering practice.