Study On Improving Practical Design Method Of Energy Dissipation And Damping Structure

With the continuous development of structure control technology and theory of performance-based seismic design theory, many energy dissipation theories and methods of structure design have been developed at home and abroad. FEMA356, JSSI manual, "Code for seismic design of buildings" (GB 50011,2010) and "building energy dissipation and vibration reduction technical regulations" (JGJ 297-2013) in China have ruled the relevant provisions of the analysis model, analysis method, performance target, and the technical performance of the damper. In addition, there are design methods directly based on displacement, design methods based on capacity spectrum, design methods based on performance and requirements, etc.. But these existing design methods have certain deficiencies and certain limitations.In this paper, the existing energy dissipation structure design methods are improved, and the practical design method of energy dissipation structure of additional displacement dependent damper is obtained.First of all, the energy dissipation design method for the application of low yield point steel damper is discussed, which should also consider low yield point steel damper under small earthquakes effects of additional stiffness and additional damping.Then, the existing energy analysis method and design method of damping structure are discussed, that is necessary for the following improvement:(1) in order to improve the precision of the calculation, estimating the equivalent periodic, equivalent stiffness and damper of additional equivalent damping ratio of energy dissipation structure should consider the effects of the second stiffness coefficient of damper. In the process of distributing combination unit initial stiffness and damper initial stiffness and brace stiffness by single degree of freedom system to multi degree of freedom system, considering the effects of both the damper the second stiffness coefficient and the ratio of initial stiffness of brace and damper; (2)In order to reduce the workload and improve the design efficiency, the earthquake time history which analysis of the first mode vector closest to the seismic spectrum case should be chosen to draw the performance curve and determine the performance point of the demand.Finally, the practical design method of energy dissipation and damping structure of additional displacement dependent damper is summarized, and the practical design method is proved be practical and correct.