Research On Design Method Of Friction Energy Dissipation Braced Frame Structure Based On Elastic Stiffness

The earthquake is one of the most hazardous natural disasters which is threatening human beings. With the development of the economy and society, the technology of earthquake resistance, as a measure of lightening earthquake disaster, has become a main branch of disaster prevention and mitigation of engineering. Aiming to be with "Low-cost, High-performance, Easy-manufacturing and Convenient-construction", YNEERI studied an energy dissipation frame system consisting of RC brace and steel-rubber friction dissipater. In combination with the status of engineering application in high earthquake intensity zone, this article studied the design method of friction energy dissipation braced frame system.This paper briefly introduced the classification of the technology of structure control and the development of the passive control technique, summarized the researches and practices of RC brace-friction energy dissipation frame system and reviewed the theory and model for seismic response analyses, the usual analysis methods of dynamic characteristic and the existing design method of friction energy dissipation braced structure. In accordance with the actual buildings seismic codes and application experiences of the friction energy dissipation frame system, it indicated the idiographic contents of every design phase and put forward the processes of the friction energy dissipation braced frame system.This paper deduced the relation between seismic load and elastic lateral stiffness of the equivalent SDOF system by the study of transforming the multi-degree-of-freedom (MDOF) system into an equivalent single-degree-of-freedom (SDOF) system through displacement mode. From the story drift limit and the distribution of stiffness and mass of major frame structure, the seismic load and elastic lateral stiffness of the structure system can be computed, In combination with bottom shears method, by using the fundamental mode or linear displacement mode of the major frame, in which enables the MDOF system to be transformed into the equivalent SDOF, it deduced the design method basing on the elastic stiffness and derived the procedures of design method of friction energy dissipation braces. Combined with mode-superposition response spectrum method, by using the lateral displacement vector, in which enables the MDOF system to be transformed into the equivalent SDOF, it deduced the design method basing on the elastic stiffness and derived the procedures of design method for friction energy dissipation braces. Through a 6-story frame structure and a 10-story frame structure, it showed the design methods and fundamental procedures. By the discussion of non-uniform distribution of lateral stiffness, it verified the reliability of the design methods. It also proposed the methods of improving precision and relatively treating skills.At last, according to the problems in the process of research and engineering application, this article brings forward the further development orientation of this field and its difficulties and problems which need to be solved.