Study-based On Frame Structure Deformation And Seismic Energy Dissipation Of The Failure Criterion

As a development trend, performance-based seismic design of engineering concludes the static nonlinear and dynamic non-linear studies. Among them, the dynamic nonlinear time history analysis is considered to be more accurately reflect the structural response of the entire process.The method of time-history analysis to caculate energy had some development, but most of the analysis were based on layer model. In order to discuss the energy distribution in individual components of the structure, such as beam and column, established the bar-model on framework of the structure for the study.In view of the most of commercial software still not caculating the time-history energy of elments, compiled the general program to solve this problem and apply for discussing the double parameters criteria.At present, the civil engineering field thought that the accumulated energy and displacement were the main reasons of destroyring the structure. Niu's model was improved basing on the Park-Ang model, and the studying object was layer-model, which not considered the beam's influence to the damage of total structure.Above all, the paper discussed the energy condition of the elments and structure, and researched on the Niu's model under the time-history analysis in different waves. The main contents and results were as following:①For a true indication of the energy distribution, a flat structure of the framework of the model(5.1&5.2)was designed that waves were selected by double-index (Tg and T1) method. A large commercial software (as SAP2000) to elements of structure was used for nonlinear analyzing;②For directly and conveniently getting the energy value of elments in every second, used of computers in the c language vc++ interface programs, and made operating interface. Solved the computational problem of input energy and hysteretic energy. And compared with a result from hand computation, ensured the application results accurate and credible;③By discussing the energy of elments and structure under different waves, the value is more in the medium&long waves than the short waves. This article thought that under the actions of medium&long waves, the contributions of hysteretic energy is more, and under the actions of short waves, the contributions of hysteretic energy is less; ④Under the actions of 6 different waves in this article, discussed the displacement criterion and double damage criterion. The final result was that displacement criterion underestimated the structural damage index, and double damage criterion was more security in seismic design. In the limit view of Niu's model which took the layer modal for discussion and not included the influence of beam elments, through preliminary calculations, ensured the value range ofλ, and compared the value ofλunder the medium&long and short waves.Through the discussing conclusion in the total paper, to provide a reference to the seismic design, and to provide a further improved application of research projects for double parameters of the destruction.