DISPLACEMENT-BASED DESIGN OF DISSIPATIVE BRACES AT A GIVEN PERFORMANCE LEVEL OF A FRAMED BUILDING
The insertion of dissipative braces proves to be very effective in order to enhance the performance of a framed building under seismic loads. For a widespread application of this technique, practical design procedures are needed. In this paper a design procedure aiming to proportion damped braces in order to attain, for a specific level of seismic intensity, a designated performance level of the structure is proposed. Exactly, a proportional stiffness criterion, which assumes the elastic lateral storey-stiffness due to the braces proportional to that of the unbraced frame, is combined with the Direct Displacement-Based Design, in which the design starts from a target deformation. To check the reliability of the design procedure, a six-storey reinforced concrete (r.c.) plane frame, representative of a medium-rise symmetric framed building, is considered as a test structure, which primarily designed in a medium-risk seismic region, has to be retrofitted as in a high-risk seismic region by insertion of braces equipped with either hysteretic dampers or viscoelastic ones. Nonlinear dynamic analyses are carried out, under real and artificially generated ground motions, by a step-by-step procedure. Frame members and hysteretic dampers are idealized by bilinear models, while the viscoelastic dampers are idealized by a six-element generalized model describing the variation of the mechanical properties depending on the frequency, at a given temperature.
Framed building damped braces performance based design displacement based design nonlinear seismic analysis
F. Mazza A. Vulcano
Dept. of Engineering Modeling, University of Calabria, Rende Cosenza, Italy
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）