دوره 9، شماره 2 - ( 1-1398 )                   جلد 9 شماره 2 صفحات 193-177 | برگشت به فهرست نسخه ها

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Ganjavi B, Hajirasouliha I. OPTIMUM PERFORMANCE-BASED DESIGN OF CONCENTRICALLY BRACED STEEL FRAMES SUBJECTED TO NEAR-FAULT GROUND MOTION EXCITATIONS. International Journal of Optimization in Civil Engineering 2019; 9 (2) :177-193
URL: http://ijoce.iust.ac.ir/article-1-383-fa.html
OPTIMUM PERFORMANCE-BASED DESIGN OF CONCENTRICALLY BRACED STEEL FRAMES SUBJECTED TO NEAR-FAULT GROUND MOTION EXCITATIONS. عنوان نشریه. 1398; 9 (2) :177-193

URL: http://ijoce.iust.ac.ir/article-1-383-fa.html


چکیده:   (18338 مشاهده)
This paper presents a practical methodology for optimization of concentrically braced steel frames subjected to forward directivity near-fault ground motions, based on the concept of uniform deformation theory. This is performed by gradually shifting inefficient material from strong parts of the structure to the weak areas until a state of uniform deformation is achieved. In this regard, to overcome the complexity of the ordinary steel concentrically braced frames a simplified analytical model for seismic response prediction of concentrically braced frames is utulized. In this approach, a multistory frame is reduced to an equivalent shear-building model by performing a pushover analysis. A conventional shear-building model has been modified by introducing supplementary springs to account for flexural displacements in addition to shear displacements. It is shown that modified shear-building models provide a better estimation of the nonlinear dynamic response of real framed structures compared to nonlinear static procedures. Finally, the reliability of the proposed methodology has been verified by conducting nonlinear dynamic analysis on 5, 10 and 15 story frames subjected to 20 forward directivity pulse type near-fault ground motions.
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نوع مطالعه: پژوهشي | موضوع مقاله: Optimal design
دریافت: 1397/7/11 | پذیرش: 1397/7/11 | انتشار: 1397/7/11

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