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دانلود رایکان مقاله انگلیسی ISI با موضوع پاسخ های لرزه ‌ای قاب های بتن مسلح با بادبندهای کمانش ناپذیر زیگزاگی

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پاسخ های لرزه ‌ای قاب های بتن مسلح با بادبندهای کمانش ناپذیر زیگزاگی

عنوان انگلیسی مقاله:

Seismic responses of reinforced concrete frames with buckling restrained braces in zigzag configuration

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5. Influence of higher mode vibration

While displacements are not likely to be influenced significantly by higher modes, higher modes may significantly influence internal forces. As is shown in Fig. 13(a), the difference in both interstory drift and energy dissipation between B-ST and B-LS cases is negligible, in spite of the fact that the bolt connections in B-LS case sustain much larger deformation than that in B-ST case. This suggests that the horizontal force developed in bolt connections may be a result of higher mode vibrations un-synchronized with building’s the peak inter-story drift. This is evident in Fig. 14, which compares the time history during 2–5 s of the inter-story drift at the 6th floor and that of the forces in the BRB connection at the same floor. The peak story drifts, as indicated by hollow circles in the figure, take place when the vertical force is at its maximum and the horizontal force is very small. In other words, there is a phase difference between the peak story drift and peak horizontal force.