Comparison of seismic behavior of the eccentric and conventional diagrid systems

Abstract

SummaryDiagrid system is known for its efficient structural behavior besides its outstanding aesthetic characteristics and architectural flexibility. However, a brief existing study on the nonlinear performance of the diagrid system has reported an inefficient nonlinear behavior. Diagrid with fused‐shear link is a newly introduced system that can solve this flaw in the conventional diagrids and keep the advantages as well. In this paper, this newly introduced system is called eccentric diagrid system (EDS). Benefits of the EDS are presented, and a series of nonlinear pushover and time history analyses are conducted to compare EDS with the conventional diagrid system (CDS). In this manner, three different configurations for both EDS and CDS with diagrid angles of 45°, 63.4°, and 71.6° are chosen for two different 12‐ and 18‐story buildings. The models are designed based on an R‐factor equal to 3.6 and 5 for CDS and EDS frames, respectively. Then, the assumed R‐factor for EDS is verified according to Federal Emergency Management Agency P695, and the priority of members yielding is spotted. The results show that EDS can effectively enhance the post‐yield performance and seismic characteristics of the structure relative to CDS, including ductility and overstrength ratio more than 2.5 and 1.3 times, respectively.

Reconfigurable molds and a fabrication-aware design tool for manufacturing concrete grid structures

“…Moreover, its eccentric diagrid is one of the latest concrete space structures with improved seismic behavior compared to concentric bracing systems. 29 Flexi-node has the potential to make this type of architecture more adaptive and cost-effective, providing designers with new opportunities to implement their creative visions; however, further research is required in terms of implementing continued curved rebars before the casting process.…”

Performance‐based plastic design and seismic performance evaluation of twisted diagrids with shear links

“…Each diagonal member is divided into two equal NonlinearBeamColumn elements, and an initial imperfection of 0.5% of the diagonal length is applied at the midpoint, [ 20 ] as shown in Figure 11a. The shear link member is simulated using two DispBeamColumn elements and a ZeroLength element, [ 28 ] as shown in Figure 11b. Based on the method proposed by Koboevic et al, [ 46 ] the shear behavior of the link members is applied to the zero‐length element.…”

“…In a following paper, Li et al [ 27 ] extended the performance‐based plastic design method to the seismic design of fused diagrid structures. More recently, Dabbaghchian et al [ 28 ] compared the seismic performance of diagrid systems with and without link beam members. The results showed that link members can significantly increase the safety margin of diagrids.…”

آنالیز تاب‌آوری لرزه‌یی سازه‌های شبکه ی قطری بلندمرتبه با پیکربندی پیرامونی مختلف بر اساس معیار شاخص نیرومندی

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