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Based on the principle of web weakening, two types of variable-cross-section shear links for horizontal eccentrically braced steel frames (H-EBFs) were analyzed in this study. In the first design, an I-section link (L2) was designed with a lower web and wider flange than that of an ordinary shear link (L1), and in the second design, an I-section link composed of two small I-section beams (L3) was designed. To study the seismic behavior of the two types of H-EBFs, cyclic loading tests were performed on three scaled specimens, L2 (H-EBF-L2), L3 (H-EBF-L3), and a traditional link (H-EBF-L1). The results showed that most of the inelastic actions of the three specimens were concentrated in the shear links and that the failure modes were similar. Compared with specimen H-EBF-L1, the links of specimens H-EBF-L2 and H-EBF-L3 had better deformability, and the bearing capacity of the frames also improved simultaneously; thus, the energy-dissipation mechanism of H-EBF improved. The material costs of specimens H-EBF-L2 and H-EBF-L3 were reduced to a certain extent, realizing economic benefits. Additionally, the numerical models of the three specimens were established. The modeling results were in good agreement with the test results, and it was verified that the model could accurately simulate the loading process of the tests. [ABSTRACT FROM AUTHOR]

This paper proposes a kind of assembly brace connections adapted to the core tube flanged column connection joint of the frame-brace structure, starting from the eccentrically braced frame structure in the steel frame system and designing and completing a set of proposed static tests of the eccentrically braced frame with the core tube flanged column connection joint. By conducting in-depth analysis and research at three levels, namely the seismic performance of the eccentrically braced frame system, the performance characteristics of the core tube type flanged column connection joints, and the performance of assembled brace connections, the study has yielded insights into the force mechanism and failure modes of the core tube type flanged column connection joints within the eccentrically braced frame system; the eccentrically braced frame system has been validated to possess good seismic performance by analyzing hysteresis curves, typical section strains, and bolt forces. These analyses have shown that the system can meet the seismic requirements. Moreover, the assembled brace joints were destroyed later than the braces, indicating that the assembled brace connection joints could fulfill the requirement of "strong joints." • This paper proposes vertical member connection joints that can achieve efficient assembly. • The eccentric braced frame proposed in this paper is capable of realizing fully bolted rigid connection. • The performance of the core tube flange connection joint in the steel frame-eccentric brace system are further investigated. • This paper proposes an assembled brace joint connection form that is applicable to the core tube flange connection joint. [ABSTRACT FROM AUTHOR]

Bu çalışmada, Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik-2007 (DBYBHY-2007) ye göre boyutlandırılan altı katlı dış merkez çaprazlı bir çelik perdenin deprem performansı, zaman tanım alanında doğrusal olmayan hesap yöntemi kullanılarak değerlendirilmiştir. Bu değerlendirmede göreli kat ötelemeleri, kat kesme kuvvetleri, çapraz ve kolonların iç kuvvet istemleri ile bağ kirişi kesme kuvveti ve dönme istemleri dikkate alınmıştır. Zaman tanım alanında doğrusal olmayan analizler yedi adet deprem ivme kaydı kullanılarak gerçekleştirilmiştir. Analizler sonucu elde edilen istemlerin ortalama değerleri esas alınarak dış merkez çaprazlı çelik perdelerin kullanıldığı orta yükseklikteki binalar için DBYBHY-2007'de öngörülen kapasite tasarımı yaklaşımının yeterliliği araştırılmıştır.

Bu çalışmada, Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik-2007 (DBYBHY-2007) ye göre boyutlandırılan altı katlı dış merkez çaprazlı bir çelik perdenin deprem performansı, zaman tanım alanında doğrusal olmayan hesap yöntemi kullanılarak değerlendirilmiştir. Bu değerlendirmede göreli kat ötelemeleri, kat kesme kuvvetleri, çapraz ve kolonların iç kuvvet istemleri ile bağ kirişi kesme kuvveti ve dönme istemleri dikkate alınmıştır. Zaman tanım alanında doğrusal olmayan analizler yedi adet deprem ivme kaydı kullanılarak gerçekleştirilmiştir. Analizler sonucu elde edilen istemlerin ortalama değerleri esas alınarak dış merkez çaprazlı çelik perdelerin kullanıldığı orta yükseklikteki binalar için DBYBHY-2007'de öngörülen kapasite tasarımı yaklaşımının yeterliliği araştırılmıştır.

The goal of this paper is to investigate the non-linear response and to assess the seismic performance of a six story eccentrically braced steel frame (EBF). For this, split-K-braced EBF with high ductility level designed according to the Turkish Earthquake Code-2007 (TEC-07) is analyzed under seven selected earthquake records. The performance of the EBF is assessed considering drift, story and base shear demands, brace and column axial forces and bending moment demands, link beam shear force and rotation demands. Mean values of the demands are used in the performance assessment. The provisions based on capacity design approach specified in TEC-07 for EBFs with high ductility level are discussed by employing the findings. [ABSTRACT FROM AUTHOR]