Analysis and modelling of the seismic behaviour of high ... - Ingegneria

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2. DUCTILITY AND SEISMIC RESPONSE OF STRUCTURES SEAOC Vision 2000 Committee (1995: Performance-based seismic engineering. Report prepared by Structural Engineers Association of California, Sacramento, CA. Vamvatsikos D. and Cornell C.A. (2001): Incremental dynamic analysis. Earthquake Engineering And Structural Dynamics, Vol. 31, 491–514. Velestos A. and Newmark N.M. (1960): Effect of inelastic behaviour on response of simple system to earthquake motions. Proc. 2th World Conference on Earthquake Engineering, Tokio, Japan, 855-912. 39
3.1 Introduction 40 3 SEISMIC BEHAVIOUR OF BOLTED END PLATE BEAM-TO-COLUMN STEEL JOINTS In high seismic risk areas such as California and Japan, steel-framed buildings have frequently been employed because of their excellent performances in terms of strength and ductility. Nevertheless, a large number of entirely unexpected severe brittle cracks of welded beam-to-column connections were found in the recent Northridge (1994) and Kobe (1995) earthquakes (Bertero et al., 1994, Kuwamura, 1998). The failures raised many questions regarding the validity of design and construction procedures used for these connections at the time. Since the earthquake, several extensive analytical and experimental studies have been conducted to investigate the various aspects believed to be associated with the failure observed in the pre-Northridge connection and to improve connection performance. The majority of the thorough investigations established that premature cracking in welded steel connections resulted from a combination of factors, such as high strain demands coupled with large inherent flaws and stress risers, overreliance on low-toughness materials, deficient field welding and insufficient quality control. As a result of poor performance of flange-welded moment connections, end plate moment connections may represent, especially in Europe, an alternative to welding in seismic regions. But because of limited cyclic testing of moment end plate connections, extensive research has been initiated. In the framework of a research programme conducted by the Department of Mechanical and Structural Engineering of the University of Trento and sponsored by a MIUR-PRIN project devoted to the analysis of semi-rigid beam-to-column connections, the presented study has a two-fold purpose:
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3. SEISMIC BEHAVIOUR OF BOLTED END
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4. SEISMIC RESPONSE OF PARTIAL-STRE
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5. SEISMIC BEHAVIOUR OF RC COLUMNS
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6. SUMMARY, CONCLUSIONS AND FUTURE
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