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DISPLACEMENT-BASED SEISMIC PERFORMANCE EVALUATION OF DHAJJI STRUCTURAL SYSTEMS Naveed Ahmad1, Qaisar Ali2, Helen Crowley3 and Rui Pinho4 Abstract The paper presents the derivation of mechanical models, using experimental and numerical investigations, for the development of displacement-based seismic performance evaluation of Dhajji wall, timber-braced frame with masonry infill, structural systems. The mechanical model uses secant vibration period, limit state displacement capacity, viscous damping and overdamped displacement spectrum to assess the global seismic performance of structures. Three full scale Dhajji walls typical of current construction practice in Pakistan are tested quasi-static-cyclically to obtain drift limits, hysteretic response, viscous damping and strength envelope of Dhajji walls which are analyzed to develop a simplified method for the nonlinear dynamic time history analysis of Dhajji structures using equivalent frame approach. Thirty-six case study 2D structural models, representing regional building stock, are analyzed using natural accelerograms in order to develop limit state vibration period and displacement capacity formulae. Controlled Monte Carlo simulation is used to generate random populations of regional building stock, taking into account the uncertainties in the geometrical and mechanical properties of the systems, to develop analytical fragility functions for Dhajji buildings, which, along with the fragility functions for other building typologies, can be used for seismic risk map development, regional code development, modeling insurance schemes, earthquake preparedness and planning and decision making in the region. Case study application is performed to derive damage probability matrices for scenario earthquakes in the region in order to estimate the number of Dhajji buildings required to be retrofitted. Keywords: Displacement-Based; Nonlinear Static; Seismic Risk Assessment; Dhajji; Pakistan. به نقل از کانال تلگرام جداسازی لرزه ای و میراگرهای انرژی دانلود از پیوست DISPLACEMENT_BASED_SEISMIC_PERFORMANCE.pdf

Examine the Effect Height on Changing Intermediate Flexural Frames Performance Level after Adding Outward-Oriented Vestibule Braces Original Article, D73 Khaksefidi S., Ghalehnovi M., Rahdar H. A., Rezaee M.. J. Civil Eng. Urban. 4(4): 485-491. 2014 ABSTRACT: Considering the inability to design techniques based on force the predicted nonlinear behavior of members, arising from the non-linear properties of materials and the importance of design resistant structure against dynamic loads, such as earthquake force, in-in recent years the tendency of engineers and designers are increasing the use of design methods, based on the displacement and behaviour (design based on performance). Speed and a lot of materials and task force, has led to the construction of steel structures in the countries to expand. Moreover, the presence Iran on the seismic belt ALpayd, more need to study the behaviour of these structures and them resistant design becomes more apparent. On the other hand, construction special flexural frames, recommended by most regulations for use in high seismic zones, it may not, by Non-specialist workforce; Thus, flexural frame, mostly, are constructed from median flexural that using it alone is not suitable in high seismic zones. Therefore, for ease of implementation, often, the first proposals for strengthening these frames is to add brace to them. Also, the urban development and housing demand, shortage of suitable land for urban development alters the pattern of buildings to the high-rise building construction. In this study, with regarding architectural considerations, the effect height at changing flexural steel frames performance level after adding outward-oriented vestibule braces under nonlinear static loading is examined. Capacity spectrum method (CSM) in ATC-40 to obtain performance level was used. SAP2000 software was used for modeling and analysis. Keywords: Flexural Frame, Nonlinear Behavior , Nonlinear Static, Outward-Oriented Brace منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(4)%20485-491,%202014.pdf J. Civil Eng. Urban., 4 (4) 485-491, 2014.pdf