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تحلیل احتمالاتی پایداری قاب‌های فولادی ساده و دروازه‌ای با پیوندها و تکیه‌گاه‌های نرم مجله علمی، پژوهشی: نشریه علمی و پژوهشی سازه و فولاد-شماره‌ي شانزدهم -پائیز و زمستان 1393 نویسنده: محمد رضایی‌پژند ، فرزاد شهابیان ، محسن بمبائی‌چی دانلود art-2275310719.pdf

Stability of buckling-restrained steel plate shear walls with inclined-slots: Theoretical analysis and design recommendations Shuangshuang Jin a, Jinping Oua,b,⁎, J.Y. Richard Liewc,d a School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China b Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, China c Department of Civil & Environmental Engineering, National University of Singapore, Singapore d College of Civil Engineering, Nanjing Tech University, China a b s t r a c t Article history: Received 19 April 2015 Received in revised form 27 September 2015 Accepted 2 October 2015 Available online xxxx Keywords: Energy dissipation device Steel plate shear wall (SPSW) Buckling-restrained Stability Numerical analysis Design This paper presents a novel buckling-restrained steel plate shear wall with inclined slots called slotted SPSW to be used as an energy dissipation device for earthquake resistance. In the slotted SPSW, a steel plate with inclined slotted holes is sandwiched in between two external concrete panels which provide lateral restraint to achieve stable energy dissipation under cyclic reversal loading. Theoretical analysis and finite element monotonic pushover analyses are conducted to investigate the stability of slotted SPSWs. Global buckling and local buckling resistances of slotted SPSWs are determined. Some key parameters, such as the gap between steel plate and concrete panels, bolt spacing, width of steel strips, and steel panel slenderness, are investigated through numerical analyses. The shear force and lateral drift behavior of the slotted SPSW is found to be affected by the physical gap between the concrete panels and inner steel plate. The minimumconcrete panel thickness for providing the effective lateral restraint to prevent buckling failure of the inner steel plate is determined based on the bolt spacing. 10.1016_J.JCSR.2015.10.002-Stability-of-buckling-restrained-steel-plate-shear-walls-with-inclined-slots-Theoretical-analysis-and-design-recommendations.pdf

Evaluation of Effective Parameters on the Underground Tunnel Stability Using BEM M Panji 1 ; J Asgari Marnani2 ; Sh Tavousi Tafreshi2 There are various parameters that affect stability and expansion of failure zones in under pressure tunnels. Among the important parameters that affect failure zones around the tunnels are cohesion and internal friction angle of the rock mass. In addition, the cross sectional shape is the considerable point in failure distribution around the tunnels. The stress analysis method is one of the applicable methods for evaluating stability and recognizing failure zones in underground tunnels. On the other hand, numerical stress analysis method, because of obtaining results with simplicity and desirable accuracy, is one of the best methods in stability evaluation of the tunnels. The Boundary Element Method (BEM) has unique advantages in stability analysis of infinite continuums. In this paper, using Hoek-Brown failure criteria and also BEM, failure zones around the tunnels with various section shapes are studied numerically and the effects of cohesion and internal friction angle of rock mass on formation and distribution of failure radii are evaluated. It deserves mentioning that the behavior of the rock mass around the tunnels is assumed to be elastic and the formulations are based on plane strain. منبع دانلود JSEG141329597000.pdf

The Influence of Material Properties and the Geometrical Parameters of the Operating Arch on the Stability of Vaults Original Article, D31 Valibeig N, Esmaeili M, Ansar A Journal. Civil Eng. Urban. 4(2): 199-205. 2014 ABSTRACT: One of the key elements in architecture is vault. Because timbers are locally available only in certain parts of Iran, the vaults used to be built in various arched forms especially in traditional buildings. Identifying the structural characteristics of such vaults may reveal the innovative approaches adopted by the Persian architects who tried to design and build the vaults in based on a sustainable architecture; a kind of architecture that was, from one hand, adaptable to climate, location and local materials, and capable, from the other hand, to meet the users' needs. The materials used in and the geometric characteristics of the arches are two determining factors in vault stability. The major part of the past research has focused on examining the strength of the arches statically. The present study, however, aimed to analyze the impact of materials and geometric characteristics on the vault resistance. To this end, the behavior of geometric arches in different forms and sizes along with various materials were studied. The identified generate arches were drawn by design soft wares and then analyzed by resistance analyzers. The results clearly revealed the effective role of geometric parameters, materials and thickness of arch base in vault stability. Keywords: Sustainable architecture; Stability; Generate arch; Geometry; Material . منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(2)%20199-205,%202014.pdf J. Civil Eng. Urban., 4 (2) 199-205, 2014.pdf

Study of slope stability and failure process of rock-fill barriers Original Article, C23 Ghaderi Nasab F, Amiri Tokaldany E, DavoudiM.H. Journal. Civil Eng. Urban. 3(4):142-149. 2013 ABSTRACT:A rock-fill barrier is an economical and effective structure for flood routing as well as stabilizing river bed and banks. Rock-fill barrier is a permeable and flexible structure and could resist against forces due to flow through and over flow from this structure. This study was carried out to investigate the failure process and providing criteria for slope stability of rock-fill barriers. Eighty-eight laboratory tests were performed in a flume with a longitudinal slope of 0.003 m/m, width of 0.6m, height of 0.8m and length of 14 m. A dimensional analysis technique was used to develop equations for calculating values of depth of flow in the upstream side of the barrier, the maximum flow under which a barrier remains stable, and evaluation for downstream stability of side slopes in terms of discharge, gradation of material, standard deviation of material size and upstream and downstream water depths. Data from laboratory tests were used to evaluate the results of the new equations. Using the criteria of mean relative error and root-mean-square error, it is found that there is a good accuracy of the equations introduced in this research. Keywords: Stability, Failure, Previous Barrier, Flood Control, Through-Flow And Over Flow Capacity منبع: [Hidden Content] دانلود: [Hidden Content].,23-142-149.pdf J. Civil Eng. Urban.,23-142-149.pdf

Stability of the Modified Euler Method for Nonlinear Dynamic Analysis of TLP International Journal Of MaritimeTechnology MR Tabeshpour, AA Golafshani, MS Seif منبع: [Hidden Content] Tabeshpour_..._Stability-of-the-Modified_2013_2.pdf