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دانلود مقالات انگلیسی گرایش سازه رفتن به صفحه : قبلی  1, 2, 3, 4, 5, 6, 7, 8, 9  بعدی
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:48    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Threat-Independent Column Removal and Fire-Induced Progressive Collapse: Numerical Study and Comparison
Article 9, Volume 48, Issue 1, June 2015, Page 121-131 XML PDF (522 K)
Document Type: Research Paper
Authors
1 Hamidreza Tavakoli ; 2 Foad Kiakojouri
1Assistant Professor, Department of Earthquake Engineering, Babol University of Technology, Babol, Iran
2M.Sc. of Structural Engineering, Department of Structural Engineering, Islamic Azad University, Takestan Branch, Iran
Abstract
Progressive collapse is defined as the spread of an initial failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. The current progressive collapse analyses and design methods in guidelines and codes focus on the alternate load path method. This method is suitable especially in the case of blast-induced progressive collapse. In this paper, fire-induced and threat-independent progressive collapse potential is numerically investigated in steel moment resisting frames. Affecting parameters such as location of initial failure and number of floors are considered in this study. Two different mechanisms were observed in threat-independent and fire-induced progressive collapse: while in threat-independent column removal alternative load paths play major role, in fire-induced progressive collapse the weight of the structure above the failure region is the most important parameter.
Keywords
Alternative Load Path; Column Removal Analysis; Dynamic Nonlinear Analysis; Fire; Progressive Collapse
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:50    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Two New Quadrilateral Elements Based on Strain States
Article 10, Volume 48, Issue 1, June 2015, Page 133-156 XML PDF (1050 K)
Document Type: Research Paper
Authors
1 Mohammad Rezaiee-Pajand ; 2 Majid Yaghoobi
1Professor, Civil Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran
2Ph.D. Candidate, Civil Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran
Abstract
In this paper, two new quadrilateral elements are formulated to solve plane problems. Low sensitivity to geometric distortion, no parasitic shear error, rotational invariance, and satisfying the Felippa pure bending test are characteristics of these suggested elements. One proposed element is formulated by establishing equilibrium equations for the second-order strain field. The other suggested element is obtained by establishing equilibrium equations only for the linear part of the strain field. The number of the strain states decreases when the conditions among strain states are satisfied. Several numerical tests are used to demonstrate the performance of the proposed elements. Famous elements, which were suggested by other researchers, are used as a means of comparison. It is shown that these novel elements pass the strong patch tests, even for extremely poor meshes, and one of them has an excellent accuracy and fast convergence in other complicated problems.
Keywords
Equilibrium Conditions; Optimization Criteria; Plane Problems; Quadrilateral Elements; Strain States
Reference
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پست تاریخ: دوشنبه 15 تیر 1394 - 02:55    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Development and Practical Application of a Bridge Management System (J-BMS) in Japan
Article 13, Volume 48, Issue 1, June 2015, Page 189-216 XML PDF (1460 K)
Document Type: Research Paper
Authors
1 Ayaho Miyamoto ; 2 Minoru Motoshita
1Professor, Yamaguchi University, Ube, Japan
2B.Sc., Kyowa Sekkei CO., LTD., Kobe, Japan
Abstract
This paper presents a new bridge management system (J-BMS). It is integrated with a concrete bridge rating expert system that can be used to evaluate the serviceability of existing concrete bridges. The proposed J-BMS not only evaluates the performance of bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. In this system, the genetic algorithm (GA) technique was used to search for an approximation of the optimal maintenance plan. This was constructed using Visual Basic and the C language. Furthermore, this paper examines the results of applying this system to some in-service bridges and the results of questionnaire surveys of experts. A comparison of these results shows that this system can accurately predict optimal maintenance planning, as well as bridge rating.
Keywords
Bridge Management System (J-BMS); Concrete Bridge Rating Expert System (BREX); information technology; Integrated Lifetime Management; RC Bridge
Reference
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امتیاز: 210699
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پست تاریخ: شنبه 27 تیر 1394 - 16:03    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Behavior of coupled shear walls with buckling-restrained steel plates in high-rise buildings under lateral actions
Haijiang Wang1, Guoqiang Li1,2* and Xiaokun Huang3
1College of Civil Engineering, Tongji University, Shanghai 200092, China
2State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
3China Academy of Building Research, Beijing 100013, China
SUMMARY
Traditional coupling beams in coupled shear walls (CSWs) may be lack of required ductility or inconvenient
to be fully repaired or replaceable after earthquake damage. To improve the CSW seismic performance, a
type of new structural system, which is referred to as coupled shear walls with buckling-restrained steel plates
(CSW–BRSP), is proposed and thoroughly studied. In the system, a pair of individual concrete wall is
coupled through buckling-restrained steel plates instead of traditional concrete coupling beams. Based on
the continuous medium method (CMM), stiffness and strength design formulas are developed for the seismic
design of this system. Intensive investigations have been conducted to assess the undesirable axial forces in
the buckling-restrained steel plates induced by lateral loads. In order to facilitate the application of this system,
a detailed design procedure is also explicitly stated. Finally, an example of typical high-rise building is
presented to illustrate the design procedure as well as demonstrate the excellent seismic performance of the
proposed system by means of nonlinear time-history analysis. Copyright © 2015 John Wiley & Sons, Ltd.
Received 24 September 2014; Revised 18 March 2015; Accepted 28 May 2015
KEY WORDS: coupled shear wall; buckling-restrained shear wall; high-rise buildings; seismic design; nonlinear timehistory
analysis; continuous medium method

THE STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS
Struct. Design Tall Spec. Build. (2015)
Published online in Wiley Online Library (wileyonlinelibrary.com/journal/tal). DOI: 10.1002/tal.1226

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 22:41    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

FE AND SIMPLIFIED MODELS OF STEEL PLATE SHEAR WALL
By Robert G. Driver; Member, ASCE, Geoffrey L. Kulak,2 Fellow, ASCE,
Alaa E. Elwi/ Member, ASCE, and D. J. Laurie Kennedy/ Fellow, ASCE
ABSTRACT: A nonlinear finite-element model for steel plate shear walls was developed and th<;n tested using
the as-built dimensions and measured material properties of a large-scale four-story test specImen. When a
nonplanar initial plate geometry and measured residual stresses were includ~d.in the model: it gave an excellent
prediction of the load versus deflection response. Furthermore, a good predIcnon of the ulnmate .strength of ~e
shear wall was obtained even when the second-order effects were neglected. Another analyncal method IS
presented that is useful for the prediction of monotonic behavior. In this relatively si~p~e plane frame ~odel,
the infill plate is represented as a series of tension strips. The model gave a good pre~c~lOn of the behaVIOr ~f
the four-story shear wall specimen. An associated hysteresis model also gave good predICtiOnS of observed cycltc
behavior. The models account for inelastic behavior in both the infill panels and the frame members.

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 22:59    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

DRIFT DESIGN OF STEEL-FRAME SHEAR-WALL SYSTEMS FOR TALL BUILDINGS
HYO SEON PARK1*, KAPPYO HONG1 AND JI HYUN SEO2
1Department of Architectural Engineering, Yonsei University, Shinchon-dong, Seoul 120-749, Korea
2Daewoo Institute of Construction Technology, Songjuk-dong, Suwon 440-210, Korea
SUMMARY
Drift design methods based on resizing algorithms are presented to control lateral displacements of steel-frame
shear-wall systems for tall buildings. Three algorithms for resizing of structural members of the steel-frame shearwall
systems are derived by formulating the drift design process into an optimization problem that minimizes
lateral displacement of the system without changing the weight of a structure. During the drift design process,
cost-effective displacement participation factors obtained by the energy method are used to determine the amount
of material to be modified instead of calculating sensitivity coefficients. The overall structural design model with
the drift design method for the steel-frame shear-wall systems is proposed and applied to the structural design of
three examples. As demonstrated in the examples, the lateral displacement and interstorey drift of a frame shearwall
system can be effectively designed by the drift design method without the time-consuming trial-and-error
process. Copyright  2002 John Wiley & Sons, Ltd.

_________________
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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 23:04    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

admin نوشته است:
DRIFT DESIGN OF STEEL-FRAME SHEAR-WALL SYSTEMS FOR TALL BUILDINGS
HYO SEON PARK1*, KAPPYO HONG1 AND JI HYUN SEO2
1Department of Architectural Engineering, Yonsei University, Shinchon-dong, Seoul 120-749, Korea
2Daewoo Institute of Construction Technology, Songjuk-dong, Suwon 440-210, Korea
SUMMARY
Drift design methods based on resizing algorithms are presented to control lateral displacements of steel-frame
shear-wall systems for tall buildings. Three algorithms for resizing of structural members of the steel-frame shearwall
systems are derived by formulating the drift design process into an optimization problem that minimizes
lateral displacement of the system without changing the weight of a structure. During the drift design process,
cost-effective displacement participation factors obtained by the energy method are used to determine the amount
of material to be modified instead of calculating sensitivity coefficients. The overall structural design model with
the drift design method for the steel-frame shear-wall systems is proposed and applied to the structural design of
three examples. As demonstrated in the examples, the lateral displacement and interstorey drift of a frame shearwall
system can be effectively designed by the drift design method without the time-consuming trial-and-error
process. Copyright  2002 John Wiley & Sons, Ltd.

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 23:32    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 23:34    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Characteristics of the wall-frame interaction in steel plate shear walls
H.R. Habashi, M.M. Alinia
Department of Civil Engineering, Amirkabir University of Technology, Tehran, Iran
a r t i c l e i n f o
Article history:
Received 27 June 2009
Accepted 11 September 2009
Keywords:
Shear wall
Dual system
Interaction
Infill plates
a b s t r a c t
The nonlinear response of steel plate shear wall (SPSW) dual systems under lateral loading with regard
to the interaction between the infill plates and frame members is studied. A number of SPSWs are
numerically analyzed and the results are utilized to discuss (a) the influence of infill plates on the behavior
of frames and (b) to evaluate their degree of effectiveness in resisting lateral loads. Results show that
SPSWs designed according to design codes should have desirable sequences of yielding and that plastic
deformations should primarily be provided by the infill plates. It is illustrated that the infill plates are
very effective in the initial stages of loading (up to the drift angle of 1%) and absorb substantial part of
storey shear. However, once diagonal yield zones develop in the infill plates, they begin to lose their
effectiveness; and when yield zones spread throughout the wall, additional applied loads are essentially
carried by the frame members.

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پست تاریخ: پنج‌شنبه 8 مرداد 1394 - 23:39    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

CYCLIC BEHAVIOR OF AN INNOVATIVE STEEL SHEAR WALL SYSTEM
Qiuhong ZHAO1 and Abolhassan ASTANEH-ASL2
SUMMARY
Steel shear walls have been used more frequently in recent years as the lateral load-resisting system in the
design and retrofit of high-rise buildings. This paper concentrates on the experimental studies of an
innovative steel shear wall system used in buildings in USA and presents a summary of test results.
Steel plate shear wall system studied herein consists of steel plate shear walls placed inside a multi-bay
steel moment frame. In this system, steel walls are welded to the boundary steel moment frame. The steel
moment frame consists of very large concrete filled steel tubes (CFT) at the edges, internal wide flange
(WF) columns, and horizontal WF beams. Most of the gravity is resisted by the CFT columns, and lateral
loads are resisted by the dual system consisting of the moment frame and the steel shear wall.
Cyclic static tests were conducted on two half-scale specimens representing this system with different
span-to-height ratio for the steel wall panels. Both specimens showed highly ductile and stable inelastic
behavior, in the sense that they were able to tolerate more than 30 cycles of inelastic shear displacements
before reaching an inter-story drift more than 0.03. Inter-story drift herein is defined as lateral movement
of the floor divided by the story height. Throughout the test, the gravity load carrying CFT’s remained
essentially elastic while non-gravity carrying lateral load resisting elements underwent well-distributed
and desirable yielding. The experimental results and their implication in seismic design are summarized
and discussed.

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