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پست تاریخ: شنبه 24 مرداد 1394 - 10:49    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

SEISMIC PERFORMANCE OF RC MOMENT RESISTING FRAME WITH STEEL, GFRP AND SMA-FRP REINFORCEMENT
Adeel Zafar1 and Bassem Andrawes2, A.M. ASCE
1Graduate Research Assistant, Dept. of Civil Engineering, University of Illinois at
Urbana-Champaign, USA. (zafar2@illinois.edu)
2Assistant Professor, Dept. of Civil Engineering, University of Illinois at Urbana-
Champaign, USA. (andrawes@illinois.edu)
Abstract
For the last century, steel has been used as a reinforcing material for most of the
reinforced civil engineering structures. Despite requisite stiffness, strength, ductility
and serviceability properties, steel reinforcing bars have shown deterioration over
time due to corrosion. Fiber reinforced polymer (FRP) reinforcing bars have been
used in concrete structures as alternate to conventional steel reinforcement, in order to
overcome corrosion problems. However, due to their linear elastic behavior, they are
not considered in structures which require ductility and damping characteristics. The
use of shape memory alloys (SMAs) with their nonlinear super-elastic behavior in the
composite could potentially provide solution for this problem. Small diameter superelastic
SMA wires, coupled with polymer matrix and FRP is sought in this research as
reinforcing bars in reinforced concrete (RC) moment resisting frames (MRFs) to
improve the performance of the frames in terms of reduced residual inter-storey drifts
and damage under quasi-static and seismic loading, while still maintaining the elastic
characteristics associated with FRP. The new SMA-FRP composite reinforcement is
placed at the plastic hinge region of the MRFs, where the nonlinearity is expected to
accumulate. A three storey one bay RC MRF prototype structure is designed with
steel reinforcement using equivalent static force procedure given in International
Building Code (IBC) for particular seismic hazard. The RC MRF is then modified by
replacing steel at the plastic hinge region in the beams with conventional Glass-FRP
(GFRP) and SMA-FRP composite reinforcement using design acceleration response
spectra achieved based on seismic demand. Incremental dynamic analysis is
conducted to investigate the behaviors of the frame with the three different
reinforcement types under a suite of ground motion records. From this study, it is
found that the frame with SMA-FRP composite reinforcement exhibits higher
performance levels including lower residual inter-storey drifts, high energy
dissipation to residual drifts ratio and thus lower damage, which is of essence for the
structures in high seismic zones.
Keywords: Fiber reinforced polymer, Shape memory alloys, Reinforced concrete,
Moment resisting frames, Performance based design, Incremental dynamic analysis
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عضو شده در: 7 مهر 1385
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تشکر: 3354
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پست تاریخ: چهار‌شنبه 4 شهریور 1394 - 17:41    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Performance of Precast Concrete Building Structures
S. K. Ghosh,a)
M.EERI and Ned M. Cleland,b)
M.EERI
The Precast/Prestressed Concrete Institute (PCI) sent an assessment team to
Chile, which visited the areas affected by the 27 February 2010 earthquake
between 26 and 30 April 2010. This paper reports on the team’s observations
on the performance of precast/prestressed concrete structures. The precast concrete
building systems observed by the PCI team generally performed well. In
some cases, the lateral force-resisting system performed satisfactorily, but the
absence or weakness of diaphragm framing resulted in local failures. Overall,
the PCI team found a mature and sophisticated precast concrete industry that
has successfully considered and solved issues of earthquake resistance without
some of the constraints imposed on U.S. practice by restrictive building code
provisions. [DOI: 10.1193/1.4000026]
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پست تاریخ: شنبه 28 شهریور 1394 - 08:31    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Non-linear seismic analysis and vulnerability evaluation of
a masonry building by means of the SAP2000 V.10 code

Laurent Pasticier1, § , Claudio Amadio2,‡ and Massimo Fragiacomo3,∗,†,‡
1Via Schiaparelli 8, 34143 Trieste, Italy
2Department of Civil & Environmental Engineering, University of Trieste, Piazzale Europa 1, 34121 Trieste, Italy
3Department of Architecture & Planning, University of Sassari, Piazza Duomo 6, 07041 Alghero, Italy
SUMMARY
The aim of the paper is to explore the possibilities offered by SAP2000® v.10, a software package with
user-friendly interface widely used by practising engineers, for seismic analyses of masonry buildings.
The reliability of the code was first investigated by carrying out static push-over (SPO) analyses of two
walls, already analysed by other researchers using advanced programs. The equivalent frame modelling
was employed in all analyses carried out. The code was then used to investigate the seismic performance
of an existing two-storey building typical of the north-east of Italy, with the walls being made of roughly
squared stones. An SPO analysis was performed first on the most significant wall, followed by a number
of time-history analyses aimed to evaluate the dynamic push-over curves. Finally, the seismic fragility
curves were derived, considering the seismic input as a random variable. Copyright q 2007 John Wiley
& Sons, Ltd.
Received 14 November 2006; Revised 12 July 2007; Accepted 5 October 2007
KEY WORDS: equivalent frame; fragility curves; incremental dynamic analysis; masonry building;
push-over analysis; SAP2000

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عضو شده در: 7 مهر 1385
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تشکر: 3354
تشکر شده 18617 بار در 8697 پست

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امتیاز: 210689
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پست تاریخ: پنج‌شنبه 2 مهر 1394 - 16:32    عنوان:   پاسخگویی به این موضوع بهمراه نقل قول

Applied Incremental Dynamic Analysis
Dimitrios Vamvatsikos and C. Allin Cornell

Abstract

We are presenting a practical and detailed example of how to perform incremental dynamic analysis (IDA), interpret the results and apply them to performance-based earthquake engineering. IDA is an emerging analysis method that offers thorough seismic demand and capacity prediction capability by using a series of nonlinear dynamic analyses under a multiply scaled suite of ground motion records. Realization of its opportunities requires several steps and the use of innovative techniques at each one of them. Using a nine-story steel moment-resisting frame with fracturing connections as a test bed, the reader is guided through each step of IDA: (1) choosing suitable ground motion intensity measures and representative damage measures, (2) using appropriate algorithms to select the record scaling, (3) employing proper interpolation and (4) summarization techniques for multiple records to estimate the probability distribution of the structural demand given the seismic intensity, and (5) defining limit-states, such as the dynamic global system instability, to calculate the corresponding capacities. Finally, (6) the results can be used to gain intuition for the structural behavior, highlighting the connection between the static pushover (SPO) and the dynamic response, or (7) they can be integrated with conventional probabilistic seismic hazard analysis (PSHA) to estimate mean annual frequencies of limit-state exceedance. Building upon this detailed example based on the nine-story structure, a complete commentary is provided, discussing the choices that are available to the user, and showing their implications for each step of the IDA.


Article Citation:
Dimitrios Vamvatsikos and C. Allin Cornell (2004) Applied Incremental Dynamic Analysis. Earthquake Spectra: May 2004, Vol. 20, No. 2, pp. 523-553.
doi: http://dx.doi.org/10.1193/1.1737737

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