Seismic Performance of Strength Degraded Structures
Author: Rupali S Bhamare , Bidur Kafle , Nelson Lam , John Wilson , Emad Gad | Size: 423 KB | Format:PDF | Quality:Unspecified | pages: 11
ABSTRACT:
Traditionally, performance assessment of a structure is based on trading off strength demand with
ductility demand. In high seismicity region, the design provisions are based on the concept of conservation
of energy; such guidelines (FEMA 273) recommend a very low drift capacity for strength
degraded structures. Furthermore, the application of these guidelines, results in most of the strength
degraded structures deemed unsafe when subjected to earthquake excitations in low and moderate
seismic regions. This paper presents results of nonlinear time history analyses (THA) for such
strength degraded structures for a range of near-field and far-field earthquake scenarios of different
M-R combinations. Fragility curves defining probability of failure of structures have been developed.
The insensitivity of the probability of failure of the URM wall on its height (i.e. vertical span
length) is an interesting finding in this study. Also, the extent of strength degradation in an unreinforced
masonry wall is not shown to have increased its probability of failure.
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Author: Paul Ndumbaro, Peter Broughton | Size: 12 MB | Format:PDF | Quality:Scanner | Publisher: Thomas Telford Publishing | Year: 1995 | pages: 98 | ISBN: 978-0727720085
This book provides sound practical guidance on cable and catenary structural systems. In a clear and concise manner it deals with the complicated subject of exact formulation in the theoretical treatment of these systems when subjected to large charges in geometry.
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Abstract. The applicability of nonlinear static procedures for estimating seismic demands of typical regular RC moment-resisting frames is evaluated. This work, conducted within the framework of the ATC-76-6 project, shows the degree to which nonlinear static methods can characterize global and
local response demands vis-à-vis those determined by nonlinear dynamic analysis for three RC mo-ment frame buildings. The response quantities (engineering demand parameters) considered are peak story displacements, story drifts, story shears and floor overturning moments. The single-mode push-
over methods evaluated include the N2 and the ASCE-41 coefficient methods. Multi-modal pushover methods such as the Modal Pushover Analysis and the Consecutive Modal Pushover method also were evaluated. The results indicate that the relatively good performance of the single-mode methods observed for low-rise buildings rapidly deteriorates as the number of stories increases. The multi- mode techniques generally extend the range of applicability of pushover methods, but at the cost of additional computation and without ensuring reliability of the results.
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SIMPLIFIED P-y RELATIONSHIPS FOR MODELING EMBANKMENT- ABUTMENT SYSTEMS OF TYPICAL CALIFORNIA BRIDGES
Author: SEXTOS, Anastasios , MACKIE, Kevin , STOJADINOVIC , Bozidar and TASKARI, Olympia | Size: 1.4 MB | Format:PDF | Quality:Unspecified | Publisher: The 14 World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China | Year: 2008 | pages: 08
The flexibility οf the embankment-abutment stiffness has been found to drastically effect the seismic response
of the entire bridge, typically depending on the intensity of earthquake ground motion, but also on the
geometrical and mechanical properties of embankment-abutment system. Consequently, significant effort has
been made to incorporate the nonlinear behavior of the lateral support of the deck primarily through inelastic
static (pushover) analysis. However, the difficulties in modeling the nonlinear behavior of soil as well as the
computationally demanding three-dimensional geometry often lead to the disregard of some sources of
nonlinearity such as those associated with the foundation soil and the boundary conditions at bridge abutments.
Along these lines, the scope of this paper is to model and study the nonlinear response of six typical Californian
abutment-embankment systems to derive specific force-deflection (i.e., P-y) relationships as a function of
foundation soil properties, abutment type, and embankment geometry within the framework of an alternative
simplified method proposed by Kappos et al. (2007). Comparative assessment of the current Caltrans guidelines
is also performed and design recommendations are made.
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513 Seismic damage assessment for six RC bridges in the Veneto region (NE Italy)
Author: P. FRANCHETTI , M. GRENDENE , D. SLEJKO and C. MODENA | Size: 3 MB | Format:PDF | Quality:Unspecified | Publisher: Bollettino di Geofisica Teorica ed Applicata Vol. 49, n. 3-4, pp. 513-531; September-December 2008 | Year: 2008 | pages: 19
Seismic damage on six bridges in the Veneto region (NE Italy) is estimated by means of a probabilistic approach for seismic hazard assessment and by constructing the specific fragility curve for each bridge. Construction of fragility curves is based on
various approaches from literature. With the application of the best-performing approach on the six bridges a comparative preliminary evaluation of the expected damage on the bridges was done. However, as the methodology is general, it could easily be applied to bridges of an extensive number of road networks.
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This book provides senior undergraduate students, master students and structural engineers who do not have a background in the field with core knowledge of structural earthquake engineering that will be invaluable in their professional lives. The basics of seismotectonics, including the causes, magnitude, and intensity of earthquakes, are first explained. Then the book introduces basic elements of seismic hazard analysis and presents the concept of a seismic hazard map for use in seismic design. Subsequent chapters cover key aspects of the response analysis of simple systems and building structures to earthquake ground motions, design spectrum, the adoption of seismic analysis procedures in seismic design codes, seismic design principles and seismic design of reinforced concrete structures. Helpful worked examples on seismic analysis of linear, nonlinear and base isolated buildings, earthquake-resistant design of frame and frame-shear wall systems are included, most of which can be solved using a hand calculator.
Features:
-Covers the seismic hazard, the basics of seismotectonics, and the fundamentals of earthquake engineering
-Meets the future professional needs of senior undergraduate students by explaining the principles of earthquake-resistant design
-Includes useful sample problems on earthquake-resistant design of frame and frame-shear wall systems
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Posted by: netsonicyxf - 06-03-2014, 03:44 AM - Forum: Archive
- No Replies
Article/eBook Full Name: Tension Structures: Behavior and Analysis
Author(s): John W. Leonard
Publish Date: 1987
ISBN: 978-0070372269
Published By: Mcgraw-Hill (Tx)
Related Links:
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Article/eBook Full Name: The Analysis of Cable and Catenary Structures
Author(s): Paul Ndumbaro, Peter Broughton
Publish Date: 1995
ISBN: 978-0727720085
Published By: Thomas Telford Publishing
Related Links:
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Author: Nasr Younis Abboushi | Size: I "19", II "29" MB | Format:PDF | Quality:Original preprint | Publisher: Palestine Polytechnic University | Year: 2013-2014 | pages: I "188", II "282"
ACI 318M-08 Reinforced Concrete I & II
by Nasr Younis Abboushi
ACI 318M-08 Reinforced Concrete I
CHAPTER 1 REINFORCED CONCRETE STRUCTURES
CHAPTER 2 MATERIALS AND PROPERTIES
CHAPTER 3 DESIGN METHODS AND REQUIREMENTS
CHAPTER 4 FLEXURE IN BEAMS
CHAPTER 5 SHEAR IN BEAMS
CHAPTER 6 COLUMNS: COMBINED AXIAL LOAD AND BENDING
CHAPTER 7 SLENDER COLUMNS
ACI 318M-08 Reinforced Concrete II
CHAPTER 8 ONE-WAY SLABS
CHAPTER 9 TWO-WAY SLABS
CHAPTER 10 STAIRS
CHAPTER 11 FOOTINGS AND FOUNDATIONS
CHAPTER 12 DEVELOPMENT, ANCHORAGE, AND SPLICING OF REINFORCEMENT
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