Hybrid Control of Seismic-Excited Nonlinear and Inelastic Structural Systems
Author: J. N. Yang, Z. Li and A. Danielians . | Size: 40 MB | Format:PDF | Quality:Scanner | Publisher: NCEER | Year: 1991 | pages: 110 | ISBN: Technical Report NCEER-91-0020
PART I
TABLE OF CONTENTS
SECTION TITLE PAGE
1. INTRODUCTION I-I
2. FORMULATION 1-4
2.1 General Nonlinear or Hysteretic Structures 1-4
2.2 Instantaneous Optimal Control 1-7
2.3 Time-Variant Linear Systems 1-9
2.4 Instantaneous Optimal Control with 1-11
Acceleration and Velocity Feedback
2.5 Simulation of Controlled Response for 1-12
Hysteretic Structural System
3. NUMERICAL EXAMPLE 1-16
4. CONCLUSION I-54
5. REFERENCES I-55
APPENDIX A FOURTH-ORDER RUNGE-KUTTA METHOD I-59
APPENDIX B INSTANTANEOUS OPTIMAL 1-61
CONTROL ALGORITHMS
PART II
TABLE OF CONTENTS
SECTION TITLE PAGE
1. INTRODUCTION II-I
2. OPTIMAL CONTROL OF INELASTIC 11-3
STRUCTURAL SYSTEMS
2.1 Nonlinear Hysteretic Model for Inelastic Systems 11-3
2.2 Equations of Motion 11-3
2.3 Instantaneous Optimal Control 11-8
2.4 Sufficient Condition for Optimal Control 11-10
2.5 Estimation of Hysteretic Component Vector V 11-10
3. NUMERICAL EXAMPLE 11-12
4. CONCLUSIONS 11-28
5. REFERENCES 11-29
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Modeling and Seismic Evaluation of nonstructural components Testing Frame for Experimental Evaluation of Suspended Ceiling Systems
Author: Andrei M. Reinhorn, Ki-Pung Ryu and Giuseppe Maddaloni | Size: 10.5 MB | Format:PDF | Quality:Original preprint | Publisher: MCEER , University at Buffalo, State University of New York | Year: 2010 | pages: 184 | ISBN: Technical Report MCEER-10-0004
This report describes the development of a new testing facility for the evaluation of suspended ceilings and
other nonstructural components that can be used with single or tandem shake tables. The 20 × 50 ft test
frame was designed to simulate realistic ceiling performance correlated with the response observed during
real earthquakes. The frame has dynamic characteristics with variable frequencies to match those typicallyfound in fl oors (or roofs) with suspended ceilings. It was also designed to accommodate various structural
materials and different framing layouts. Analytical models were developed using SAP2000 to estimate the
dynamic properties and complete the design of the test frame. The combined designs of the physical frame
and the shake table motion allow for testing a variety of suspended systems while simulating realistic fl oor
motions and eliminating side effects due to wall distortions. Finally, procedures for motion design that can
be implemented in other experimental facilities are introduced.
--------------------
General TABLE OF CONTENTS
INTRODUCTION
TEST FRAME DESIGN
ANALYTICAL MODELING
DESIGN AND EVALUATION OF FRAME’S ROOF TESTING MOTION
COMPENSATION PROCEDURE FOR SHAKE TABLE SIMULATION
SUMMARY, CONCLUDING REMARKS AND RECOMMENDATIONS
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evaluation of seismic retrofit of reinfirced concrete structures , Part II - Experimental Performance and Analytical Study of a Retrofitted Structural Model
ABSTRACT
This report is Part II of a two part series on the evaluation ofseismic retrofit methods for concrete
frame structures. It deals with the behavior of the entire structural system when several retrofit
techniques are applied to individual components. An analytical and an experimental study was
done on a scaled model of a structure and several retrofit techniques were evaluated. Part I
describes the evaluation of individual components retrofitted and tested with cyclic loading,
thar provided the base for modeling of the entire structure presented in this report.
In this report the evaluation of three retrofit techniques, i.e., concrete jacketing method, masonry
jacketing method, and partial frame masonry inf1ll, is presented based on an analytical study of
retrofitting a typical lightly reinforced frame designed according to ACI 318-89 only for gravity
loads (I.4D + L7L).
The jacketing technique is further evaluated based on an experimental and analytical study using
a 1:3 scale structural model subjected to simulated earthquake motion supplied by the seismic
simulator (shaking table) at SUNY/Buffalo.
The (jacketing) technique was applied only to selective portions of the structure, and it achieved
the limited improvement of strength and damage control as required in moderate seismicity
areas and as anticipated. This selected retrofit required only minimal structural interference
and may prove to be economically attractive.
The analytical modeling, based on component infonnation (obtained from the study presented
in Part I of this report series), shows that the overall response of retrofitted structures can be
adequately estimated, if good infonnation is available for the components.
---------------------------
General TABLE OF CONTENTS
INTRODUCTION.
RETROFIT OF GLD RIC FRAME STRUCTURES.
EXPERIMENTAL STUDY OF RETROFITTED R/C MODEL.
PERFORMANCE OF RETROFITTED R/C MODEL DURING
EARTHQUAKES.
CONCLUDING REMARKS.
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Posted by: mary - 11-15-2012, 01:16 PM - Forum: Archive
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Hi
Soil stress field around driven piles
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Centrifugal model testing of foundation piles in axial loading
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Posted by: giguni - 11-15-2012, 11:11 AM - Forum: Archive
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New formulas derived from seismic interferometry to simulate phase velocity estimates from correlation methods using microtremor
Toshiaki Yokoi
Geophysics July 2010 v. 75 no. 4 p. SA71-SA83
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Posted by: andersen3 - 11-15-2012, 10:53 AM - Forum: Concrete
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Effect of adhesive stiffness and CFRP geometry
Author: Reeve Benjamin Zachary | Size: 2.54 MB | Format:PDF | Quality:Original preprint | Publisher: University of Pittsburgh | Year: 2005 | pages: 110
The current American Concrete Institute (ACI) recommendation intended to mitigate
debonding failure by limiting the allowable strain in the FRP (the limiting strain is referred to as
εfub) is shown to be non-conservative, overestimating the strain where debonding becomes likely
by two fold for the high modulus adhesive and less so for the low modulus adhesive. The
equation for estimating εfubrecommended by Teng et al. (2001), including the modifying kbterm,
appears to provide appropriatelyconservative estimates of debonding for the specimens having
low modulus adhesive although remains unconservative for the high modulus adhesive. This
indicates that the nature of the adhesive should be included in the calculation of limiting strain.
Proposed values for the coefficient kwhich accounts for the b b f/b ratio were found to generally
underestimate the effect of the width ratio for the test specimens. Therefore, not only is the ratio
bf/b (as represented by kb) a contributing factor to bond behavior, its contribution may be
underestimated. Cover delamination (end peel debonding) was effectively mitigated in all
specimens by extending the CFRP close to the support along the relatively long shear span.
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Author: Hayward, Alan / Weare, Frank / Oakhill, A. C. | Size: unknown MB | Format:PDF | Quality:Unspecified | Publisher: Wiley-Blackwell | Year: 2011 | pages: 184-192
This highly illustrated manual provides practical guidance on structural steelwork detailing. Examples of structures include single and multi-storey buildings, towers and bridges. The detailing shown will be suitable in principle for fabrication and erection in many countries, and the sizes shown will act as a guide to preliminary design. The third edition has been revised to take account of the new Eurocodes on structural steel work, together with their National Annexes. The new edition also takes account of developments in 3-D modelling techniques and it includes more CAD standard library details.
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Concrete Repair, Rehabilitation and Retrofitting III - REQUEST
Author: Mark G. Alexander, Hans-Dieter Beushausen, Frank Dehn, Pilate Moyo | Size: unknown MB | Format:PDF | Quality:Unspecified | Publisher: CRC Press | Year: 2012 | pages: 546
The Third International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR 2012) was held in Cape Town, South Africa, from 3 to 5 September 2012. The conference was the latest in a sequence of ICCRRR international conferences, the two previous ones having also been held in Cape Town in 2005 and 2008. It was again a collaborative venture of the Universities of Cape Town and The Witwatersrand, and the Construction Materials Sections at Leipzig University and MFPA Leipzig in Germany.
The conference was also an occasion to honour the considerable achievements of Professor Joost Walraven of TU Delft who has made, as a researcher and as an engineer, outstanding and international contributions to the development and application of new construction materials, new structures, and structural models.
This 3rd ICCRRR was held in conjunction with the Annual RILEM Week – marking the first time that RILEM had held its annual event in sub-Saharan Africa. The African continent is on the move, and the next decades will provide great opportunities for expansion on this continent of science and technology, industry and culture. For this reason, it was timely that the RILEM Week was held in Cape Town.
Considerable progress has been made in recent years in understanding deterioration mechanisms for concrete, and in repair and rehabilitation technologies. Nevertheless, a vast stock of concrete infrastructure worldwide remains in a serious state of disrepair, and substantial work is needed to maintain and possibly restore it to acceptable levels of service, cost-effectively. Confidence in concrete as a viable construction material must be retained and sustained, particularly considering the environmental challenges that the industry and society now face.
The conference proceedings contain papers presented at the conference, classified into a total of 12 sub-themes which can be grouped under the five main themes of (i) Concrete durability aspects, (ii) Condition assessment of concrete structures, (iii) Concrete repair, rehabilitation and retrofitting, (iv) Developments in materials technology, assessment and processing, and (v) Concrete technology and structural design. In terms of submissions, major foci of interest are the fields of innovative materials for durable concrete construction, integrated service life modelling of reinforced concrete structures, NDE/NDT and measurement techniques, repair methods and materials, and structural strengthening and retrofitting techniques. The large number of high-quality papers presented and the wide range of relevant topics covered confirm that these proceedings will be a valued reference for many working in the important fields of concrete durability and repair, and that they will form a suitable basis for discussion and provide suggestions for future development and research.
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