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SEISMIC DESIGN AND RETROFIT OF BRIDGES PDF

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SEISMIC DESIGN AND. RETROFIT OF BRIDGES. Presented by: University of California at Berkeley. Department of Civil Engineering. Earthquake Engineering . M. J. N. Priestley, F. Seible, G. M. Calvi-Seismic Design and Retrofit of Bridges- Wiley-Interscience () - Ebook download as PDF File .pdf) or read book. Seismic Design and Retrofit of Bridges - Ebook download as PDF File .pdf) or read book online.


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Because of their structural simplicity, bridges tend to be particularly vulnerable to damage and even collapse when subjected to earthquakes or. Request PDF on ResearchGate | Seismic Design and Retrofit of Bridge | Introduction Constraints Seismic Design Alternatives Deep-Valley-Crossing. significant advance in bridge seismic design and retrofitting. Seismic retrofitting has been conducted for over 27, reinforced concrete columns, which.

Longitudinally a restraining system of struts-ties is applied, while transversely a ties-only. Generally, retrofit solutions aim on complying with the safety inequality [1], Eq. Various retrofit methods have been developed [2], which can be summarized in two retrofit philosophies depending on the focus of each procedure on the first or second term of Eq. The first retrofit philosophy which is the direct approach involves methods that are applied on the as-built bridge components with the objective to increase their capacity against the seismic loads. For instance, these methods include pier retrofit with steel or concrete jackets or FRP materials, [3].

The longitudinal and transverse retrofit systems were studied for various parameters Olga Markogiannaki, Ioannis Tegos, Spyridon Vasileiou 5 in order to identify their efficiency in limiting seismic movements.

Bridges seismic retrofit of pdf and design

The properties of the systems used for the study are presented in Table 1. Force- Displacement relationships are based on the bilinear steel material law and were assigned to nonlinear springs of equivalent stiffnesses, Fig.

For the transverse retrofit the tension-only system is simulated as a struts-ties system with half the stiffness of the real one. The minimum length of the longitudinal bars is determined based on the condition that the steel bars remain elastic under serviceability loading,[7].

The transverse springs correspond to the horizontal component of the ties stiffness. The seismic analyses were conducted using five artificial accelerograms complying with zones I and II spectra.

Figure 3. For the longitudinal response, a number of various steel bundle properties was studied for evaluating bridge responses. In addition, larger lengths result in a small reduction in the efficiency of the retrofit. An increase in length would be advantageous if the stresses on the steel bundles and the forces transferred to the structure at the abutments, respectively, had to be reduced. In Fig 6. Both cases indicate that the initial bridges designed for seismic zone I can be upgraded to seismic zone II with the proposed retrofit solution for longitudinal earthquake direction.

Movement reduction 3-spans bridge a seismic level I b seismic level II a b Figure 6. Respective reductions are observed in Fig. Although the use of larger cross sections results in higher reductions, the large forces transferred to the micro-piles anchorage, Table 2, indicates that it is preferable to use smaller cross sections and take advantage of the yielding of the steel bars when smaller reductions are required. It should be pointed out that the retrofit solutions bring the maximum seismic demand of the Olga Markogiannaki, Ioannis Tegos, Spyridon Vasileiou 7 piers to the level of their capacity for seismic intensity of 0.

For this purpose, two independent seismic movement restraining systems were used; one consisting of struts-ties for the longitudinal direction and the other consisting of ties-only for the transverse.

The first achieved a decrease in the seismic demand of the piers by the transfer of part of the seismic forces to the abutments and the embankment, while the second reached the seismic demand decrease by transferring seismic forces to the existing foundation. Therefore, regarding the longitudinal requirements, the surplus of the seismic actions was driven through the use of the appropriate restraining system to new structures behind the abutments and, similarly, for the transverse direction the surplus was driven to the retrofitted foundation.

July, pp. June, pp. Related Papers.

Seismic Design and Retrofit of Bridges

The steel bars are placed at appropriate distances, so as to avoid any disruptions with each other, in a length equal to the transverse dimension of the pile-cap. The steel bars can receive only tension loading when the bridge is transversely excited since they are not protected for receiving compression loading.

However, the activation of the retrofit system can be achieved for both transverse earthquake directions because the ties are placed crosswise, bars 1 and 2 in Fig. The seismic forces 4 Proceedings IBSBI transferred by their anchorages are received safely by the micro-pile series while the forces at the deck do not arise any response issues.

Figure 2. The end spans are The deck is a concrete box section, connected to the piers rigidly and is supported on the abutments by sliding bearings of low friction. The piers are circular and are founded on 3x3 pile groups.

Retrofit and bridges of design pdf seismic

The bridge is founded on ground type B and the area is in seismic zone I, [9]. Bridge members are modeled with frame elements with material nonlinearities. The section analysis for the assignment of concentrated plasticity hinges at the top and bottom of piers was performed with Bomber-Biaxial,[11], Fig. The foundation springs were provided by the geotechnical report. The passive resistance of the abutments due to embankment mobilization was simulated according to Shamsabadi guidelines [12],[13] and the HyperbolicGap compression material was used in OpenSees, as shown in Fig.

The longitudinal and transverse retrofit systems were studied for various parameters Olga Markogiannaki, Ioannis Tegos, Spyridon Vasileiou 5 in order to identify their efficiency in limiting seismic movements. The properties of the systems used for the study are presented in Table 1.

Force- Displacement relationships are based on the bilinear steel material law and were assigned to nonlinear springs of equivalent stiffnesses, Fig.

For the transverse retrofit the tension-only system is simulated as a struts-ties system with half the stiffness of the real one. The minimum length of the longitudinal bars is determined based on the condition that the steel bars remain elastic under serviceability loading,[7].

The transverse springs correspond to the horizontal component of the ties stiffness. The seismic analyses were conducted using five artificial accelerograms complying with zones I and II spectra.

Seismic Design of Buildings and Bridges

Figure 3. For the longitudinal response, a number of various steel bundle properties was studied for evaluating bridge responses. In addition, larger lengths result in a small reduction in the efficiency of the retrofit.

Other applications. Tuned liquid dampers. Applications to building slabs and pedestrian and road bridges 5. Eligible themes are seismic designs or retrofits of actual building or bridges, or other relevant theoretical or applied studies.

It is strongly recommended that the selected subject is closely related to the professional interests of the attendants. Hysteretic devices. Buckling-restrained braces.

Seismic Design of Buildings and Bridges - PDF Free Download

Steel walls. Friction devices. Viscous and viscoelastic devices. VD walls.

Pdf and of design seismic retrofit bridges

Use of SMA. Other dissipators Noticeably, some of these Theses consisted in developing general design and construction solutions that can be utilized in a wide set of situations. Online teaching uses the Adobe Connect Technology; this software allows listening, viewing, recording, chatting and interacting with the instructors and the other attendants.

Attendants will use the My Tech Space virtual campus, an effective working and communication platform. This campus provides access to the teaching documentation, allows creating virtual personal spaces, includes forum or e-mail communication tools, facilitates team-working and discussions, among other capabilities. Since this program is strongly professionallyoriented, theory sessions are mainly based on practical examples.

Both types of sessions are divided in twenty-minute intervals. Each interval finishes with the proposal of an exercise or one question, and next interval begins with its answer and solution. This scheme lets attendants assessing continuously their progression. In the computer applications sessions, actual examples are worked out from the very beginning to the final design details. These examples are new buildings, retrofitted buildings, high-rise buildings, bridges, base isolation, among others.

Attendants are asked to use the same software than the instructor, thus being able to obtain parallel results. Students can ask questions any time, such enquiries will be answered at the earliest availability. A number of synchronous online interactive open sessions will be planned depending on needs of participants.

Professors will mainly organize sessions but students can ask also for additional sessions. Professors attend these sessions and students pose questions and address their concerns; as well, relevant issues are discussed.

Each synchronous session lasts approximately three hours, being scheduled according geographic location of students. FORUMS A number of forums will be created to boost the attendants and to allow for open discussions on case studies, and asking questions, among other learning and evaluation activities.

This includes teaching notes, scientific and technical papers and reports, books, design codes, worked examples, excel or MatLab files, SAP and ETABS files and other relevant information. Ordinarily, this process will require extensive use of software codes. Customary language will be english but, eventually, questions can be asked and answered in arabic, french, italian and spanish. Wide lecturing experience in many subjects linked to Structural Analysis and Design.

He has supervised 15 Doctoral Theses, most of them related to earthquake engineering. He is the author of more than research papers published in scientific journals and presented at national and international scientific conferences.

He has participated in numerous research projects national and international financed by public and private funds, having been a promoter and coordinator in many of them.

His research is on advanced numerical simulation of the dynamic structural behavior of buildings that are heavily damaged by earthquakes. Ten years of experience in analysis, design, construction, and supervision of civil engineering structures high rise buildings, industrial facilities, residential and defense projects, etc. Relevant experience on nonlinear seismic analysis for practical and scientific purposes. Partner and developer at SESPID, specialized in developing engineering software for automated detailing and optimization.

Wide teaching experience in teaching professional courses for civil engineers and architects. Presently working as a structural consultant in Barcelona.

He has participated in 10 research projects, most of them international, taught courses and lectures at universities and research centers in Europe Lisbon, London, Utrecht, Wroclaw and Latin America Caracas, Mexico, Santiago de Chile among others. He has written 6 books, over 15 scientific papers, monographs, and other documents.

Coordinator of technical assistance team after Lorca earthquake Spain. Alfredo Arnedo Pena BEng.

Seismic Retrofit of Bridges - A Short Course

Wide teaching experience in many subjects linked to Steel Structures. Professional experience in seismic design, protection against impact and explosions SENER - present.

Spanish delegate to the committee of Eurocode 3 Part 1.