Concrete Structures in Earthquake

Concrete Structures in Earthquake
Author: Thomas T. C. Hsu
Publisher: Springer
Total Pages: 410
Release: 2019-01-21
Genre: Technology & Engineering
ISBN: 9811332789

This book gathers 23 papers by top experts from 11 countries, presented at the 3rd Houston International Forum: Concrete Structures in Earthquake. Designing infrastructures to resist earthquakes has always been the focus and mission of scientists and engineers located in tectonically active regions, especially around the “Pacific Rim of Fire” including China, Japan, and the USA. The pace of research and innovation has accelerated in the past three decades, reflecting the need to mitigate the risk of severe damage to interconnected infrastructures, and to facilitate the incorporation of high-speed computers and the internet. The respective papers focus on the design and analysis of concrete structures subjected to earthquakes, advance the state of knowledge in disaster mitigation, and address the safety of infrastructures in general.

Post-earthquake Evaluation and Emergency Repair of Damaged RC Bridge Columns Using CFRP Materials

Post-earthquake Evaluation and Emergency Repair of Damaged RC Bridge Columns Using CFRP Materials
Author: Ashkan Vosooghi
Publisher:
Total Pages: 742
Release: 2010
Genre: Carbon fiber-reinforced plastics
ISBN: 9781124404332

The main objective of the study was to develop a rapid and effective repair method using carbon fiber reinforced polymer (CFRP) materials for earthquake-damaged reinforced concrete bridge columns. This study consisted of three main phases. In the first phase, a data base of 33 test columns was developed and analyzed and five distinct apparent seismic damage states were defined. The damage states were correlated to measured seismic response parameters in terms of drift, frequency, strains, and yield and ultimate displacements. Fragility curves were developed and applied for two case studies in performance-based design (PBD) and performance-based assessment (PBA) of bridge columns. Comprehensive experimental and analytical studies were conducted in the second phase of the study. Two standard single columns, one standard two-column bent, and two substandard columns were tested on a shake table, repaired using CFRP fabrics, and retested on the shake table to evaluate the proposed repair procedure. The measured data were extensively analyzed to investigate the performance of the repaired columns compared to the original column responses. It was concluded that the strength and ductility of the standard columns were successfully restored and those of sub-standard columns were upgraded to the current seismic standards after the repair. However, the stiffness was not restored due to material degradation during the original column tests. Even though the repair process was done rapidly and was treated as "emergency" repair with implication that it was a temporary measure, it can be treated as a permanent repair as long as the stiffness of repaired columns is sufficient for non-seismic loading. In the analytical studies, extensive static and dynamic nonlinear analyses were performed on the column models and a simple analytical method was developed for the repaired columns to account for stiffness degradation. Based on the results from the experimental and analytical studies, repair design recommendations were developed in the third phase to aid bridge engineers in quickly designing the number of layers of CFRP layers based on the apparent damage and basic information about the column fixity, size, and reinforcement.

Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM

Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM
Author: Paulo J. da Sousa Cruz
Publisher: CRC Press
Total Pages: 1126
Release: 2015-03-02
Genre: Technology & Engineering
ISBN: 1498737005

Advances in bridge maintenance, safety, management and life-cycle performance contains the papers presented at IABMAS'06, the Third International Conference of the International Association for Bridge Maintenance and Safety (IABMAS), held in Porto, Portugal from 16 to 19 July, 2006.All major aspects of bridge maintenance, management, safety, and co

Advances in FRP Composites in Civil Engineering

Advances in FRP Composites in Civil Engineering
Author: Lieping Ye
Publisher: Springer Science & Business Media
Total Pages: 956
Release: 2012-02-01
Genre: Technology & Engineering
ISBN: 3642174876

"Advances in FRP Composites in Civil Engineering" contains the papers presented at the 5th International Conference on Fiber Reinforced Polymer (FRP) Composites in Civil Engineering in 2010, which is an official conference of the International Institute for FRP in Construction (IIFC). The book includes 7 keynote papers which are presented by top professors and engineers in the world and 203 papers covering a wide spectrum of topics. These important papers not only demonstrate the recent advances in the application of FRP composites in civil engineering, but also point to future research endeavors in this exciting area. Researchers and professionals in the field of civil engineering will find this book is exceedingly valuable. Prof. Lieping Ye and Dr. Peng Feng both work at the Department of Civil Engineering, Tsinghua University, China. Qingrui Yue is a Professor at China Metallurgical Group Corporation.

Earthquake Resilient Bridge Columns Utilizing Damage Resistant Hybrid Fiber Reinforced Concrete

Earthquake Resilient Bridge Columns Utilizing Damage Resistant Hybrid Fiber Reinforced Concrete
Author: William Dean Trono
Publisher:
Total Pages: 199
Release: 2014
Genre:
ISBN:

Modern reinforced concrete bridges are designed to avoid collapse and to prevent loss of life during earthquakes. To meet these objectives, bridge columns are typically detailed to form ductile plastic hinges when large displacements occur. California seismic design criteria acknowledges that damage such as concrete cover spalling and reinforcing bar yielding may occur in columns during a design-level earthquake. The seismic resilience of bridge columns can be improved through the use of a damage resistant hybrid fiber reinforced concrete (HyFRC). Fibers delay crack propagation and prevent spalling under extreme loading conditions, and the material resists many typical concrete deterioration mechanisms through multi-scale crack control. Little is known about the response of the material when combined with conventional reinforcing bars. Therefore, experimental testing was conducted to evaluate such behaviors. One area of focus was the compression response of HyFRC when confined by steel spirals. A second focus was the tensile response of rebar embedded in HyFRC. Bridge columns built with HyFRC would be expected to experience both of these loading conditions during earthquakes. The third focus of this dissertation was the design, modeling, and testing of an innovative damage resistant HyFRC bridge column. The column was designed to rock about its foundation during earthquakes and to return to its original position thereafter. In addition to HyFRC, it was designed with unbonded post-tensioning, unbonded rebar, and headed rebar which terminated at the rocking plane. Because of these novel details, the column was not expected to incur damage or residual displacements under earthquake demands exceeding the design level for ordinary California bridges. A sequence of scaled, three dimensional ground motion records was applied to the damage resistant column on a shaking table. An equal scale reinforced concrete reference column with conventional design details was subjected to the same motions for direct comparison. Compression tests showed that the ductility of HyFRC is superior to concrete in the post-peak softening branch of the response. HyFRC achieved a stable softening response and had significant residual load capacity even without spiral confinement. Concrete required the highest tested levels of confinement to achieved comparable post-peak ductility. Tension tests showed that HyFRC provides a substantial strength enhancement to rebar well beyond their yield point. Interesting crack localization behavior was observed in HyFRC specimens and appeared to be dependent on the volumetric ratio of rebar. The damage resistant HyFRC bridge column attained its design objectives during experimental testing. It exhibited pronounced reentering behavior with only light damage under earthquake demands 1.5 to 2.0 times the design level. It accumulated only 0.4% residual drift ratio after seven successive ground motions which caused a peak drift ratio of 8.0%. The conventional reinforced concrete column experienced flexural plastic hinging with extensive spalling during the same seven motions. It accumulated 6.8% residual drift ratio after enduring a peak drift ratio of 10.8%.

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations
Author: Hiroshi Yokota
Publisher: CRC Press
Total Pages: 8732
Release: 2021-04-20
Genre: Technology & Engineering
ISBN: 100017381X

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations contains lectures and papers presented at the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), held in Sapporo, Hokkaido, Japan, April 11–15, 2021. This volume consists of a book of extended abstracts and a USB card containing the full papers of 571 contributions presented at IABMAS 2020, including the T.Y. Lin Lecture, 9 Keynote Lectures, and 561 technical papers from 40 countries. The contributions presented at IABMAS 2020 deal with the state of the art as well as emerging concepts and innovative applications related to the main aspects of maintenance, safety, management, life-cycle sustainability and technological innovations of bridges. Major topics include: advanced bridge design, construction and maintenance approaches, safety, reliability and risk evaluation, life-cycle management, life-cycle sustainability, standardization, analytical models, bridge management systems, service life prediction, maintenance and management strategies, structural health monitoring, non-destructive testing and field testing, safety, resilience, robustness and redundancy, durability enhancement, repair and rehabilitation, fatigue and corrosion, extreme loads, and application of information and computer technology and artificial intelligence for bridges, among others. This volume provides both an up-to-date overview of the field of bridge engineering and significant contributions to the process of making more rational decisions on maintenance, safety, management, life-cycle sustainability and technological innovations of bridges for the purpose of enhancing the welfare of society. The Editors hope that these Proceedings will serve as a valuable reference to all concerned with bridge structure and infrastructure systems, including engineers, researchers, academics and students from all areas of bridge engineering.

CONCRETE Innovations in Materials, Design and Structures

CONCRETE Innovations in Materials, Design and Structures
Author: FIB – International Federation for Structural Concrete
Publisher: FIB - Féd. Int. du Béton
Total Pages: 2322
Release: 2019-05-27
Genre: Technology & Engineering
ISBN: 2940643008

This Proceedings contains the papers of the fib Symposium “CONCRETE Innovations in Materials, Design and Structures”, which was held in May 2019 in Kraków, Poland. This annual symposium was co-organised by the Cracow University of Technology. The topics covered include Analysis and Design, Sustainability, Durability, Structures, Materials, and Prefabrication. The fib, Fédération internationale du béton, is a not-for-profit association formed by 45 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction. The fib, was formed in 1998 by the merger of the Euro-International Committee for Concrete (the CEB) and the International Federation for Prestressing (the FIP). These predecessor organizations existed independently since 1953 and 1952, respectively.

Innovative Methodologies for Resilient Buildings and Cities

Innovative Methodologies for Resilient Buildings and Cities
Author: Izuru Takewaki
Publisher: Frontiers Media SA
Total Pages: 135
Release: 2019-09-19
Genre:
ISBN: 2889630722

Resilient buildings and cities are in the center of common interests in modern academic communities for science and engineering related to built environment. Resilience of buildings and cities against multidisciplinary risks, e.g. earthquakes, strong winds, floods, etc., is strongly related to the sustainability of buildings and cities in which reduction of damage during a disaster and fast recovery from the damage are key issues. The reduction of damage is related to the level of resistance of buildings and the time of recovery is affected by the amount of supply of damaged members, assurance of restoration work, etc. Robustness, redundancy, resourcefulness, and rapidity are four key factors for supporting the full realization of design and construction of resilient buildings and cities. This research topic gathers cutting-edge and innovative research from various aspects, e.g. robustness of buildings and cities against earthquake risk, structural control and base-isolation for controlling damage risks, quantification of resilience measures, structural health monitoring, innovative structural engineering techniques for higher safety of buildings, resilience actions and tools at the urban scale, etc.