Impact Of Long Period Ground Motions On Structural Design A Case Study For Bucharest Romania

This book discusses the impact of long-period ground motions on structural design using the situation in Bucharest, the capital city of Romania, as a case study. The first part explores the seismic hazard situation in Bucharest, and the causes of long-period ground motions related to both the source and the site. Subsequently, it examines the current seismic design, detailing building practices in Bucharest, and discusses the impact of long-period ground motions on seismic design. Lastly, several case study buildings in Bucharest are presented and the major difficulties encountered in their design are considered. The book also includes various numerical examples that help readers understand the impact of long-period ground motions on various structural systems, that are currently used in Bucharest. This book is intended for researchers in the field of seismic hazard and risk assessment and designers of multi-story buildings in seismic areas.

This volume contains papers of the 9th European Workshop on the Seismic Behaviour of Irregular and Complex Structures (9EWICS) held in Lisbon, Portugal, in 2020. This workshop, organized at Instituto Superior Técnico, University of Lisbon, continued the successful three-annual series of workshops started back in 1996. Its organization had the sponsorship of Working Group 8 (Seismic Behaviour of Irregular and Complex Structures) of the European Association of Earthquake Engineering.This international event provided a platform for discussion and exchange of ideas and unveiled new insights on the possibilities and challenges of irregular and complex structures under seismic actions. The topics addressed include criteria for regularity, seismic design of irregular structures, seismic assessment of irregular and complex structures, retrofit of irregular and complex structures, and soil-structure interaction for irregular and complex structures. Beyond an excellent number of interesting papers on these topics, this volume includes the papers of the two invited lectures – one devoted to irregularities in RC buildings, including perspectives in current seismic design codes, difficulties in their application and further research needs, and another one dedicated to the challenging and very up to date topic in the area of seismic response of masonry building aggregates in historical centers. This volume includes 26 contributions from authors of 11 countries, giving a complete and international view of the problem.The holds particular interest for all the community involved in the challenging task of seismic design, assessment and/or retrofit of irregular and complex structures.

This volume contains the most relevant peer-reviewed papers presented at The First International Workshop on Vrancea Earthquakes, held in Bucharest on November 1-4, 1997. Strong earthquakes in the Romanian Vrancea area have caused a high toll of casualties and extensive damage over the last several centuries. With a moment magnitude of 7.4, the 1977 earthquake caused more than 1500 casualties, the majority of them in Bucharest. The contributions address key problems of seismotectonics of the Vrancea area and related strong ground motion, hazard assessment, site effects and microzonation, structural damage and earthquake resistant design, risk assessment and disaster management from an international and regional perspective. This list of topics shows the diverse contributions from the multidisciplinary fields of geosciences, geophysics, seismology, geology, civil engineering, city planning, and emergency relief practices. This book is of value for scientists interested in earthquake hazard and seismic risk research as well as for seismologists, geophysicists and Earth scientists. It is also useful for authorities responsible for public safety and natural hazard mitigation plans and for insurance companies.

COST is an intergovernmental framework for European Cooperation in Science and Technology, allowing the coordination of nationally-funded research on a European level. Part of COST was COST Action C26Urban Habitat Constructions Under Catastrophic Events which started in 2006 and held its final conference in Naples, Italy, on 16-18 September 201

These proceedings include most of the available information on this major seismic event and its consequences. With an estimated moment magnitude of 7.7 and a heavy toll in terms of human and economic losses, it ranks as the largest intermediate-depth earthquake in Europe in the twentieth century. Nevertheless, because of the difficult conditions in the 1940s, the lessons learnt after the Vrancea earthquake were not extensively shared with the international scientific community and thus, this book fills a gap in the literature discussing the knowledge acquired after major disasters. Past experience together with current understanding of the 1940 Vrancea earthquake are presented along with the latest information on Romanian seismicity, seismic hazard and risk assessment, and seismic evaluation and rehabilitation of buildings and structures. Moreover, it includes excerpts from Romanian post-disaster reports and textbooks concerning the earthquake.

Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.

This study is dedicated to the preservation of the heritage of the Modern Movement, particularly through improving the structural response to seismic solicitations, which are common in some of the areas where significant works in this style can be found, including Bucharest, Romania. The focus is on developing and validating methodology according to which the vulnerability of "interwar" buildings, which is the other name given to the blocks of flats which witnessing the Modern Movement in the Romanian capital. To complement this study with a geographical generalisation, the models proposed have been also tested for selected earthquakes, taking into account that the Modern Movement left its traces in form of that very characteristic blocks of flats there as well. Residences in form of blocks of flats of the Modern Movement have been built in Bucharest in the 1930s. They present a reinforced concrete frame structure, which infill walls of masonry bricks, although the later could only be limitedly taken into account in this study. However, the method used remains perfectly valid. To determine the impacts of strong ground motion on a certain type of buildings, several approaches have been applied: - the static pushover curve analysis - displacement based dynamic time-history analysis - stress-strain approach based on the dynamic time-history analysis These simulation types have been applied first to simple models, reproducing what in an experimentallaboratory might be tested, then to models of progressivelly more complicated buildings, from regular frame structures, to real building models, which all the irregularities usual in the building practice in that time. The methodology adopted included use of several computer support tools, beginning with software for converting accelerograms, fibre based finite elements, spread shet and database programs. A further step in testing the general validity has been the use of the same methodology for simplified models of real buildings which have been found to be of the same typology as the models studied more extenisivelly. This examination has shown that the methodology proposed is perfectly valid for them. The integration within the general frame of assessment of structural performance has been made comparing the computed damages with real damage types. For this purpose a matrix of damages suffered by "interwar" buildings, previously developed by the author, has been used. It proved again, that the predictions for the buildings with the same geometrical characteristics as those which have been object of this study were close to the reality. The innovative part of this study relies in the stress-strain based approach applied to building models of this size. Such an analysis allows not only description of failure mode and determination of limit states eventually reached by the building, but also the specific determination of the number and, if necessary, position of structural members suffering different types of damage. This kind of output can build the input for other interdisciplinary studies. Of interest for the author is the economic study regarding the retrofit/repair needs of damaged elements as opposed to preventive retrofit. In this sense, an issue for further research, which has been only marginally handled within this work is the retrofit of previously damaged structures, an issue, which perfectly suits into the methodology already proposed and validated.