Assessment Of Seismic Resistance Of Existing Preschool Educational Institutions And Recommendations For Their Provision Seismic Safety

2020 ◽  
Vol 02 (12) ◽  
pp. 90-99
Author(s):  
Khamidulla Sadullaevich Sagdiev ◽  
◽  
Anvar Sayfullayevich Yuvmitov ◽  
Botirjon Baxrom O'g'li Uktamov ◽  
G`Iyosjon Mirzajonovich Qodirov ◽  
...  

The article presents the results of calculations of buildings for seismic effects, selected preschool educational institutions in Fergana, as well as some recommendations for their further safe operation.

2013 ◽  
Vol 671-674 ◽  
pp. 1376-1379
Author(s):  
Ji Hua Chen ◽  
Ya Hui Yang ◽  
Wei Wang

Along with the rapid development of city, the research on seismic effect of the sites is gradually recognized. In this paper earthquake effects of several engineering sites selected from Shijiazhuang are studied, using the one-dimensional linear program and considering different seismic wave and peak acceleration. Through analyzing the characteristics of the seismic effects certain rule are summarized, and it can be taken as a reference for site seismic effects and seismic safety evaluation of this local area.


2017 ◽  
pp. 9-13
Author(s):  
D. Ryzhov ◽  
O-i. Shugaio ◽  
O-r. Shugaylo ◽  
O. Kendzera ◽  
M. Marienkov ◽  
...  

According to Articles 22 and 24 of the Law of Ukraine “On Nuclear Energy Use and Radiation Safety” and with the aim of improving the regulatory and legal documents regulating nuclear and radiation safety of nuclear installations, the regulation “Requirements for Seismic Resistance Design and Evaluation of Seismic Safety of Ukrainian NPPs: NP 306.2.208-2016” was developed. The paper presents modern requirements included into NP 306.2.208-2016. The emphasis was done on new requirements that were not previously available in PNAE G-006-87, but should be taken into account both in the design of new NPP units and in the assessment/reassessment of seismic resistance of operating units.


Author(s):  
Ф.Ф. Аптикаев

Задание сейсмических воздействий в отечественных строительных нормах практически не меняется в течение последних 60 лет. Накопленные эмпирические данные по сильным движениям позволяют коренным образом усовершенствовать методику расчета зданий и сооружений на сейсмостойкость. Ожидается снижение погрешностей расчета примерно вдвое. Цель работы. В последнее время много внимания уделяется проблемам построения карт сейсмической опасности в ускорениях. Однако по традиции в нашей стране такие карты оценивают сейсмическую опасность в баллах шкалы сейсмической интенсивности. В большинстве стран сейсмическая опасность оценивается именно в ускорениях. Строились такие карты и в нашей стране. В частности, карты ОСР-97 и ОСР-2012 имели вариант и в ускорениях. Построение карт сейсмической опасности в ускорениях не имеет принципиальных трудностей. Проблема в том, что ускорения не являются адекватной мерой сейсмических воздействий. Более половины века тому назад американские ученые на эмпирическом материале показали, что связь ускорений с баллами, а, следовательно, и с повреждаемостью зданий неоднозначна: шкалы сейсмической интенсивности различны для разных расстояний и грунтов. Ошибка в оценке последствий землетрясения по ускорениям грунта может достигать 2 баллов. Следовательно, расчет ожидаемых воздействий следует производить с учетом других характеристик сейсмических волн. К тому же, попытки построения карт сейсмической опасности строились без учета данных инженерной сейсмологии и с нарушениями правил теории вероятностей и поэтому обладают не только определенными достоинствами, но и серьезными недостатками. Некоторые исследователи считают, что скорости колебаний лучше коррелируются с повреждениями сооружений, по крайней мере, многоэтажных зданий и подземных трубопроводов. Методы работы. Однако анализ эмпирических данных показал, что использование ускорений, скоростей и смещений характеризуется примерно одинаковой точностью. Рассмотрены способы построения карт общего сейсмического районирования. В действующей шкале сейсмической интенсивности ГОСТ Р 57546.2017 приведены оценки корреляции повреждаемости зданий с различными параметрами сейсмических колебаний: ускорениями, скоростями, смещениями, мощностью колебаний грунта. Оценено влияние продолжительности колебаний. Результаты работы. Показано, что дальнейшее повышение надежности расчетов объектов на сейсмостойкость связана с представлением сейсмических воздействий не с амплитудами колебаний, а с энергетическими характеристиками сейсмических волн The specification of seismic effects in domestic building codes has remained practically unchanged over the past 60 years. The accumulated empirical data on strong ground notions make it possible to radically improve the methodology for calculating buildings and other structures for seismic resistance. It is expected that the calculation errors will be reduced by about half. Aim. Recently, much attention has been paid to the problems of developing seismic hazard maps in accelerations. However, by tradition in our country, such maps assess the seismic hazard in terms of the seismic intensity scale. In most countries, seismic hazard is assessed in terms of accelerations. Such maps were also built in our country. In particular, OSR-97 maps also had a variant in acceleration. The construction of seismic hazard maps in accelerations has no fundamental difficulties. The problem is that accelerations are not an adequate measure of seismic effects. More than half a century ago, American scientists, using empirical material, showed that the relationship between accelerations and points, and, consequently, with the damage to buildings, is ambiguous: the seismic intensity scales are different for different distances and grounds. The error in assessing the consequences of an earthquake in terms of ground acceleration can reach 2 points. Therefore, the calculation of the expected impacts should be based on other characteristics of the seismic waves. In addition, attempts to construct seismic hazard maps were built without taking into account the data of engineering seismology and with violations of the rules of probability theory and therefore have not only certain advantages, but also serious drawbacks. Some researchers believe that vibration velocities correlate better with structural damage, at least in multi-storey buildings and underground pipelines. However, the analysis of empirical data showed that the use of accelerations, velocities and displacements is characterized by approximately the same accuracy. Methods. Methods for constructing maps of general seismic zoning, which have a higher accuracy in comparison with existing maps, are considered. In the current scale of seismic intensity GOST R 57546.2017 estimates of the correlation of damage to buildings with various parameters of seismic vibrations are given: accelerations, velocities, displacements, power of ground vibrations. The influence of the duration of the oscillations is estimated. Results. It is shown that a further increase in the reliability of calculations of objects for seismic resistance is associated with the representation of seismic effects not with vibration amplitudes, but with the energy characteristics of seismic waves


Author(s):  
S. Kh. Dostanovа ◽  
◽  
G. T. Kasymova ◽  
K.E. Tokpanova ◽  
Saleh Ghulam Sah ◽  
...  

The article discusses the main directions of the development of the theory of seismic resistance of buildings and structures. Various models of the «building-foundation-foundation» system are presented. Much attention is paid to the influence of the foundation on seismic effects and the wave process of earthquakes.


Author(s):  
Ján Baulovič ◽  
Blažej Pandula ◽  
Julián Kondela ◽  
Marta Prekopová

Recently, negative effects of the blasting operations and quantification of the seismic safety are regarded as very important technical problem in quarries. The impact of blasting operations is accompanied by both positive and negative seismic effects. For example, vibrations generated by explosion create very positive effect − when help to break the rocks, but, on the other hand, also result in negative effect − when affect constructions and natural environment in the vicinity of a blasting works site. If the vibrations are large enough, then the nearby objects could be damaged or destroyed. This article highlights the results of the blasting operation monitoring in limestone Lopušné Pažite quarry on Slovakia, which based on the rule that the negative effects depend on their range and strength. This method is applied in all quarries in Slovakia, which are close to settlements.


2011 ◽  
Vol 243-249 ◽  
pp. 4056-4060
Author(s):  
Gao Hang Cui ◽  
Xiao Li Zhu ◽  
Xia Xin Tao

For the past few years, Push-over analytical method was regarded as a new evaluation method for seismic resistance capacity of structure in some advanced countries. More available information can be obtained from Push-over analysis than from elastic static, even elastic dynamic analysis and the method is easy to be operated. The elastic spectrum from the Highway Engineering Seismic Design Code (JTJ 004-89) was improved in order to take the inelastic effect into account. The inelastic demand spectra were derived by means of Vidic's strength reduction factors. By comparing capacity curves of bridge structure with the demand elastic spectrum, the earthquake resistance of bridge structure can be estimated. Furthermore, it is applied to evaluate seismic resistance capacity of a real bridge example in this paper. The results show that Pushover method can replace inelastic dynamic history analysis method in some cases.


Author(s):  
Nikolay Nikitovich Panasenko ◽  
Alexey Vladimirovich Sinelshchikov ◽  
Pavel Victorovich Yakovlev

The choice of methods of the theory of seismic resistance in relation to the assessment of seismic safety of hoisting cranes operated in buildings and structures depends on the availability and the type of a seismic model. In the presence of a seismic input in the form of seismic coefficients of dynamism or their modified variants in the form of seismic response spectra, there is used a linear-spectral method, to be exact, its "flat" version, according to BD 14.13330.2014 "Building in seismic zones" and DS-031-01 "Design standard of earthquake resistant atomic power stations". Dynamic analysis of the theory of seismic resistance of structures is an extension of a linear-spectral method. It simplifies finite-element modelling of real structures, but uses methods of numerical integration of big systems of second-order seismic differential equations.


Vestnik MGSU ◽  
2020 ◽  
pp. 569-584
Author(s):  
Yury P. Lyapichev

Introduction. Over the last 10–20 years many rockfill dams with reinforced concrete faces that are 140–200 m high (Mohale in Lesotho, Tian Sheng Yao, Zipingpu in China, etc.) have experienced serious problems, including face slab cracking and perimeter joint opening. Most of these dams were built in high seismic hazard areas, and their seismic resistance to the maximal earthquake exposure, having the magnitude equal to 8–9, raises doubts. The goal of this research is to employ numerical methods to verify the seismic resistance of dams, to project their behavior in case of the seismic exposure that may damage the dam face, cause the face joints to open and the dam face to detach from its toe, etc. Materials and methods. The author offers his analysis of reliability and applicability of numerical methods to the seismic resistance of dams. Incidents have demonstrated the need for a thorough assessment and analysis of each aspect of a new project whenever it is extrapolated from the precedent. Results. The analysis of the dam behavior in the course of the first reservoir filling has demonstrated face top cracking that causes its damage. Deeper in the water, face joints may be exposed to localized damages due to compression and shear; one should expect vertical face joints to open; excessive compressibility of the downstream rockfill zone may cause the water to leak through the dam face. The author offers recommendations for the performance of the dynamic analysis of dams in respect of the boundaries of the computational domain, given that seismic waves are transmitted or absorbed at the interface between the dam face and the transition zone, on the one hand, and between dam slabs, on the other hand. In furtherance of his recommendations, real and synthetic accelerograms are applied to the bottom boundary of the computational domain; the choice of an explicit or implicit computational method should be made; the author’s method pre-sets the intermediate solution which is to comply with the accelerogram digitization pattern. Conclusions. In addition to internationally established measures for improving the static and seismic safety of dams, the author proposes a new effective dam safety improvement method to be used in the course of designing high dams to be con-structed in high seismic hazard areas. This method improves dam safety by drastically reducing face deflections with the help of a support zone made of roller compacted concrete instead of the gravel transition zone, as exemplified by the 275 m high Kambaratinskaya-1 dam in Kyrgyzstan and the 192 m high Sogamoso dam in Colombia (both dams are located in highly seismic regions). The information on China's successful track record in designing and building similar dams, which are 220–250 m high, is also provided.


2020 ◽  
pp. 13-19
Author(s):  
R. Buryak ◽  
D. Ryzhov ◽  
O. Horodnichenko ◽  
O-r Shugaylo ◽  
O-i Shugailo ◽  
...  

Since November 2016, the new Regulatory Guideline NP 306.2.208-2016 “Requirements for Seismic Resistance Design and for Evaluation of Seismic Safety of Ukrainian NPPs” [1] has been in force in Ukraine. This Guideline was developed to improve requirements for NPP site seismic hazard assessment, NPP seismic resistance design and assessment/review of Ukrainian NPP seismic safety. Energoatom developed the Organizational and Technical Measures for Implementation of NP 306.2.208-2016 [2] approved by State Nuclear Regulatory Inspectorate of Ukraine to perform NP 306.2.208-2016 [1] requirements. The paper considers the status of Energoatom in implementation of the main organizational and technical measures [2] on increasing seismic resistance of Ukrainian NPP units according to NP 306.2.208-2016 [1]. In particular, these measures are the following: specification of NPP site seismicity considering results of new studies; introduction of changes into classification (seismic categorization) of systems and components; analysis of necessity to consider additional load combinations with seismic loads, specification of assessing seismic resistance of structures, systems and components; seismic probabilistic safety assessment of NPP units.


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