On the question of setting the level of calculated impact and reliability of high-rise construction

2021 ◽  
pp. 43-56
Author(s):  
Dmitry M. Zhemchugov-Gitman ◽  
Lyubov V. Mozzhukhina ◽  
Alexander M. Uzdin
Keyword(s):  
Seismic Design ◽  
Earthquake Engineering ◽  
Seismic Loads ◽  
Seismic Action ◽  
Seismic Zoning ◽  
Reliability Factor ◽  
High Rise ◽  
Regulatory Documents ◽  
Reduction Coefficient ◽  
Damage Risk

The question of setting the seismic design input on high rise buildings is considered. The existing approaches to accounting for increased responsibility of high rise buildings in Russia are described. The proposal to reduce the probability of an acceptable building failure in proportion to the number of floors and Guideline proposals to increase the reliability factor and using maps of general seismic zoning are analyzed. The main disadvantages of methods described are indicated. It is shown that the current regulatory documents in the field of earthquake engineering do not provide the same reliability of designed structures in general and high-rise buildings in particular. The influence of seismic dangers in according with seismic zoning maps on the reliability of the designed objects is noted. An approach to generating the design input based on the permissible probability of its exceeding is considered using the example of five five-storey buildings and one 25-storey buildings. The probability of the admissible damage value included in the normative calculations is estimated. An estimate of the allowable failure probability on the value of acceptable damage (risk) is proposed under the assumption of a normal distribution of damage caused by earthquake. It is shown that the allowable failure probability decreases with decreasing acceptable damage only in the area of small damages. An approach to the assignment of seismic action based on an assessment of seismic risk has been formulated. The system of design coefficients used to calculate seismic loads on high-rise buildings is analyzed. It is noted that along with an increase in the design level of seismic acceleration, it is necessary to increase the coefficient, taking into account the low damping of high-rise buildings oscillations. At the same time, it is possible to significantly reduce the reduction coefficient by regulating the strains between the building floors.

scholarly journals Analysis of Seismic Resistance of Large-Sized Electrical Equipment by the Method of Computational Analysis

2021 ◽  
Vol 21 (2) ◽  
pp. 17-27
Author(s):  
A. S. Koshmak ◽  
◽  
V. B. Krytskyi ◽  
V. O. Kurov ◽  
Y. O. Oborskyi ◽  
...  
Keyword(s):  
Experimental Method ◽  
Electric Motor ◽  
Computational Analysis ◽  
Electrical Equipment ◽  
Computational Method ◽  
Seismic Resistance ◽  
Seismic Loads ◽  
Seismic Action ◽  
Electric Motors ◽  
Regulatory Documents

In the framework of this article, the problem of confirming the seismic resistance of large-sized electrical equipment is raised using the example of large asynchronous electric motors. The analysis of regulatory documents for the assessment of the seismic resistance of such equipment showed that confirmation of seismic resistance should be performed by an experimental method and other methods can be applied only with sufficient justification of the correct functioning of products. At the same time, rather stringent requirements are established for the test conditions, which in many cases are rather difficult to implement or cannot be met at all. The analysis of the possibility of testing the ASVO 15-23-34M1 electric motor, which is used as fan drives for seismic resistance by an experimental method, under the conditions of specialized organizations accredited in Ukraine, has been carried out. It was found that the existing test installations, due to their characteristics of carrying capacity, cannot be used to carry out tests for seismic resistance of electric motors weighing more than 600 kg. Considering the above, we can conclude that the justification of the seismic resistance of such equipment by experimental methods in Ukraine today is impossible. The analysis of current standards and special normative documents for seismic testing has been carried out. In these documents, clarifications are established on the separation of electrical equipment according to their design features, which make it possible to confirm the seismic resistance of certain groups of equipment by calculation methods. The requirements for the assessment of seismic resistance by the computational method and the evaluation criteria are established. The main purpose of such an assessment is to confirm that the engine retains its structural integrity and performance during and after the passage of seismic action. An assessment of the seismic resistance of the ASVO 15–23–34M1 electric motor was carried out by the method of computational analysis using the method of limiting seismic resistance. A finite element model of an electric motor has been built taking into account all the necessary operational and seismic loads. Strength analysis was carried out using the APM Structure 3D code. Taking into account the results of the performed calculations, it can be concluded that the seismic resistance of the engine during an earthquake with an intensity of up to 8 points according to the DSTU BV.1.1–28:2010 scale is confirmed. The engine withstands seismic loads and remains operational during and after the passage of an earthquake. The minimum value of the ultimate seismic resistance of the engine is determined by the seismic resistance of the stator HCLPF = 0.142 g. Based on the results of the analyses carried out, it can be concluded that the use of the computational method for assessing the seismic resistance of large-sized electrical equipment does not contradict the requirements of the current regulatory documents and can be used as a replacement for the experimental method in cases where tests are impossible or impractical. Modern computer simulation and calculation technologies allow for a comprehensive assessment of the equipment seismic resistance and obtain high reliability results.

scholarly journals Seismic Analysis of RCC and Steel Building on Sloping Ground

2021 ◽  
Vol 9 (VII) ◽  
pp. 1753-1762
Author(s):  
Amruta Kadu
Keyword(s):  
Seismic Design ◽  
High Performance ◽  
Seismic Analysis ◽  
Integrated Design ◽  
Frame Structure ◽  
Seismic Loads ◽  
Building Information Modelling ◽  
Sloping Ground ◽  
High Rise ◽  
Building Information

It is necessary to design and analyse a structure to perform well under seismic loads and also endow with well strength, stability and ductility for seismic design. The seismic performance of high rise steel frame and RCC frame structure is analysed by equivalent static method. The advancement in building, Information, modelling has integrated design, detailing, and fabrication of steel which will result in high performance under earthquake loading. In present work various models were analysed with the help of Staad pro. And the results so obtained were plotted and compared.

scholarly journals Towards Less Disastrous Result from Earthquakes in the Developing Countries

2011 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Eltayeb Hassan Onsa
Keyword(s):  
Developing Countries ◽  
Special Reference ◽  
Natural Disasters ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Adjacent Area ◽  
Seismic Zoning ◽  
The Past ◽  
Human Losses

During the past two decades, natural disasters have claimed millions of human lives and made more than one billion of people homeless or sick[7]. Most of these victims were from developing countries. Earthquakes are one of the natural disasters that strike with little or no warning. Experience with catastrophic earthquakes has shown that demolition and damage of building and structures, which usually have inadequate level safety, cause the human losses and injuries. This paper reviews the earthquake phenomenon. It defines the main parameters of earthquakes and earthquake engineering. The paper recommends a procedure to be followed by some of the developing countries that lies within seismic-prone regions. Special reference is made to the Sudan experience. Sudan has stepped forwards, in the last few years, towards establishment of macro seismic zoning of Sudan and adjacent area and towards the conclusion of suitable seismic design for the Sudan. The paper also recommends updated design provisions which can be adopted for Sudan and other developing countries.

Optimum Seismic Zoning Using An Artificial Neural Network

2016 ◽  
Vol 32 (2) ◽  
pp. 1187-1207 ◽  
Author(s):  
Jaime García-Pérez ◽  
René Riaño
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Seismic Design ◽  
Seismic Zoning ◽  
Present Value ◽  
Total Cost ◽  
Structural Types ◽  
Initial Cost ◽  
Different Types ◽  
Artificial Neural

The Kohonen artificial neural network is employed to divide a region of known seismicity into zones. Optimum boundaries and seismic design coefficients for each zone are determined by computing the expected present value of the total cost, including the initial cost of structures and damages due to earthquakes. The region is discretized into cells containing information on seismicity and the number of structural types. Then regionalization is performed, first without considering jurisdictional limits and later including this restriction. Up to four different types of structures are considered simultaneously in the regionalization. The results are presented in maps showing both zones and corresponding seismic design coefficients.

Analysis on Seismic Performance of Beam and Plate Converter Floor

2014 ◽  
Vol 580-583 ◽  
pp. 1551-1554
Author(s):  
Gen Tian Zhao ◽  
Xu Ting Kou
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Structure Calculation ◽  
High Rise ◽  
High Rise Building ◽  
Design Requirements

With the project case, the seismic performance of girder transfer floor member and the plate transfer floor member were discussed. Contrast calculation was carried out in girder transfer floor member and the plate transfer floor member with SATWE method to analyze its reasonable and unreasonable places. Based on overall structure calculation of a high rise building, the seismic design requirements for buildings applying thick transferring plate have been presented. The conclusion is that the seismic performance of girder transfer floor member is more advantageous and affordable, more convenient and more economical in ingredients.

Automation of seismic design of high-rise structure with braced steel frame

2021 ◽  
Author(s):  
Xin Zhao ◽  
Gang Wang ◽  
Jinlun Cai ◽  
Junchen Guo
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Structural Design ◽  
Structure Design ◽  
Steel Frame ◽  
Design Methods ◽  
Automatic Design ◽  
Component Level ◽  
Design Algorithm ◽  
High Rise

<p>With the continuous development and progress of society, the structure of high-rise buildings has been paid more and more attention by the engineering community. However, the existing high- rise structure design methods often have a lot of redundancy and have a lot of room for optimization. Most of the existing seismic design methods of high-rise structures are based on engineering experience and manual iterative methods, so that the efficiency of design can not meet the needs of the society. if the method of design automation is adopted, the workload of designers can be greatly reduced and the efficiency of structural design can be improved. Based on the digital modeling theory, this paper proposes a MAD automatic design algorithm, in which the designer provides the initial design of the structure, and the algorithm carries out the modeling, analysis, optimization and design of each stage of the structure, and finally obtains the optimal structure. The structural design module of this algorithm starts from the component level, when the component constraint design meets the limit requirements of the specification, it enters and completes the component constraint design and the global constraint design of the structure in turn. In this paper, taking a ten-story braced steel frame high-rise structure as an example, the optimal design is carried out, and its seismic performance is analyzed. the results show that the MAD automatic design algorithm can distribute the materials to each part reasonably, which can significantly improve the seismic performance of the structure and realize the effective seismic design.</p>

scholarly journals Structural Design of Skyscrapers Susceptible to Seismic Activity and Soil Liquefaction

2020 ◽  
Vol 8 (5) ◽  
pp. 2546-2554
Keyword(s):  
Structural Design ◽  
Seismic Activity ◽  
Soil Liquefaction ◽  
Andaman Sea ◽  
Seismic Loads ◽  
Seismic Zone ◽  
Safety Measures ◽  
High Rise ◽  
Ground Condition ◽  
High Chance

The design of skyscrapers involves lot of aspects such as the building must withstand heavy dead loads, should have safety measures against fire, floors must be easily accessible, and should have resistant against wind and seismic loads that can be detrimental to the safety of the skyscraper. Pile foundations are usually adopted for high rise buildings and when it is combined with raft slab they ensure that the problems of differential settlement are taken care of. In this paper the scenario of designing a skyscraper in seismic zone that is prone to earthquakes and the ground condition is such that it is located in vicinity of sea. Andaman and Nicobar isle is one similar place it falls under Zone V as per Indian Standards, hence prone to seismic activity and since it is surrounded by Bay of Bengal and Andaman sea, when seismic activity occurs there is a high chance of soil liquefaction to occur hence proper structural designs should be embraced.

scholarly journals Some limitations of modal analysis in seismic design

1969 ◽  
Vol 2 (3) ◽  
pp. 284-288
Author(s):  
R. Shepherd
Keyword(s):  
Seismic Design ◽  
Response Spectrum ◽  
Individual Member ◽  
Square Root ◽  
High Rise ◽  
Earthquake Resistant Design ◽  
Recent Computer ◽  
Computer Analyses ◽  
Design Loads ◽  
The Individual

In the normal-mode, response-spectrum approach to earthquake resistant design of multistorey buildings the extended elastic seismic design loads are frequently calculated as the square root of the sum of the squares of the modal responses. The individual member forces are then determined using these seismic design loads. Previous research workers have examined the limitations of this technique and it is accepted as being generally applicable in practical design procedures. Recent computer analyses of projected New Zealand high-rise buildings have illustrated two conditions in which the “square root of the sum of the modal responses squared” rule is inapplicable. In this note these situations are described and suggestions are made of an alternative approach which may be adopted when deriving design loads in such cases.

scholarly journals Comparison of the stress-strain state of the reinforced concrete structure under various mathematical models of concrete

2018 ◽  
Vol 251 ◽  
pp. 04032
Author(s):  
Dmitriy Sidorov ◽  
Vladimir Dorozhinskiy
Keyword(s):  
Reinforced Concrete ◽  
Mathematical Models ◽  
Strain State ◽  
Concrete Structures ◽  
Seismic Action ◽  
Reinforced Concrete Structure ◽  
Reinforcing Bars ◽  
Plastic Deformations ◽  
Regulatory Documents ◽  
Structural Engineer

Nowadays, reinforced concrete structures are most often used as load-bearing elements of buildings and structures. In the case of alternating loads such as seismic action, there is accumulation of residual plastic deformations in the concrete structures, which leads to a significant complication in the calculation of structures by “standard” methods. For such problems, it is advisable to use computational complexes in which mathematical models of structural materials are implemented, which allow to describe the work of concrete and reinforcing bars for various types of impacts more properly. However, when applying such methods, the results obtained should not contradict the requirements of the existing regulatory documents, which, in the first place, the structural engineer should be guided by. Before solving more complex problems, the applied methods should be verified and analyzed for fairly simple structures and types of loads.

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