DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Criteria for generationof the multi-component objective of a reinforced concrete slab with account for the risk analysis

Vestnik MGSU 10/2013
  • Tamrazyan Ashot Georgievich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, full member, Russian Engineering Academy, head of the directorate, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe Shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Filimonova Ekaterina Aleksandrovna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Re- inforced Concrete and Masonry Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 68-74

Generation of objectives should take account of the requirements of cost efficiency, technological effectiveness, reliability and safety. Complex objectives include the production cost of a reinforced concrete slab, operating costs and risks.Possibility of an emergency situation should be taken into account while calculating and constructing elements. The most reasonable way to minimize the damage caused by an emergency situation is to analyze the failure. A risk is defined as a probability of structural failure with implications of a certain level taking place within a certain period of operation. The damage caused by the total or partial destruction of a concrete slab is calculated on the basis of its residual cost, as well as the lowest required expenses for its repair and reconstruction. The «R – S» (risk–damage) function is most closely approximated by an exponential curve. Typically, reduction of the risk value leads to the cost increase of the construction. On the other hand, the risk increase may result in the structural failure in a shorter period of time. The proposed objective function offers the most adequate evaluation of the cost of designed projects considering the probability of emergency situations.

DOI: 10.22227/1997-0935.2013.10.68-74

References
  1. Ehsan N. Risk Management in Construction Industry. Computer Science and Information Technology (ICCSIT), 2010 3rd IEEE International Conference on Computer Science and Information Technology — ICCSIT. 2010, vol. 9, pp. 16—21.
  2. Rekomendatsii po zashchite vysotnykh zdaniy ot progressiruyushchego obrusheniya [Guidelines for the Protection of High-rise Buildings from Progressive Collapse]. Moscow, MNIITEP Publ., 2006.
  3. Minimum Design Loads for Buildings and Other Structures. 2002, ASCE 7—02, American Society of Civil Engineers, Reston, VA.
  4. Li-Chung Chao, Chang-Nan Liou. Risk-minimizing approach to Bid-cutting Limit Determination. Construction Management and Economics. 2007, vol. 25, no. 8, pp. 835—843.
  5. Yu Jie. Application of Risk Analysis Method in Cost Control of Construction Project. Fujian Architecture & Construction. 2004, vol. 3, pp. 12—13.
  6. Ellingwood B.R. Mitigating Risk from Abnormal Loads and Progressive Collapse. Journal of Performance of Constructed Facilities. 2006, vol. 20, no. 4, pp. 315—323.
  7. Tamrazyan A.G. K otsenke riska chrezvychaynykh situatsiy po osnovnym priznakam ego proyavleniya na sooruzhenie [On the Problem of Estimating the Emergency Risk Based on the Main Features Manifested on a Building]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2001, no. 5, pp. 8—10.
  8. Jannadi O.A., Almishari S. Risk Assessment in Construction. Journal of Construction Engineering and Management. 2003, vol. 129, no. 5, pp. 492—500.
  9. Pichugin S.F., Semko A.V., Makhin'ko A.V. K opredeleniyu koeffitsienta nadezhnosti po naznacheniyu s uchetom riskov v stroitel'stve [To the Problem of Reliability Factor in Terms of Designation Test with Account for Risks in Civil Engineering]. Izvestiya vuzov. Stroitel'stvo [News of Higher Educational Institutions. Construction]. 2005, no. 11—12, pp. 104—109
  10. Lychev A.S. Nadezhnost' stroitel'nykh konstruktsiy [Reliability of Engineering Structures]. Moscow, ASV Publ, 2008, 184 p.
  11. Makhutov N.A., Gadenin M.M., Chernyavskiy A.O., Shatov M.M. Analiz riskov otkazov pri funktsionirovanii potentsial'no opasnykh ob"ektov [Analysis of Failure Risks in Case of Operation of Potentially Hazardous Structires]. Problemy analiza riska [The Problems of Risk Analysis]. 2012, vol. 9, no. 3, pp. 8—21.
  12. Dolganov A.I. O nadezhnosti sooruzheniy massovogo stroitel'stva [To the Problem of Reliability of Mass Building Construction]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2010, no. 11, pp. 66—68.

Download

ANALYSIS OF SUFFICIENCY OF THE BEARING CAPACITY OF BUILDING STRUCTURES OF OPERATING SITES OF MAIN BUILDINGS OF THERMAL POWER PLANTS

Vestnik MGSU 3/2012
  • Alekseeva Ekaterina Leonidovna - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 25 - 29

Upon examination of eleven main buildings of power plants, analysis of defects and damages of building structures was performed. Thereafter, the damageability of principal bearing structures of main buildings of thermal plants was analyzed. It was identified that the fastest growing defects and damages were concentrated in the structures of operating sites. The research of the rate of development of the most frequent damages and defects made it possible to conclude that internal corrosion of the reinforcing steel was the most dangerous defect, as far as the reinforced concrete elements of operating sites were concerned. Methods of mathematical statistics were applied to identify the reinforcing steel development pattern inside reinforced concrete elements of floors of operating sites. It was identified that the probability of corrosion of reinforced concrete elements of operating sites was distributed in accordance with the demonstrative law. Based on these data, calculation of strength of reinforced concrete slabs and metal beams was performed in terms of their regular sections, given the natural loads and the realistic condition of structures. As a result, dependence between the bearing capacity reserve ratio and the corrosion development pattern was identified for reinforced concrete slabs and metal beams of operating sites. In order to analyze the sufficiency of the bearing capacity of building structures of operating sites in relation to their time in commission, equations were derived to identify the nature of dependence between the sufficiency of the bearing capacity of reinforced concrete slabs and metal beams of the operating sites and their time in commission.

DOI: 10.22227/1997-0935.2012.3.25 - 29

References
  1. Dobromyslov A.N. Diagnostika povrezhdeniy zdaniy i inzhenernykh sooruzheniy [Damage Diagnostics of Buildings and Engineering Structures]. Moscow, MSUCE, 2008.
  2. Kuznetsov I.P., Ioffe Y.R. Proektirovanie i stroitel’stvo teplovykh elektrostantsiy [Project Design and Construction of Heat Power Plants]. 3rd revised edition, Moscow, Energoatomizdat Publ., 1985.
  3. Kuznecov I.P., Ioffe Ju.R. Rukovodstvo po ekspluatatsii stroitel’nykh konstruktsiy proizvodstvennykh zdaniy promyshlennykh predpriyatiy [Guidelines for Operation of Building Structures of Production Buildings of Industrial Enterprises]. 4th reprint edition, Moscow, 2004.

Download

IDENTIFICATION OF OPTIMAL PARAMETERS OF REINFORCED CONCRETE STRUCTURES WITH ACCOUNT FOR THE PROBABILITY OF FAILURE

Vestnik MGSU 10/2012
  • Filimonova Ekaterina Aleksandrovna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Re- inforced Concrete and Masonry Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 128 - 133

The principal mission of structural design consists in the development of economical though reliable structures. Any safety-related improvements boost the cost of a structure, while any reduction of costs involves higher risks. The objective of any structural designer is to pinpoint the optimal structural parameters among the whole variety of solutions that fall within the range of the pre-set design requirements and minimal risks. Selection of the optimality criteria applicable to reinforced concrete structures is to be based on a set of requirements, including low costs, technological efficiency, safety and observance of limits imposed onto the expenditure of material resources and the workforce.
The author suggests splitting the aforementioned parameters into the two groups, namely, natural parameters and value-related parameters that are introduced to assess the costs of development, transportation, construction and operation of a structure, as well as the costs of its potential failure. The author proposes a new improved methodology for the identification of the above parameters that ensures optimal solutions to non-linear objective functions accompanied by non-linear restrictions that are critical to the design of reinforced concrete structures. Any structural failure may be interpreted as the bounce of a random process associated with the surplus bearing capacity into the negative domain. Monte Carlo numerical methods make it possible to assess these bounces into the unacc eptable domain.

DOI: 10.22227/1997-0935.2012.10.128 - 133

References
  1. Tamrazyan A.G. K otsenke riska chrezvychaynykh situatsiy po osnovnym priznakam ego proyavleniya na sooruzhenie [Concerning the Assessment of the Risk of Emergencies on the Basis of Their Principal Features Demonstrated by the Structure]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2001, no. 5, pp. 8—10.
  2. Pichugin S.F., Semko A.V., Makhin’ko A.V. K opredeleniyu koeffitsienta nadezhnosti po naznacheniyu s uchetom riskov v stroitel’stve [Identification of the Reliability Ratio with Account for Construction-related Risks]. Izv. vuzov. Stroitel’stvo. [News of Higher Education Institutions. Civil Engineering.] 2005, no. 11—12, pp. 105—109.
  3. Huang C., Kroplin B. Optimum Design of Composite Laminated Plates via a Multi-objective Function. International Journal of Mechanical Science. 1995, vol. 37, no. 3, pp. 317—326.
  4. Falso S.A., Afonso S.M.B., Vaz L.E. Analysis and Optimal Design of Plates and Shells under Dynamic Loads – II: Optimization. Structural and Multidisciplinary Optimization, 2004, vol. 27, no. 3, pð.197—209.
  5. Bezdelev V.V., Dmitrieva T.L. Ispol’zovanie mnogometodnoy strategii optimizatsii v proektirovanii stroitel’nykh konstruktsiy [Employment of the Multi-methodological Strategy for the Optimization in the Design of Building Structures]. Izv. vuzov. Stroitel’stvo. [News of Higher Education Institutions. Civil Engineering.] 2010, no. 2, pp. 90—95.
  6. Yarov V.A., Prasolenko E.V. Proektirovanie kruglykh monolitnykh plit perekrytiy ratsional’noy struktury s ispol’zovaniem topologicheskoy i parametricheskoy optimizatsii [Design of Circular In-situ Floor Slabs of Rational Structure through the Employment of Topological and Parametric Optimization]. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel’nogo universiteta [Proceedings of Tomsk State University of Architecture and Civil Engineering]. 2011, no. 3, pp. 89—102.
  7. Tamrazyan A.G., Filimonova E.A. Metod poiska rezerva nesushchey sposobnosti zhelezobetonnykh plit perekrytiy [Methodology of Identification of the Surplus Bearing Capacity of Reinforced Concrete Floor Slabs]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2011, no. 3, pp. 23—25.

Download

Results 1 - 3 of 3