Effects of near-fault vertical earthquakes on the nonlinear incremental response of r.c. base-isolated structures exposed to fire

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• 作者：Fabio Mazza
• 关键词：R.c. base ; isolated framed structures ; Fire scenarios ; Thermal mappings ; Near ; fault ground motions ; Incremental dynamic analysis
• 刊名：Bulletin of Earthquake Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：14
• 期：2
• 页码：433-454
• 全文大小：4,023 KB
• 参考文献：Anderberg Y (2009). Assessment of fire-damaged concrete structures and the corresponding measures.In: Concrete repair, rehabilitation and retrofitting II—Proceedings of the 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR,1:631–636
  Baratta A, Corbi I (2004) Optimal design of base-isolators in multi-storey buildings. Comput Struct 82(23–26):2199–2209CrossRef
  Behnam B, Ronagh H (2013) Performance of reinforced concrete structures subjected to fire following earthquake. Eur J Environ Civil Eng 17(4):270–292CrossRef
  Elgamal A, He L (2004) Vertical earthquake ground motion records: an overview. J Earthquake Eng 8(5):663–697
  Eurocode 1 (2004). Actions on structures—part 1–2: general actions, actions on structures exposed to fire. C.E.N., European Committee for Standardization
  Eurocode 2 (2004). Design of concrete structures—part 1–2: general rules, structural fire design. C.E.N., European Committee for Standardization
  Eurocode 8 (2004). Design of structures for earthquake resistance—part 3: assessment and retrofitting of buildings. C.E.N, European Committee for Standardization
  Foti D (2014) Response of frames seismically protected with passive systems in near-field areas. Int J Struct Eng 5(4):326–345CrossRef
  IBC (2009). International building code. International Code Council
  ISO 834 (1999). International standard, fire resistance tests, ISO 834-1 test conditions. Provided by IHS under license with ISO: 31, Genève, Switzerland
  Kodur VKR (2014). Properties of concrete at elevated temperatures. ISRN Civil Engineering Article number 468510, p 15
  Kodur VKR, Raut NK, Mao XY, Khaliq W (2013) Simplified approach for evaluating residual strength of fire-exposed reinforced concrete columns. Mater Struct 46:2059–2075CrossRef
  Mazza F (2014) A distributed plasticity model to simulate the biaxial behaviour in the nonlinear analysis of spatial framed. Comput Struct 135:141–154CrossRef
  Mazza F (2015) Nonlinear incremental analysis of fire-damaged r.c. base-isolated structures subjected to near-fault ground motions. Soil Dyn Earthquake Eng 77:192–202CrossRef
  Mazza F, De Luca A (2015). Seismic vulnerability in case of fire of existing r.c. framed buildings: modelling and nonlinear dynamic analysis. In: COMPDYN 2015, 5th ECCOMAS Thematic conference on computational methods in structural dynamics and earthquake engineering, Crete Island, Greece, 25–27 May 2015, p 491
  Mazza F, Fiore M (2015). Comparative study of the wind and earthquake dynamic responses of fire exposed steel framed buildings. In: COMPDYN 2015, 5th ECCOMAS thematic conference on computational methods in structural dynamics and earthquake engineering, Crete Island, Greece, 25–27 May 2015, p 490
  Mazza F, Mazza M (2010) Nonlinear analysis of spatial framed structures by a lumped plasticity model based on the Haar-Kàrmàn principle. Comput Mech 45:647–664CrossRef
  Mazza F, Mazza M (2012) Nonlinear modeling and analysis of R.C. framed buildings located in a near-fault area. Open Constr Build Technol J 6:346–354CrossRef
  Mazza F, Vulcano A (2009) Nonlinear response of r.c. framed buildings with isolation and supplemental damping at the base subjected to near-fault earthquakes. J Earthquake Eng 13(5):690–715CrossRef
  Mazza F, Vulcano A (2010) Nonlinear dynamic response of r.c. framed structures subjected to near-fault ground motions. Bull Earthq Eng 8:1331–1350CrossRef
  Mazza F, Vulcano A (2012) Effects of the near-fault ground motions on the nonlinear dynamic response of base-isolated r.c. framed buildings. Earthquake Eng Struct Dyn 41:211–232CrossRef
  Mostafaei H (2013a) Hybrid fire testing for assessing performance of structures in fire - Methodology. Fire Saf J 58:170–179CrossRef
  Mostafaei H (2013b) Hybrid fire testing for assessing performance of structures in fire—application. Fire Saf J 56(30–38):2013
  Mostafaei H, Kabeyasawa T (2010). Performance of a six-story reinforced concrete structure in post-earthquake fire. In: Institute for Research in Construction, 10th Canadian Conference on Earthquake Engineering, Toronto, Canada, 25–29 July, 1:481-490
  Mostafaei H, Vecchio F, Bénichou N (2009). Seismic resistance of fire-damaged reinforced concrete columns. In: ATC and SEI conference on improving the seismic performance of existing buildings and other structures, San Francisco, California, United States, 9–11 December, 1:1396–1407
  Oliveto G, Marletta M (2005) Seismic retrofitting of reinforced concrete buildings using traditional and innovative techniques. ISET J Earthquake Technol 42:21–46
  Pacific Earthquake Engineering Research Center database (2008) peer.berkeley.edu/smcat/search.html
  Papazoglou AJ, Elnashai AS (1996) Analytical and field evidence of the damaging effect of vertical earthquake ground motion. Earthquake Eng Struct Dyn 25:1109–1137CrossRef
  PRO_VLIM (2007). Analytical verification of the fire resistance of any shape reinforced and prestressed concrete sections. PROSAP, Ferrara, Italy. http://​www.​2si.​it
  Rigberth J (2000). Simplified design of fire exposed concrete beams and columns. Department of Fire Safety Engineering, Lund University, Sweden, Report No. 5063
  Sorace S, Terenzi G (2008) Analysis and demonstrative application of a base isolation/supplemental damping technology. Earthquake Spectra 24(3):775–793CrossRef
  Sorace S, Terenzi G (2014a) Analysis, design, and construction of a base-isolated multiple building structure. Adv Civil Eng 585429:1–13CrossRef
  Sorace S, Terenzi G (2014b) Motion control-based seismic retrofit solutions of R/C school building designed with earlier Technical Standards. Bull Earthq Eng 12(6):2723–2744CrossRef
  NTC08, Technical Regulations for the Constructions (2008). Italian Ministry of the Infrastructures
  Venanzi I, Materazzi AL, Zappia M (2009). Residual strength of R.C. buildings after a fire: A case study. In: concrete repair, rehabilitation and retrofitting II—Proceedings of the 2nd international conference on concrete repair, rehabilitation and retrofitting, ICCRRR 1:623–629
  
• 作者单位：Fabio Mazza (1)
  
  1. Dipartimento di Ingegneria Civile, Università della Calabria, 87036, Rende, Cosenza, Italy
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Civil Engineering
  Geophysics and Geodesy
  Hydrogeology
  Structural Geology
  
• 出版者：Springer Netherlands
• ISSN：1573-1456

文摘

High values of the ratio between the peak of the vertical and horizontal ground accelerations of near-fault ground motions can become critical once the strength level of a fire-weakened base-isolated structure is reduced especially as the ductility demand can increase much more rapidly for an ever-lower strength level. In the present work, the incremental dynamic analysis (IDA) of base-isolated structures exposed to fire is carried out considering the horizontal and vertical components of seven near-fault ground motions with different values of the peak acceleration ratio. To this end, six five-storey reinforced concrete office buildings, base-isolated with high-damping-laminated-rubber bearings (HDLRBs), are designed assuming different values of the ratio between the vertical and horizontal stiffnesses of the HDLRBs. The design of the test structures is carried out in a high-risk region considering (besides the gravity loads) the horizontal seismic loads acting in combination with the vertical ones. Five fire scenarios are considered at 45 (i.e. R45) and 60 (i.e. R60) min of resistance, with the parametric temperature–time fire curve evaluated in accordance with Eurocode 1: i.e. fire compartment at the fifth level (F5), the upper two (F4/5) and the other (Fi, i = 1–3) levels. The nonlinear IDA analysis is carried out in a step-by-step procedure, which is based on a two-parameter implicit integration scheme and an initial-stress-like iterative procedure. At each step of the analysis, plastic conditions are checked at the potential critical sections of the beams (i.e. end sections of the sub-elements in which a beam is discretized) and columns (i.e. end sections), where a bilinear moment–curvature law is adopted; the effect of the axial load on the ultimate bending moment (M–N interaction) of the columns is also taken into account. Finally, reduced strength and ultimate ductility of the cross-sections are evaluated in line with the 500 °C isotherm method proposed by Eurocode 2.