The use of nonlinear static procedures (NSPs) on the seismic assessment of real existing plan-irregular structures has so far been studied by a limited number of authors. This fact limits the application of such methods to assess current existing structures, the majority of which are irregular in plan. An extended version of the adaptive capacity spectrum method (ACSM) for the seismic assessment of plan-irregular buildings is presented in this paper. The novelty of this proposal is to comprise the most accurate features of commonly used NSPs in order to overcome the problems that subsist in three-dimensional pushover analyses. The accuracy of the procedure is tested in three plan-irregular real buildings. The results are compared with the capacity spectrum method (CSM) with the features proposed in FEMA 440, with the extended N2 method for plan-asymmetric structures, with the adaptive capacity spectrum method (ACSM) and with the most exact nonlinear dynamic analyses. Several seismic intensities are tested, in order to evaluate the performance of the procedure in different stages of structural inelasticity.
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References
1.
AntoniouS., and PinhoR., 2004. Development and verification of a displacement-based adaptive pushover procedure, Journal of Earthquake Engineering8, 643–661.
2.
Applied Technology Council (ATC), 2005. Improvement of Nonlinear Static Seismic Analysis Procedures, FEMA 440 Report, Redwood City, CA.
3.
BalI., CrowleyH., PinhoR., and GulayG., 2008. Detailed assessment of structural characteristics of Turkish RC building stock for loss assessment models, Soil Dynamics and Earthquake Engineering28, 914–932.
4.
BhattC., and BentoR., 2011. Extension of the CSM-FEMA 440 to plan-Asymmetric real building structures, Earthquake Engineering and Structural Dynamics40, 1263–1282.
5.
CasarottiC., and PinhoR., 2007. An adaptive capacity spectrum method for assessment of bridges subjected to earthquake action, Bulletin of Earthquake Engineering5, 377–390.
6.
ChopraA. K., and GoelR. K., 2004. A modal pushover analysis procedure to estimate seismic demands for unsymmetric-plan buildings, Earthquake Engineering and Structural Dynamics33, 903–927.
7.
Comité Européen de Normalisation (CEN), 2004. Eurocode 8: Design of Structures for Earthquake Resistance. Part 1: General Rules, Seismic Actions and Rules for Buildings, EN 1998-1:2004, Brussels, Belgium.
8.
D'AmbrisiA., StefanoM., and TanganelliM., 2009. Use of pushover analysis for predicting seismic response of irregular buildings: A case study, Journal of Earthquake Engineering13, 1089–1100.
9.
ErduranE., and RyanK., 2011. Effects of torsion on the behavior of peripheral steel-braced frame systems, Earthquake Engineering and Structural Dynamics40, 491–507.
10.
FajfarP., MarušicD., and PerusI., 2005a. The extension of the N2 method to asymmetric buildings, in Proceedings of the 4th European Workshop on the Seismic Behaviour of Irregular and Complex Structures, Thessaloniki, Greece.
11.
FajfarP., MarusicD., and PerusI., 2005b. Torsional effects in the pushover-based seismic analysis of buildings, Journal of Earthquake Engineering9, 831–854.
12.
FardisM. N., 2002. Design of an Irregular Building for the SPEAR Project -Description of the 3-Story Structure, Research Report, University of Patras, Greece.
13.
FardisM. N., and NegroP., 2006. SPEAR - Seismic performance assessment and rehabilitation of existing buildings, in Proceedings of the International Workshop on the SPEAR Project, Ispra, Italy.
14.
FilippouF. C., PopovE. P., and BerteroV. V., 1983. Modeling of R/C joints under cyclic excitations, Journal of Structural Engineering109, 2666–2684.
15.
FreemanS. A., 1998. Development and use of capacity spectrum method, Proceedings of the Sixth U.S. National Conf. Earthquake Engineering, Seattle, WA.
16.
GülkanP., and SozenM., 1974. Inelastic response of reinforced concrete structures to earthquakes motions, ACI Journal71, 604–610.
17.
HancockJ., Watson-LampreyJ., AbrahamsonN. A., BommerJ. J., MarkatisA., McCoyE., and MendisR., 2006. An improved method of matching response spectra of recorded earthquake ground motion using wavelets, Journal of Earthquake Engineering10, 67–89.
18.
KreslinM., and FajfarP., 2011. The extended N2 method taking into account higher mode effects in elevation, Earthquake Engineering and Structural Dynamics40, 1571–1589.
19.
LinY. Y., and ChangK. C., 2003. A study on damping reduction factors for buildings under earthquake ground motions, ASCE Journal of Structural Engineering129, 206–214.
20.
ManderJ. B., PriestleyM. J. N., and ParkR., 1988. Theoretical stress-strain model for confined concrete, ASCE Journal of Structural Engineering114, 1804–1826.
21.
Martinez-RuedaJ. E., and ElnashaiA. S., 1997. Confined concrete model under cyclic load, Materials and Structures30, 139–147.
22.
MckennaF., FenvesG. L., FilippouF. C., and MazzoniS., 2009. OpenSees - Open System for Earthquake Engineering Simulation, University of California, Berkeley, available at http://opensees.berkeley.edu/.
23.
MenegottoM., and PintoP. E., 1973. Method of analysis for cyclically loaded RC plane frames including changes in geometry and non-elastic behaviour of elements under combined normal force and bending, in Symposium on the Resistance and Ultimate Deformability of Structures anted on by well defined loads, International Association for Bridges and Structural Engineering, Zurich, Switzerland, 15–22.
24.
Pacific Earthquake Engineering Research Center (PEER), 2009. Strong Ground Motion Database, available at http://peer.berkeley.edu/nga/.
25.
PinhoR., MarquesM., MonteiroR., and CasarottiC., 2008. Using the adaptive capacity spectrum method for seismic assessment of irregular frames, in Proceedings of the 5th European Workshop on the Seismic Behaviour or Irregular and Complex Structures, Catania, Italy.
26.
PinhoR., MonteiroR., CasarottiC., and DelgadoR., 2009. Assessment of continuous span bridges through nonlinear static procedures, Earthquake Spectra25, 143–159.
27.
PriestleyM. J. N., CalviG. M., and KowalskyM. J., 2007. Displacement-based Seismic Design of Structures, IUSS Press, Pavia, Italy.
28.
PriestleyM. J. N., and GrantD. N., 2005. Viscous damping in seismic design and analysis, Journal of Earthquake Engineering9, 229–255.
29.
Seismosoft, 2008. Seismostruct - A computer program for static and dynamic nonlinear analysis of framed structures, available at http://www.seismosoft.com.
30.
VuranE., BalY. E., CrowleyH., and PinhoR., 2008. Determination of equivalent SDOF characteristics of 3-D dual structures, in Proceedings of the 14th World Conference on Earthquake Engineering, Beijing, China, S15–031.
