A performance-based adaptive methodology for the seismic evaluation of multi-span simply supported deck bridges

A performance-based adaptive methodology for the seismic assessment of highway bridges is proposed. The proposed methodology is based on an Inverse (I), Adaptive (A) application of the Capacity Spectrum Method (CSM), with the capacity curve of the bridge derived through a Displacement-based Adaptive Pushover (DAP) analysis. For this reason, the acronym IACSM is used to identify the proposed methodology. A number of Performance Levels (PLs), for which the seismic vulnerability and seismic risk of the bridge shall be evaluated, are identified. Each PL is associated to a number of Damage States (DSs) of the critical members of the bridge (piers, abutments, joints and bearing devices). The IACSM provides the earthquake intensity level (PGA) corresponding to the attainment of the selected DSs, using over-damped elastic response spectra as demand curves. The seismic vulnerability of the bridge is described by means of fragility curves, derived based on the PGA values associated to each DS. The seismic risk of the bridge is evaluated as convolution integral of the product between the fragility curves and the seismic hazard curve of the bridge site. In this paper, the key aspects and basic assumptions of the proposed methodology are presented first. The IACSM is then applied to nine existing simply supported deck bridges, characterized by different types of piers and bearing devices. Finally, the IACSM predictions are compared with the results of nonlinear response time-history analysis, carried out using a set of seven ground motions scaled to the expected PGA values.

[1]  M. Nuray Aydinoğlu.  An Incremental Response Spectrum Analysis Procedure Based on Inelastic Spectral Displacements for Multi-Mode Seismic Performance Evaluation , 2003 .

[2]  T. Takeda,et al.  Reinforced Concrete response to simulated earthquakes , 1970 .

[3]  Andreas J. Kappos,et al.  Extension of modal pushover analysis to seismic assessment of bridges , 2006 .

[4]  Brian Maroney,et al.  Experimental Testing of Laterally Loaded Large Scale Bridge Abutments , 1993 .

[5]  Frieder Seible,et al.  PIVOT HYSTERESIS MODEL FOR REINFORCED CONCRETE MEMBERS , 1998 .

[6]  R. Clough,et al.  Dynamics Of Structures , 1975 .

[7]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[8]  Amr S. Elnashai,et al.  Advanced inelastic static (pushover) analysis for earthquake applications , 2001 .

[9]  Peter Fajfar,et al.  Capacity spectrum method based on inelastic demand spectra , 1999 .

[10]  Anil K. Chopra,et al.  A modal pushover analysis procedure for estimating seismic demands for buildings , 2002 .

[11]  Rui Pinho,et al.  A comparison of single‐run pushover analysis techniques for seismic assessment of bridges , 2007 .

[12]  Tatjana Isaković,et al.  Bridges: when is single mode seismic analysis adequate? , 2003 .

[13]  Mervyn J. Kowalsky,et al.  Displacement-based seismic design of structures , 2007 .

[14]  M. Dolce,et al.  Frictional Behavior of Steel-PTFE Interfaces for Seismic Isolation , 2005 .

[15]  Triantafyllos Makarios,et al.  Seismic fragility curves for greek bridges: methodology and case studies , 2009 .

[16]  Donatello Cardone,et al.  Evaluation of reduction factors for high-damping design response spectra , 2009 .

[17]  Tatjana Isaković,et al.  Higher modes in simplified inelastic seismic analysis of single column bent viaducts , 2006 .

[18]  Rui Pinho,et al.  An adaptive capacity spectrum method for assessment of bridges subjected to earthquake action , 2007 .

[19]  Andrei M. Reinhorn,et al.  Inelastic analysis techniques in seismic evaluations , 2019, Seismic Design Methodologies for the Next Generation of Codes.

[20]  Shirley J. Dyke,et al.  Response Modification of Bridges , 2003 .

[21]  Andreas J. Kappos,et al.  Further development of a multimodal pushover analysis procedure for seismic assessment of bridges , 2009 .

[22]  Mervyn J. Kowalsky,et al.  A displacement‐based approach for the seismic design of continuous concrete bridges , 2002 .

[23]  Mjn Priestley,et al.  Seismic Design and Retrofit of Bridges , 1996 .

[24]  Rui Pinho,et al.  DEVELOPMENT AND VERIFICATION OF A DISPLACEMENT-BASED ADAPTIVE PUSHOVER PROCEDURE , 2004 .

[25]  Mehdi Saiidi,et al.  SIMPLE NONLINEAR SEISMIC ANALYSIS OF R/C STRUCTURES , 1981 .

[26]  Rui Pinho,et al.  ADVANTAGES AND LIMITATIONS OF ADAPTIVE AND NON-ADAPTIVE FORCE-BASED PUSHOVER PROCEDURES , 2004 .

[27]  Gian Michele Calvi,et al.  Adaptive pushover-based methods for seismic assessment and design of bridge structures , 2005 .

[28]  Tatjana Isaković,et al.  Applicability of pushover methods for the seismic analysis of single‐column bent viaducts , 2008 .

[29]  Reginald DesRoches,et al.  Analytical Seismic Fragility Curves for Typical Bridges in the Central and Southeastern United States , 2007 .

[30]  Mervyn J. Kowalsky,et al.  Displacement-based design of RC bridge columns in seismic regions , 1995 .