Use of rubberised backfills for improving the seismic response of integral abutment bridges

Reuse of the 1.5 billion waste tyres that are produced annually is a one of the major worldwide challenges, as waste tyres are toxic and cause pollution to the environment. In recognition of this problem, this paper introduces the reuse of tyres, in the form of derived aggregates in mixtures with granulated soil materials, as previous studies indicated the potential benefits of these materials in the seismic performance of structures. The objective of the present research study is to investigate whether use of rubberised backfills benefits the seismic response of Integral Abutment Bridges (IABs) by enhancing soil-structure interaction (SSI) effects. Numerical models including typical integral abutments on surface foundation with nonlinear conventional backfill material and its alternative form as soil-rubber mixtures are analysed and their response parameters are compared. The research is conducted on the basis of parametric analysis, which aims to evaluate the influence of different rubber-soil mixtures on the dynamic response of the abutment-backfill system under various seismic excitations, accounting for dynamic soil-abutment interaction. The results provide evidence that the use of rubberised backfill leads to reductions in the backfill settlements, the horizontal displacements of the bridge deck, the residual horizontal displacements of the top of the abutment and the pressures acting on the abutment, up to 55, 18, 43 and 47 % respectively, with respect to a conventional backfill comprising of clean sand. Small change in bending moments and shear forces on the abutment wall is also observed. Therefore, rubberised backfills offer promising solution to mitigate the earthquake risk, towards economic design with minimal damage objectives for the resilience of transportation networks.

[1]  A W Beeby,et al.  CONCISE EUROCODE FOR THE DESIGN OF CONCRETE BUILDINGS. BASED ON BSI PUBLICATION DD ENV 1992-1-1: 1992. EUROCODE 2: DESIGN OF CONCRETE STRUCTURES. PART 1: GENERAL RULES AND RULES FOR BUILDINGS , 1993 .

[2]  Tommy Edeskär,et al.  Use of tyre shreds in civil engineering applications : technical and environmental properties , 2006 .

[3]  Alan G. Bloodworth,et al.  Predicting the Earth Pressure on Integral Bridge Abutments , 2012 .

[4]  Kyriazis Pitilakis,et al.  Dynamic Behavior of Sand/Rubber Mixtures, Part II: Effect of Rubber Content on G/G O -γ-DT Curves and Volumetric Threshold Strain , 2012 .

[5]  M. Fardis,et al.  Designer's guide to EN 1998-1 and en 1998-5 Eurocode 8: Design of structures for earthquake resistance; general rules, seismic actions, design rules for buildings, foundations and retaining structures/ M.Fardis[et al.] , 2005 .

[6]  R W James,et al.  Bump At the End of the Bridge , 1997 .

[7]  Edward J Hoppe.  Field Study of Integral Backwall with Elastic Inclusion , 2005 .

[8]  Tommy C. Hopkins,et al.  THE BUMP AT THE END OF THE BRIDGE , 1970 .

[9]  Remarks on site response analysis by using Plaxis dynamic module , 2008 .

[10]  J. Lysmer,et al.  Finite Element Method Accuracy for Wave Propagation Problems , 1973 .

[11]  Hing-Ho Tsang,et al.  Seismic isolation for low‐to‐medium‐rise buildings using granulated rubber–soil mixtures: numerical study , 2012 .

[12]  John S. Horvath.  Lateral Pressure Reduction on Earth-Retaining Structures Using Geofoams: Correcting Some Misunderstandings , 2010 .

[13]  A. Evangelista,et al.  Evaluation of pseudostatic active earth pressure coefficient of cantilever retaining walls , 2010 .

[14]  Kyriazis Pitilakis,et al.  Numerical investigation of the seismic response of RC buildings on soil replaced with rubber–sand mixtures , 2015 .

[15]  Kyriazis Pitilakis,et al.  Small-Strain Shear Modulus and Damping Ratio of Sand-Rubber and Gravel-Rubber Mixtures , 2012, Geotechnical and Geological Engineering.

[16]  Jafar Bolouri Bazaz,et al.  Ratcheting Flow of Granular Materials , 1995 .

[17]  Ahmed Senouci,et al.  Use of Scrap Tires in Road Construction , 1992 .

[18]  Stergios A. Mitoulis,et al.  EVALUATION OF THE STIFFNESS AND DAMPING OF ABUTMENTS TO EXTEND DIRECT DISPLACEMENT-BASED DESIGN TO THE DESIGN OF INTEGRAL BRIDGES , 2015 .

[19]  Anoosh Shamsabadi,et al.  A generalized log-spiral-Rankine limit equilibrium model for seismic earth pressure analysis , 2013 .

[20]  Murat Dicleli,et al.  Comparative assessment of the seismic performance of integral and conventional bridges with respect to the differences at the abutments , 2015, Bulletin of Earthquake Engineering.

[21]  George Gazetas,et al.  Footings under seismic loading: Analysis and design issues with emphasis on bridge foundations , 2006 .

[22]  Dana N. Humphrey,et al.  Properties of Tire Chips for Lightweight Fill , 1992 .

[23]  Kyle M. Rollins,et al.  Nonlinear Soil-Abutment-Bridge Structure Interaction for Seismic Performance-Based Design , 2007 .

[24]  Stergios A. Mitoulis.  Seismic design of bridges with the participation of seat-type abutments , 2012 .

[25]  Stavroula J. Pantazopoulou,et al.  Bridge–embankment interaction under transverse ground excitation , 2007 .

[26]  Dennes T. Bergado,et al.  Strength and deformation characteristics of shredded rubber tire - sand mixtures , 2003 .

[27]  Didier Clouteau,et al.  Equivalent-Linear Dynamic Impedance Functions of Surface Foundations , 2013 .

[28]  Kevin R. Mackie,et al.  Effect of abutment modeling on the seismic response of bridge structures , 2008 .

[29]  Stavroula J. Pantazopoulou,et al.  Assessment and modeling of embankment participation in the seismic response of integral abutment bridges , 2009 .

[30]  Nadarajah Ravichandran,et al.  Applicability of shredded tire chips as a lightweight retaining wall backfill in seismic regions , 2014 .

[31]  Stergios A. Mitoulis,et al.  SEISMIC RESPONSE OF BRIDGE ABUTMENTS ON SURFACE FOUNDATION SUBJECTED TO COLLISION FORCES , 2014 .

[32]  Kyriazis Pitilakis,et al.  Dynamic Behavior of Sand / Rubber Mixtures , Part II : Effect of Rubber Content on G / GO-cDT Curves and Volumetric Threshold Strain , 2011 .

[33]  Amir M. Kaynia,et al.  Development of fragility functions for geotechnical constructions: Application to cantilever retaining walls , 2013 .

[34]  Kyriazis Pitilakis,et al.  Dynamic properties of dry sand/rubber (SRM) and gravel/rubber (GRM) mixtures in a wide range of shearing strain amplitudes , 2012 .

[35]  Frank Naumann,et al.  Fugenlose Betonbrücken mit flexiblen Widerlagern , 2005 .

[36]  J. Douglas,et al.  Internet site for European strong-motion data , 2004 .

[37]  Stergios A. Mitoulis,et al.  Extending the application of integral frame abutment bridges in earthquake‐prone areas by using novel isolators of recycled materials , 2016 .

[38]  Luigi Callisto,et al.  Seismic Design of Flexible Cantilevered Retaining Walls , 2010 .