Laboratory Tests and Numerical Simulations of CFRP Strengthened RC Pier Subjected to Barge Impact Load

Bridge piers are designed to withstand not only axial loads of superstructures and passing vehicles but also out-of-plane loads such as earthquake excitations and vessel impact loads. Vessel impact on bridge piers can lead to substantial damages or even collapse of bridge structures. An increasing number of vessel collision accidents have been reported in the past decade. A lot of researches have been conducted for predicting barge impact loads and calculating structural responses. However, in practice it is not possible to design bridge structures to resist all levels of barge impact loads. Moreover, with an increasing traffic volume and vessel payload in some waterways, the bridge piers designed according to previous specifications might not be sufficient to resist the current vessel impact loads. Therefore, strengthening existing bridge piers are sometimes necessary for protecting structures from barge impact. Carbon fiber reinforced polymer (CFRP) has been widely used in strengthening reinforced concrete structures under impulsive loadings. It is an effective material which has been proven to be able to increase the flexural strength of structures. In this study, CFRP composites are used to strengthen reinforced concrete piers against barge impact loads. Pendulum impact tests are conducted on scaled pier models. Impact force and pier response with and without CFRP strengthening are compared. The effectiveness of using CFRP strengthening the pier model is observed. In addition, numerical models of the bridge piers are developed and calibrated with experimental results. Parametric simulations of barge impacting on piers with or without CFRP strengthening are carried out. The results show that compared with unstrengthened pier, CFRP composite strengthened bridge pier has a higher impact resistance capacity and hence endures less structural damage under the same barge impact load. The effectiveness of CFRP strengthening with different CFRP thickness, CFRP strength and bond strength between the pier and the CFRP composite are also discussed.

[1]  S. Spangenberg,et al.  Ship impacts: Bow collisions , 1993 .

[2]  Hong Hao,et al.  Laboratory tests and numerical simulations of barge impact on circular reinforced concrete piers , 2013 .

[3]  Claudia Mara Dias Wilson,et al.  Static Finite-Element Analysis of Bridge Fenders for Barge Impact , 2001 .

[4]  Kent A. Harries,et al.  PREDICTIVE RESPONSE OF NOTCHED STEEL BEAMS REPAIRED WITH CFRP STRIPS INCLUDING BOND-SLIP BEHAVIOR , 2012 .

[5]  Azrul A Mutalib,et al.  Development of P-I diagrams for FRP strengthened RC columns , 2011 .

[6]  Farid Taheri,et al.  A numerical study on the axial crushing response of hybrid pultruded and ±45° braided tubes , 2007 .

[7]  L. Malvar.  REVIEW OF STATIC AND DYNAMIC PROPERTIES OF STEEL REINFORCING BARS , 1998 .

[8]  Hong Hao,et al.  Nonlinear Finite Element Analysis of Barge Collision with a Single Bridge Pier , 2012 .

[9]  H. Pond,et al.  THE MOMENT ACTING ON A RANKINE OVOID MOVING UNDER A FREE SURFACE , 1951 .

[10]  René Suter.  Reinforcement of bridge piers with FRP sheets to resist vehicle impact , 2001 .

[11]  A.C.W.M. Vrouwenvelder.  Design for ship impact according to Eurocode 1, Part 2.7 , 1998 .

[12]  Lili Wang,et al.  An impact dynamics analysis on a new crashworthy device against ship-bridge collision , 2008 .

[13]  Nam-Sik Kim,et al.  Equivalent multi-phase similitude law for pseudodynamic test on small scale reinforced concrete models , 2009 .

[14]  M A Knott,et al.  SHIP COLLISION WITH BRIDGES , 1987 .

[15]  Issam E. Harik,et al.  Barge Collision Design of Highway Bridges , 1996 .

[16]  Hong Hao,et al.  Numerical simulation of a cable-stayed bridge response to blast loads, Part II: Damage prediction and FRP strengthening , 2010 .

[17]  Holger Svensson,et al.  Protection of bridge piers against ship collision , 2009 .

[18]  Riadh Al-Mahaidi,et al.  EFFECT OF FATIGUE LOADING ON BOND STRENGTH BETWEEN CFRP SHEETS AND STEEL PLATES , 2010 .

[19]  Ronald A. Cook,et al.  Barge Impact Testing of the St. George Island Causeway Bridge, Phase III: Physical Testing and Data Interpretation , 2006 .

[20]  Claudia Mara Dias Wilson,et al.  PERFORMANCE EVALUATION OF EXISTING BRIDGE FENDERS FOR SHIP IMPACT , 2001 .

[21]  Ronald A. Cook,et al.  BARGE IMPACT TESTING OF THE ST. GEORGE ISLAND CAUSEWAY BRIDGE. PHASE II: DESIGN OF INSTRUMENTATION SYSTEMS , 2003 .

[22]  Armin Patsch,et al.  ANALYSIS AND TESTING OF PILES FOR SHIP IMPACT DEFENSES , 2002 .

[23]  L. Javier Malvar,et al.  Review of Strain Rate Effects for Concrete in Tension , 1998 .

[24]  Kamran Behdinan,et al.  Ballistic limit prediction using a numerical model with progressive damage capability , 2007 .

[25]  P. D. Soden,et al.  Lamina properties, lay-up configurations and loading conditions for a range of fibre-reinforced composite laminates , 1998 .