Response Sensitivity for Probabilistic Damage Assessment of Coastal Bridges under Surge and Wave Loading

The susceptibility of coastal bridges to damage during hurricane-induced storm surge has been illustrated along the U.S. Gulf Coast in several hurricane events. This factor poses a significant threat to the safety of nationwide transportation systems, effectiveness of postevent emergency response and recovery activities, and socioeconomic stability further afforded by functioning transportation infrastructure. Nationwide risk and loss assessment packages currently lack any reliable input models of bridge fragility to assess the risk to the transportation infrastructure posed by hurricane-induced storm surge and wave. However, these tools are essential for comparing the vulnerability of different bridge types, conducting regional risk assessment or loss estimates, and supporting decision making on risk mitigation activities. As a first step in the development of probabilistic models of bridge vulnerability subjected to hurricane scenarios, sensitivity studies are conducted to assess the significance of varying hazard and bridge parameters on the dynamic response of coastal bridges. Three-dimensional nonlinear finite element models are used to assess these demands under varying input modeling parameters, and an analysis of variance is conducted to evaluate the significance of each parameter. The sensitivity study reveals that the potential variation in wave parameters has the most statistically significant impact on the response of the bridge. Additionally, a second-level sensitivity study reveals that the most critical structural parameter is the deck mass followed by connection modeling parameters. The results of this study provide insight into modeling parameters that should receive careful treatment in probabilistic analysis of bridge vulnerability.

[1]  El Ghamry,et al.  WAVE FORCES ON A DOCK , 1963 .

[2]  J Kulicki,et al.  Development of the AASHTO guide specifications for bridges vulnerable to coastal storms , 2010 .

[3]  K Iradjpanah.  Wave uplift pressure on horizontal platforms , 1984 .

[4]  B. G. Nielson.  Analytical Fragility Curves for Highway Bridges in Moderate Seismic Zones , 2005 .

[5]  Giovanni Cuomo,et al.  Wave-in-deck loads on coastal bridges and the role of air , 2009 .

[6]  Robert G. Bea,et al.  Wave Forces on Decks of Offshore Platforms , 1999 .

[7]  Bo Meng,et al.  Uplift Wave Load on the Superstructure of Coastal Bridges , 2007 .

[8]  D. Max Sheppard,et al.  Storm Surge and Wave Loading on Bridge Superstructures , 2009 .

[9]  Wenrui Huang,et al.  Numerical Modeling of Dynamic Wave Force Acting on Escambia Bay Bridge Deck during Hurricane Ivan , 2009 .

[10]  Haihong Zhao,et al.  Prediction of Storm Surges and Wind Waves on Coastal Highways in Hurricane-Prone Areas , 2007 .

[11]  Ayman M. Okeil,et al.  Survey of Short- and Medium-Span Bridge Damage Induced by Hurricane Katrina , 2008 .

[12]  Reginald DesRoches,et al.  Sensitivity of Seismic Response and Fragility to Parameter Uncertainty , 2007 .

[13]  Gilberto Mosqueda,et al.  Damage to Engineered Buildings and Bridges in the Wake of Hurricane Katrina , 2007 .

[14]  P Kaplan,et al.  THEORETICAL ANALYSIS OF WAVE IMPACT FORCES ON PLATFORM DECK STRUCTURES , 1995 .

[15]  Haihong Zhao,et al.  Hydrodynamic Investigation of Coastal Bridge Collapse during Hurricane Katrina , 2009 .

[16]  J. A. French,et al.  Wave uplift pressures on horizontal platforms , 1969 .

[17]  Reginald DesRoches,et al.  Bridge Damage and Repair Costs from Hurricane Katrina , 2008 .