Refined Bridge Deck Design and Analysis

Details

• Creators:
  Wang, Xun ; Ghoroubi, Rahim ; Grayson-Wallace, Brendan ; Cheng, Lijuan
• Corporate Creators:
  University of California, Davis. Department of Civil and Environmental Engineering
• Corporate Contributors:
  California Department of Transportation. Engineering Service Center ; California Department of Transportation. Division of Research, Innovation and System Information
• Subject/TRT Terms:
  Analysis Bridge Decks Bridge Design Design Emergency Vehicles Fatigue Strength Flexural Strength Literature Reviews Rigid Structures Rigid Support Model (RSM) Specifications Travel Demand Management

  More +
• Publication/ Report Number:
  CA25-3668 ; UCD-SESM-25-01
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; California
• Edition:
  Final Report: 11/1/2020 – 10/31/2024
• Corporate Publisher:
  California. Department of Transportation
• Abstract:
  Since the 1960’s, bridge live loads (design axle loads) and truck volume have been continuously increasing. Truck loads and wheel configurations that bridge decks are designed for according to the AASHTO LRFD Bridge Design Specifications no longer reflect the modern trucks, not mentioning the larger permit vehicles (e.g., P-15) and new vehicle configurations mandated or allowed by federal or state programs such as special hauling vehicles (SHV) and emergency vehicles (EV) in the design. The approximate analysis method in the AASHTO LRFD specification that the current bridge deck design procedure is based on lacks sufficient accuracy and is not permitted by the California Amendments to AASHTO for the design of reinforced concrete decks and overhangs. In this research, an updated LRFD-based bridge deck design procedure was developed based on refined analysis methods that consider modern vehicle configurations, dynamic loads, flexural and shear demands. Fatigue-related issues were comprehensively reviewed for reinforced concrete bridge decks in the existing literature with a proposed framework for future study. A large series of finite element analyses of refined reinforced concrete bridge deck models using simplified Rigid Support Model (RSM) concept was conducted under various loading conditions and different girder spacings. The accuracy of the model was satisfactorily validated by a set of detailed 3D bridge models. These comprehensive refined analysis results were then used to develop streamlined charts and an updated deck design table (so called CA-A4, California Amendments to A4) following the same format as the existing AASHTO A4 design table. The updated design values for the negative moment in the CA-A4 cover the negative moment demands generated by the HL-93, SHV, and P-15 vehicles for girder spacings less than 13 ft. Special consideration is recommended for EV3 vehicle load and for the other special vehicle types for girder spacings greater than 13 ft. The proposed bridge deck design procedure is expected to facilitate Caltrans ensuring the safety and adequate load-carrying capacity of reinforced concrete bridge decks to meet the growing traffic demand.
• Format:
  PDF
• Funding:
  65A0774 TO002
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ba7304339a5d46fe263b29cc3ce9756be1faf71e7026e4e0c90749fcc795c0e42db0065c0011782e4b56889303d31688da41d58e321dcaa6fac00a9f1fe411f9
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/90488/dot_90488_DS1.pdf
• File Type:
  [PDF - 14.53 MB ]