Hollow-core FRP-concrete-steel bridge columns under extreme loading.

Details

• Creators:
  Abdelkarim, Omar I. ; Gheni, Ahmed ; Anumolu, Sujith ; Wang, Song ; ElGawady, Mohamed
• Corporate Creators:
  Missouri University of Science and Technology
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Fiber reinforced polymers
  • Highway bridges
  • Steel
  • Columns
  • Reinforced concrete
  • Finite element method
  • Durability
  • Impact loads
• Publication/ Report Number:
  cmr 15-008
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Missouri. Dept. of Transportation. Organizational Results
• Abstract:
  This report presents the behavior of hollow-core fiber reinforced polymer – concrete - steel columns (HC-FCS) under ; combined axial-flexural as well as vehicle collision loads. The HC-FCS column consists of a concrete wall sandwiched between an outer fiber ; reinforced polymer (FRP) tube and an inner steel tube. Four large-scale columns including a conventionally reinforced concrete (RC) column ; having solid cross section and three HC-FCS columns were investigated during this study. Each column had an outer diameter of 24 inch and a ; column’s height-to-diameter ratio of 4.0. The steel tube was embedded into reinforced concrete footing with an embedded length of 1.6 times ; the steel tube diameter. The FRP tube truncated at the top of the footing level; hence, it provides only confinement to the concrete. The hollow ; steel tube was the only reinforcement for shear and flexure inside the HC-FCS column. The HC-FCS column exhibited high lateral drift ; reaching 15.2% and failed gradually due to concrete crushing, steel tube local buckling, followed by FRP rupture. The reference RC-column ; failed at drift of 10.9% due to rebar rupture. Finite element models using LS-DYNA software were developed and validated against the ; experimental results of the investigated large-scale columns and experimental results of small-scale columns available in the literature. The ; proposed model was able to predict the behaviors of the investigated columns with good accuracy. Finite element modeling of vehicle collision ; with RC and HC-FCS bridge columns was also presented in this report. Evaluation of the peak dynamic force (PDF) and the equivalent static ; force (ESF) through an extensive parametric study were conducted. The AASHTO-LRFD design force was found to be non-conservative when ; the column was collided with heavy vehicles of a weight more than 35 kips or high-speed vehicle more than 70 mph. A new equation for ; estimating the ESF based on the vehicle’s mass and velocity was developed. This approach will allow Departments of Transportation (DOTs) to ; design different bridge columns to different impact force demands depending on the anticipated truckloads and velocities. In general, the PDF ; values of the HC-FCS columns were lower than those of the RC column when they were subjected to vehicle collision.
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• Format:
  PDF
• Funding:
  TR201408
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28949/dot_28949_DS1.pdf
• File Type:
  [PDF - 6.48 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:0fb52b5867f71f792575e065b9bc885d1ce532aed4065ebeff464d8e03591b1b913970f04003451cfd2668267f52dd0dbaf056ca855c6570993d233a2037cd23