Extreme Bridge Loads
Full Session with Abstracts
340050-4 - Three-Dimensional Finite Element Modeling and Analysis of UHPC Seismic Bridge columns with High Strength Steel
Friday, April 20
1:30 PM - 5:00 PM
The use of UHPC is currently expanding worldwide from bridge deck joints and connections to full components and larger applications. To improve structural design of UHPC and accurately estimate sections capacities for ultimate design conditions, a better understanding of the damage mechanism of the material is needed. Only few studies investigated the behavior of full UHPC structural elements at failure. This study aims at extending the use of computational methods by investigating the validity of Total Strain Crack model for capturing the behavior of UHPC bridge columns until failure. The objective is to investigate the plastic hinge behavior of UHPC columns and optimize its design using conventional and high strength reinforcing steel under combined vertical and lateral loading. A computational framework that utilizes three-dimensional finite element modeling will be used where solid elements and total crack strain model, as readily implemented in DIANA FEA software, will be used to characterize the UHPC material properties and model different UHPC bridge columns. The total strain crack model allows independent user-defined stress-strain relationships input in tension and compression, while incorporating sustained tensile strength and strain hardening for UHPC. Static nonlinear pushover analysis will be conducted to determine moment and curvature capacities, ductility, and residual displacements and use this knowledge to inform and optimize future seismic bridge design.