- The Marcus H. Ansley Structures Research Center, located at Innovation Park in Tallahassee, Florida is a structural research and testing facility for the Florida Department of Transportation. The primary mission of the Structures Research
Center is to provide research, testing, and evaluation of innovative structural components and bridge systems along with testing existing inventory to provide for safe, reliable, and cost efficient structures across the State's
- Our vision is to provide the Department the highest quality technical expertise in the field of structural research and structural testing.
- Shear Behavior of Webs Post-Tensioned with Tendons Containing Flexible Fillers
Posted: July 6th, 2021
FDOT has moved from cementitious grouted post-tensioning tendons to a flexible filler, which will affect the shear strength of sections with webs containing such tendons. Little data are available on the shear strength of webs containing
PT tendon with ungrouted ducts. The objective of this project is to investigate the serviceability and shear strength of I-girder webs containing draped post-tensioning ducts. Destructive testing was done in two phases with phase
1 being done on modified AASHTO Type III specimens and phase 2 using FIB-54 specimens. Phase 2 test results along with phase 1 results will be analyzed and compared to the existing web reduction requirements in the LRFD. Based on the
results recommendations will be made for webs of girders containing empty ducts in the context of the current LRFD requirements for shear design.
- Florida Slab Beam Bridge with Ultra-High Performance Concrete Joint Connections
Posted: June 25th, 2021
The main objectives of this project are to develop a resilient short-span, slab-beam bridge solution with an optimized joint region design for UHPC connection between members, assess the strength and durability of UHPC-to-precast bond
with joint surface treatment using exposed aggregates, evaluate the feasibility of simply for dead continuous for live load (SDCL) concepts, and recommend fabrication procedures, on-site construction practices and erection tolerances
to account for sweep and differential camber. Currently, two sets of fatigue and strength tests evaluated the developed joint geometry under a large-scale, two-beam configuration scenario. The last ongoing test will evaluate locked-in
stresses when a surcharge is implemented to level differential camber in a four-beam configuration scenario also under fatigue and strength tests.
- Fiber-Reinforced Concrete (FRC) Railing Project
Posted: November 30th, 2020
The main objective of this study is to investigate fiber-reinforced concrete (FRC) as a possible means of eliminating the need for installation of a rebar cage (consisting of flexural and shear steel reinforcing bars) in the FDOT 36-in.
single-slope traffic railing. Instead of traditional rebar-reinforcement, the improved mechanical properties of FRC are relied upon as a primary form of reinforcement within the concrete traffic railing. Pendulum impact testing has
been used to investigate the structural adequacy of an FRC bridge railing, relative to a traditional rebar-reinforced concrete railing. The videos above were captured with a high-speed camera during a full-scale pendulum impact test
on an FRC traffic railing, where minimal levels of deflection and damage were observed.
- Tapered Bearing Pad Project
Posted: July 13th, 2020
The objective of this project is to evaluate aspects of tapered elastomeric bridge bearing pad design, production, and behavior in order that appropriate departmental policy regarding the use of such pads can be established. In
order to evaluate design properties, flat and tapered bearing pads with various slopes are tested using a special-purpose test setup to study the effect of taper on axial and shear stiffness properties. The effect of taper
on slip behavior of pads is also being studied. Based on the data obtained from the physical testing, recommendations for bridge design using tapered pads will be provided.
- Stainless Steel Strands and Lightweight For Pretension Concrete Girder
Posted: October 8th, 2019
Duplex high-strength stainless steel (HSSS) strands Grade 2205 are a viable alternative material in prestressed concrete members in harsh environments due to their high corrosion resistance. The objectives of this research are
to provide insight into the design and fabrication of girders with 0.6-in. duplex high-strength stainless steel strands, to study the flexural behavior of girders prestressed with stainless steel strands and compare experimental
results with those of control girders
- Fiber-Reinforced Concrete for Bridge Impact Railing: Small-Scale Testing
Posted: February 26, 2019
The objective of this project is to develop an FRC mix that can be utilized in slip form construction of bridge rails, and provide enough resistance and durability to warrant the exclusion of longitudinal rebar in the bridge rail
design. In order to evaluate impact resistance, physical tests should be dynamic in nature. This first set of impact tests on small-scale slab specimens is intended to evaluate the developed mix for mechanical properties such
as strength, toughness, fragmentation, fiber pullout or rupture, etc. If the results are favorable, full-scale testing of standard FDOT bridge rail geometry will ensue..
- Large Bars Spliced in UHPC Project
Posted: February 19, 2019
Ultra-high performance concrete (UHPC) has a high early strength, requires less development or splice length than conventional concrete and has been previously used in the superstructures of many accelerated construction
projects. UHPC also has a discontinuous pore structure that reduces liquid ingress, significantly enhancing durability compared to conventional concrete. Although UHPC has been researched extensively, previous research for
reinforcing bar splice and development lengths has focused on #9 and smaller diameter bars and has not addressed the larger diameter bars used for substructures. This research project addresses single bar splice capacity
for a range of variables, including bar size, splice length and construction tolerances. The bar sizes considered are #8 through #11 bars, which are typical for substructure construction.