DOUBLE-TEE
FLEXIBLE CONNECTION
DTFC
(U.S. PATENT NO. US8800232)
A patented solution to failed double tee shear connections in precast parking structures. This post-installed, fatigue-resistant connection addresses joint failures from seismic shear and vehicular loading, preventing corrosion and structural deterioration.
DOUBLE-TEE CONNECTION
DTC Pro
By Northford Structural Connections
(U.S. PATENT NO. US8468766 B1)
The DTC Pro replaces the standard slug or erection bar in precast double tee systems, designed to work with all modern connection embedments. It increases out-of-plane connection strength by 100%, providing superior resistance to cyclical fatigue, shear failures, and flange deterioration in parking structures.
Corrosion Resistant
Technical Information
Download Data Sheets
DTFC Documents
Typical Precast Parking Structure Failures
- Leaking joints and concrete spalls from cyclical traffic stress
- Weld fatigue fractures leading to shear connection weakness
- Flange cracking and delamination due to restrained thermal expansion and contraction
- Progressive load redistribution caused by severed or deteriorated tee-to-tee connections
Our Solutions
The DTFC system reconnects the double tees while still allowing for necessary movement and expansion, restoring the intended behavior and structural integrity of the precast parking structure—all without requiring a garage closure or disrupting operations.
- Top Rated Material
- Fatigue Resistant
FAQ's
Can DTFC Be Used for Retrofit on Existing Precast Parking Structures?
Yes, the DTFC connection was originally developed for the replacement of connections in existing precast parking garages and structures. Its inherent flexibility transverse to the joint allows all connections between shear walls to be abandoned and replaced without fear of overloading the connections during deck contraction in winter months, ensuring safe and efficient rehabilitation of aging parking facilities.
How Long Has the DTFC Double Tee Connection Been in Active Production and Use?
The DTFC connection has successfully been in production and use for over ten years in precast parking garage repair and rehabilitation projects, demonstrating reliable performance against fatigue, seismic loads, and long-term structural demands.
How difficult is installation?
The DTFC connection is installed with simple, common post-installed anchors and techniques, making it straightforward for retrofit applications. The design includes a small erection bolt to hold the connection in place while post-installed anchors are secured, facilitating efficient construction, reducing installation time, and easing worker fatigue in parking structure rehabilitation projects.
Can DTFC Be Used with Any Anchor for Seismic Loading in Precast Structures?
In general, any anchor suitable for seismic loading can be used with the DTFC in precast parking garage applications. However, specific anchors from certain manufacturers provide higher design values, enabling greater seismic shear load capacity and enhanced performance in structural rehabilitation.
Contact Us
- (203) 777-0751
- admin@nscclips.com