Update
Please note, the order volume has been updated. This is due to package and minimum order quantities.
Please note, the order volume has been updated to. This is due to package and minimum order quantities.
Rebar Design Center
Hilti products and solutions to help solve the toughest post-installed rebar challenges
Designing post-installed rebar using the development and splice provisions of ACI 318 Chapter 12 and Chapter 21 is not the same as designing post-installed rebar using the anchoring provisions of ACI 318 Appendix D.
Since the bar is being installed at deeper embedment and being used to develop lengths for seismic design, shear dowels and starter bars as well as tension for compression lap splices, reinforcing bar theory must be applied and adhesive anchor systems must be qualified for recognition and use under the 2015 IBC before being used for reinforcing bar installation.
Shear Dowels
Strengthen an existing concrete structure
Strengthening an existing concrete structure through the use of shear dowels is a primary application of post-installed rebar. Though this is commonly done to improve the performance of concrete slabs and structures experiencing earthquake and seismic loads, the application is not limited to geographic areas experiencing these conditions.
Shear dowels are typically used to resist interface shear across a shear plane – the roughened joint between existing and new concrete. The primary shear mechanism – friction across the irregular surface – is enabled by the shear dowels that hold the surfaces together. Therefore, the standard design assumption is that the shear dowels are placed in direct tension as the irregular shear plane is translated laterally.
Starter Bars
Extend, repair and strengthen existing concrete structures
Post-installed starter bars are used to help extend, rehabilitate and strengthen existing concrete bridges, roadways and other common civil engineering structures. These applications often require enhanced resistance to extreme temperatures and corrosion from chemical exposure and naturally occurring ambient conditions.
Starter bars are typically used to resist tension and shear forces across beam-to-column and column-to-foundation joints. Starter bars are oriented perpendicular to the primary reinforcement of the existing concrete member in which they are installed.
Tension lap splices
Extension of existing reinforced concrete structures
Extending existing reinforced concrete structures such as slabs, walls and columns is the most common application for post-installed reinforcing bars. This helps facilitate expansion of floor space or address other functional changes in a particular structure. Non-contact tension lap splices in which tension loads are transferred between adjacent bars via compression struts and hoop stresses in the concrete directly surrounding the spliced bars are utilized to develop the yield strength of the new bars.
This application usually involves the installation of a large numbers of bars with close spacing, limited concrete cover and deep embedment depths.
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