LENTONÂ® STEEL FORTRESS Punching Shear Reinforcement System
LENTONÂ® STEEL FORTRESS is a shear reinforcement system that provides a simple solution to the complex problem of brittle punching shear. LENTON STEEL FORTRESS consists of a continuous flat steel strip that has holes punched along its center and is pre-bent in the plant into a custom-shaped profile to fit over the top of the flexural reinforcement bars in the concrete slab. The steel strips in the LENTON STEEL FORTRESS System meet or exceed ASTM A505-87 requirements with a minimum yield strength of 72,500 psi (500 MPa) and a minimum elongation of 11%.
The LENTON STEEL FORTRESS System is supplied to the site individually boxed on a per column basis and is custom made to meet your specific application needs. Because the product installs over the uppermost layer of main reinforcing bars, placement is fast and easy. This placing method accommodates unexpected design changes and makes on-site inspection simple. In addition, the horizontal length of the system provides ample space to accommodate irregular rebar placement.
The capability of the LENTON STEEL FORTRESS System to anchor to the top tier reduces the possibility of the induced shear cracks bypassing the shear reinforcement, thus preventing brittle punching shear failure. Because the LENTON STEEL FORTRESS can encapsulate the upper layer without unduly affecting cover, it overcomes the inability to anchor over the uppermost tensile reinforcement layer that some other systems encounter.
The LENTON STEEL FORTRESS has many advantages over other traditional and proprietary punching shear reinforcement systems. It minimizes the need for stud reinforcement systems, column capitals, drop panels and additional stirrups. It also optimizes flying forms, saves time and labor by going in after the rebar is placed, and is exceptionally lightweight and cost effective. In addition, the system develops its yield strength over a much smaller length, enabling it to be used in thinner concrete slabs.
The product is patent protected, ICCÂ®-ES recognized: Report ER-5668 and certified by the City of Los Angeles Report RR25486. It conforms to ACI 318.02, as well.
- Cost effective
- Installs quickly and easily after rebar placement saving both time and labor
- Allows for thinner columns and lower profile concrete slabs
- Prevents brittle punching shear failure
- Eliminates column capital and drop panels
- Easily verified by onsite visual inspection
- Lightweight, easy to move on site
- Fits into place around post-tension tendons
- ICC Recognized: Report ER-5668
- City of Los Angeles Certified: Report RR25486
- Conforms to ACI 318.02
- Flat Slab construction
- Shear reinforcement
- Replaces stirrups and stud reinforcement systems
Patent protected in US (patent 6,003,281), Europe (patent 823,954) and numerous other countries.
The LENTONÂ® STEEL FORTRESS Design Calculator
The LENTON STEEL FORTRESS Design Calculator Software is now available for download. The software is used to determine the amount of punching shear reinforcement needed around a column head and the configuration in which to place it. Download the calculator here
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