Hilti’s seismic research includes detailed investigation of product performance under simulated seismic conditions and full-scale system testing. This multilevel approach helps to capture the complexity of fastening systems behavior under seismic conditions. Earthquakes can affect a wide range of construction products that Hilti supplies including concrete anchors, powder actuated fasteners, mechanical/electrical supports, and firestop systems for fire containment. Hilti is pioneering research to extensively test systems for earthquake performance in order to support our customers with recommendations for design applications.
Post-Installed Seismic Anchor Design
The International Building Code (IBC 2009) references the design provisions issued by the American Concrete Institute (ACI) in ACI 318-08, Appendix D, which provides methods to calculate the design capacities of anchorages under seismic conditions according to the strength design methodology (ultimate limit states). These provisions apply to structures located in medium to high seismic zones (Seismic Design Categories C, D, E, or F), where the concrete base material shall be assumed to be cracked unless otherwise demonstrated.
Post-installed anchors designed using the methods in ACI 318-08, Appendix D, must be pre-qualified by extensive testing under ACI 355.2. The International Code Council (ICC) Evaluation Service provides a path to prequalification through acceptance criteria AC 193 for mechanical anchors and AC 308 for chemical anchors. These criteria define the testing methods and assessment procedures to develop design parameters compliant with Appendix D.
Specific product characteristics as well as material safety factors can be found in the Evaluation Service Report (ESR) issued by ICC, which enable the determination of the product resistances such as concrete breakout, pull-out, tensile and shear steel capacities. ICC-ES evaluation service reports and acceptance criteria can be found at www.icc-es.org
Hilti PROFIS Anchor design software has the capability of performing seismic calculations according to ACI 318-08, Appendix D. Choose from a wide selection of chemical and mechanical anchoring systems that have been pre-qualified for use in seismic zones per the ICC-ES evaluation service reports. Discover how to use PROFIS Anchor to perform seismic calculations by following the link below.
Learn more about PROFIS Anchor seismic calculations
Metal Deck Fastening Seismic Solutions
When attaching steel deck to structural steel or bar joist, Hilti offers solutions for virtually all fastening needs, including end and side laps as an economic, productive and reliable alternative to welding.
With one of the world’s largest and most flexible deck diaphragm test frames, Hilti can conduct full-scale static and seismic testing of entire deck sections with up to 350 fastening points to assess parameters like fastener performance and energy dissipation. This allows Hilti to test and develop powder-actuated and screw fastening systems suitable for earthquake zones in conjunction with various metal deck systems.
One of the most important factors to be considered when designing steel deck diaphragms for seismic load cases is ductility and the ability of the system to dissipate energy during cyclic earthquake loading.
Besids the steel deck itself, Hilti's mechanical powder-actuated and screw fastening systems can significantly contribute to a ductile behavior.
The videos below show a lap-joint shear test comparison of a Hilti X-ENP-19 powder-actuated deck fastener vs. 5/8” diameter arc spot puddle weld (20 gauge steel deck) illustrating the ductility difference between the two steel deck fastening methods.
Hilti = Ductile; Puddle Weld = Non-Ductile