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HIT-RE 500-SD Epoxy Anchor for Strength Design

HIT-RE 500-SD offers the designer a strength design solution in compliance with the latest building codes for adhesive anchors. HIT-RE 500-SD supports threaded rod and rebar dowelling applications in all seismic design categories under the 2003 and 2006 International Building Code® (IBC). Designers have the flexibility of designing adhesive anchor and rebar installations in solid concrete with rotary-hammer or diamond cored holes and in holes as deep as 20 times the rod or bar diameter.

Summary of Changes to ICC-ES Evaluation Reports of Concrete Anchors
The ICC-ES has modified ESRs for anchors in concrete to reflect the requirements of the most recent editions of the International Building Code. In conformance with the 2003 and later editions of the IBC, newer acceptance criteria (AC193, AC308) investigate a wider range of conditions than older assessment criteria, and are intended to provide the necessary parameters for strength design of anchors in accordance with ACI 318 Appendix D. Please see the summary of the changes to the ICC-ES evaluation reports and easy understandable tables which illustrate the new approval landscape as of January 2007.

If you have additional questions or would like to speak to a specialist about this product, or related products, please contact us at (866) 445-8827.

Frequently Asked Questions:

What does "Cracked Concrete" mean?

The design of reinforced concrete traditionally assumes that concrete is cracked wherever tensile stresses might occur (f_t > f_r). Cracks may be caused by external loads, as well as concrete creep and shrinkage, temperature variations, and settlement. As such, many reinforced concrete members are designed under the assumption that the concrete is cracked under service load. Additionally, concrete structures in regions of moderate to high seismic risk are designed assuming cracked concrete conditions.

What does "Tension Zone" mean?

The Tension Zone of a concrete member is the region which is subject to tensile stresses as a result of the loading condition. The tension zone is where cracking will typically occur, as the strength of concrete in tension is roughly 10% of that in compression. In this zone, the concrete must crack so the reinforcing steel will be activated to resist the tensile stresses. An example of this condition occurs on the underside of a suspended slab.

Do post-tensioned slabs also have a tension zone?

It is possible to design a post-tensioned member such that no tensile stresses exist under service loading. However, in the absence of information to the contrary, it is always appropriate to assume that the underside of a slab is in tension, and therefore, cracking is likely to occur.

Why are anchors for cracked concrete more expensive?

The requirements regarding functionality and reliability of an anchor qualified for cracked concrete applications are very demanding. In order to meet these requirements higher grade materials, additional manufacturing steps and numerous qualification tests are necessary. This results understandably in higher manufacturing costs.

How does a follow-up expansion work?

If a torque-controlled expansion anchor, such as the KB-TZ or a HSL-3, is installed in a location where a crack is initiated, the diameter of the drilled hole will increase by a slight amount. When this anchor is loaded in tension under these circumstances, the anchor body of the KB-TZ or HSL-3 will displace through the wedges to make up for the enlargement of the hole, resulting in follow-up expansion. Follow-up expansion essentially means that the anchor will not lose its hold if concrete cracking occurs.

How do I know whether I have to deal with cracked concrete?

Overhead concrete anchoring applications should be engineered assuming cracked concrete conditions. Additionally, in support areas, the top side of slabs and continuous beams may be in tension. Regions of the country with moderate to high seismic risk require concrete structures to be designed assuming cracked concrete conditions. If you are unsure, contact a structural engineer.

How do I know which building code governs on my construction project?

The governing building code will be shown towards the front of the spec book in the zero sections. For instance, the regulatory requirements section of MasterFormat 2004 is 01 40 00. Note the code adopted by a specific jurisdiction may change over time, so be sure to check with your local building official.

Which anchors are suitable for cracked concrete?

• Hilti has qualified three different post installed mechanical anchors in cracked concrete for the North American market, which also meet the requirements of the International Building Code (IBC) 2003 and beyond.
  HDA Undercut Anchor (keying function)
• HSL-3 Heavy-Duty Sleeve Anchor (follow-up expansion)
  

• Kwik Bolt TZ Expansion Anchor (follow-up expansion)

Additional anchors, including chemical anchors, will follow in near future.

Where do I find the information on whether an anchor is suitable for seismic and/or cracked concrete?

The Anchor Selection Guide of the Hilti Product Technical Guide (PTG) is an excellent resource for Hilti anchors, including suitability for use in seismic zones and/or cracked concrete. This section starts on pg. 84 of the 2006 PTG or pg. 69 of the 2005 PTG. Section 5.0, Conditions of Use, of the specific ICC-ES evaluation reports, will state whether the anchor has met the applicable ICC test requirements -- NOTE that ICC requirements, suitability, and load values may vary from the Hilti Product Technical Guide.


Which anchors fulfill the requirements of 2003 IBC?

The ICC-ES Evaluation Service Reports (ESR) lists which building code the products are in compliance with in section 1.0 Evaluation Scope.

Currently, the following Hilti products are listed in compliance with the 2003 IBC:

CRACKED CONCRETE AND SEISMIC APPLICATIONS

• HDA Undercut Anchor (ICC ESR-1546)
  

• HSL-3 Heavy-Duty Sleeve Anchor (ICC ESR-1545)
  

• Kwik Bolt TZ Expansion Anchor (ICC ESR-1917)
  

• HCI Cast-In Anchor (No ESR, cast-in anchors specifically cited in code)

UNCRACKED CONCRETE WITHOUT SEISMIC AND GROUT-FILLED CMU WITH OR WITHOUT SEISMIC

• HIT HY-150 MAX Adhesive (ICC ESR-1967)

Are there any chemical anchors which are IBC 2003 compliant?

ICC ESR-1967 was recently published for HIT-HY 150 MAX. The evaluation report references the 2003 IBC. This evaluation report does not recognize all base materials for all conditions of use. HIT-HY150 MAX is listed as being suitable for seismic and non-seismic applications in grout-filled concrete masonry units (CMU) and for non-seismic concrete applications.

Hilti expects to have an ICC Evaluation Service Report for cracked and uncracked concrete in accordance to AC308 that meets the IBC 2003 for our HIT System in 2007.