Where shear is transferred through the anchor rods in lightly loaded connections, oversized holes to accommodate erection tolerances prevent predictable shear transfer through the anchors. Because of this, shear lugs, embedded columns, or other alternatives are likely better options for transferring shear unless the loads are small. If anchors rods are used to resist shear forces from a base plate, they may also be subject to flexure. Shear in Anchor Rod for Base Plates with Grout Pad or Stand-Off All of the applications typically provided the same results for anchor groups subjected to concentrically applied tension, but results varied for anchor groups subjected to a bending moment or to shear. In addition to the survey, example problems were run comparing the results with the survey responses (see Example Problems below). RAM Connection V8i Standalone by Bentley ® Systems (Version 8.0)Įach vendor filled out a survey describing the assumptions and analysis methodology that its software used for various limit states, and identified its software’s features. RISABase by RISA Technologies (Version 2.1)ī. DS Anchor by Dimensional Solutions (Version 5.0.0)Ī. Quick Anchor by SK Ghosh Associates (Version 2.0.4)ī. Simpson Strong-Tie ® Anchor Selector ™ (Version 4.11.0.0)Ī. Seven different software applications are discussed below (see table), and are broken into the following three categories.ġ) Proprietary Anchor Manufacturer Softwareī. Different applications can provide significantly different results for what may appear to be the same input parameters. It is incumbent upon the designer to be aware of these and work within the capabilities of each software application. However, each application has its own default set of assumptions, features, and limitations. Unfortunately, over the past decade, a few paragraphs of text and an allowable stress design table have turned into the 48 pages of provisions and commentary that now reside in Appendix D of ACI 318-11.įortunately, there are several software applications that can assist with the heavy lifting of anchor design. One of the advantages of the CCD method was that it used a simpler rectangular area, rather than overlapping circular cone areas. The scope of the provisions expanded when they appeared in Appendix D of ACI 318-02, which standardized the analysis methodology for post-installed anchors. The new provisions also clearly identified specific limit states, which may not have been apparent in older design tables.

The CCD method provided better predictions of concrete breakout strengths than the previously common 45-degree cone method. It was initially a strength design option and was limited to cast-in-place anchors only. Concrete Capacity Design (CCD) has been a code methodology for anchor design since it was introduced directly into section 1913 of the 2000 International Building Code (IBC).

Hilti profis anchor viewport