9/24/2019 Anchor Bolt Design Spreadsheet
CIVILBAY STRUCTURAL ENGINEERING SPREADSHEET CONCRETE ANCHORAGE ANCHOR BOLT DESIGN. User can choose one of the three options below to select the spreadsheet that meets user's design requirements. All three options will direct user to the same spreadsheet.
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Very useful and easy to use spreadsheet for designing all common types of holding down bolts. This includes cast-in bolts, post-drilled anchors (where resin or grout is used) and holding down bolts with anchor plate (typically used with positioning cones that are grouted in once columns are in position). The spreadsheet includes diagrams that clearly represents the bolt type being designed. The effective conical surface area is calculated for two bolts in accordance with Concrete Society Advise No 5. Very useful spreadsheet for engineers working with steel frame buildings.
A clear and easy to read output (all on a single page);- In-spreadsheet help notes;- Quick summary of results;- Covers all common types of holding down bolts:a) cast-in;b) post-drilled (i.e.
Anchor bolts are used extensively as foundation bolts for rotating equipments like machines and structural members like towers. The American Concrete Institute (ACI) 318 Appendix D has extensive guidelines for designing concrete anchor bolts.This series of eight articles will cover all the design guideline of the ACI code with the help of the following concrete anchor foundation bolt example:Problem statement of the design exampleFig.1: Anchor Bolt design Example Plan ViewFig.2: Anchor Bolt design Example ElevationSee the above two figures (Fig.1 and Fig.2) and design the cast in place anchor bolts according to the arrangement shown. Consider the factored tensile load as 20000 lb, factored shear load as 2300 lb and compressive strength of the concrete as 3500 psi. Also assume that the column is mounted at the corner of a large concrete slab.Design solutionThe aim of this whole exercise is to the design tensile strength and design shear strength of the group of anchor for a selected anchor bolt diameter and check if the design strengths are higher than the applied loads. I’m interested in the end result of anchor bolt strength as to how proper installation of the bolts plays in the ultimate results of it’s strength.
If you install the bolts in wet concrete by pushing it into the concrete, you get air gaps and bubbles, off set bolts, height variations and this plays into it’s strength calculations. If you do the calculations based on a perfect installation, it becomes invalid when considering the real time install.What can one do to make correct calculations based on installation variables? Of course vibrating the concrete mix will definitely help get rid of the bubbles surrounding a bolt, but many other factors such as temperature, speed of the setting process, and length of time to vibrate, all are factors that can change the results. The big issue is that many contractors will not vibrate the foundation and that is the question, really.
If you assume no vibration and inserting an anchor bolt into the concrete as compared to having an anchor bolt suspension system in place with the bolt in place before the pour, there must be some data on that, all conditions being equal that can be measured and quantified as to the strength variation.Also, do you have any calculations or data that shows how much pressure in p.s.i. Is put on an anchor bolt that is being held by a suspension system when the concrete is flowing around the bolt when it is being poured into the foundation forms?
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