Use this design aid to help determine the capacity of host structure columns and walls to withstand a variety of reactions from various end retention systems.

The tool has been pre-loaded with a variety of column catenary forces from most fabric and end retention systems.

Use the results to work with Engineering Express or your engineer in providing certified plans or retrofit options to permit the installation of end retention impact protection systems.



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End Retention Column Verification Calculator
About This Calculator
This column verification tool was written for the purpose of checking existing concrete or masonry columns for their ability to resist the added loads imposed by "end retention" shutters during a high wind event.
What Types of End Rentention Shutters are There?
End retention shutters come in two basic categories, "roll-down aluminum slat shutters" and "screen/fabric shutters". See the images below for examples of each.
Roll-Down Aluminum Slat Shutters						Screen/Fabric Shutters
Why is this Calculator Important?
Most exterior columns are not designed for the loads imposed by hurricane protection devices. It is important to verify that an exisitng column can support the additional loads of an end retention shutter before installation to avoid catastrophic failure of the column during a high wind event. This program checks whether or not an existing column with a shutter installed is within its design capacity for combined axial, moment and shear reactions. Imposed reactions from the shutters are obtained through manufacturer supplied data from their respective product approvals.
More About an End Retention Shutter:
An end retention shutter is a hurricane protection device designed to resist static wind loading as well as large and small missile impacts imposed on a structure during a high wind event. End retention shutters are unique since they can impose large reactions on the host struture along multiple planes in the form of a "normal" reaction and a "catenary reaction". See the figure below for an explanation of how these reactions are imposed on the host structure.
This calculator is owned by and Copyright 2016 Engineering Express®.  It shall not be used in whole or part without written permision from the firm.  Any results given shall be considered preliminary for estimating purposes only and shall not be valid for use without consulting with a licensed professional engineer and a final signed and sealed document. Sealed versions of this calculator are considered non-site specific. No warranty of any kind is offered with the use of this tool without such proper engineering consultation and documentation.
Photocopies of this document are not valid for use. Only Signed and Sealed Engineering shall be accepted.
			-Please Select Yes		Agree and Click Next to Continue

						1) Column Location Image:
Step 2: Preliminary Site Information
Fill this section to submit this calculator for review & certification:
Contractor Name:
Contractor Address:
Contractor City:
Contractor State:
Contractor Phone #:
This section required for all projects:						5) Column Type Image:
Project Name:
Project City:
Project State:	This Calculator is for Florida Only
NOTE: only the Zip + 4 will show on the printout, the address is for finding the zip + 4 only, this is not site specific Project Zip + 4
*Required fields
Enter the ID mark the column is referred to on the plans or schedule you are referring to 1) Column Location*	-Please Select Interior Corner			(see image)
2) Column Span 1*		inches		(see image)
3) Column Span 2*		inches		(see image)
4) Column Height*	Enter whole # only. This is the clear span of the column not including the beam above	inches		(from grade to top of column)
5) Column Type*	-Please Select 12 X 12 Filled Cell 16 X 16 Filled Cell 12 X 8 Poured Concrete 24 X 8 Poured Concrete 20 X 8 Poured Concrete 12 X 12 Poured Concrete
6) Column Bottom Condition*	-Please Select Column on Spread Footing With Slab At Grade Column on Spread Footing With Pavers At Grade Column on Grade Beam or Stem Wall With Pavers At Grade Column on Grade Beam or Stem Wall With Slab At Grade			(Cast in place concrete header assumed, alternate header conditions to be analysed on a site specific basis)		6) Bottom Column Condition Image:
Unbraced Height (Lx)		feet
Unbraced Height (Ly)		feet
This calculator is owned by and Copyright 2016 Engineering Express®.  It shall not be used in whole or part without written permision from the firm.  Any results given shall be considered preliminary for estimating purposes only and shall not be valid for use without consulting with a licensed professional engineer and a final signed and sealed document. Sealed versions of this calculator are considered non-site specific. No warranty of any kind is offered with the use of this tool without such proper engineering consultation and documentation.
This system is Copyright 2016 & is not to be reproduced in whole or part without the written conscent of this firm
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Step 3: Column Axial Loading
Do you know the axial load?			-Please Select No Yes		**If "No", calculator will assume a net axial load of 0 lbs
Enter it here:			Enter unfactored required axial loading. The calculator will incorporate live/dead load factors during analysis.	lb
This system is Copyright 2016 & is not to be reproduced in whole or part without the written conscent of this firm
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Step 4: Lateral Load Determination
Select Product to be Evaluated:		[Dynamic Dropdown]
Jamb connection type:		[Dynamic Dropdown]
Worst-Case Required			(psf, from your permit pack)
Wind Pressure:		Enter the largest, negative design pressure rating between the openings under review. Pressure inputs that exceed the maximum allowable shutter pressures per their respective approvals will display "NaN" in the reactions below.	or click to calculate)
	Distance is C/L of column to C/L of column or to wall endpoint Span 1:		inches (from step 2)
Size check:		If shutter span is within the allowable as specified in the product approval, "OK" will appear. If shutter span exceeds the product approval allowance and error will appear
PSF check:		If required pressure is within the allowable as specified in the product approval, "OK" will appear. If required pressure exceeds the product approval allowance and error will appear
	Distance is C/L of column to C/L of column or to wall endpoint Span 2:		inches (from step 2)
Size check:		If shutter span is within the allowable as specified in the product approval, "OK" will appear. If shutter span exceeds the product approval allowance and error will appear
PSF check:		If required pressure is within the allowable as specified in the product approval, "OK" will appear. If required pressure exceeds the product approval allowance and error will appear
					Jamb Connection Type Image (as selected above):
Column Location Image (as selected in step 2):
Linear Reactions From Product Approval
Span 1:	Rx		lb/ft
	Ry		lb/ft
Span 2:	Rx		lb/ft
	Ry		lb/ft
Calculated Net Reactions on Column
Net Loading:	Rx		lb/ft
	Ry		lb/ft
This calculator is owned by and Copyright 2016 Engineering Express®.  It shall not be used in whole or part without written permision from the firm.  Any results given shall be considered preliminary for estimating purposes only and shall not be valid for use without consulting with a licensed professional engineer and a final signed and sealed document. Sealed versions of this calculator are considered non-site specific. No warranty of any kind is offered with the use of this tool without such proper engineering consultation and documentation.
This system is Copyright 2016 & is not to be reproduced in whole or part without the written conscent of this firm
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Step 5: Final Column Checks
Summary:
Average Live/Dead Load Factor =		Worst case factor of 1.6 is used for all column design strength checks. If exact average live/dead load factor is known, user may enter exact factor here. Factor must be between 1.2 and 1.6. See ASCE 7-10 for more on this topic or consult a professional engineer.
NOTE: value MUST be between 1.2 and 1.6
Axial Check:
Axial Compression Capacity =				lb
Axial Required =				lb	Column Axis Orientation Diagram
Factored Axial Required =				lb	(As Selected in Step 2)
Moment Check (about y-axis):
Moment Capacity (about y-axis) =				lb-ft
Moment Required (about y-axis) =				lb-ft
Factored Moment Required (about y-axis) =				lb-ft
Moment Check (about x-axis):
Moment Capacity (about x-axis) =				lb-ft
Moment Required (about x-axis) =				lb-ft
Factored Moment Required (about x-axis) =				lb-ft
Shear Check:
Shear Capacity (y-direction) =				lb
Shear Capacity (x-direction) =				lb
Shear Required (y-direction top) =				lb
Factored Shear Required (y-direction top) =				lb
Shear Required (x-direction top) =				lb
Factored Shear Required (x-direction top) =				lb
Shear Required (y-direction bottom) =				lb
Factored Shear Required (y-direction bottom) =				lb
Shear Required (x-direction bottom) =				lb
Factored Shear Required (x-direction bottom) =				lb
Final Result:
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This calculator is owned by and Copyright 2016 Engineering Express®.  It shall not be used in whole or part without written permision from the firm.  Any results given shall be considered preliminary for estimating purposes only and shall not be valid for use without consulting with a licensed professional engineer and a final signed and sealed document. Sealed versions of this calculator are considered non-site specific. No warranty of any kind is offered with the use of this tool without such proper engineering consultation and documentation.
This system is Copyright 2016 & is not to be reproduced in whole or part without the written conscent of this firm
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