Here’s a summary of our 2020 calculators help hover tips

ADDITION ROOF TYPE Select Monoslope for studio, shed, or other single slope style roofs.  Gable is also known as A-Frame
ASCE EXPOSURE CATEGORY See help for explanations. If unsure, use C for non coastal, D if near coastal or large flat terrains.
ASD (PRESSURES) Allowable Stress Design – where the capacity of the member in question is reduced to an allowable factored limit as opposed to ultimate where the load is factored up.
BEAM ALLOWABLE SPAN Clear Beam Span of the panel or member in question.
CLASSIFICATION Select screened for removable acrylic sliders, open if 3 or more sides are open, solid for glass or panels.
CODE YEAR Select ASCE 7-16 only for the 2020 Florida Building Code or 2018 International Building Code
COLUMN ALLOWABLE HEIGHT If result is less than allowable ceiling height, result shall include kneewalls or other supporting structures.
COLUMN SPACING Average on center spacing between columns, in decimals (0.5= 6”)
DEAD LOAD Typically the load of the roof panels, shingles, etc.
DEFLECTION The bending limit of a member – see chapter 16 of the building code, typically L/180 for glass, L/60 for screen, L/240 for plaster
ELEVATION ABOVE SEA LEVEL For Every 1,000 ft above sea level, atmospheric pressure and corresponding wind pressure is decreased per ASCE 7-16.  Select 0 if unsure or at sea level.
ELEVATION OF INSTALLATION For buildings over 60, a reduction is permitted for positive pressures based on the actual elevation.
ENCLOSURE TYPE The type of installation being installed – typically open or enclosed (screened).
IMPACT SHUTTER ANALYSIS If yes, the calculation for area of opening switches from Width * Height to Height * Height/3. It operates on the assumption that impact shutters are tested infinite width.
LIVE LOAD Total factored live load such as snow or other code required loading
MARK This is your label to help identify the answer on accompanying layout drawings.
MEAN ROOF HEIGHT, MRH This is the average roof height from the peak to the eave. See image below
MEMBER TYPE Beam is the eave edge beam above openings. Columns are the supporting mullion posts.
MIN OVERALL BLDG DIMENSION This is the shortest building dimension.  The End zone 5 is 10% of this value, 40% of height,  but not less than 3’
OVERHANG Roof span beyond supported area
POSITIVE/NEGATIVE Positive is the force inward into the building, negative is pushing out. Expect larger negative values due to building pressurization.
REACTION The perpendicular force at each end of the member in consideration. Typically used to verify anchorage shear.
ROOF SLOPE If the roof slope is less than 10 degrees, there is a slight reduction in pressure. If complex roof or unsure, set to >= 10 degrees.
ROOF SPAN The total supported clear roof span between supports.
TOPOGRAPHY FACTOR Kzt Use 1.0 for flat terrain. For areas on or near hills, this will need to be calculated elsewhere. Worst case is 3.0. Refer to the help & ASCE-7 for more.
TOTAL LOAD The sum of all imposing loads in pounds per sq foot. These loads are factored in accordance with (Chap 16?) of the building code. Consulta a design professional to be sure
ULTIMATE (PRESSURES) The factored total force acting on a member. This is where the load value is factored up rather than reducing the allowable stress of a member in question.
WIND DIRECTIONALITY FACTOR Kd This is generally 0.85.  Change to 1.0 only if required by building department or special use case directed by the architect / engineer.
WIND VELOCITY, Vult The peak 3-second gust wind speed. Consult your building department or engineer for governing codes.
ZONE ASCE wind pressure location zone – Use Zone 4 for interior (non corner) openings. Zone 5 are any corners per sketch below & help.  IF UNSURE USE 5!
Aug 19, 2020   57    Engineering Principles, General    
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