See the AISC Design Guide #1 starting on page 4 for a description of the values present here. When a load combination results in only an axial load being applied, the summary of information below is displayed. Note that Maximum Bending Stress is calculated using the plastic section modulus, in keeping with AISC Design Guide 1, Second Edition. This is the governing case for the base plate. The module will examine the results for all of the load combinations and determine which gives the extreme condition of stress and presents it the Overall Results item. The very first item in the list will always say Overall Results. Click one of the load combinations in the list to view results specifically for that load combination. The Results tab contains a list of load combinations on the left and a summary of all the calculated values for each load combination on the right. The screen capture below shows a sample of the load combinations factors: This tab displays the load combinations used for either the ASD or LRFD selections. Spacing of rows when more than one row is used. The "Row" referred to is a row of bolts at the plate edge that will take any tension force. Net shear capacity of bolt after all capacity factors are applied.ĭistance from edge of plate to center of bolt closest to edge. Net tension capacity of bolt after all capacity factors are applied. Items on this tab specify the strength and location of the anchor bolts that will resist shear and tension.ĭescription of the bolt for your reference. This column of entries specifies the moment that the column applies to the plate. This column of entries specifies the shear applied parallel to the plate and to be resisted by the anchor bolts. Note that positive values represent downward loads. This column of entries specifies the axial load applied to the base plate. Use the buttons to quickly change the values.the results are instantly recalculated.Įnter the support dimensions that will be used to calculate the allowable bearing pressure increase, A1 * sqrt(A2/A1). Or click the button to display the built-in steel database and select a section.Ĭlicking this button will allow you to enter the steel properties.Įnter the length, width and thickness of the base plate. The name must be typed just as it appears in the 13th Edition AISC Steel Construction Manual. The module will look up the section in the Steel database and, if found, will retrieve the values. Type the AISC section name in the entry and press. This entry allows the value to be modified. This entry allows the value to be modified.ĪISC 360 Section J.8 specifies Phi as 0.6. Specify the yield strength of the base plate material.Įnter the capacity reduction factor, Omega, to be used in ASD per AISC 360.Įnter the capacity reduction factor, Phi, to be used in LRFD per AISC 360.Ģ8-day compressive strength of concrete used to support the base plate.ĪISC 360 Section J.8 specifies Omega as 2.5. Select between ASD or LRFD design methods. Determining the bearing pressure by this method might result in thicker plates if bending stress is high between webs or within pipe or tube walls. Maximum Fp is used to calculate ''design'' minimum plate size. If plate area is larger than needed, the larger "m" and "n" cantilevered dimensions could result in a thicker plate than would be required if the pressure was calculated by the other option.īearing Area = P / Fp : Base plate is considered flexible with bearing concentrated close to column. A brief description of each choice is provided below the buttons for each selection.įull Bearing : Bearing is assumed uniform under plate. This selection controls the upward pressure used to design the plate. The right side of this tab will look slightly different for LRFD: Under these conditions, a red error message will be displayed at the bottom of the window to notify you of this condition. When the summation of factored axial loads in a load combination is negative, then uplift controls and the module will not calculate. This module does not handle conditions where NET UPLIFT is present. extreme eccentricity conditions where anchor bolts are required.where the resultant eccentricity is outside the middle third resulting in a triangular pressure distribution on part of the base plate, and.
#Masonry bearing design tedds full#
where the resultant eccentricity is within the middle third for full bearing pressure,.where the resultant eccentricity is zero,.This module handles base plate design for the following conditions:
#Masonry bearing design tedds manual#
This module designs steel column base plates according to the 13th Edition AISC Steel Construction Manual and the AISC Design Guide 1, Second Edition.
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