{"id":33323,"date":"2026-04-27T12:47:42","date_gmt":"2026-04-27T12:47:42","guid":{"rendered":"https:\/\/protasoftware.com\/technical-manuals\/foundation-modelling-and-design\/strip-footing\/"},"modified":"2026-06-19T12:37:47","modified_gmt":"2026-06-19T12:37:47","slug":"strip-footing","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/wiki\/strip-footing\/","title":{"rendered":"Strip Footing"},"content":{"rendered":"
For a strip footing to be defined under a series of columns\/walls, foundation beams must have been defined beforehand between the columns\/walls.<\/span><\/span> <\/div>\n

ProtaStructure performs the strip footing calculations for all load combinations and draws moment and shear diagrams as a combination envelope. Besides these, calculations are also performed based on coefficient of subgrade reaction interval.<\/span><\/span><\/span>
<\/span><\/p>\n

Before inserting a footing:<\/span><\/span><\/span>
<\/span><\/p>\n

    \n
  1. The building model must be completed and analysed, so that the column and wall axial loads and moments are determined.<\/span>
    <\/span><\/li>\n
  2. The foundation storey 0 (<\/span>ST: 0<\/span><\/b>) must be set as the current storey.<\/span>
    <\/span><\/li>\n<\/ol>\n

    Strip Footing Definition<\/span><\/span>
    <\/span><\/h2>\n

    To define a new Strip Footing:<\/span><\/span><\/span>
    <\/span><\/p>\n

    \n
    1. Insert the foundation beam(s) that will be used in the strip footing by going to top "Modelling" tab > Beam > Foundation Beam<\/span><\/span><\/div>\n
         The beams must be defined such that vertical members (i.e. columns and walls) are covered in the strip footing (at their bottom endpoints).<\/span>
    <\/span><\/div>\n
    2. Multiple select all the beams that will be included in the strip footing. (Note that, beams can be selected in any order)<\/span>
    <\/span><\/div>\n
    3. Right-click to display the shortcut menu and select "<\/span><\/span>Insert Strip Footing<\/span><\/span><\/i>" option. The \u201c<\/span><\/span>Strip Footing<\/span><\/span><\/i>\u201d dialog will be displayed. <\/span><\/span><\/div>\n
         Alternatively, click on <\/span>"<\/span><\/span>Insert Strip Footing<\/span><\/span><\/i>" icon at the top ribbon. <\/span><\/span>
    4.  Press the "<\/span><\/span>Design<\/span><\/span><\/i>" button to design the footing. Refer to the <\/span><\/span>Strip Footing Design<\/a><\/span><\/span> section below for more information on this topic.<\/span><\/span><\/span><\/div>\n
    5.   After completing the design of the strip footing, press the "<\/span><\/span>OK<\/span><\/span><\/i>" button to complete the insertion of the footing. <\/span><\/span><\/div>\n<\/blockquote>\n
    \n
    \"Alert\" <\/p>\n
    Note that "OK" button will not be available if the design of the footing is not completed correctly.<\/span><\/span> <\/div>\n

    <\/span><\/div>\n<\/div>\n

    Editing an Existing Strip Footing<\/span><\/span>
    <\/span><\/h2>\n

    In order to edit an existing strip footing:<\/span><\/span><\/span>
    <\/span><\/p>\n

      \n
    1. Select an existing strip footing,<\/span>
      <\/span><\/li>\n
    2. Right-click to load the "<\/span><\/span>Properties<\/span><\/span><\/i>" form and modify the design of the strip footing,<\/span>
      <\/span><\/li>\n
    3. Press the "<\/span><\/span>OK<\/span><\/span><\/i>" button in the "<\/span><\/span>Properties<\/span><\/span><\/i>" form to update the footing.<\/span>
      <\/span><\/li>\n<\/ol>\n

      You can repeat this process to as many members as you wish. One member at a time can be edited by this method.<\/span><\/span><\/span>
      <\/span><\/p>\n

      Beams of the Strip Footing<\/span><\/span>
      <\/span><\/h2>\n

      Beams that will be included in the strip footing must be defined prior to insertion of the strip footing. These beams must be defined based on the following rules and constraints:<\/span><\/span><\/span>
      <\/span><\/p>\n

      Beam Dimensions and Eccentricities<\/span><\/span><\/u>
      <\/span><\/h4>\n

      The dimensions of the beams included in a strip footing must be identical. Beams with different section dimensions and beam on different axis cannot be used in a single strip footing.<\/span><\/span><\/span><\/p>\n

      Strip Footing Design<\/span><\/span>
      <\/span><\/h2>\n

      After selecting the footing beams, the "<\/span><\/span>Strip Footing<\/span><\/span><\/i>" dialog will be loaded when "<\/span><\/span>Insert Strip Footing<\/span><\/span><\/i>" option is picked in the shortcut menu displayed by right-clicking.<\/span><\/span><\/span>
      <\/span><\/p>\n

      The "<\/span><\/span>Strip Footing<\/span><\/span><\/i>" dialog can also be displayed when the "<\/span><\/span>Properties<\/span><\/span><\/i>" option is picked in the shortcut menu displayed by right-clicking after selecting an existing strip footing.<\/span><\/span><\/span><\/p>\n

      <\/span><\/span>
      <\/span><\/div>\n

      Strip footing calculations are performed based on beam on elastic foundation method (\u201c<\/span><\/span>Winkler Method<\/span><\/span><\/i>\u201d). Calculations can be done either for all load combinations or for an envelope of all load combinations. Also, envelope calculation can be done for an interval of coefficient of subgrade reaction.<\/span><\/span><\/span>
      <\/span><\/p>\n

      In order to determine concrete grades, steel grades and rebar size that will be used in Strip Footing Design, first pick \u201c<\/span><\/span>Materials<\/span><\/span><\/i>\u201d option in \u201c<\/span><\/span>Building setout<\/span><\/span><\/i>\u201d tab. Then, press \u201c<\/span><\/span>Foundation Floor<\/span><\/span><\/i>\u201d tab in \u201c<\/span><\/span>Material<\/span><\/span><\/i>\u201d dialogue.<\/span><\/span><\/span>
      <\/span><\/p>\n

      Strip Footing Calculatio<\/span><\/span><\/span><\/span><\/b>n<\/b><\/span><\/span><\/span><\/span><\/u>
      <\/span><\/div>\n
        \n
      1. Loading and geometry information of all related columns, walls and beams will be loaded into \u201c<\/span><\/span>Strip Footing<\/span><\/span><\/i>\u201d dialog. Only the information in white field can be modified.<\/span><\/span>
        <\/span><\/li>\n
      2. Insert the label in "<\/span><\/span>Strip Footing Label<\/span><\/span><\/i>".<\/span><\/span>
        <\/span><\/li>\n
      3. Select the combination using the pulldown menu in \u201cLoading\u201d section for which the calculations are to be performed.  If you want to obtain a design envelope for all combinations then check \u201cDesign Envelope\u201d checkbox.<\/span><\/span>
        <\/span><\/li>\n
      4. Enter the value of \u201cSubgrade Coefficient of Reaction\u201d into the \u201cSubgrade Reaction Coefficient\u201d field.<\/span><\/span>
        <\/span><\/li>\n
      5. If you want to perform the calculations for an interval of subgrade reaction values, check \u201cStep\u201d checkbox. Then enter the second subgrade coefficient value into the second field enabled. By using the spin buttons, indicate the number of steps for interval calculation.<\/span><\/span>
        <\/span><\/li>\n
      6. For the determination footing width, select the appropriate method of \u201cSelection of Soil Stress for Calculating the Footing Width\u201d.<\/span><\/span>
        <\/span><\/li>\n
      7. Click on \u201cDesign\u201d button. <\/span><\/span><\/li>\n
          \n
        1. Note that, \u201cDesign Envelope\u201d and \u201cStep\u201d boxes must be checked together, if you want to do the calculations both for subgrade reaction and combination envelope.<\/span><\/span>
          <\/span><\/li>\n<\/ol>\n
        2. Results of the calculation will be loaded into \u201cStrip Footing Design Results\u201d form. <\/span><\/span><\/li>\n
            \n
          1. Diagram of Soil pressure, shear and moment diagrams are shown. <\/span><\/span><\/li>\n
          2. Click "Design Report" to review the analysis and design<\/span><\/span><\/li>\n
          3. Click "OK" to complete the design & close the dialog. <\/span><\/span><\/li>\n<\/ol>\n
          4. The main Strip Footing dialog will now reflect the design :  <\/span><\/span><\/li>\n
              \n
            1. Footing Width will be auto-designed to least value to pass the maximum allowable soil stress. <\/span><\/span>
              <\/span><\/li>\n
            2. Review the designed width carefully and over-write or round up this width if required. Do not reduce the width over-wise it will be insufficient. <\/span><\/span>
              <\/span><\/li>\n
            3. If the footing width is modified, click "Design" to recheck the design; followed by re-generating the Design report.  <\/span><\/span><\/li>\n<\/ol>\n
            4. You can perform the design of the foundation beams by selecting \u201cFoundation Beams\u201d in \u201cDesign\u201d tab.<\/span><\/span>
              <\/span><\/li>\n<\/ol>\n

              Selection of Soil Stress for Calculating the Footing Width<\/span><\/span><\/u>
              <\/span><\/h4>\n

              Prior to commencing the design of the strip footing, it\u2019s necessary to determine the method of which soil pressure under the footing will be calculated.  For this purpose, select the appropriate method among the methods given in the \u201cSoil Pressure Selection Criteria for Calculating the Footing Width\u201d field. <\/span><\/span><\/span>
              <\/span><\/p>\n

              Default method is \u201c<\/span><\/span>Maximum Soil Stress<\/span><\/span><\/i>\u201d that is used normally for soft soil. Especially for firm soil, other methods, namely, \u201c<\/span><\/span>Average in L\/4 Column Region<\/span><\/span><\/i>\u201d, \u201c<\/span><\/span>Average in L\/2 Column Region<\/span><\/span><\/i>\u201d can also be used. Nevertheless, these two methods must be used with care as calculated soil pressure can decrease without any control resulting in an unsafe design.<\/span><\/span><\/span>
              <\/span><\/p>\n

              Left and Right Extensions<\/span><\/span><\/u>
              <\/span><\/h4>\n

              There are two fields reserved for the extensions at the beginning and at the end of the strip footing.<\/span><\/span><\/span>
              <\/span><\/p>\n

              Enter the cantilever (extension) lengths \u201cRight Cantilever\u201d and \u201cLeft Cantilever\u201d fields, if you want to include such extensions in the design.<\/span><\/span><\/span>
              <\/span><\/p>\n


              <\/span><\/div>\n
              <\/div>\n

              <\/span><\/p>\n

              Footing Width<\/span><\/span><\/u>
              <\/span><\/span><\/h4>\n

              If you do not provide any values in this field before calculations, required footing width will automatically be calculated. You can ideally enter width values other than the calculated one in this field. But in this case you must click on \u201cDesign\u201d button again. If the required width is greater than the value you entered, then calculated value will be used. If the entered value is greater than required width, then entered value will be used.<\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Footing Depth<\/span><\/span><\/u>
              <\/span><\/span><\/h4>\n

              Footing Depth must be specified before design. This value can be changed if necessary, but design must be repeated in this case.<\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Footing Bar Size<\/span><\/span><\/u>
              <\/span><\/span><\/h4>\n

              Enter the steel diameter to be used in footing design. If bar spacing is calculated too dense, specify a larger diameter.<\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Column List<\/span><\/span><\/u>
              <\/span><\/span><\/h4>\n

              Information about a column residing on a strip footing alignment can be adjusted using the column list table. Do the necessary modification by directly clicking in the table cells. Data fields in the table are explained below.<\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Column Name<\/span><\/span><\/u>
              <\/span><\/span><\/h5>\n

              Name of the column defined in Graphic Editor is written here.<\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Column Section <\/span><\/u>(<\/span>b-column\/<\/span><\/u><\/span>e-column)<\/span><\/span><\/u>
              <\/span><\/h5>\n

              Length (b-column) of the columns along the strip footing direction, while length (e-column) is perpendicular to the strip footing direction. Support moments and shear forces calculated in the beams are reduced by increasing values of this parameter.<\/span><\/span><\/span>
              <\/span><\/p>\n

              Axial Loads And Moments<\/span><\/b><\/span><\/u>
              <\/span><\/span><\/span><\/h5>\n
              Axial loads and moments found at the bottom nodes of foundation columns are listed here for the selected combination. <\/span><\/span><\/div>\n

              <\/span><\/div>\n
              <\/div>\n
              Orthogonal Span Width<\/span><\/span><\/u>
              <\/span><\/h5>\n

              If the strip footings are inserted as a 2D grid, then column axial loads must be shared between two footings in two directions. For this purpose, enter the distance of the column in orthogonal direction into the \u201c<\/span><\/span>Other Dir. Len.<\/span><\/span><\/i>\u201d field. This will reduced axial loads can be seen on the \u201cStrip Footing Results\u201d form. <\/span><\/span><\/span><\/p>\n

              Definition of Orthogonal Span Width.<\/span><\/span><\/span>
              <\/span><\/p>\n

              In the example sketch above: \u201c<\/span><\/span>d1<\/span><\/span><\/i>\u201d is the orthogonal span width for column <\/span><\/span>S1<\/span><\/span><\/i> when the strip footing is calculated along axis A.  Similarly, orthogonal span width for column S2 along axis B is \u201c<\/span><\/span>d1 + d2<\/span><\/span><\/i>\u201d. The value for column S3 along axis C is \u201c<\/span><\/span>d2 + 2*d3<\/span><\/span><\/i>\u201d, unlike others.<\/span><\/span><\/span><\/p>\n

              \"Notes\"<\/p>\n

              Why 2*d3? <\/span><\/span><\/b> <\/span><\/span><\/span>
              <\/span><\/span><\/p>\n

              Half of the value you entered as the other direction will be used to find the column area during the distribution of the column load between the two direction axes. <\/span><\/span><\/span>
              <\/span><\/span><\/div>\n
              Therefore, if there is cantilever beam in the other direction, you must include twice the length of the cantilever beam as the dimension of the other direction.<\/span><\/span><\/span><\/div>\n

              <\/span><\/div>\n

              <\/div>\n
              <\/div>\n
              <\/div>\n","protected":false},"excerpt":{"rendered":"

              For a strip footing to be defined under a series of columns\/walls, foundation beams must have been defined beforehand between the columns\/walls. ProtaStructure performs the…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","meta":{"_whitepaper_youtube_videos":"","_whitepaper_youtube_url":"","_whitepaper_youtube_thumbnail":"","footnotes":""},"categories":[182],"whitepaper_topic":[],"whitepaper_product":[],"whitepaper_type":[],"class_list":["post-33323","wiki","type-wiki","status-publish","hentry","category-foundation-modelling-and-design"],"yoast_head":"\nStrip Footing - Prota Software<\/title>\n<meta name=\"description\" content=\"For a strip footing to be defined under a series of columns\/walls, foundation beams must have been defined beforehand between the columns\/walls.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/protasoftware.com\/wiki\/strip-footing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Prota Software\" \/>\n<meta property=\"og:description\" content=\"For a strip footing to be defined under a series of columns\/walls, foundation beams must have been defined beforehand between the columns\/walls.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/protasoftware.com\/wiki\/strip-footing\/\" \/>\n<meta property=\"og:site_name\" content=\"Prota Software\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-19T12:37:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-8b01a885e2eb4f9b178fd97dd4ac3c3f.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Prota Software\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/protasoftware.com\\\/wiki\\\/strip-footing\\\/\",\"url\":\"https:\\\/\\\/protasoftware.com\\\/wiki\\\/strip-footing\\\/\",\"name\":\"Strip Footing - 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