{"id":31811,"date":"2026-04-27T11:53:39","date_gmt":"2026-04-27T11:53:39","guid":{"rendered":"https:\/\/protasoftware.com\/technical-manuals\/pre-analysis\/seismic-load-basic-guide\/"},"modified":"2026-06-19T12:37:57","modified_gmt":"2026-06-19T12:37:57","slug":"seismic-load-basic-guide","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/wiki\/seismic-load-basic-guide\/","title":{"rendered":"Seismic Load Basic Guide"},"content":{"rendered":"

General
<\/span><\/h1>\n
\n
    \n
  1. You will learn how to incorporate the basic seismic loading into your model.
    <\/span><\/li>\n
  2. You will know how to view & check the seismic mode shapes
    <\/span><\/li>\n<\/ol>\n
    It is very important that the user to refer the relevant earthquake code for detail explanations of the seismic analysis and design. 
    <\/span><\/div>\n
    This article uses EuroCode 8 for illustration. The procedure will be similar to other earthquake \/ seismic codes.
    <\/span><\/div>\n
    \"Notes\" <\/p>\n
    Please also read the country specific seismic article for further guidance :<\/span> <\/div>\n
    \n
      \n
    1. Seismic Analysis to EuroCode 8<\/a><\/li>\n
    2. Seismic Analysis to Philippines NSCP2015<\/a><\/li>\n
    3. Seismic Analysis to Indonesia SNI 1726 : 2019<\/a><\/li>\n
    4. Seismic Analysis to India IS1893-2016<\/a><\/li>\n<\/ol>\n<\/div>\n

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

      \n
      \"Idea\"<\/p>\n
      You may also refer to below design guide and video to understand about seismic isolation.<\/span><\/div>\n
        \n
      1. Base Isolation<\/a><\/li>\n
      2. Introduction to Seismic Isolation<\/a> (Video)<\/span><\/li>\n<\/ol>\n

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

        Procedures<\/span><\/span>
        <\/span><\/h1>\n

        Select a Design Code
        <\/span><\/h2>\n
        Select an Earthquake Code: <\/span> Building Setout tab ><\/span><\/b>  <\/span><\/span>Settings Center <\/span><\/span><\/b>>  <\/span><\/span>Codes<\/span><\/span><\/b> <\/span>tab<\/span><\/i> > Choose an Earthquake code from the list.<\/span><\/span><\/div>\n
        <\/div>\n
        <\/div>\n
        <\/div>\n
        \n

        Define Seismic Load Cases and Combinations
        <\/span><\/h2>\n
        With reference to the figure below :  <\/span><\/span><\/div>\n
        <\/div>\n
        <\/p>\n
        <\/div>\n

        <\/span><\/i><\/b><\/div>\n


        <\/font><\/div>\n
        1. Go to <\/span><\/span>Loading<\/span><\/span><\/b> tab >pick<\/span><\/span> <\/span><\/span>Load Cases and Combinations  
        <\/span><\/span><\/b><\/i><\/div>\n
        2. The load Combination Editor will appear (as above) <\/span><\/span>
        <\/span><\/font><\/div>\n
        3. Pick <\/span><\/span>Loading Generator > Automatic Loading Editor <\/span><\/span><\/b>will appear<\/span><\/span>
        <\/span><\/span><\/b><\/font><\/div>\n
        4. Go to<\/span><\/span><\/font> <\/span><\/span>Horizontal Load Combinations <\/span><\/span><\/b><\/i>tab<\/span><\/span> <\/span><\/span><\/b><\/i>> Check the  <\/span><\/span>Seismic Loading<\/span><\/span><\/i><\/b> > select  <\/span><\/span>Equivalent Static load<\/span><\/span><\/i><\/b>  or <\/span><\/span>Modal Response Spectrum.<\/span><\/span><\/i><\/b><\/div>\n<\/div>\n<\/div>\n<\/div>\n
        \n
        \"Idea\"<\/p>\n
        Guidance with reference to EuroCode 8 :<\/span><\/span><\/span><\/div>\n
          \n
        1. "Equivalent Static Load"<\/span><\/span><\/i><\/b> or <\/span><\/span><\/i>"Lateral Force Analysis Method"<\/span><\/span><\/i>  <\/span><\/span><\/b>is only applicable for buildings with fundamental periods smaller than 2.0s & buildings that are regular in elevation (may differ country specific code or National Annex).
          <\/span><\/span><\/li>\n
        2. "Modal Response Spectrum" <\/span><\/span><\/i><\/b>is applicable to all structure types & is a more accurate assessment of seismic forces. As such we strongly recommend user use this method for all buildings.<\/span><\/span><\/li>\n<\/ol>\n

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

          Update the Seismic Design Parameters
          <\/span><\/h2>\n
          Go to <\/span>Loading<\/span><\/b> tab > pick <\/span>Seismic Parameters <\/span><\/b>
          <\/span><\/span><\/div>\n

          <\/span><\/span><\/div>\n
          You can define the seismic parameters by going through all tabs in Seismic Parameters dialog  : <\/span><\/span>Parameters, Analysis, Structural Irregularities or Settings.<\/span><\/span><\/i><\/b><\/div>\n
          <\/div>\n
          <\/div>\n
          <\/i><\/b><\/div>\n
          Example, you can can adjust the number of vibration modes in 2 directions in the <\/span><\/span>Analysis Tab<\/span><\/span><\/b><\/i><\/div>\n
          <\/div>\n
          <\/div>\n
          <\/i><\/b> <\/div>\n
          \n
          \"Notes\" <\/p>\n
          Increase the number of vibration mode to achieve cumulative mass participation of 90% (as required by most seismic code). Recommended value is <\/span>15<\/span><\/b>. 
          <\/span><\/div>\n
          If the criteria is not satisfied, there will be appropriate warning prompt & recorded in the  <\/span>Post Analysis Checks Report<\/span><\/b>.
          <\/span><\/i><\/div>\n
          Refer to the country specific seismic design guides for more details as given above at the start of article. 
          <\/span><\/div>\n

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


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

          User-defined Periods in Equivalent Static Load (EQS) Analysis<\/span>
          <\/span><\/h2>\n
          <\/p>\n

          To determine the natural modes of vibration, ProtaStructure automatically performs a 3D eigenvalue analysis. After the vibration modes are detected, they are sorted with respect to their mass participation in three degrees of freedom, namely, Translation X, Translation Y and Rotation Z. The dominant modes in X and Y direction are selected as candidate modes to be used in equivalent static earthquake load method.<\/span><\/span><\/p>\n

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

          However, the period of vibration from these modes can not be directly used in EQS method. Seismic codes always put an upper limit to these values by empirical formulas. The most conditions are: <\/span><\/span>
          <\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n
          \n
          \n
          1. T<\/span><\/span>eigen <\/span><\/span>\u2264 Rayleigh formula<\/span><\/div>\n
          2. T<\/span>eigen <\/span><\/span>\u2264 C<\/span><\/span>u<\/span><\/span>.C<\/span><\/span>t<\/span><\/span>.h<\/span><\/span>nx<\/span><\/div>\n
          <\/span>3. T<\/span><\/span>eigen <\/span><\/span>\u2264 0.1N<\/span><\/span><\/div>\n<\/div>\n<\/blockquote>\n
          ProtaStructure automatically checks these conditions and their variation depending on the selected seismic code.<\/span><\/div>\n
          \n
          <\/p>\n
          Users are allowed to directly impose user-defined periods to be used EQS analysis. To enter user-defined periods:<\/span><\/div>\n

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

          \n
          \n
          \n
          1. Navigate to \u201c<\/span>Seismic Parameters > Analysis<\/span><\/b>\u201d tab.<\/span>
          <\/span><\/div>\n<\/div>\n<\/div>\n
          \n
          \n
          2. Check \u201c<\/span>Use User-Defined Periods in Equivalent Static Analysis<\/span><\/b>\u201d option.<\/span>
          <\/span><\/div>\n<\/div>\n<\/div>\n
          \n
          \n
          3. Enter period values in <\/span>X<\/span><\/b> and<\/span> Y <\/span><\/b>direction.<\/span><\/span><\/div>\n
          4. Exit the window by clicking <\/span>OK <\/span><\/b>button.<\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/blockquote>\n
          \n
          \n
          <\/span>
          <\/span>
          <\/div>\n
          \n
          \"Notes\"<\/p>\n
          The user-defined periods will be directly used in equivalent static base shear calculation without applying any upper limit restrictions<\/span>.<\/div>\n

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

          Define the Live Load \/ Simultaneous Presence Factor<\/span><\/span><\/span>
          <\/span><\/h2>\n
          You can assign the Live Load or Simultaneous factor in Building Setout <\/b>tab > Storey Operations<\/b> > Edit Storey <\/a>menu. 
          <\/span><\/div>\n

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

          <\/span><\/div>\n
          <\/div>\n
          Live load factor <\/span> <\/span><\/i><\/b>affects seismic weight calculation of each floor :
          <\/span><\/div>\n<\/div>\n<\/div>\n
          \n
          \n
          \n
          Seismic Weight, W = [Dead load] + <\/span>.[Live Load]<\/span><\/span><\/b><\/i>
          <\/span><\/div>\n<\/div>\n<\/div>\n<\/blockquote>\n
          \n
          \n

          Define No. of Rigid Basement<\/span><\/span>
          <\/span><\/h2>\n
          If basements are also modelled, it can be excluded from the mass irregularity checks. The number of basements can be specified in the \u201c<\/span>Edit Storey<\/span><\/i><\/b>\u201d dialog.
          <\/span><\/div>\n

          <\/span><\/div>\n
          In the example below, Storey 1 is actually a basement. Hence, we set No. of Rigid Basement<\/b> is set to 1. 
          <\/b><\/span><\/div>\n

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

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

          <\/span><\/div>\n
          After running Building Analysis, access the Post Analysis Check Report for the seismic report and locate section "Interstorey Mass Irregularity Check<\/span>".  <\/span>Storey 1 is correctly excluded from this check<\/span><\/span> as below.<\/span>  <\/span><\/div>\n
          <\/div>\n
          <\/div>\n<\/div>\n

          Building Analysis
          <\/span><\/h2>\n
          1. Go to <\/span>Building Analysis<\/span><\/i> <\/span><\/b>> <\/span>Model Options<\/span><\/i><\/b> <\/span> <\/span><\/i>> <\/span>Material Effective Stiffness Factors<\/span><\/i><\/b><\/div>\n
          <\/div>\n
          <\/div>\n
          <\/div>\n
          2. Review & change the stiffness factors in accordance to the code of practice.  Seismic load cases will always consider cracked section properties.  <\/span>
          <\/span><\/div>\n
          3. Start the Analysis. A summary report will appear upon completion of analysis.  <\/span>Details can be found in the<\/span><\/span> <\/span>Post Analysis Checks Report. <\/span><\/i><\/b> <\/div>\n
          <\/div>\n
          <\/div>\n

          <\/span><\/span><\/div>\n
          4. Click <\/span><\/span>OK<\/span><\/span><\/b> to continue. <\/span>
          <\/span><\/div>\n

          Post-analysis : Analytical Model<\/span><\/span><\/span>
          <\/span><\/h2>\n
          The Analytical Model<\/a> view can be created & opened, upon completion of Building Analysis. <\/span><\/div>\n
          Go to <\/span>Analysis <\/span><\/b>tab >  <\/span><\/span>Analytical Model<\/span><\/b> <\/span> > Building Analysis Model<\/b> (as below)
          <\/span><\/span><\/div>\n

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

          <\/span><\/span><\/div>\n
          Analytical Model view will be created as shown below for example quick start guide model. 
          <\/span><\/div>\n

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

          <\/span><\/div>\n<\/div>\n
          <\/div>\n
            \n
          1. In the Results<\/b> tab, ensure Displacement <\/b>is activated. <\/span><\/span><\/li>\n
          2. Click <\/span><\/span>Animation<\/span><\/span><\/b> to clearly visualize the vibration mode of the building.
            <\/span><\/span><\/li>\n
          3. Click <\/span><\/span>"<\/span><\/span><\/b> <\/span><\/span>+ Increase Scale<\/span><\/span><\/i><\/b> <\/span><\/span>" or "<\/span><\/span>Auto Scale"<\/span><\/span><\/i><\/b>  if the vibration is not visually significant.
            <\/span><\/span><\/li>\n
          4. Select Model Shapes<\/b> in the right pane. 
            <\/span><\/span><\/li>\n<\/ol>\n
            The below shows the animation of the first 3 modes <\/span><\/span>: <\/span>
            <\/font><\/div>\n

            <\/font><\/div>\n
            \n

            <\/div>\n<\/div>\n
            <\/div>\n
            \n
            \"Idea\"<\/p>\n
            Some guidelines & notes<\/span><\/span><\/b> :<\/span><\/span><\/div>\n
              \n
            1. The first 3 modes should be <\/span><\/span>"X-Direction"<\/span><\/span><\/b> or <\/span><\/span>"Y-Direction"<\/span><\/span><\/b> or <\/span><\/span>"Torsion"<\/span><\/span><\/b> for a stable model.
              <\/span><\/span><\/li>\n
            2. If you find the first few modes of vibration not as above, there is likely local instability (e.g. due to wrong modelling, too many hinges applied or isolated member not restrained properly) 
              <\/span><\/span><\/li>\n
            3. Observe carefully the animation of the building to determine the location of instability and rectify the model to suit.
              <\/span><\/span><\/li>\n
            4. For guidance analytical model verification, watch this e-learning video : <\/span><\/span>15 Post Analysis, Analytical Model<\/span><\/span><\/a><\/li>\n<\/ol>\n

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

              Reports
              <\/span><\/h1>\n
              The results of the seismic analysis can be found in  <\/span><\/span>Building Analysis<\/span><\/span><\/i><\/b> dialog > <\/span><\/span>Reports tab<\/span><\/span><\/i><\/b> <\/span>
              <\/span><\/span><\/div>\n
                \n
              1. Post Analysis Checks Report<\/span><\/span><\/b> : contain details of seismic analysis results & clause compliance<\/span>
                <\/span><\/span><\/li>\n
              2. Strong Column Checks <\/span><\/span><\/b>: only be created for medium or high ductility analysis<\/span>
                <\/span><\/span><\/li>\n
              3. Joint Shear Checks<\/span><\/span><\/b> : only created for medium or high ductility analysis<\/span><\/span><\/li>\n
              4. Eigenvalue results report <\/span><\/span><\/b>:  Contains information of natural frequency & period<\/span>
                <\/span><\/span><\/li>\n<\/ol>\n
                Alternatively, all reports can be accessed from <\/span><\/span>Drawings & Reports<\/span><\/span><\/b> tab > <\/span><\/span>Reports<\/span><\/span><\/b> drop down list. <\/span><\/span><\/div>\n
                <\/div>\n<\/div>\n
                <\/p>\n
                <\/div>\n

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

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

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