{"id":31908,"date":"2026-04-27T11:56:37","date_gmt":"2026-04-27T11:56:37","guid":{"rendered":"https:\/\/protasoftware.com\/technical-manuals\/pre-analysis\/seismic-analysis-to-india-nbc-2016\/"},"modified":"2026-06-19T12:37:56","modified_gmt":"2026-06-19T12:37:56","slug":"seismic-analysis-to-india-nbc-2016","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/wiki\/seismic-analysis-to-india-nbc-2016\/","title":{"rendered":"Seismic Analysis To India Nbc 2016"},"content":{"rendered":"
Prota<\/span><\/b>Structure can calculate seismic loads in accordance with India (IS 1893-2016) seismic code, which covers the key parts of IS codes. <\/span><\/span>
<\/span><\/div>\n
    \n
  1. Click on <\/span>Settings Center <\/span><\/b>> <\/span>Code<\/span><\/a> section will be shown > Pick <\/span>Earthquake Code  <\/span><\/b> <\/span>
    <\/span><\/span><\/li>\n
  2. Click <\/span><\/span>Seismic Parameter <\/span><\/b>to access the Seismic Parameters & Settings<\/span><\/span><\/li>\n<\/ol>\n

    <\/span><\/span><\/div>\n
    \n
    <\/div>\n
    <\/p>\n
    \"Info\"<\/div>\n
    Click the i  <\/span><\/i><\/b>icon for more information and guidance on the parameter.<\/div>\n
    Please ensure to also read this article<\/span> <\/span>Seismic Load – Basic Guide<\/span><\/a>. <\/span> <\/span><\/div>\n

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

    \n

    Parameters<\/span>
    <\/h1>\n
    The following are explanation of key inputs in \u201cParameters<\/b>\u201d tab :<\/span><\/div>\n
      \n
    1. Spectrum Angle<\/b> : Is the angle of the applied seismic forces with respect to the orientation of the structure on plan view; measured anti-clockwise from global horizontal.  <\/span>For example, if a rectangular building is modelled at a rotated angle, then the spectrum angle should be changed accordingly.<\/span><\/li>\n<\/ol>\n
      \n
        \n
      1. Town :  <\/b>User to select town<\/span><\/li>\n
      2. Seismic Zone & Seismic Zone Factor, Z <\/b>:  Values will auto update according to town selected<\/span><\/span><\/li>\n<\/ol>\n
          \n
        1. Importance Factor, I <\/b>:  User to select<\/span><\/li>\n<\/ol>\n
            \n
          1. Structural System Type<\/b> : User to select for each Direction 1(X) & 2(Y).<\/span><\/li>\n<\/ol>\n
              \n
            1. Response Reduction Factor, R<\/b> : Value automatically fetched according to selected Structural System Type
              <\/b><\/span><\/li>\n
            2. Use site-specific spectrum : <\/b>User to decide <\/span><\/li>\n
            3. Ground Type (Soil Parameters)<\/b> : User to select and all other fields To<\/b>, Ts, A<\/b>, & S<\/b>a<\/b> will be updated.<\/span><\/li>\n<\/ol>\n
              <\/div>\n<\/div>\n<\/div>\n
              \n

              Analysis
              <\/span><\/h1>\n
              The following are explanation of key inputs in \u201c<\/span>Analysis<\/span><\/b>\u201d tab :<\/span><\/span>
              <\/span><\/div>\n
                \n
              1. Apply Accidental Eccentricity (5%)<\/span><\/b> :<\/span>  <\/span><\/span>Check to apply<\/span><\/span>
                <\/span><\/li>\n<\/ol>\n
                  \n
                1. Damping Ratio<\/span><\/b> : User input according to building type. Generally, 0.05 (5%) for concrete structure and 0.02 (2%) for steel structure. <\/span><\/li>\n<\/ol>\n
                    \n
                  1. Number of Horizontal Modes <\/span><\/b> :  User input (recommended value = 15<\/b>)<\/span>
                    <\/li>\n
                  2. Number of Vertical Modes <\/span><\/b> :  User input (recommended value = 15<\/b>)<\/span><\/li>\n<\/ol>\n
                    \n
                    \n
                    <\/p>\n
                    \"Notes\"<\/div>\n
                    ProtaStructure will check the number of modes automatically & issue a warning during analysis if cumulative mass participation is not satisfied.<\/span><\/div>\n

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

                      \n
                    1. Use user-defined periods in equivalent static analysis <\/b>: Check to apply & input Period in X & Y direction<\/font><\/li>\n
                    2. Structural Usage or Type<\/span><\/b> :<\/span>  <\/span><\/span><\/span>Static field that appears on the reports. User can write anything here.<\/span><\/li>\n<\/ol>\n

                      Structural Irregularities
                      <\/span><\/h1>\n
                      The following are the list of irregularities checks in \u201c<\/span>Structural Irregularities<\/span><\/b>\u201d tab :<\/span><\/span>
                      <\/span><\/div>\n

                      Irregularities in Plan<\/span><\/span><\/u><\/b>
                      <\/span><\/h2>\n
                        \n
                      1. Torsional Irregularity<\/span><\/b> : Automatically calculated<\/span><\/span>
                        <\/span><\/li>\n<\/ol>\n
                          \n
                        1. Existence if Re-entrant Corners <\/span><\/b>: User to evaluate & check if exist<\/span><\/span>
                          <\/span><\/li>\n<\/ol>\n
                            \n
                          1. Diaphragm Discontinuity<\/span><\/b> : User to evaluate & check if exist<\/span><\/span>
                            <\/span><\/li>\n<\/ol>\n
                            \n
                            Floor meshing with flexible diaphragm option can be used to model buildings with diaphragm discontinuity. Refer here <\/span>: <\/span>Slab Model<\/a><\/span><\/div>\n<\/div>\n
                              \n
                            1. Non parallel Axes of Structural Elements <\/span><\/b>:<\/span>  <\/span><\/span>User to evaluate & check if exist<\/span><\/span>
                              <\/span><\/li>\n<\/ol>\n

                              Irregularities in Elevation<\/span><\/span><\/u><\/b>
                              <\/span><\/h2>\n
                                \n
                              1. Stiffness Irregularity<\/span><\/b> : Automatically Detected<\/span><\/span><\/li>\n<\/ol>\n
                                  \n
                                1. Nonuniform Mass Distribution<\/span><\/b> : Automatically Detected<\/span><\/span>
                                  <\/span><\/li>\n<\/ol>\n
                                    \n
                                  1. Lateral Strength Discontinuity \u2013 Weak Storey<\/span><\/b> : Automatically Detected<\/span><\/span>
                                    <\/span><\/li>\n<\/ol>\n
                                      \n
                                    1. Discontinuous Vertical Load Resisting Elements<\/span><\/b> : User to evaluate & check if exist<\/span><\/span>
                                      <\/span><\/li>\n<\/ol>\n
                                        \n
                                      1. Building with Setbacks<\/span><\/b> : User to evaluate & check if exist<\/span><\/span>
                                        <\/span><\/li>\n<\/ol>\n
                                          \n
                                        1. Inplane Discontinuity in Lateral Force-Resisting Member<\/span><\/b> : <\/span><\/span>User to evaluate & check if exist<\/span><\/li>\n<\/ol>\n

                                          Settings
                                          <\/span><\/h1>\n

                                          The following are explanation of key inputs in \u201c<\/span>Settings<\/span><\/b>\u201d tab :<\/span><\/span>
                                          <\/span><\/p>\n

                                          Post Analysis Checks<\/span><\/u><\/b>
                                          <\/span><\/h2>\n
                                            \n
                                          1. \n
                                            Check Relative InterStorey Drift :<\/span><\/b>  <\/span><\/span>Tick to perform check. Default drift limit is shown in the next input<\/span><\/span>
                                            <\/span><\/div>\n<\/li>\n<\/ol>\n
                                              \n
                                            1. Use user-defined interstorey drift limit ratio<\/span><\/b> : Check to manually over-write the default ratio<\/span><\/span>
                                              <\/span><\/li>\n<\/ol>\n
                                                \n
                                              1. Check Building Height<\/span><\/b> :<\/span>  <\/span><\/span>Tick to perform check<\/span><\/span>
                                                <\/span><\/li>\n<\/ol>\n
                                                  \n
                                                1. Check Wall-Frame Interaction<\/span><\/b> : User to decide<\/span><\/span>
                                                  <\/span><\/li>\n<\/ol>\n
                                                    \n
                                                  1. Check Second Order Effect<\/b><\/span><\/span><\/span><\/span> <\/b>: Tick to consider this effect using code based slenderness method<\/span><\/span><\/span><\/span><\/span><\/li>\n
                                                  2. Check Strength Irregularity (Weak Storey)<\/span><\/b> : Tick to check<\/span><\/li>\n
                                                  3. Check Stiffness Irregularity (Soft Storey )<\/span><\/b> : Tick to check<\/span><\/span>
                                                    <\/span><\/li>\n<\/ol>\n

                                                    Post Analysis Design Checks<\/span><\/u><\/b>
                                                    <\/span><\/h2>\n
                                                      \n
                                                    1. Check Strong Column \u2013 Weak Beam<\/span><\/b> :<\/span>  <\/span><\/span>User to decide. Columns & beams must be designed first before this check can be done.<\/span><\/span>
                                                      <\/span><\/li>\n<\/ol>\n
                                                        \n
                                                      1. Perform Joint Shear Check<\/span><\/b> :<\/span>  <\/span><\/span>User to decide.<\/span><\/span>
                                                        <\/span><\/li>\n<\/ol>\n
                                                          \n
                                                        1. Check Minimum Member Dimensions<\/span><\/b> : User to decide<\/span><\/span>
                                                          <\/span><\/li>\n<\/ol>\n
                                                            \n
                                                          1. Check Building Overturning<\/span><\/b> : User to decide<\/span><\/span><\/li>\n
                                                          2. Include Basements in overturning check <\/b>:  User to decide. Note : "<\/span>No. of Rigid Basement<\/b>"<\/span> is set in Edit Storey<\/a> menu. <\/span><\/span><\/span><\/li>\n<\/ol>\n

                                                            Response Spectrum Analysis<\/span><\/u><\/b>
                                                            <\/span><\/h2>\n
                                                              \n
                                                            1. Check Cumulative Effective Mass Participation<\/span><\/b> : <\/span> <\/span><\/span>Tick to check <\/span><\/span>
                                                              <\/span><\/li>\n<\/ol>\n
                                                                \n
                                                              1. Compare RSA Results with Equivalent Static Load<\/span><\/b> : Tick to consider <\/span><\/span>
                                                                <\/span><\/li>\n<\/ol>\n
                                                                  \n
                                                                1. Use User-Defined RSA Scale Factor<\/span><\/b> : Tick to manually over-ride automatically calculated factor
                                                                  <\/span><\/li>\n<\/ol>\n
                                                                    \n
                                                                  1. Results Sign Method for RSA :  <\/span><\/b>Use "Signs of dominant mode" or "Absolute Value".  Refer this article :<\/span> Results Sign Method for Response Spectrum Analysis<\/span><\/a> <\/span><\/li>\n<\/ol>\n

                                                                    Important Notes \/ Scope \/ Limitations :<\/span><\/span>
                                                                    <\/span><\/h1>\n
                                                                      \n
                                                                    1. Refer to \u201c<\/span>Post-analysis Checks Report<\/span><\/b>\u201d in \u201cReports\u201d tab for seismic analysis results & clause compliance.<\/span><\/span>
                                                                      <\/span><\/li>\n<\/ol>\n
                                                                        \n
                                                                      1. In Reports<\/b> tab, click on "Strong Column Check<\/b>s" & "Joint Shear Checks<\/b>" to perform the check and generate the report. <\/span><\/span><\/li>\n<\/ol>\n
                                                                          \n
                                                                        1. For \u201cJoint Shear Check\u201d the stirrups (links) are not considered.<\/span><\/span><\/li>\n
                                                                        2. Elastic and design spectra are automatically calculated.<\/span><\/span>
                                                                          <\/span><\/li>\n<\/ol>\n
                                                                            \n
                                                                          1. Maximum period of vibration checks is automatically made.<\/span>
                                                                            <\/span><\/span><\/li>\n<\/ol>\n
                                                                              \n
                                                                            1. Applicability of Equivalent Static Method is automatically checked.<\/span><\/span>
                                                                              <\/span><\/li>\n<\/ol>\n
                                                                                \n
                                                                              1. RSA results is automatically compared  with Equivalent Static Load<\/span> <\/span>(if option is ticked in <\/span>Settings<\/span><\/b> tab).<\/span><\/span><\/span>  A scaling factor will be automatically applied if required.<\/span>
                                                                                <\/span><\/li>\n<\/ol>\n
                                                                                  \n
                                                                                1. If there is a basement in the building, a two-stage approach is used to analyze the building. Basement and superstructure is analyzed separately in different load cases and the results are combined for the design. All these are done automatically (user input is not required).<\/span><\/span>
                                                                                  <\/span><\/li>\n<\/ol>\n
                                                                                    \n
                                                                                  1. Results for cracked and uncracked section analysis can be combined in same design combination.<\/span><\/span>
                                                                                    <\/span><\/li>\n<\/ol>\n
                                                                                      \n
                                                                                    1. CQC (Complete Quadratic Combination) method is used to combine modal responses. This method is superior and preferable, compared to SRSS since SRSS is a special case of CQC. <\/span><\/li>\n<\/ol>\n

                                                                                      \n

                                                                                      \n
                                                                                      <\/p>\n
                                                                                      \"Info\"\"Alert\"<\/div>\n
                                                                                      Please read this article<\/span> Seismic Load – Basic Guide<\/span><\/a> <\/span> on how to generate seismic load combination and check the results.<\/span><\/div>\n

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

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

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

                                                                                      ProtaStructure can calculate seismic loads in accordance with India (IS 1893-2016) seismic code, which covers the key parts of IS codes.  Click on Settings Center > Code section will…<\/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":[158],"whitepaper_topic":[],"whitepaper_product":[],"whitepaper_type":[],"class_list":["post-31908","wiki","type-wiki","status-publish","hentry","category-pre-analysis"],"yoast_head":"\nSeismic Analysis To India Nbc 2016 - Prota Software<\/title>\n<meta name=\"description\" content=\"ProtaStructure can calculate seismic loads in accordance with India (IS 1893-2016) seismic code, which covers the key parts of IS codes. Click\" \/>\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\/seismic-analysis-to-india-nbc-2016\/\" \/>\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=\"ProtaStructure can calculate seismic loads in accordance with India (IS 1893-2016) seismic code, which covers the key parts of IS codes. Click\" \/>\n<meta property=\"og:url\" content=\"https:\/\/protasoftware.com\/wiki\/seismic-analysis-to-india-nbc-2016\/\" \/>\n<meta property=\"og:site_name\" content=\"Prota Software\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-19T12:37:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/protasoftware.com\/wp-content\/uploads\/2026\/04\/prota-doc-f1edec4b53ba7f163a0e1b33d078bd52.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=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/protasoftware.com\\\/wiki\\\/seismic-analysis-to-india-nbc-2016\\\/\",\"url\":\"https:\\\/\\\/protasoftware.com\\\/wiki\\\/seismic-analysis-to-india-nbc-2016\\\/\",\"name\":\"Seismic Analysis To India Nbc 2016 - 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