Vertical Earthquake Effects

Vertical Earthquake Effects

ProtaStructure can reflect the effects of vertical earthquake action in design by providing two methods:
  1. Approximate Static Approach 
  2. Modal Spectrum Analysis Method
In Approximate Static Approach, vertical vibration modes and a dedicated vertical spectrum are not considered. Instead, the result from gravity load case is multiplied by a fraction of horizontal spectral acceleration. In Modal Spectrum Analysis Method, on the other hand, vertical vibration modes of the structure are considered together with a vertical acceleration spectrum.

You can find all the details about these methods and how to apply them in ProtaStructure in the attached document. 

Notes
As a structural engineering software designed by structural engineers, ProtaStructure provides its users with comprehensive tools to ensure safe design. Since ProtaStructure 2025 onwards, significant new seismic capabilities have been introduced and the code-coverage of the software has become even more expansive. You can check out "ProtaStructure Suite 2025 New Features" document to explore all the essential new capabilities, and you can find the table of Supported Design Codes on our website. 



    • Related Articles

    • Modal Vertical Earthquake Analysis with the ProtaStructure 2025

      With its new features for advanced earthquake engineering applications, ProtaStructure now enables you to perform modal vertical earthquake analyses. ProtaStructure reflects the effects of vertical earthquake action to design by following two ...
    • Assessment & Performance-Based Design to Eurocode 8 Part 3

      Eurocode 8: Design of structures for earthquake resistance – Part 3: Assessment and retrofitting of buildings (EN 1998-3:2005) is a fundamental reference for the seismic evaluation of existing buildings. It provides a structured methodology for ...
    • Seismic Analysis to Philippines NSCP2015

      ProtaStructure can calculate seismic loads in accordance with Philippines (NSCP2015) seismic code, which is an adaptation of UBC97. Go to Building Analysis dialog > Pre-analysis tab : Click on Settings Center > Code section will be shown > Pick ...
    • Seismic Analysis to India IS 1893-2016

      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 be shown > Pick Earthquake Code Click Seismic Parameter to access ...
    • Assessment & PBD to ASCE/SEI 41

      ASCE/SEI 41-17—“Seismic Evaluation and Retrofit of Existing Buildings”—is the industry standard for assessing seismic performance in existing structures. Moreover, it uses performance-based design principles. Consequently, the standard defines a ...