KB 001655 | Superposition of modal responses in the response spectrum method by means of the equivalent linear combination


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The response spectrum analysis is one of the most frequently used design methods in the case of an earthquake. This method has many advantages. The most significant is the simplification: It simplifies the complexity of an earthquake so far that a design can be performed with reasonable effort. The disadvantage of this method is that a lot of information is lost due to this simplification. One way to alleviate this disadvantage is to use the equivalent linear combination when combining the modal responses. This will be explained in more detail in this article with an example.


Dlubal Knowledge Base Dynamic analysis Earthquake Response spectrum Combination Modal response Dlubal KB Knowledge Base Technical Contribution


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  • Updated 24 October 2020

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