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Understanding Response Spectrum Mode Combination Methods Using Ansys Mechanical — Lesson 2

In a response spectrum analysis, we first obtain the individual modal responses to an input response spectrum. Then, different mode combination methods are used to approximate the maximum response of the structure. In Ansys Mechanical, three types of mode combination methods are available, square root of the sum of squares (SRSS), complete quadratic combination (CQC)​ , and Rosenblueth (ROSE). The SRSS method does not account for the modal coupling between different modes, whereas the CQC and ROSE methods account for the interaction of modes that are close to each other.  In this video lesson, we will explore how mode combination methods are specified, and how different methods affect the results. // INTERESTED IN MORE? Visit Ansys Innovation Courses for free courses, including videos, handouts, simulation examples with starting files, homework problems and quizzes. Visit today → https://bit.ly/3Eo8esU // DOWNLOAD FREE ANSYS SOFTWARE Ansys offers free student product downloads for homework, capstone projects, student competitions, online learning and more! Download today → https://bit.ly/32eEcuR // QUESTIONS ABOUT THIS VIDEO OR USING ANSYS? Get help from Ansys experts and peers through the Ansys Learning Forum. Search for answers to common questions, browse discussion categories or ask your own question. Visit today → https://bit.ly/3qsytK2 // STAY IN THE LOOP Follow our Ansys Academic LinkedIn showcase page for updates on learning resources, events, job opportunities, cutting-edge simulation content and more! Follow today → https://bit.ly/3Bbaaow 0:00 - Intro 02:12 - General equation of mode combination methods 02:29 - The coupling coefficient 04:28 - Square root of the sum of the squares (SRSS) method 05:07 - Rosenblueth (ROSE) method  06:18 - Complete quadratic combination (CQC) method  09:40 - How to specify the mode combination method in Ansys Mechanical