11.17 - Response Spectrum Method for MDOF Systems
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Practice Questions
Test your understanding with targeted questions
What is the first step you take when applying the Response Spectrum Method?
💡 Hint: Think about breaking down motion into simpler components.
What does SRSS stand for in the context of combining modal responses?
💡 Hint: It includes summing squares and then taking a square root.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the main purpose of the Response Spectrum Method?
💡 Hint: Remember the focus of this method relates to seismic activity.
True or False: The Complete Quadratic Combination method is only used for widely spaced modal frequencies.
💡 Hint: Reflect on the characteristics of ERSS and CQC methods.
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Challenge Problems
Push your limits with advanced challenges
Given a building with two significant modes, the first has a frequency of 2 Hz and the second has 4 Hz. The response spectrum shows peak displacements of 3 cm and 1.5 cm, respectively. Calculate the combined peak response using the SRSS method.
💡 Hint: Think about how to calculate the square of each displacement and sum them before taking the square root.
An engineer assesses a complex bridge using both SRSS and CQC methods for modal response combinations. She finds significant differences in results. Explain the potential impact of using the wrong method.
💡 Hint: Consider how correlations between modes can affect overall response estimations.
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