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2014•Unpublished venueRequires access

Seismic Retrofit Technology

Kevin I. Keady, Fadel Alameddine, Thomas E. Sardo

Open publisher page 3 citations

Abstract

For ordinary bridges, a dynamic modal response spectrum analysis is usually performed under the design earthquake. e modal responses are combined using the complete quadratic combination (CQC) method. e resulting orthogonal responses are then combined using the “30 Percent Rule.” Two cases are considered when combining orthogonal seismic forces. Case 1 is the sum of forces due to transverse loading plus 30% of forces due to longitudinal loading. Case 2 is the sum of forces due to longitudinal loading plus 30% of forces due to transverse loading.

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What this paper is about

For ordinary bridges, a dynamic modal response spectrum analysis is usually performed under the design earthquake. e modal responses are combined using the complete quadratic combination (CQC) method. e resulting orthogonal responses are then combined using the “30 Percent Rule.” Two cases are considered when combining orthogonal seismic forces. Case 1 is the sum of forces due to transverse loading plus 30% of forces due to longitudinal loading. Case 2 is the sum of forces due to longitudinal loading plus 30% of forces due to transverse loading.

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Available abstract

For ordinary bridges, a dynamic modal response spectrum analysis is usually performed under the design earthquake. e modal responses are combined using the complete quadratic combination (CQC) method. e resulting orthogonal responses are then combined using the “30 Percent Rule.” Two cases are considered when combining orthogonal seismic forces. Case 1 is the sum of forces due to transverse loading plus 30% of forces due to longitudinal loading. Case 2 is the sum of forces due to longitudinal loading plus 30% of forces due to transverse loading.

Key concepts: Geology, Computer science

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