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Analysis of seismic response of common ducts and internal pipes is presented here. A common duct is modeled as a uniform beam with a rectangular cross section and internal pipe as a rumped mass-spring system. First, based on the soil-common duct interaction to seismic waves, the axial and lateral responses of the common duct are analyzed. Then the internal pipe's response is investigated depending on the response of the common duct. Numerical computations are done mainly on the strains of the common duct and internal pipes. Results show that the common duct reduces the deformation of internal pipes, and the strain of the common duct concentrates at both ends in the case of large difference of motion between both ends structures and ground.

SEISMIC RESPONSE ANALYSIS OF A COMMON DUCT AND INTERNAL PIPES