Seismic Analysis of Pipelines with Interference Response Spectra.

摘要

Lifeline structures (bridges,tunnels,highways,and pipelines) that extend over long horizontal distances are affected by the non-coherent components of ground shaking. The response of interest is the relative displacement of adjacent points on the structure,instead of displacement relative to the ground. For this reason,the seismic analysis of lifelines requires techniques which are different from those used in the analysis of buildings. In this paper,the concept of the Interference Response Spectrum (IR Spectrum) is discussed. The IR Spectrum presents quantitatively and in a unified form the effects of the non-coherent free field on the dynamic response of lifeline structures. Derivations,properties and examples of IR spectra are given. Further investigations for using IR Spectrum in seismic analysis are suggested.