The Improvement Ways to Equivalent Linearization Method Based on the Difference between Results of Two Programs in Moderate Weak Site

Abstract

Equivalent linearization method is widely used in seismic response analysis. For Chinese engineers and researchers, LSSRLI-1 and SHAKE2000 are good choices for seismic safety evaluation. There is large difference between the results of these two programs in moderate weak sites, which directs ways to improve them. The average spectrum ratio increases with response spectrum peak value of inputting wave moving from long period to short period. The shear strain obtained by the programs exceeds shear capacity, which is impractical. In the type III site, the weak foundation exacerbates the error. In the way to improvement, frequency components of inputting wave should be taken into account, and a further study on computation method of strain should be launched. For security purposes, seismic safety evaluation for major projects needs multiple method for reliability, especially constructions sensitive to shear strain.