Dynamic response analysis of steel frame with a sudden removal first floor column

摘要

The dynamic analysis of damaged steel frame structure with removal column utilizing alternative load path method was conducted in the FE software Opensees with the consideration of three random parameters including material yield strength, dead load and live load. Due the enhancement of material's yield strength under the high strain rate condition, steel material property was gained through the cowper-symonds model. Taken the sample steel plane frames of 7-degree anti-earthquake defensive area the example, loading re-distribution was discussed after the scenarios of middle or side column removal in the first floor. In the final the dynamic yield strength amplification coefficient and the bending moment ratio of beam-ends among the direct influenced region were statistics and researched.