SEISMIC STRENGTHENING CONSTRUCTION METHOD FOR EXISTING BUILDING

摘要

PROBLEM TO BE SOLVED: To provide a seismic strengthening construction method for an existing building with reinforced concrete or steel-framed reinforced concrete.;SOLUTION: An energy absorption steel member 10 in a long and thin shape made of low yield strength steel or ultra-low yield strength steel, which absorbs earthquake energy as it plastically deforms and has a certain cross section at the middle point in the longitudinal direction, is installed at a beam end part. In this state, a first end of the energy absorption steel member is jointed at a position on a column close to a column-beam joint portion, and the energy absorption steel member is extended along the beam end part in the longitudinal direction of a beam 14, and a second end part of the energy absorption steel member 10 is jointed at a position on the beam end part separated from the column-beam joint portion. The energy absorption steel member is made to plastically expand and contract as it receives a tensile load or a compression load in the longitudinal direction when an earthquake occurs and the column-beam joint portion and/or the beam end part deform. Furthermore, to prevent the energy absorption steel member from buckling, a stiffening member 30 for restraining buckling, which stiffens the energy absorption steel member by surrounding the middle point in the longitudinal direction of the energy absorption steel member, is provided at the beam end part.;COPYRIGHT: (C)2013,JPO&INPIT