Abstract
The goal was to evaluate the hysteresis performance of segmented
buckling resistant braces with low yield point steel LYP160, the
monotonic tensile and cyclic loading tests of LYP160 were conducted and
the corresponding laws have been obtained. According to the
load-displacement curves of the specimen, the low yield point steel was
characterized by good ductility and energy absorption ability. With the
consideration of Chaboche model on the materials, the cyclic loading was
simulated by ABAQUS and the cyclic hardening parameters of low yield
point steel were obtained. On this basis, the hysteretic properties of
buckling resistant braces under cyclic loads were simulated and
analyzed. After the analysis and comparison of buckling resistant braces
specimens with isotropic core plate and segmented variable section core
plate, it can be found that: When the buckling resistant braces with
isotropic core plate was loaded to L/100, the lateral deformation of BRB
would reach 17mm and the seriously squeezed would observe on lateral
constraint members. The buckling resistant braces would fail due to the
accumulation of deformation on lateral constraint members at both ends
of BRB. When the segmented buckling resistant braces was applied, the
core plate with variable section would yield first in the middle part,
other parts could still continue to consume energy due to the action of
the limit plate. It would avoid the phenomenon that other parts could
not continue to consume energy after the core plate failed at one point
first. Under the action of cyclic loads, the stiffness of the segmented
buckling resistant brace was constant and the better ability to consume
energy was reflected.