核心高强混凝土柱荷载-位移恢复力模型

Restoring-force model of load versus displacement for concrete columns with high strength core

摘要:

为建立核心高强混凝土柱的恢复力模型,在核心高强混凝土柱水平低周反复荷载试验研究的基础上,对112种工况下的核心高强混凝土柱进行计算分析和数值回归.提出以轴压比、核心高强混凝土面积比、剪跨比为参数的恢复力模型骨架曲线特征点计算公式,恢复力模型的滞回规则及卸载刚度的计算公式.按所提出的恢复力模型对试验柱进行计算,所得计算曲线与实测的滞回曲线吻合良好,说明所提出的恢复力模型具有较好的精确性,能够较好地模拟和反映构件的实际抗震性能.

Abstract:

In order to establish a restoring-force model for concrete columns with high strength core,based on the low cyclic loading tests.112 concrete columns with high strength core were calculated and the results were regressed.The expressions for characteristic nodes of the skeleton curve were given in terms of the axial compression ratio,the area ratio of core high strength concrete and the shear-span ratio.In addition,the hysteretic rule of the restoring-force model and the expression for unloading stiffness were presented.The numerical results based on the restoring-force model given in this paper are in good agreement with experimental results,which shows that the restoring-force model presented in this paper can accurately simulate and reflect the seismic behaviors of concrete columns with high strength core.