高强约束混凝土框架柱基于位移的抗震设计

Displacement-Based Seismic Design of High-Strength Concrete Frame Columns with Confinements

根据收集的108根高强混凝土框架柱在固定轴向荷载和水平反复荷载作用下的试验结果,首先讨论了试验柱的屈服位移角、最大位移角、极限位移角和延性与剪跨比、轴压比、配箍特征值、保护层面积和核心混凝土面积比值及纵筋配筋率之间的关系;然后分析回归出试验柱的极限位移角与轴压比、配箍特征值及保护层面积和核心混凝土面积比值之间的关系式;接着建立了配箍特征值与轴压比和极限位移角之间的关系,并提出了配箍特征值的实用计算公式;最后,通过比较分析,给出了高强混凝土框架柱箍筋加密区的最小配箍特征值,并与现行规范(GB50010—2002)规定的框架柱箍筋加密区最小配箍特征值进行了分析比较.

Based on the testing results of 108 high-strength concrete columns under constant axial loading and horizontal cyclic loading, a discussion is held on the relationship between the drift ratio at yield, the maximum displacement drift, the limiting displacement drift, the ductility ratio of testing columns and shear span-to-depth ratio, axial compression ratio, confining reinforcement characteristic values, the ratio of cover area to confined core area as well as longitudinal reinforcement ratio; and then the relationship is analytically regressed between limiting displacement drifts and axial compression ratio,confining reinforcement characteristic values and the ratio of cover area to confined core area; subsequently the relationship is established between confining reinforcement characteristic values and axial compression ratio, the limiting displacement drift, and the practical formula used to calculate confining reinforcement characteristic values; in the end this paper presents the minimum confining reinforcement characteristic values in the dense hoop regions of high-strength concrete columns on the basis of a comparison with that in the design code （GB 50010-2002）.