核心高强混凝土柱界限轴压比研究

Research on boundary axial compression ratio of concrete columns with high strength concrete core

为研究使核心高强混凝土柱发生延性较好的大偏心受压破坏所需要的界限轴压比,采用matlab语言编制了核心高强混凝土柱压弯构件非线性全过程分析程序。利用所编制的程序,对纵筋配筋率、核心混凝土强度、外围混凝土强度、配箍特征值等因素影响下的768种工况进行了分析,找出了各工况下核心高强混凝土柱大、小偏心受压破坏界限点所对应的轴压比。通过对768个界限轴压比的统计分析,确定了核心高强混凝土柱的试验界限轴压比和设计界限轴压比,可供此类柱试验和设计时参考。

In order to study concrete columns with high strength concrete core （HSCC columns） collapse in tension failure when subjected to eccentrically loading, the boundary axial compression ratio which is the boundary to separate the tension failure and the compression failure under eccentrically loading was researched. A computer program was developed firstly to investigate the nonlinear behavior of HSCC columns which subjected to axial compression and bending. Then 768 HSCC columns with different parameters of longitudinal reinforcement ratio, core concrete strength, outer concrete strength and lateral confinement eigenvalue were analyzed by the computer program, and found out the boundary axial compression ratio of each case. According to the statistics to 768 boundary axial compression ratio, the finally boundary axial compression ratio for test and designing were provided, which could be served as reference for the HSCC columns in test and in design.