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制作了2个箱型截面的钢筋混凝土悬臂构件模型,试验包括了模型构件屈服前的加载和屈服后的加载,其加载方案为保持轴力不变的情况下施加水平线荷载。试验中采用应变采集仪采集应变,采用读数显微镜观察裂缝,并用百分表测量构件的挠度。分析试验数据,得出各截面应力应变的分布;通过改变试件的轴压比,分析弹塑性阶段各截面剪力滞系数随轴压比的变化趋势,得出各截面剪力滞系数在混凝土开裂前、带裂缝工作阶段及钢筋屈服后随轴压比变化的规律;且研究表明,材料非线性对翼板与肋板交界处的剪力滞系数影响较大,与弹性阶段相比,箱形截面构件处于非线性阶段时轴压比对剪力滞效应的影响较小。
Two models of reinforced concrete cantilever members with box-section are fabricated. The tests include the pre-yielding and post-yielding loading of model members. The loading scheme is to apply horizontal line load while maintaining the same axial force. In the experiment, the strain gages were used to collect the strain, the cracks were observed with a reading microscope and the deflection of the members was measured with a dial indicator. By analyzing the experimental data, the distribution of stress and strain of each section is obtained. By changing the axial compression ratio of the specimen, the change trend of shear lag coefficient of each section of the elasto-plastic section with axial compression ratio is analyzed. Crack initiation and crack initiation, and the axial compression ratio changes after yielding. The results show that the material nonlinearity has a significant influence on the shear lag coefficient at the boundary between flange and rib. Compared with the elastic phase, The effect of axial compression ratio on shear lag effect is small when the cross-section member is in the non-linear phase.