论文部分内容阅读
为研究复合受扭型钢混凝土柱的抗震性能,进行了11个复合受扭型钢混凝土构件和1个作为对比的复合受扭钢筋混凝土构件的拟静力试验,研究配钢形式、轴压比、扭弯比、混凝土强度、配钢率和配箍率等对构件抗震性能的影响。结果表明:复合受扭型钢混凝土构件受力全过程经历未裂阶段、带裂缝工作阶段和破坏阶段;构件的破坏形态有扭型破坏和弯扭型破坏两种;轴压比为0.1较其为0.2的构件、扭弯比为0.5较其为1.0的构件、以及箍筋间距75 mm较其为100 mm的构件的滞回曲线更为饱满;11个型钢混凝土构件转角延性系数的平均值为5.12,其中6个H型钢混凝土构件转角延性系数的平均值为4.17,5个十字型钢混凝土构件转角延性系数的平均值为6.27,钢筋混凝土对比构件的转角延性系数为3.86;随着加载位移的加大,构件的承载力衰减越来越大;相对刚度的退化经历弹性退化、屈服退化和破坏退化阶段;等效阻尼比随着扭率的增大而增大,两者大致成线性关系。
In order to study the seismic behavior of composite torsionally-deformed concrete columns, 11 pseudo-static tests of 11 composite torsion-type reinforced concrete members and 1 composite torsion-reinforced concrete member were carried out. The effects of steel distribution form, axial compression ratio, twist Bending ratio, concrete strength, steel ratio and stirrup ratio and other components of the seismic performance. The results show that the whole torsional strength of the composite torsion-strengthened concrete members undergoes the uncracked stage, the fracture working stage and the failure stage. The failure modes of the members are torsional-type failure and torsional-torsional-type failure. When the axial compression ratio is 0.1, 0.2, the twist ratio of 0.5 is 1.0, and the hysteresis curve of the member with stirrup spacing of 75 mm is 100 mm. The average value of the corner ductility of 11 steel reinforced concrete members is 5.12 , Of which the average value of the angular ductility of six H-section steel members was 4.17. The average value of the angular ductility of the five cross-shaped steel members was 6.27 and that of the reinforced concrete members was 3.86. With the increase of the loading displacements , The bearing capacity of the member decays more and more; the degradation of relative stiffness undergoes the stages of elastic degradation, yield degradation and failure degradation; and the equivalent damping ratio increases with the increase of the torsional rate, and the two are approximately linear.