偏压荷载下钢管混凝土柱的抗扭性能试验研究

发布时间：2018-05-12 22:22

本文选题：钢管混凝土柱 + 纯扭　；参考：《土木工程学报》2017年07期

【摘要】：自重和水平地震作用将对曲线梁桥中墩梁固结的墩柱和拱桥钢管混凝土结构的主拱产生偏压和扭转复合效应。为研究钢管混凝土柱在偏压荷载作用下的抗扭性能,完成了8个不同截面形状钢管混凝土柱试件单调纯扭加载、往复纯扭加载和偏压-往复扭转加载拟静力试验。试验结果表明:钢管混凝土柱在往复扭转作用下的滞回曲线较为饱满,没有"捏拢"现象产生,试件的强度和刚度的损伤退化程度较低,具有较好的耗能能力。矮柱试件破坏现象较高柱试件更为明显,矮柱试件的屈服转角小于高柱,屈服扭矩与高柱相差不大,极限承载力大于高柱,极限转角小于高柱,耗能能力比高柱更好。偏压-往复扭转荷载作用下的方形截面试件刚度退化较为明显,偏压作用导致方钢管混凝土柱试件耗能能力降低。极限状态下,偏压作用改变了钢管的褶皱角度。
[Abstract]:Gravity and horizontal earthquake will produce the compound effect of deflection and torsion on the main arch of concrete-filled steel tube structure of curved girder bridge. In order to study the torsional behavior of concrete-filled steel tubular columns under eccentric loading, the pseudostatic tests of eight concrete filled steel tubular columns with different section shapes under monotonic torsional loading, reciprocating pure torsion loading and eccentric compression and reciprocating torsion loading were carried out. The experimental results show that the hysteretic curves of concrete-filled steel tubular columns under the action of reciprocating torsion are relatively full, no "pinch" phenomenon occurs, and the damage and degradation of the strength and stiffness of the specimens are lower and have better energy dissipation capacity. The failure phenomenon of low column specimen is more obvious than that of high column specimen. The yield angle of short column specimen is smaller than that of high column, the yield torque is not different from that of high column, the ultimate bearing capacity is larger than high column, the ultimate turning angle is smaller than high column, and the energy dissipation capacity is better than that of high column. The stiffness degradation of square section specimens under eccentric and reciprocating torsional loads is obvious, and the energy dissipation capacity of concrete filled square steel tube columns decreases due to eccentric compression. At the limit state, the bending effect changes the fold angle of the steel pipe.
【作者单位】：重庆大学;
【基金】：国家自然科学基金(51508052)
【分类号】：TU398.9

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