Four circular hollow reinforced concrete columns were tested under quasi-static reversed lateral loading to investigate their seismic performance. The effects of the wall thickness ratio and confinement configuration on their seismic performance were studied, and the applicability of seismic ductility design requirements on circular hollow concrete columns was examined. The test results showed that circular hollow concrete columns with a single layer of transverse reinforcement presented limited ductility, and their displacement ductility improved as the wall thickness ratio increased. Two layers of transverse reinforcement with crossties allowed circular hollow concrete columns to present excellent seismic performance. However, the column designed with a smaller amount of inner transverse reinforcement presented a better response than the as-built column with equal amounts of inner and outer transverse reinforcement. In addition, the widely used seismic design requirements on the volumetric ratio of transverse reinforcement seem to be conservative for the ductile design of circular hollow concrete columns.

中文翻译：

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圆形空心混凝土柱的抗震性能

四个圆形空心钢筋混凝土柱在准静态反向横向荷载下进行了测试，以研究其抗震性能。研究了壁厚比和约束配置对其抗震性能的影响，并检验了抗震延性设计要求对圆形空心混凝土柱的适用性。试验结果表明，单层横向配筋的圆形空心混凝土柱的延性有限，随着壁厚比的增加，其位移延性提高。两层带横梁的横向钢筋使圆形空心混凝土柱具有优良的抗震性能。然而，设计有少量内横向钢筋的柱比具有等量内、外横向钢筋的竣工柱表现出更好的响应。此外，广泛使用的对横向钢筋体积比的抗震设计要求对于圆形空心混凝土柱的延性设计似乎是保守的。