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对8根带有横隔板补强的部分填充圆形钢管混凝土桥墩柱在轴力恒定,水平往复荷载作用下的力学性能进行了试验研究。分析了混凝土填充高度、桥墩长细比和径厚比等参数对该类桥墩承载力、延性、累积耗能等抗震性能的影响。试验结果表明:横隔板的添加改善了钢管与混凝土共同工作状态,混凝土填充率是影响该类桥墩破坏形态及抗震性能的主要因素。混凝土填充率过低,钢管会在填充混凝土的上方发生局部失稳破坏;当混凝土填充率达到0.33时,试件将在根部破坏,表现出良好的抗震性能。另外,桥墩的长细比和径厚比也是影响该类桥墩破坏及抗震性能的重要因素。
The mechanical properties of eight partially filled circular CFST pillars with transverse bulkhead reinforcement subjected to constant axial loads and horizontal reciprocating loads were studied. The effects of concrete filling height, pier slenderness ratio and diameter to thickness ratio on the seismic performance of bearing capacity, ductility and cumulative energy dissipation of the piers are analyzed. The experimental results show that the addition of diaphragm improves the co-operation of steel pipe and concrete, and the filling rate of concrete is the main factor affecting the failure form and seismic performance of such pier. When the filling rate of concrete is too low, the local instability of the steel pipe will occur above the filled concrete. When the filling rate of concrete reaches 0.33, the specimen will be destroyed at the root and show good anti-seismic performance. In addition, the slenderness ratio and diameter to thickness ratio of the pier are also important factors that affect the failure and seismic performance of such piers.