钢管混凝土-钢板耗能键结构抗震试验与承载力模型

Seismic tests and load-bearing capacity calculation model of structures with CFST columns and steel plate energy dissipation connectors

提出了钢管混凝土-钢板耗能键结构,进行了2个钢管混凝土-钢板耗能键结构1/5缩尺模型的低周反复荷载试验,1个结构模型的高跨比为1.0,1个结构模型的高跨比为2.0。试验分两阶段进行:第I阶段试验加载至1/50位移角结束;之后,对第I阶段损伤模型采用钢管边框间两侧贴焊薄钢板方式修复,作为新的试件进行第II阶段试验。比较分析了它们的承载力、延性、耗能、刚度及退化过程和滞回特性。基于试验,建立了该结构的承载力计算模型,模型中钢板耗能键简化为桁架模型。在试验与分析的基础上,提出了该结构的抗震设计建议。研究表明:钢管混凝土-钢板耗能键结构具有良好的抗震性能,对不同高跨比的试件均具有较好的震后可修复性能,可用于结构抗震设计。

A structure with CFST columns and steel plate energy dissipation connectors was put forward in this paper.Two 1 /5 scaled structure specimens with height span ratio of 1.0 and 2.0 respectively were tested under low cyclic loading.The tests include two stages.At first,the horizontal load was applied to the specimens until the drift ratio reached to 1 /50.After that,thinner steel plates were welded on both sides of the wall to strengthen the damaged specimens,and then the retrofitted specimens were applied low cyclic loadings till failure.The load-bearing capacity,ductility,energy dissipation capacity,stiffness degradation process and hysteretic behavior were discussed.Based on the tests,the load-bearing capacity calculation model of the structure was established.The steel plate energy dissipation connector was simplified to the truss model.Based on the tests and analyses,seismic design suggestions were presented.Results show that,the structure with CFST columns and steel plate energy dissipation connectors presents good seismic behavior.The specimens with different height span ratio are easy to be retrofitted after earthquake and can be used for seismic design of building structures.