Performance Analysis of Replaceable Redundant Columns Enhancing the Seismic Resilience of RC Frame Structures
The replaceable redundant column is proposed for reinforcement concrete frame structures to enhance the seismic robustness and resilience.By controlling the failure of longitudinal rebar through the mechanical rebar coupler with different anchor lengths,and the rigid connection between the frame and redundant column can be transferred into a hinge connection.A detailed experiment was conducted to explore the influences of diameter and anchorage length of rebar on the tensile and seis-mic performance of mechanical rebar couplers,13 groups and 6 groups of mechanical rebar coupler specimens respectively were tested under tensile loading and high stress level of axial cyclic loadings,which were designed with different rebar diameters and anchoring lengths.Each group included 3 specimens,each specimen consisted of two bars and a mechanical rebar coupler.Applying the tested data to the simulation analysis of redundant column sections and components,it is demonstrated that by changing the anchorage length of the rebar in coupler,it is possible to control the automatic hin-ging of the connection when the redundant column deforms to the preset limit.It ensures that the re-dundant column can still provide vertical load-bearing capacity for critical structural columns after damage,and also protect these critical columns from experiencing severe damage when encountering strong earthquakes.
万方数据
维普
