现浇钢筋混凝土框架施工缝抗震性能试验

Experimental study on seismic behavior of cast in-site RC frame with construction joints

为了研究施工缝对结构构件抗震性能的影响,对带有施工缝的两层两跨钢筋混凝土框架的抗震性能进行了低周反复试验研究.将整浇框架作为对比试件,对框架的破坏特征、承载能力、滞回曲线、骨架曲线、位移延性、刚度退化以及残余变形进行了对比分析.结果表明,带有施工缝的框架位移延性系数低于整浇框架约11%,有施工缝框架的相对变形大于整浇框架约4.1%～5.1%;当施工缝不认真处理时,会在框架中形成薄弱跨.施工缝对结构的承载能力和刚度退化影响不显著.

To investigate the effects of construction joints on seismic behaviors, an experiment for two-bay, two-storied RC frame structure with construction joints under low cyclic loading was conducted. Failure characteristics, bearing capacity, hysteretic curves, skeleton curves, displacement ductility, stiffness degradations and residual deformation of members were analyzed and compared with those of the monolithic cast frame. Test results show that the displacement ductility ratio of RC frame with construction joints is about 11% lower than that of the monolithic cast frame. And the relative deformation of RC frame with construction joints is about 4. 1% - 5.1% greater than that of the monolithic cast frame. If construction joints are treated carelessly, the span of weakness is easy to form in the concrete frame. While the effects of construction joints on bearing capacity and stiffness degradation of the frames are indistinctive.