再生混凝土框架节点抗震性能研究

Study on Seismic Behavior of Recycled Concrete Frame Joints

完成了3种不同再生粗骨料取代率再生混凝土框架边节点,在恒定竖向轴压荷载和水平低周反复荷载作用下的抗震性能试验研究.通过不同再生粗骨料取代率下的节点抗震性能对比分析,研究了再生混凝土节点在模拟地震作用下的破坏形态、滞回特性、延性等问题.研究表明,再生混凝土节点的破坏过程与普通混凝土相类似,虽然再生混凝土节点的抗震性能略低于普通混凝土,但再生混凝土节点的延性等抗震性能仍满足相应抗震设防要求,说明再生混凝土可用于有抗震设防要求的框架节点中.再生混凝土框架节点的水平抗剪承载力可直接采用现行混凝土结构设计规范中节点抗剪承载力计算公式计算.最后,提出了加强抗震构造要求的设计建议.

In this paper,seismic behavior of 3-scaled frame joints made of recycled aggregate concrete is studied under low frequency reversed lateral loading.The mass ratio of recycled coarse aggregate to the whole coarse aggregate is 0,50% and 100%,respectively.The failure features,the hysteresis loops and the ductility under seismic loads are comparatively investigated.The test and analyses show that the seismic behavior of joints with recycled concrete is slightly lower than that of joints with conventional concrete.However,the seismic behaviors,including the ductility etc.,still meet the related requirements of earthquake-resistance designing.So it is concluded in this paper that the recycled aggregate concrete can be applied in concrete structures.The formula for calculating the shear capacity of joints made of recycled aggregate concrete is proposed and compared with the formula in present Chinese Code for Concrete Structure Design.At last,some construction design recommendations are put forward.