【摘要】 为了研究阻尼器处开洞楼板对装配式混凝土框架节点区域抗震性能的影响,设计了带楼板的装配式混凝土框架节点试件,并对其进行了低周反复加载试验,研究了试件的破坏特征、承载能力、滞回曲线、骨架曲线、刚度退化、等效黏滞阻尼系数等。试验结果表明:相对于无楼板装配式混凝土框架节点,带楼板的装配式混凝土框架节点试件滞回曲线较饱满,具有良好的耗能效果,增大了试件的刚度,还提高了试件的承载能力;但是由于楼板的存在,增加了梁和阻尼器上部的刚度,使得梁中性轴上移,造成各种抗震性能指标在正负向加载时差别较大,也造成阻尼器下翼缘和上翼缘变形差别较大。为了改善阻尼器上下翼缘受力变形不一致的问题,笔者提出两条改进建议:一是改进阻尼器上下翼缘截面大小,做成上下翼缘截面不一样大小,来匹配受力不一样的问题;二是改变阻尼器在梁高度方向的安装位置,使得梁板中和轴正好位于阻尼器的形心位置。更多还原

【Abstract】 In order to study the influence of the slab opening at the damper on the seismic performance of the prefabricated concrete frame(PCF)joint area, a PCF joint specimen with a floor slab was designed, and low-cycle repeated loading tests were carried out to study the damage features, bearing capacity, hysteresis curve, skeleton curve, stiffness degradation, equivalent viscous damping coefficient of the specimen, etc. The results show that compared with prefabricated concrete frame joints without floor slab, the hysteresis curve of the PCF joint with floor slab is relatively full, has a good energy dissipation effect, increases the stiffness of the specimen, and improves the load-bearing capacity of the specimen; but due to the existence of the floor, the rigidity of the upper part of the beam and the damper is increased, which causes the neutral axis of the beam to move up, resulting in a large difference between various seismic performance indicators when loaded in positive and negative directions, and also resulting in a large difference in the deformation of the lower flange and the upper flange of the damper. In order to improve the problem of inconsistent force and deformation of the upper and lower flanges of the damper, two suggestions were proposed: one is to improve the size of the upper and lower flange sections of the damper, and make the upper and lower flange sections have different sizes to match the different forces. The second is to change the installation position of the damper in the height direction of the beam so that the neutral axis of the beam plate is exactly at the centroid position of the damper.更多还原