灌浆套筒连接全装配式框架-剪力墙结构抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF FULL PRECAST SHEAR WALL-FRAME STRUCTURES WITH REINFORCEMENT SPLICED BY GROUT-FILLED SLEEVES

为研究采用灌浆套筒连接的全装配式框架-剪力墙结构的抗震性能,设计制作了1榀1/2比例两层两跨灌浆套筒连接全装配式框-剪结构模型试件PC-3,并对其进行了低周反复加载试验。通过与已有试验结果对比分析,研究了结构的破坏模式、滞回性能、刚度退化、位移延性和耗能能力等抗震性能指标。结果表明:灌浆套筒连接全装配式框-剪结构试件PC-3与全现浇试件RCFW的破坏模式基本相同,梁端塑性铰长度减小、位置外移,具有良好的耗能能力和较好的刚度特性,试件PC-3的屈服荷载、峰值荷载、极限荷载均略大于全现浇试件RCFW的相应值,但其差值均小于5.0%,延性略小于全现浇试件RCFW,加载过程中耗能较为平稳。两种全装配式框-剪结构均具有良好的抗震性能,工程实践中可供设计人员选择采用。

A cyclic lateral loading test was conducted on a full precast shear wall-frame structure specimen PC-3, which is a half-scale two-story two-bay RC shear wall-frame structure specimen with prefabricated shear wall panels and prefabricated frames, and in which all the longitudinal reinforcement in the frames were spliced by grout-filled sleeves. The seismic behaviors were studied comparing with existing experimental results, including the failure mode, hysteretic response, stiffness degradation, displacement ductility and energy dissipation capacities. All these parameters were compared with those of RCFW and PCFW2 studied in a companion paper. The test results show that the specimen PC-3 has a similar failure mode as the specimen RCFW, but exhibits shorter plastic hinges. The positions of the plastic hinges are shifted out. The test results also show that PC-3 has better energy dissipation capacity than RCFW. The seismic characteristic values such as the yield load, peak load, and ultimate load of PC-3 are larger than those of RCFW, but the difference is less than 5.0%. The displacement ductility of PC-3 is slightly less than that of RCFW, and the energy dissipation capacity of PC-3 grew more steadily during the whole loading process. The experimental investigation indicates that the two kinds of full precast shear wall-frame structures proposed in this paper and the companion paper have good seismic performance, and either of them can be chosen by designers when needed.