O-Stable Panel装配整体式墙板抗震性能试验研究

SEISMIC PERFORMANCE EVALUATION OF ASSEMBLED O-STABLE PANEL WALLS

O-Stable Panel是一种新型装配整体式墙板,该文设计制作了三个不同底部连接方式的装配整体式O-Stable Panel试件和一个全现浇O-Stable Panel试件,通过低周反复加载试验评价该类墙板的承载力、延性、滞回耗能等指标,研究不同连接方式下的O-Stable Panel墙板与全现浇墙板在抗震性能上的差异。试验模型为结构原型的1∶2缩尺,墙体配筋依据等效全现浇结构的配筋。研究结果表明:装配式O-Stable Panel墙在往复荷载作用下最终都呈现为墙板竖向拼接处和墙板变截面处的贯通墙板裂缝;O-Stable Panel滞回曲线呈对称、稳定、没有明显捏拢收缩特点;采用灌浆套筒的竖向连接,随着控制位移增大,墙体抗震指标呈现急剧退化。采用预制墙片钢筋伸入底座的竖向连接,墙体等效粘滞阻尼系数均高于全现浇试件O-I-1型,滞回耗能性能与全现浇试件相近。

O-Stable Panel is a new type of assembled structural wall. Three integral prefabricated panel specimens with different vertical connections at the bottom and one full cast-in-place panel specimen were designed and tested under low cycle lateral reciprocating loading to evaluate the seismic performance properties of the O-Stable Panel system, such as bearing capacity, ductility and hysteretic energy dissipation. The performance of the prefabricated O-Stable Panel systems was compared with that of the full cast-in-place panel. The scale of the specimens is 1∶2 to the prototype structure, and the steel reinforcements of the panels were designed based on the detailing for the full cast-in-place RC structure in accordance with the current Chinese seismic design code. It is revealed that under the lateral reciprocating loading, vertical cracks were developed for all prefabricated O-stable panel specimens, penetrating the thickness of the panels at the panel joint and at the positions where panel thickness variation occurs at the ultimate failure state. The O-stable panels are found to exhibit symmetric and stable hysteretic curves without obvious pinching shape of the curves. The panel using grouting sleeve in vertical joint for steel rebar exhibits sharp degrading in seismic index when the lateral drift of the wall increases. For the panels with the preinstalled rebar stretched into the foundation beams for the vertical rebar joint, the equivalent damping ratio of the walls is greater than that of a full cast-in-place panel, and the value of their hysteretic energy dissipation is very close to that in a full cast-in-place panel.