钢筋网复合砂浆加固钢筋混凝土框架梁的抗震性能试验研究

SEISMIC BEHAVIOR OF RC FRAME BEAMS STRENGTHENED BY FERROCEMENT LAMINATES

通过对2个钢筋网复合砂浆加固钢筋混凝土框架梁和1个未加固框架梁的对比试验,分析低周反复荷载作用下钢筋网复合砂浆加固钢筋混凝土框架梁的加固效果,根据实测的框架梁的抗震承载力、延性、破坏形态及其滞回特性,讨论节点处钢筋网不同锚固方式对框架梁抗震性能的影响。结果表明：1）钢筋网复合砂浆加固技术能有效提高框架梁的抗震承载力,但对延性的提高不明显;2）梁柱节点处采用植筋锚固及采用弯折锚固的钢筋网复合砂浆加固的框架梁在低周反复荷载作用下均未发生锚固破坏;3）在未对梁柱节点有效加固的情况下,钢筋网复合加固的框架梁在梁柱节点核心区处先发生破坏。

Two reinforced concrete frame beams strengthened by ferrocement laminates and one non-reinforced RC frame beam were tested under quasi-static loading,and the reinforcement effect of frame beams strengthened by ferrocement laminates was analyzed. The seismic bearing capacity, ductility, failure modes and hysteresis characteristics of all beams were tested,and the effects of anchoring mode of reinforcing grid at the beam-column joints on the seismic behavior of tested beams were analyzed. The results showed that ferrocement laminates could effectively improve the seismic bearing capacity of the frame beam,but it had little effect on the ductility; no matter the ferrocement laminates frame beams adopted bonded rebar anchorage or hooked anchorage at the joints,none of the frame beams under the action of the quasi-static loading suffered any damage at anchorage; in the case that the beamcolumn joint was not strengthened,the failure occurred firstly at the core zone of beam-column joint of the frame beam strengthened by ferrocement laminates.