预制夹芯墙GFRP拉结件锚固性能试验研究

EXPERIMENTAL STUDYON ANCHORAGE PERFORMANCEOF GFRP CONNECTORSIN PREFABRICATED SANDWICH WALL

为研究GFRP拉结件形式对其与混凝土锚固性能的影响,以拉结件形式为参数,设计制作两组试件。通过拉拔试验考察板式及棒式拉结件与混凝土的锚固性能,获得两组试件的破坏现象、荷载及位移变化。结果显示,棒式拉结件从混凝土中被拔出后拉结件表面呈现纤维断裂,而板式拉结件被拔出混凝土时拉结件表面相对完好。棒式拉结件试件组极限荷载平均值Nu为7.4kN,极限位移平均值为8mm;板式拉结件试件组Nu为11.1kN,极限位移平均值为5mm。基于试验结果分析,得出结论,棒式较板式拉结件锚固区应力集中作用明显,板式较棒式拉结件与混凝土锚固性能更优异;板式较棒式拉结件与混凝土锚固强度增幅达50%;棒式与板式拉结件试件均为延性破坏,且棒式较板式拉结件试件延性提高60%。

In order to study the influence of the GFRP connector form on the anchoring performance of concrete,two sets of test pieces were designed and manufactured with the form of the connector as parameters.The pull-out tests were carried out to investigate the anchorage bearing capacity of the plate-type connector and the rod-type connector and concrete.The failure phenomena and change of loads and displacement of the two sets of test pieces were obtained.Theresults show that fiber breakage occurs on the surface of the connector after the rod-type connector is pulled out of the concrete,and the surface of the connector is intact when the plate-type connector is pulled out of the concrete.The average value of the limit load Nu of the rod-type connector test piece group is 7.4kN,and the average value of the limit displacement is 8mm;The average value of the limit-displacement of the plate-type connector sample group Nu is 11.1kN;The average value of the limit displacement is 5mm.The results show that the stress-concentration effect of the rod-type connector is more obvious than that of the plate-type connector,and the plate-type connector has better anchoring performance with concrete.The anchoring performance of the plate-type is higher than that of the rod-type in the concrete has increased by 50%.The testing pieces of rod-type and plate-type connector are ductile failure,and the test pieces of rod-type connector has 60%higher ductility than the pieces of plate-type connector.