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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >INFLUENCE OF JOINT-SHEAR STRESS ON SEISMIC BEHAVIOUR OF EXTERIOR BEAM-COLUMN JOINTS REINFORCED WITH GFRP BARS AND STIRRUPS
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INFLUENCE OF JOINT-SHEAR STRESS ON SEISMIC BEHAVIOUR OF EXTERIOR BEAM-COLUMN JOINTS REINFORCED WITH GFRP BARS AND STIRRUPS

机译：剪剪应力对GFRP筋和梁加固外梁-柱节点的抗震性能的影响

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摘要

The demand for sustainable concrete structures has been driving the use of glass fibre-reinforced polymer (GFRP) bars as main reinforcement in concrete structures. The behaviour of GFRP bars under tension-compression load reversals in reinforced concrete (RC) beam-column joints and frame structures has not been fully investigated yet. Furthermore, concerns still remain regarding the ability of FRP-RC frame structures to dissipate energy in seismic loading events due to the elastic-linear behaviour of the FRP reinforcement. The Canadian code, CSA/S806-02, allows using FRP stirrups for confining concrete columns in seismic regions; however, it doesn't evaluate the shear capacity of the joint. This paper attempts to partially fulfill this gab by investigating the structural behaviour of beam-column joints reinforced with GFRP bars and stirrups. Four full-scale exterior beam-column joint (T-shaped) prototypes were constructed and tested under simulated seismic load conditions. Test parameters include the type of anchorage of the GFRP beam longitudinal bars within the joint (straight-headed bars or right-angle bent bars) and joint-shear stress level. Test results are presented in terms of load-drift ratio relationship, ultimate capacity and mode of failure. The experimental results showed a superior performance of the straight-headed bars over bent ones. Also, high level of horizontal shear stress in the joint reduced the ability of the SDecimen to dissiDate more seismic enerav.
机译：对可持续混凝土结构的需求已推动使用玻璃纤维增​​强聚合物（GFRP）钢筋作为混凝土结构的主要增强材料。 GFRP钢筋在钢筋混凝土（RC）梁柱节点和框架结构中承受拉压载荷时的性能尚未得到充分研究。此外，由于FRP增强材料的弹性线性行为，FRP-RC框架结构在地震荷载作用下耗散能量的能力仍然令人担忧。加拿大法规CSA / S806-02允许使用FRP箍筋限制地震区域中的混凝土柱。但是，它不评估接头的剪切能力。本文试图通过研究用GFRP筋和箍筋加固的梁柱节点的结构性能来部分地解决这一问题。在模拟地震载荷条件下，构造并测试了四个完整的外部梁柱联合（T形）原型。测试参数包括GFRP梁纵向钢筋在接缝内的锚固类型（直头钢筋或直角弯曲钢筋）和接缝剪切应力水平。测试结果以负载-漂移比关系，极限容量和故障模式的形式给出。实验结果表明，直头钢筋的性能优于弯曲钢筋。同样，关节中高水平剪切应力降低了SDecimen消耗更多地震能量的能力。

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