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纤维增强聚合物(FRP)与普通建筑材料相比有较大优势,但其不足之处是初期投资高、刚度较低及现场经验匮乏。为了促进该项技术的发展,在美国德克萨斯州设计建造了一座FRP与钢筋混凝土(RC)组合梁桥,FRP梁采用U形截面,内设48mm撑杆以提高FRP梁与RC桥面板的结合强度。桥梁建成后,分别通过声发射法和应变测试法对其在车辆荷载作用下的响应进行了检测。结果表明:桥梁经过2年运营未出现明显损坏和老化迹象;梁端部转动受到较大约束;护栏对桥梁刚度的增强有重要作用;FRP梁和RC板结合效果良好;桥梁具有很大的荷载横向分布能力。
Fiber reinforced polymer (FRP) has advantages over ordinary building materials, but its disadvantages are high initial investment, low stiffness and lack of field experience. In order to promote the development of this technology, a composite FRP and RC composite beam bridge was designed and built in Texas, USA. The FRP beam adopts a U-shaped section with 48mm struts to improve the FRP beam and RC bridge Panel bonding strength. After the completion of the bridge, its response to vehicle loads was tested by acoustic emission method and strain measurement method respectively. The results show that there is no obvious signs of damage and aging after 2 years of operation. The rotation of the beam ends is greatly restrained. The guardrail plays an important role in enhancing the rigidity of the bridge. The combination of FRP beam and RC plate has a good effect. Horizontal distribution capacity.