STATIC AND DYNAMIC BEHAVIOR OF A TRUSS BRIDGE MADE OF FRP PULTRUDED PROFILES
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摘要: 重庆市彭水县太原乡茅以升公益桥是我国第一座全部采用纤维增强复合材料(FRP)拉挤型材的桁架桥,跨度为20 m,桥宽为2.0 m。以该桥为背景,对拉挤型材性能、结构体系和连接节点进行分析。研究FRP拉挤型材桁架桥的静力和动力特性,包括在工厂预拼装后和现场使用174 d后对实桥结构进行的2次静力性能试验以及在现场进行的实桥动力性能测试,并采用SAP 2000对该桥进行了有限元分析。实测表明,FRP桁架桥具有较高的刚度和承载能力,在45%的人群设计荷载下结构变形为2.09 mm,空载状态下结构一阶竖向振动频率为10.8 Hz,有限元计算结果与测试结果吻合良好,说明可采用线弹性杆件计算分析FRP桁架桥结构。Abstract: Mao Yisheng Public Bridge in Chongqing is the first all FRP truss bridge made of pultruded profiles in China, with a span of 20 m and width of 2.0 m.Based on which, the behavior of pultruded profiles, some connection methods and structural system of the bridge were introduced.The static and dynamic behavior of the FRP pultruded bridge were studied.The bridge has been tested twice when it was pre-installed in the factory and 174 d after it opened.A dynamic behavior test was conducted also.All test cases were simulated using FEA program SAP 2000.The results show that the FRP truss bridge has a higher stiffness and load bearing capacity.It has a 2.09 mm deformation under 45% of design load, and the first vertical natural frequency is about 10.8 Hz.The results from FEA match the test results very well, showing that it is reasonable to consider the FRP truss members as the linear-elastic link elements.
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Key words:
- fiber reinforced polymer( FRP) /
- pultruded profiles /
- connections /
- structural deformation /
- FEA
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