HFRP铝合金组合桁架应急桥性价比分析研究  

Cost-effectiveness analysis of HFRP-aluminum alloy composite truss emergency bridges

作　　者：曾智刚 赵启林[2] 吴应松 刘海祥[3] 潘大荣[4] 杜琳 范炳辉 张晨[3] ZENG Zhigang;ZHAO Qilin;WU Yingsong;LIU Haixiang;PAN Darong;DU Lin;FAN Binghui;ZHANG Chen(Academy of Armed Police Forces,Beijing 100000,China;College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211800,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;College of Civil Engineering and Architecture,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]武警部队研究院,北京100000 [2]南京工业大学机械与动力工程学院,江苏南京211800 [3]南京水利科学研究院,江苏南京210029 [4]南京工程学院建筑工程学院,江苏南京211167

出　　处：《南京工业大学学报(自然科学版)》2025年第1期73-81,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点研发计划(2022YFC3202503)。

摘　　要：为了研究混杂纤维复合材料(HFRP)-铝合金组合桁架在应急桥上大规模推广应用的可行性,首先,建立该桥梁的三维有限元模型,计算其变形与振动特性,将理论计算值与现有装备实测值进行比较;其次,在满足应急桥刚度与强度要求情况下,利用该有限元模型研究不同碳纤维体积比的HFRP-铝合金组合桁架桥与全铝合金桥、全钢桥在桥梁振动性能、质量与原材料价格等方面的差异,利用理论推导解释振动特性随着用材变化而变化的内在机制。结果表明:有限元模型预测值与实测值基本一致,该模型可作为对比分析的基础;在变形与应力都满足设计要求情况下,HFRP与金属上弦组合的桥梁造价虽然比钢制桥梁高,但是造价与自重更轻的全铝合金桥梁相当,且自重是所有桥梁中最轻的,在振动频率上更容易满足规范要求;理论推导发现,在刚度控制设计桥梁中,结构1阶振动频率与结构质量呈反比关系,因此自重大幅度降低后的组合桥自振频率得到了有效提高。This study investigates the feasibility of large-scale application of hybrid fiber-reinforced resin-based composite material(HFRP)-aluminum alloy composite trusses in emergency bridges.Firstly,the three-dimensional finite element model of the bridge was established to calculate its deformation and vibration characteristics.The theoretical results were compared with the measured values from existing equipment.Subsequently,under the condition that the emergency bridge's stiffness and strength requirements were satisfied,the finite element model was used to study the differences in vibration performance,mass,and material cost between the HFRP-aluminum alloy composite truss bridge,all-aluminum alloy bridge,and all-steel bridge at different carbon fiber volume fractions.The theoretical analysis explained the internal mechanisms under lying the changes in vibration characteristics due to variations in material use.The results showed that the predicted values from the finite element model were basically consistent with the measured values,indicating that the model could serve as a reliable basis for comparative analysis.Under conditions when both deformation and stress met the design requirements,although the cost of the HFRP-metal upper chord composite bridge was higher than that of steel bridge,it was comparable to that of the lighter all aluminum alloy bridge.Furthermore,the composite bridge was the lightest among all bridge types and was more likely to meet vibration frequency standards.The theoretical analysis showed that,in stiffness-controlled design bridges,the first-order vibration frequency was inversely proportional to the structure's own weight.As a result,the substantial reduction in the composite bridge's self-weight effectively increased its natural frequency.

关 键 词：HFRP 铝合金 组合桁架 应急桥 性价比 振动 基频 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]