车致随机振动对公路钢桥面铺装施工干扰效应研究

The vehicle-induced vibration on the steel bridge deck has a significant interference effect on the construction of asphalt concrete pavement. This project focuses on the train-induced vibration on the combined road and railway bridge and vibration induced by the eccentric traffic loads when the bridge is partially under construction and partially open to traffic, planning to reveal the effect of vehicle-induced vibration on the collaborative behavior and compaction effectiveness of steel bridge deck pavement system based on experimental and numerical simulation. Firstly, the time-dependent model of vehicle-induced vibration on the steel bridge deck will be established based on the power flow method, and the energy transmission characteristics of vehicle-induced random vibration on the steel bridge deck and influencing factors will be achieved. Secondly, collaborative deformation theory of bridge deck system will be incited to study the interaction mechanism that the spatial vibration effect of steel bridge deck on the performance of pavement and adhesive layer of pavement. Thirdly, the superposition effect of vehicle-induced vibration on the steel bridge deck and the construction machine loads will be determined, and the strengthening/deterioration mechanism of superposition effect on the compaction effectiveness of steel bridge deck pavement will be revealed based on the particle flow-finite differential coupling method. Lastly, the structural equation model of vehicle-induced vibration effect on the steel bridge deck pavement system will be developed to quantify the impact of vibration interference on the performance of steel bridge deck pavement. Outcomes of this research will be helpful to reveal the mechanism and discipline that vehicle-induce vibration interference effect on the performance of steel bridge deck pavement system, and to propose the steel bridge deck pavement technical system under complex environment.

车致振动引起公路钢桥面空间多向激振，对钢桥面沥青混凝土铺装施工干扰效应显著。本项目着眼于公铁两用桥列车振动和半幅通车半幅摊铺下车辆偏载振动，结合试验模拟和仿真计算探究车致振动干扰对公路钢桥面铺装系协同性能及压实功效的影响机理。首先基于功率流法建立公路钢桥面车致振动时变预测模型，明确车致随机振动能量传递时空规律与敏感性因素；然后引入桥面系协同变形理论，探索钢桥面空间振动对铺装层性能和层间粘结效应的交互作用机理；确立钢桥面振动与施工机具振动的叠加效应波动体系，采用颗粒流-有限差分耦合算法研究车致振动叠加效应对铺装压实功效的增益/抑制机理；最后构建公路钢桥面铺装系振动干扰效应评估的结构方程模型，量化车致随机振动对铺装系性能的影响程度。研究成果有助于揭示车致振动干扰对公路钢桥面铺装系结构性能的作用机理和影响规律，建立复杂环境下钢桥面铺装技术体系。

车致振动引起公路钢桥面空间多向激振，对钢桥面沥青混凝土铺装施工干扰效应显著。本项目着眼于公铁两用桥列车振动、沥青摊铺施工机械振动等多源振动，结合试验模拟和仿真计算探究车致振动干扰对公路钢桥面铺装系协同性能及压实功效的影响机理。首先，提出“轮-轨-桥”系统模拟假定策略，攻克了公铁联动荷载等效难题，基于有限元法解析车致随机激振作用下沥青铺面响应特性；然后，研究车致振动、高温摊铺力-热耦合作用下桥面板、铺面复合体系的变形响应施工特征，量化钢桥面板累积变形对沥青铺面摊铺施工平整度与层间粘结效应的影响规律，并分析了力-热耦合效应对密支座体系结构安全的影响；再后，研究列车振动激励、车辆偏载扰动、施工机具冲击等多源激振叠加响应下引起的压实荷载增/抑幅度与分布特征，量化评价列振干扰下沥青混合料重分布致离析现象，探究各工况下钢桥面铺面用沥青混合料性能（高、低温稳定性，抗疲劳性能等）异化特性，并研究桥面结构物构造特征对铺面施工量化影响关系，提出结构优化措施；最后，量化评估车致随机振动对铺面施工质量的影响特性，提出通列环境下公铁两用桥沥青铺面施工干扰效应综合量化评估模型。研究成果明晰了公铁两用桥沥青铺面致损机理，确立了车致振动、高温摊铺、桥面结构特征对沥青铺面施工质量量化影响规律，对公铁两用桥长寿命沥青铺面设计及精细化施工控制具有重要的指导意义，相关研究成果已成功应用于沪苏通长江大桥、南京长江大桥与九江长江大桥维修改造工程等重大工程，具有广阔的工程应用前景。

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