【作者】 李文华；

【导师】 周勇军；

【作者基本信息】 长安大学 ， 工程硕士 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 随着我国交通运输需求的增加,公路桥梁病害和损伤与日俱增。为保证我国交通运输的安全性和可靠性,对桥梁加固技术进行进一步研究具有重要意义。因此,本文旨在分析桥面铺装对空心板桥的荷载分布影响,在此基础上提出一种基于钢筋混凝土桥面铺装叠合效应的空心板桥加固方法,为桥梁加固提供科学的指导。本文采用桥梁静载试验和有限元模拟计算分析了桥面铺装加固法对空心板桥荷载分布的影响。首先,本文介绍了桥面铺装加固法的基本原理和主要流程并采用简支梁简化模型初步分析了桥面铺装法加固后空心板二次受力的特征。之后,以三跨简支空心板桥为例进行了桥面铺装加固,通过荷载试验分析了桥面铺装结构层对空心板桥挠度和应变的影响,之后,依据工程实例数据进行有限元模拟,进一步分析了桥面铺装叠合加固对空心板桥荷载分布的影响。此外,通过有限元模型中桥面铺装层厚度的变化分析了铺装结构层厚度和不同标号混凝凝土铺装层对加固效果的影响。最后,依据研究成果给出了桥面铺装加固法的基本施工流程和施工注意事项。简支梁简化模型初步分析结果表明桥面铺装加固法通过改变结构内部的内力分布情况,降低荷载的组合设计值,实现设计使用年限内?₀S?R。三跨简支混凝土空心板桥静载试验结果表明,桥面铺装加固层可以显著减少预应力空心板桥在静载作用下的挠曲变形,减少效果在31.2%-50.0%。加固后空心板桥的相对残余变形小于7%,可以认为加固后空心板桥在静载试验中基本不存在残余变形。有限元计算结果表明,考虑桥面铺装结构层影响的有限元模型比不考虑桥面铺装结构层影响的有限元模型挠度值减少29.73%-41.88%,纵向应变减少4.73%-28.13%,跨中弯矩值减少27.90%-34.46%。随着桥面铺装加固层厚度和强度的增加,预应力混凝土空心板桥各主梁跨中截面板底弯矩逐步减少。然而,当铺装层强度大于空心板混凝土强度时加固效果提升不显著。更多还原

【Abstract】 With the increasing of traffic demand in China,more and more highway bridge distresses and injuries are detected.In order to ensure the safety and reliability of the transportation in China,the bridge reinforcement technology shows great significance in further research.Therefore,the purpose of this paper is to analyze the influence of bridge deck pavement on the load distribution of the hollow slab bridge.Based on this,an advanced technology using reinforced concrete bridge deck pavement to reinforcement hollow slab bridge was putted forward to provide scientific guidance for the bridge reinforcement.This paper uses the bridge static test and finite element simulation analysis to research the bridge deck pavement reinforcement method for the influence of load distribution on the hollow slab bridge.First of all,this paper describes the basic principle of bridge deck pavement reinforcement method and the main process simplified model.The simplified model was used to analyze the characteristics of the secondary stress in reinforced hollow slab.Then,an example of three span simply supported hollow slab bridge with bridge deck pavement layer were analyzed by using load test to detect hollow slab bridge deflection and strain.After that,a finite element simulation based on practical engineering data was done to future analyze the bridge deck pavement composite reinforcement effect on the load distribution on the hollow slab bridge.In addition,through changing the surfacing layer thicknesses in the finite element model,the influence of surfacing layer thicknesses was analyzed.Preliminary analysis results of the simplified model show that simple beam bridge deck pavement reinforcement method reinforces bridge by changing the internal force distribution of the structure,the combination of lower load design value S,in the design of use fixed number of year.Three span simply supported reinforced concrete hollow slab bridge static load test results show that the strengthening of the deck surfacing layer can significantly reduce the prestressed hollow slab bridge deflection under static load,reduce the effect from 31.2% to 50.0%.After strengthening the relative residual deformation is less than 7% of the hollow slab bridge,can be thought of the hollow slab after reinforcement basic does not exist in the static load test residual deformation.Finite element calculation results show that the finite element model considering the effects of bridge deck pavement structure layer than that without considering the effects of bridge deck pavement structure layer finite element model of deflection value reduced by 29.73%-29.73%,the longitudinal strain reduced by 4.73%-28.13%,across the bending moment value reduced by 27.90%-34.46%.With the increase of bridge deck pavement reinforcement layer thickness,the prestressed concrete hollow slab bridge girder cross section in each plate bending moment reduced gradually,but the bending moment value trends had no significant change in the cross.更多还原