城市钢管混凝土拱桥加固技术研究

发布时间：2018-06-02 18:30

本文选题：城市桥梁 + 钢管混凝土拱桥　；参考：《西南交通大学》2015年硕士论文

【摘要】：钢管混凝土拱桥拥有良好的美学艺术,极高的承载力,施工效率高,施工成本相对较低,因此在城市里得到了广泛应用。但是由于理论研究滞后于工程实践,早期建造的钢管混凝土拱桥大多出现了严重的病害,需要加固维修。本文基于泸州市沱江三桥(龙西大桥)的加固设计项目,研究了城市钢管混凝土拱桥加固维修的主要关键技术措施及BIM/BrIM新技术的应用方法。首先,研究中以同类型桥梁加固工作为基础,针对龙西大桥整体性及动力性不足问题提出了五种加固设计方案。然后建立Midas Civil有限元模型以确定适合增强龙西桥整体性的加固方案,并通过Midas Civil有限元模型分析验证了采用的桥面系体系转换方案可以有效抑制吊杆振动出现在低阶模态,使拱肋混凝土应力变化在1MPa内；然后对比分析验证加固前后的动力地震响应,研究发现仅地震波作用下主拱上下肋内力变化超过20%,但组合作用下桥梁地震内力最大仅13.54%提高,不会造成有不利影响。第二,针对龙西大桥存在拱肋混凝土脱空的病害,通过建立ANSYS主跨有限元模型分析,具体研究了不同脱空率(0、5%、10%、15%、20%)和不同脱空类型(整体脱空、局部脱空)对结构稳定性能和整体刚度的影响。研究发现：脱空病害虽然对结构的稳定性能影响有限,但是整体脱空对整体刚度有10%的劣化影响,应进行有效加固防止整体脱空出现。第三,针对龙西大桥拱座局部开裂病害,分析粘贴钢板加固和粘贴碳纤维加固两类不同材料的加固效果,确定了粘贴一层2cm钢板的加固方案或粘贴两层碳纤维布的加固方案可行。加固前考虑对荷载完全卸载至不可卸恒载,拱座绝大部分应力为-0.26～0.7MPa；加固后考虑活载放大1.3倍,拱座绝大部分应力为-5.4-0MPa。最后针对桥梁运维信息庞大复杂,养护调阅信息困难的问题,利用Solidworks与Revit参数化建模拼装建立了沱江三桥加固设计的BIM/BrIM模型,以文件集成的方式将运营加固阶段的数据信息集成到BIM/BrIM模型中。依靠BIM技术中的BIM模型实现了加固设计中的三维可视化和碰撞分析、统计材料用量、生成加固方案图纸、计算加固方案受力等应用,并为后期继续运营维护查看、调阅、分享信息提供了技术条件。
[Abstract]:Concrete-filled steel tubular arch bridge has been widely used in cities because of its good aesthetic art, high bearing capacity, high construction efficiency and relatively low construction cost. However, because the theoretical research lags behind the engineering practice, most of the early construction of CFST arch bridges have serious diseases, which need to be strengthened and maintained. Based on the reinforcement design project of Lutuojiang third Bridge (Longxi Bridge), this paper studies the main key technical measures of strengthening and maintenance of city concrete-filled steel tube (CFST) arch bridge and the application method of new BIM/BrIM technology. Firstly, based on the reinforcement work of the same type of bridge, five reinforcement design schemes are proposed for the lack of integrity and dynamic performance of Longxi Bridge. Then the Midas Civil finite element model is established to determine the reinforcement scheme which is suitable for strengthening the integrity of Longxi Bridge. Through the Midas Civil finite element model analysis, it is verified that the bridge deck system conversion scheme can effectively suppress the vibration of the suspension rod appearing in the low-order mode. The stress variation of arch rib concrete is made in 1MPa, and the dynamic seismic response before and after reinforcement is compared and verified. It is found that the internal force of upper and lower rib of main arch is more than 20 under the action of seismic wave only, but the maximum seismic internal force of bridge under combined action is only 13.54%. There will be no adverse effects. Secondly, in view of the defect of arch rib concrete void in Longxi Bridge, through the finite element model analysis of ANSYS main span, this paper specifically studies the different void ratio of 0%, 5% and 10%, and different types of void (integral void). The influence of partial void) on the stability and overall stiffness of the structure. It is found that although the void disease has a limited effect on the stability of the structure, the integral void has a 10% deterioration effect on the overall stiffness, which should be effectively strengthened to prevent the occurrence of the whole void. Thirdly, aiming at the local cracking disease of arch base of Longxi Bridge, the reinforcement effect of two kinds of different materials, which are reinforced with steel plate and carbon fiber, is analyzed. The strengthening scheme of one layer of 2cm steel plate or two layers of carbon fiber sheet is determined. Before strengthening, the load is completely unloaded to undetachable dead load, the stress of arch seat is -0.260.7MPa, and the stress of arch base is -5.4-0MPa after reinforcement, when the live load is enlarged 1.3 times, the stress of arch base is -5.4-0MPa. Finally, in view of the huge and complex information of bridge operation and maintenance, the BIM/BrIM model of the strengthening design of Tuojiang third Bridge is established by using Solidworks and Revit parameterized modeling. The data information of operation reinforcement phase is integrated into BIM/BrIM model by file integration. Based on the BIM model in BIM technology, the 3D visualization and collision analysis in reinforcement design, the quantity of statistical material, the drawing of reinforcement scheme, the calculation of the stress of reinforcement scheme and so on are realized, and they are checked and read for the later period of operation and maintenance. Sharing information provides technical conditions.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.22;U445.72

【参考文献】