顶推法桥梁施工中贝雷片导梁的受力分析及稳定性分析
发布时间：2018-12-17 15:41
【摘要】：贝雷片作为一种快速组装的结构组件，最先在战争时期发明，用于便桥的快速架设与修复，，具有结构简单、运输方便、架设快捷、载重量大、互换性好、适应性强的特点，随后广泛应用于国防、战备、交通工程、市政水利等工程实践。某连续桥梁需跨越既有线路，为了保证线路的正常运营，方便主梁梁体施工，增加跨越能力，特采用主梁旁位现浇、顶推法施工方案，需要设置前后导梁。设计时考虑到施工现场的实际情况，由贝雷片拼装导梁，这与贝雷片以往的实践应用不同。以往贝雷片多应用于承重结构、架桥机、支架或便桥结构。如果将贝雷片制作成桥梁顶推法施工中的钢导梁，其结构设计与计算将具有很大的特殊性。 本文通过Midas/Civil有限元分析软件建立结构计算模型，探讨了由贝雷片拼装导梁结构的建模过程中的一些问题，合理地模拟了导梁与主梁安装连接、导梁内部各构件连接以及导梁支撑与约束条件，分析了导梁在顶推过程中可能遇到的各种荷载工况，较准确、直观地得到导梁结构中贝雷片各杆件的内力、应力及结构的受力特点。通过对施工全过程的仿真分析，找出导梁结构的受力规律及特点，提出合理的设计与改进建议。同时，对顶推法施工中可能存在的荷载及其它工况，分析其对贝雷片导梁稳定性的影响，利用Midas/Civil有限元分析软件的屈曲分析模块可以对导梁结构中各个因素的屈曲荷载特征值及屈曲失稳的模态形式做出分析与计算，提高贝雷片导梁的可靠度，为施工实践提供科学依据。 分析表明，自重荷载对导梁的受力及变形起控制作用，而主梁自重比贝雷片导梁大很多，所以，当主梁悬臂较大、端部有较大下挠和转角变形时，导梁端部构件内就存在较大的内力及应力。随着桥跨比的增大自重荷载所起的控制作用越发明显。同时，研究发现导梁两肢的共同受力、协调变形非常关键，即要保证导梁两肢有足够的横向连接强度和刚度。 目前关于顶推法中贝雷片导梁的相关理论和研究还比较欠缺，本文对贝雷片导梁受力特点和稳定性的分析，将填补国内外对贝雷片导梁相关研究的空白，对设计和施工实践提供有益的科学依据。
[Abstract]:As a kind of fast assembling structural component, the Bayley sheet was first invented in the war period. It is used in the rapid erection and repair of the bridge. It has the characteristics of simple structure, convenient transportation, quick erection, large load, good interchangeability and strong adaptability. Then widely used in national defense, combat readiness, traffic engineering, municipal water conservancy and other engineering practices. In order to ensure the normal operation of the line, facilitate the construction of the main girder beam and increase the span capacity, a continuous bridge needs to cross the existing line. Considering the actual situation of the construction site, the guide beam is assembled from the Bailey sheet, which is different from the previous application of the Bailey sheet. In the past, Bailey sheets were used in load-bearing structure, bridge erector, support or stool bridge structure. If the plate is made into the steel guide beam in the construction of the bridge jacking method, its structure design and calculation will have great particularity. In this paper, Midas/Civil finite element analysis software is used to establish the structural calculation model, and some problems in the modeling process of the guide beam structure assembled by the Bailey sheet are discussed, and the connection between the guide beam and the main beam is simulated reasonably. The connection of each member inside the guide beam as well as the support and constraint conditions of the guide beam are analyzed, and the various load conditions that the guide beam may encounter in the process of pushing are analyzed. The internal forces of the Berei plate members in the guide beam structure are obtained more accurately and intuitively. Stress and structural stress characteristics. Through the simulation analysis of the whole construction process, the force law and characteristics of the guide beam structure are found out, and the reasonable design and improvement suggestions are put forward. At the same time, the influence of the load and other working conditions on the stability of Belle plate guide beam is analyzed. The buckling analysis module of Midas/Civil finite element analysis software can be used to analyze and calculate the buckling load eigenvalues and modal forms of buckling instability of every factor in the guide beam structure, and to improve the reliability of the guide beam. To provide scientific basis for construction practice. The analysis shows that the self-weight load controls the force and deformation of the guide beam, and the weight of the main beam is much larger than that of the Belle beam. Therefore, when the cantilever of the main beam is larger, the end of the beam has a larger deflection and angular deformation. There is a large internal force and stress in the end member of the guide beam. With the increase of bridge span ratio, the control effect of deadweight load becomes more and more obvious. At the same time, it is found that the joint force and coordinated deformation of the two legs of the guide beam are very important, that is, to ensure the sufficient transverse connection strength and stiffness of the two legs of the guide beam. At present, the related theory and research on the plate guide beam in the pushing method are still relatively lacking. The analysis of the mechanical characteristics and stability of the plate guide beam in this paper will fill in the blank of the research on the guide beam of the plate at home and abroad. It provides beneficial scientific basis for design and construction practice.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
本文编号：2384402
[Abstract]:As a kind of fast assembling structural component, the Bayley sheet was first invented in the war period. It is used in the rapid erection and repair of the bridge. It has the characteristics of simple structure, convenient transportation, quick erection, large load, good interchangeability and strong adaptability. Then widely used in national defense, combat readiness, traffic engineering, municipal water conservancy and other engineering practices. In order to ensure the normal operation of the line, facilitate the construction of the main girder beam and increase the span capacity, a continuous bridge needs to cross the existing line. Considering the actual situation of the construction site, the guide beam is assembled from the Bailey sheet, which is different from the previous application of the Bailey sheet. In the past, Bailey sheets were used in load-bearing structure, bridge erector, support or stool bridge structure. If the plate is made into the steel guide beam in the construction of the bridge jacking method, its structure design and calculation will have great particularity. In this paper, Midas/Civil finite element analysis software is used to establish the structural calculation model, and some problems in the modeling process of the guide beam structure assembled by the Bailey sheet are discussed, and the connection between the guide beam and the main beam is simulated reasonably. The connection of each member inside the guide beam as well as the support and constraint conditions of the guide beam are analyzed, and the various load conditions that the guide beam may encounter in the process of pushing are analyzed. The internal forces of the Berei plate members in the guide beam structure are obtained more accurately and intuitively. Stress and structural stress characteristics. Through the simulation analysis of the whole construction process, the force law and characteristics of the guide beam structure are found out, and the reasonable design and improvement suggestions are put forward. At the same time, the influence of the load and other working conditions on the stability of Belle plate guide beam is analyzed. The buckling analysis module of Midas/Civil finite element analysis software can be used to analyze and calculate the buckling load eigenvalues and modal forms of buckling instability of every factor in the guide beam structure, and to improve the reliability of the guide beam. To provide scientific basis for construction practice. The analysis shows that the self-weight load controls the force and deformation of the guide beam, and the weight of the main beam is much larger than that of the Belle beam. Therefore, when the cantilever of the main beam is larger, the end of the beam has a larger deflection and angular deformation. There is a large internal force and stress in the end member of the guide beam. With the increase of bridge span ratio, the control effect of deadweight load becomes more and more obvious. At the same time, it is found that the joint force and coordinated deformation of the two legs of the guide beam are very important, that is, to ensure the sufficient transverse connection strength and stiffness of the two legs of the guide beam. At present, the related theory and research on the plate guide beam in the pushing method are still relatively lacking. The analysis of the mechanical characteristics and stability of the plate guide beam in this paper will fill in the blank of the research on the guide beam of the plate at home and abroad. It provides beneficial scientific basis for design and construction practice.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
【参考文献】
相关期刊论文 前10条
1 徐文明;袁端才;蒋志刚;胡平;;夹芯复合材料箱形导梁的挠度分析[J];兵工学报;2009年08期
2 李松报;;曲线桥梁分段悬臂挂篮施工控制关键技术[J];城市道桥与防洪;2009年03期
3 梁新明;;浅析贝雷片在便桥施工中的应用[J];福建建材;2010年03期
4 王章荣;采用贝雷片拼装架桥机架设T梁的设计与施工[J];福建建设科技;2004年04期
5 唐浩斌;刘智君;沈育民;;上承式贝雷梁钢便桥的设计[J];湖南交通科技;2006年03期
6 王卫锋;林俊锋;马文田;;桥梁顶推施工导梁的优化分析[J];工程力学;2007年02期
7 孔志永;;贝雷片拼装架桥机导梁的受力分析[J];广东建材;2006年12期
8 张晓东;桥梁顶推施工技术[J];公路;2003年09期
9 陈宝春,孙潮,陈友杰;桥梁转体施工方法在我国的应用与发展[J];公路交通科技;2001年02期
10 董创文;李传习;;连续梁顶推导梁合理参数的确定方法[J];公路交通科技;2010年09期
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