分阶段施工桥梁线形控制
发布时间：2018-10-05 18:36
【摘要】：桥梁结构分阶段施工方法及其分阶段施工技术的发展已成为土木工程界最引人注目的成就之一,尽管分阶段施工方法在许多方面都具有明显的优势,但该方法所得到最终成桥状态的内力和线形与一次整体施工法相比,存在很大差异,为了解决分阶段施工桥梁的结构分析问题,桥梁学者提出了分阶段成形结构分析理论,本文以分阶段成形结构的分析理论为核心,主要研究了五个部分的内容：第一部分回顾了分阶段施工桥梁的发展历程,阐述了分阶段施工工艺及分类、分阶段施工桥梁的结构分析方法和分阶段施工桥梁中间状态的确定方法。详细介绍了分阶段成形结构分析理论的基本平衡方程,该理论方程表明结构最终状态的内力和线形由荷载、结构体系和构件单元的无应力状态量三个条件唯一确定,该理论在创立之初主要应用于索结构桥梁,即无应力状态法。第二部分介绍了桥梁成桥线形的组成,根据分阶段施工桥梁的分析理论,在以构件单元的无应力状态量进行桥梁的线形控制时,由于成桥线形表现为一系列离散的高程点,本文选取三次样条插值的方法来求取节段的无应力曲率,详细介绍了具体的推导过程,并用具体算例证明所得结果的准确性。第三部分将成桥线形的节点高程值引入分阶段成形结构分析理论的基本平衡方程,得到了主梁的线形控制方程。取无应状态量作为桥梁线形的控制参量,对于预制梁段,推导了节段在预制时所需要的各个参数,并基于这些参量给出了节段形状轮廓图和预制形状轮廓形状的数学方程式；对于现浇施工的主梁节段,采用线形控制方程可直接得到中间施工过程中满足结构成桥线形的立模标高。第四部分介绍了考虑材料时变效应的桥梁线形控制,本文具体讨论的是混凝土的收缩徐变,根据分阶段成形结构分析理论,利用数值模拟的方法或线形控制方程可得到梁段因收缩徐变产生的无应力状态量变化量的计算公式,将此改变量作为对原无应力状态量的修正,通过最终修正后的无应力状态量进行桥梁的线形控制。第五部分主要考虑了分阶段施工过程中的温度影响,根据分阶段成形结构的分析理论可推导得到主梁节段两端高程差的数学表达式,基于该表达式,提出了一种或几种合理有效的方法修正施工过程中因温度变化而产生的响应,然后结合具体算例验证这几种方法所得结果的准确性并阐述了优缺点。
[Abstract]:The development of the phased construction method and the phased construction technology of bridge structure has become one of the most remarkable achievements in the field of civil engineering, although the phased construction method has obvious advantages in many aspects. However, the internal force and linear shape of the final completed bridge obtained by this method are quite different from that of the one-stage integral construction method. In order to solve the structural analysis problem of the bridge constructed by stages, bridge scholars put forward the theory of structured analysis of phased forming structure. In this paper, based on the analysis theory of the phased forming structure, the contents of five parts are mainly studied: the first part reviews the development course of the phased construction bridge, and expounds the construction technology and classification of the phased construction. The method of structure analysis and the method of determining the intermediate state of the bridge are presented in this paper. In this paper, the basic equilibrium equation of the theory of stage-forming structure analysis is introduced in detail. The theoretical equation shows that the internal force and the linear shape of the final state of the structure are determined only by three conditions: the load, the unstressed state quantity of the structural system and the member element. This theory was mainly used in cable-structure bridges at the beginning of its establishment, that is, the stress-free state method. In the second part, the composition of the bridge alignment is introduced. According to the analysis theory of the bridge construction by stages, when the structure is controlled by the unstressed state of the component element, the linear shape of the bridge is displayed as a series of discrete elevation points. In this paper, the cubic spline interpolation method is chosen to calculate the stress-free curvature of segments, and the concrete derivation process is introduced in detail, and the accuracy of the obtained results is proved by an example. In the third part, the nodal height of the bridge is introduced into the basic equilibrium equation of the theory of stage-forming structure analysis, and the linear control equation of the main beam is obtained. In this paper, the parameters of prefabricated beam segment are derived by taking the unresponsive state as the control parameter of bridge alignment. Based on these parameters, the section contour diagram and the mathematical equation of prefabricated shape contour are given. For the section of the main beam in cast-in-place construction, the vertical formwork elevation satisfying the linear shape of the bridge in the intermediate construction process can be directly obtained by using the linear control equation. In the fourth part, the linear control of bridge considering the time-varying effect of material is introduced. The concrete shrinkage and creep are discussed in this paper. By using the method of numerical simulation or linear governing equation, the formula for calculating the quantity of unstressed state change caused by shrinkage and creep in beam section can be obtained, which is regarded as a correction to the original unstressed state quantity. The linear control of the bridge is carried out by the modified state of stress. In the fifth part, the influence of temperature on the stage construction is considered, and the mathematical expression of the height difference between the two ends of the main beam segment can be derived according to the analysis theory of the phased forming structure, and based on this expression, In this paper, a reasonable and effective method is proposed to correct the response caused by the change of temperature in the construction process, and then the accuracy of the results obtained by these methods is verified with a concrete example and the advantages and disadvantages are expounded.
【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】：U445.4
本文编号：2254442
[Abstract]:The development of the phased construction method and the phased construction technology of bridge structure has become one of the most remarkable achievements in the field of civil engineering, although the phased construction method has obvious advantages in many aspects. However, the internal force and linear shape of the final completed bridge obtained by this method are quite different from that of the one-stage integral construction method. In order to solve the structural analysis problem of the bridge constructed by stages, bridge scholars put forward the theory of structured analysis of phased forming structure. In this paper, based on the analysis theory of the phased forming structure, the contents of five parts are mainly studied: the first part reviews the development course of the phased construction bridge, and expounds the construction technology and classification of the phased construction. The method of structure analysis and the method of determining the intermediate state of the bridge are presented in this paper. In this paper, the basic equilibrium equation of the theory of stage-forming structure analysis is introduced in detail. The theoretical equation shows that the internal force and the linear shape of the final state of the structure are determined only by three conditions: the load, the unstressed state quantity of the structural system and the member element. This theory was mainly used in cable-structure bridges at the beginning of its establishment, that is, the stress-free state method. In the second part, the composition of the bridge alignment is introduced. According to the analysis theory of the bridge construction by stages, when the structure is controlled by the unstressed state of the component element, the linear shape of the bridge is displayed as a series of discrete elevation points. In this paper, the cubic spline interpolation method is chosen to calculate the stress-free curvature of segments, and the concrete derivation process is introduced in detail, and the accuracy of the obtained results is proved by an example. In the third part, the nodal height of the bridge is introduced into the basic equilibrium equation of the theory of stage-forming structure analysis, and the linear control equation of the main beam is obtained. In this paper, the parameters of prefabricated beam segment are derived by taking the unresponsive state as the control parameter of bridge alignment. Based on these parameters, the section contour diagram and the mathematical equation of prefabricated shape contour are given. For the section of the main beam in cast-in-place construction, the vertical formwork elevation satisfying the linear shape of the bridge in the intermediate construction process can be directly obtained by using the linear control equation. In the fourth part, the linear control of bridge considering the time-varying effect of material is introduced. The concrete shrinkage and creep are discussed in this paper. By using the method of numerical simulation or linear governing equation, the formula for calculating the quantity of unstressed state change caused by shrinkage and creep in beam section can be obtained, which is regarded as a correction to the original unstressed state quantity. The linear control of the bridge is carried out by the modified state of stress. In the fifth part, the influence of temperature on the stage construction is considered, and the mathematical expression of the height difference between the two ends of the main beam segment can be derived according to the analysis theory of the phased forming structure, and based on this expression, In this paper, a reasonable and effective method is proposed to correct the response caused by the change of temperature in the construction process, and then the accuracy of the results obtained by these methods is verified with a concrete example and the advantages and disadvantages are expounded.
【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】：U445.4
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