斜梁桥体外预应力加固理论与方法研究
发布时间：2018-11-24 09:29
【摘要】：随着运营时间的推移以及交通量的增加，许多斜梁桥出现了不同程度的开裂和桥面系的损坏。本文针对斜梁桥损伤加固的现状，通过分析斜梁桥(尤其是边梁)的受力规律，提出了斜梁桥的体外预应力加固设计方法。主要研究内容如下： 1.以国内外斜梁桥和体外预应力加固理论与研究成果归纳分析为基础，通过比较体外预应力加固方法在正交和斜交梁桥的应用现状，明确了斜梁桥体外预应力加固设计的特点、目的和意义，以及预应力束的布置原则、要点和布置方式。 2.根据斜梁桥设计理论，通过斜梁桥的基本构造、受力特点以及斜梁桥受力影响因素分析，推荐了适合于斜梁桥加固力学性能分析的理论与方法。 3.以标准图30m跨径预应力简支梁桥为研究对象，通过建立斜梁桥参数模型，分析斜梁桥参数变化时的弯矩分布及变化规律，，提出了斜梁桥受力性能参数分析方法。 4.基于斜梁桥受力特点及体外预应力束布置原则，通过对比分析斜梁桥参数变化时钝角和锐角方向的弯矩差值百分比，构建了以体外束水平直线段为设计要素（包括水平段的位置和长度）的斜梁桥体外预应力加固设计方法，给出了适用范围，并分析了体外束直线段偏移量的影响因素。 5.基于本文提出的斜梁桥体外预应力加固设计方法，通过斜交角60°、宽跨比0.4的斜梁桥加固前后各项指标验算结果对比分析，验证了本文方法的可行性及合理性。
[Abstract]:With the passage of operation time and the increase of traffic volume, many oblique girder bridges have been cracked and damaged to varying degrees. According to the present situation of damage strengthening of oblique beam bridge, this paper puts forward the design method of external prestressing reinforcement of oblique beam bridge by analyzing the force law of oblique beam bridge (especially the side beam). The main contents are as follows: 1. Based on the induction and analysis of the theory and research results of oblique beam bridge and external prestressed reinforcement at home and abroad, the characteristics of external prestressing reinforcement design of oblique beam bridge are clarified by comparing the application status of external prestressing reinforcement method in orthogonal and skew beam bridges. Purpose and significance, as well as the prestressing beam layout principle, key points and layout mode. 2. According to the design theory of skew beam bridge, through the analysis of the basic structure, the characteristics of the force and the factors affecting the force of the inclined beam bridge, the theory and method suitable for the analysis of the mechanical properties of the skew beam bridge are recommended. 3. Taking 30m span prestressed simply supported beam bridge as the research object, this paper analyzes the distribution and variation law of bending moment when the parameter of skew beam bridge changes by establishing the parameter model of skew beam bridge, and puts forward the analysis method of force performance parameters of skew beam bridge. 4. Based on the stress characteristics of oblique beam bridge and the principle of external prestress bundle arrangement, the percentage of moment difference between the obtuse angle and the acute angle is analyzed by comparing the parameters of the oblique beam bridge. The design method of external prestressing reinforcement of oblique beam bridge with horizontal straight line segment of external beam (including the position and length of horizontal section) is constructed, and the applicable range is given, and the factors influencing the deviation of line segment of external beam are analyzed. 5. Based on the external prestressing reinforcement design method of oblique beam bridge proposed in this paper, the feasibility and rationality of this method are verified by comparing and analyzing the results of each index before and after reinforcement of oblique beam bridge with oblique angle of 60 掳and width to span ratio of 0.4.
【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】：U445.72;U448.27
本文编号：2353144
[Abstract]:With the passage of operation time and the increase of traffic volume, many oblique girder bridges have been cracked and damaged to varying degrees. According to the present situation of damage strengthening of oblique beam bridge, this paper puts forward the design method of external prestressing reinforcement of oblique beam bridge by analyzing the force law of oblique beam bridge (especially the side beam). The main contents are as follows: 1. Based on the induction and analysis of the theory and research results of oblique beam bridge and external prestressed reinforcement at home and abroad, the characteristics of external prestressing reinforcement design of oblique beam bridge are clarified by comparing the application status of external prestressing reinforcement method in orthogonal and skew beam bridges. Purpose and significance, as well as the prestressing beam layout principle, key points and layout mode. 2. According to the design theory of skew beam bridge, through the analysis of the basic structure, the characteristics of the force and the factors affecting the force of the inclined beam bridge, the theory and method suitable for the analysis of the mechanical properties of the skew beam bridge are recommended. 3. Taking 30m span prestressed simply supported beam bridge as the research object, this paper analyzes the distribution and variation law of bending moment when the parameter of skew beam bridge changes by establishing the parameter model of skew beam bridge, and puts forward the analysis method of force performance parameters of skew beam bridge. 4. Based on the stress characteristics of oblique beam bridge and the principle of external prestress bundle arrangement, the percentage of moment difference between the obtuse angle and the acute angle is analyzed by comparing the parameters of the oblique beam bridge. The design method of external prestressing reinforcement of oblique beam bridge with horizontal straight line segment of external beam (including the position and length of horizontal section) is constructed, and the applicable range is given, and the factors influencing the deviation of line segment of external beam are analyzed. 5. Based on the external prestressing reinforcement design method of oblique beam bridge proposed in this paper, the feasibility and rationality of this method are verified by comparing and analyzing the results of each index before and after reinforcement of oblique beam bridge with oblique angle of 60 掳and width to span ratio of 0.4.
【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】：U445.72;U448.27
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