双层斜拉桥预拱度设置技术研究
发布时间：2018-12-16 10:27
【摘要】：斜拉桥是由塔、索、梁构成的组合体系桥，由于斜拉索的存在使斜拉桥成为了高次超静定结构。双层斜拉桥对成桥线形的要求非常高，故双层斜拉桥的设计存在一个通过设置预拱度来控制双层斜拉桥成桥线形满足设计线形的问题。如何确定斜拉桥的合理成桥状态以及如何确定斜拉桥的合理施工状态就涉及到合理的预拱度设置方案。 双层斜拉桥上下两层相互之间会产生显著的影响，这直接导致了双层斜拉桥比普通的单层斜拉桥受力和结构变形情况复杂得多。本文依托四川省绵阳市城南新区一号桥为分析对象，进行了以下一些关于双层斜拉桥预拱度的分析。 ①介绍了目前斜拉桥的发展历史，详细阐述了预拱度的定义和计算方式以及各种因素对预拱度设置的影响。 ②使用大型有限元分析软件MIDAS/Civil建立了四川省绵阳市城南新区一号桥的有限元模型，通过模型计算分析恒载、施工阶段荷载、车道荷载、人群荷载、横向风荷载、支座沉降等因素在上层人行桥和下层车行桥上分别产生的挠度，通过规范规定的荷载组合方式得到人行桥和车行桥的最大预拱度值。由于上层人行桥材料结构和受力形式的独特性导致人行桥的横向线形变化非常显著，，根据有限元软件计算结果，按照类似预拱度的计算方式，计算人行桥的横向预偏值。 ③使用MAPLE数学计算软件，对车行桥的主梁预拱度进行编程运算，对MIDAS/Civil中得出的结果进行验算，并且得出一个可以对特定斜拉桥跨中截面预拱度进行计算的通用程序。 ④对双层斜拉桥塔偏、上层人行桥和下层车行桥三者之间的相互影响进行了分析并得出结论。
[Abstract]:The cable-stayed bridge is a composite system bridge composed of tower, cable and beam. Because of the existence of cable, the cable-stayed bridge becomes a high-order statically indeterminate structure. The design of double-deck cable-stayed bridge has a problem of controlling the alignment of double-deck cable-stayed bridge by setting the pre-arch to satisfy the design alignment of the double-deck cable-stayed bridge. How to determine the reasonable completion state of cable-stayed bridge and how to determine the reasonable construction state of cable-stayed bridge are related to the reasonable pre-arch setting scheme. The upper and lower layers of double-deck cable-stayed bridge will have a significant influence on each other, which directly leads to a much more complicated stress and structural deformation of double-deck cable-stayed bridge than that of ordinary single-story cable-stayed bridge. Based on No.1 Bridge in Chengnan New District, Mianyang City, Sichuan Province, this paper analyzes the pre-arch of double-deck cable-stayed bridge. The main contents are as follows: 1. The development history of cable-stayed bridge at present is introduced. The definition and calculation method of pre-arch and the influence of various factors on the setting of pre-arch are described in detail. The finite element model of No. 1 Bridge in Chengnan New District, Mianyang City, Sichuan Province is established by using the large-scale finite element analysis software MIDAS/Civil. The dead load, construction stage load, driveway load, crowd load, transverse wind load are calculated and analyzed by the model. The deflection of the upper footbridge and the lower vehicular bridge caused by bearing settlement and other factors, the maximum pre-arch value of the footbridge and vehicular bridge is obtained by the load combination method stipulated in the code. Due to the unique material structure and force form of the upper footbridge, the lateral alignment of the footbridge is very significant. According to the results of the finite element software, the transverse pre-deflection value of the footbridge is calculated according to the calculation method similar to the pre-arch degree. (3) by using MAPLE mathematical calculation software, the pre-arch degree of the main girder of vehicular bridge is programmed, the results obtained in MIDAS/Civil are checked, and a general program is obtained to calculate the pre-arch degree of the middle section of a particular cable-stayed bridge. 4. The influence of tower deviation, upper pedestrian bridge and lower deck vehicle bridge on the tower deviation of double deck cable-stayed bridge is analyzed and the conclusion is drawn.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
本文编号：2382188
[Abstract]:The cable-stayed bridge is a composite system bridge composed of tower, cable and beam. Because of the existence of cable, the cable-stayed bridge becomes a high-order statically indeterminate structure. The design of double-deck cable-stayed bridge has a problem of controlling the alignment of double-deck cable-stayed bridge by setting the pre-arch to satisfy the design alignment of the double-deck cable-stayed bridge. How to determine the reasonable completion state of cable-stayed bridge and how to determine the reasonable construction state of cable-stayed bridge are related to the reasonable pre-arch setting scheme. The upper and lower layers of double-deck cable-stayed bridge will have a significant influence on each other, which directly leads to a much more complicated stress and structural deformation of double-deck cable-stayed bridge than that of ordinary single-story cable-stayed bridge. Based on No.1 Bridge in Chengnan New District, Mianyang City, Sichuan Province, this paper analyzes the pre-arch of double-deck cable-stayed bridge. The main contents are as follows: 1. The development history of cable-stayed bridge at present is introduced. The definition and calculation method of pre-arch and the influence of various factors on the setting of pre-arch are described in detail. The finite element model of No. 1 Bridge in Chengnan New District, Mianyang City, Sichuan Province is established by using the large-scale finite element analysis software MIDAS/Civil. The dead load, construction stage load, driveway load, crowd load, transverse wind load are calculated and analyzed by the model. The deflection of the upper footbridge and the lower vehicular bridge caused by bearing settlement and other factors, the maximum pre-arch value of the footbridge and vehicular bridge is obtained by the load combination method stipulated in the code. Due to the unique material structure and force form of the upper footbridge, the lateral alignment of the footbridge is very significant. According to the results of the finite element software, the transverse pre-deflection value of the footbridge is calculated according to the calculation method similar to the pre-arch degree. (3) by using MAPLE mathematical calculation software, the pre-arch degree of the main girder of vehicular bridge is programmed, the results obtained in MIDAS/Civil are checked, and a general program is obtained to calculate the pre-arch degree of the middle section of a particular cable-stayed bridge. 4. The influence of tower deviation, upper pedestrian bridge and lower deck vehicle bridge on the tower deviation of double deck cable-stayed bridge is analyzed and the conclusion is drawn.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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本文编号：2382188
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