地锚式城市景观悬索桥施工监控技术研究
发布时间：2018-11-07 11:43
【摘要】：进入21世纪以来,我国的交通基础设施得到了空前的快速发展,在许多城市涌现出多种具有创新美、和谐美与协调美的造型新颖,风格独特的景观桥梁。悬索桥作为城市景观桥的主要选型之一,结构轻盈,桥形优美,具有极高的美学价值。城市景观悬索桥不同于传统的悬索桥,为了景观需要,其桥塔往往较传统悬索桥塔高,主缆的坡度较陡,这给实际施工造成了很大困难。基于此,阐述了悬索桥分类及其受力体系的特征,总结了城市景观桥的结构选型,并结合经南八路潮河大桥地锚式悬索桥实例工程,对地锚式悬索桥采用自锚式悬索桥体系转换施工方法进行监控。在监控实施之前,对主缆和索塔分别采用桥梁有限元软件MIDAS/Civil和ANSYS进行模拟分析;对塔柱及主梁线形和标高、应变进行监测,指导调索方案制订,并对整个施工过程桥梁结构的应力、索力、线形及温度等数据进行分析,得到如下主要结论:(1)索塔承台和锚碇等大体积混凝土的入模温度为26.3℃,凝结硬化过程中最高温度Tmax达到了70.1℃,养护过程中温度升高43.8℃,小于规范规定50℃,满足要求。(2)在索塔建设阶段,索塔各截面处于全截面受压状态,随着索塔混凝土节段浇筑施工的进行,塔根测试截面的压应力大体呈线性增加,与设计值误差在0.5MPa之内;体系转换过程中,索塔最大压应力为-7.4MPa,最大拉应力为1.862 MPa,与理论计算值吻合较好,满足施工规范和设计要求。(3)吊索张拉过程中,吊索实际测定拉力值与计算值吻合较好,二者之间误差较小;经过一期与成桥索力调整,成桥吊索内力与设计值最大偏差13.5%,全桥吊索内力分布较为均匀。(4)根据钢箱梁应力监控结果,主梁拉应力最大29MPa,压应力最大30MPa,无应力突变现象,施工过程安全。(5)潮河大桥的施工监测和控制实践表明,对索塔高度较高、主缆坡度较大的地锚式悬索桥,可以采用自锚式悬索桥体系转换施工方法。梁缆同时施工,节省工期。
[Abstract]:Since the beginning of the 21st century, the transportation infrastructure of our country has been developing rapidly, and a variety of landscape bridges with innovative beauty, harmony beauty and coordination beauty have emerged in many cities. As one of the main types of urban landscape bridges, suspension bridges are light in structure and graceful in shape. The urban landscape suspension bridge is different from the traditional suspension bridge. In order to meet the needs of the landscape, the bridge tower is often higher than the traditional suspension bridge tower, and the slope of the main cable is steep, which causes great difficulties to the actual construction. Based on this, this paper expounds the classification of suspension bridge and the characteristics of its force system, summarizes the structure selection of urban landscape bridge, and combines with the engineering example of ground anchor suspension bridge through Nanbailu Chaohe Bridge. The self-anchored suspension bridge system conversion construction method is used to monitor the ground anchor suspension bridge. Before the implementation of monitoring, the main cable and cable tower are simulated and analyzed by using the bridge finite element software MIDAS/Civil and ANSYS respectively. Monitoring the alignment, elevation and strain of tower column and main beam, guiding cable adjustment scheme, and analyzing the data of stress, cable force, line shape and temperature of bridge structure during the whole construction process. The main conclusions are as follows: (1) the entry temperature of mass concrete such as cable tower cap and Anchorage is 26.3 鈩，
本文编号：2316261
[Abstract]:Since the beginning of the 21st century, the transportation infrastructure of our country has been developing rapidly, and a variety of landscape bridges with innovative beauty, harmony beauty and coordination beauty have emerged in many cities. As one of the main types of urban landscape bridges, suspension bridges are light in structure and graceful in shape. The urban landscape suspension bridge is different from the traditional suspension bridge. In order to meet the needs of the landscape, the bridge tower is often higher than the traditional suspension bridge tower, and the slope of the main cable is steep, which causes great difficulties to the actual construction. Based on this, this paper expounds the classification of suspension bridge and the characteristics of its force system, summarizes the structure selection of urban landscape bridge, and combines with the engineering example of ground anchor suspension bridge through Nanbailu Chaohe Bridge. The self-anchored suspension bridge system conversion construction method is used to monitor the ground anchor suspension bridge. Before the implementation of monitoring, the main cable and cable tower are simulated and analyzed by using the bridge finite element software MIDAS/Civil and ANSYS respectively. Monitoring the alignment, elevation and strain of tower column and main beam, guiding cable adjustment scheme, and analyzing the data of stress, cable force, line shape and temperature of bridge structure during the whole construction process. The main conclusions are as follows: (1) the entry temperature of mass concrete such as cable tower cap and Anchorage is 26.3 鈩，
本文编号：2316261
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