自锚式悬索桥施工过程试验模拟及地震响应研究

发布时间：2018-05-31 10:55

本文选题：自锚式悬索桥 + 模型试验　；参考：《北京工业大学》2014年硕士论文

【摘要】：近年来，由于经济发展的需求，大跨度桥梁在我国飞速发展。自锚式悬索桥具有外形优美、适应性能力强等优点，在桥型选择时，受到设计者的青睐。但自锚式悬索桥的合理成桥状态是设计难点，而且在施工阶段大位移非线性问题非常突出，吊索张拉成为施工难点。而有限元模拟和缩尺模型试验是研究合理成桥状态和施工过程的重要手段。本文以某非对称独塔自锚式悬索桥为工程背景，设计并制作了缩尺模型，对施工全过程进行了模拟，并对几种索力张拉优化方案进行了试验验证，，最后对其地震响应规律及减隔震控制进行了初步探讨，为其后续的振动台试验进行了一些铺垫，本文的主要内容如下： 1.以某独塔自锚式悬索桥为原型，按照几何缩尺比1:20设计并制作了其缩尺试验模型，通过测试缩尺模型的动力特性参数，并与原桥成桥荷载试验得到的动力特性参数进行对比，验证了缩尺模型桥设计与制作的准确性，能够反映原桥的整体受力性能。 2.通过缩尺模型对施工全过程进行模拟并与原桥施工过程进行对比。通过对原桥施工阶段进行监控，并严格按照原桥施工阶段设计模型桥的施工顺序，吊杆采用分阶段张拉的方式，开展了模拟施工全过程的模型试验研究。对模型桥成桥的索力和几何坐标反推到原型桥并与原桥进行对比误差较小，能够真实反映实际桥梁的施工全过程。 3.根据索力张拉优化理论，设计4种吊索张拉优化方案，并对其进行数值模拟和模型试验研究。通过理论与试验研究验证了不同张拉优化方案的优劣性。 4.对自锚式悬索桥的地震响应规律及基于高阻尼隔震支座的减隔震控制进行了探讨。指出由于自锚式悬索桥为长周期结构，在近场地震激励下动力响应比远场激励下更大，基于高阻尼隔震支座能够起到一定的减隔震效果。
[Abstract]:In recent years, due to the demand of economic development, long-span bridges are developing rapidly in China. Self-anchored suspension bridge has many advantages such as beautiful shape and strong adaptability. However, the reasonable state of self-anchored suspension bridge is a difficult point in design, and the nonlinear problem of large displacement is very prominent in the construction stage, and the tension of sling becomes a difficult point in construction. Finite element simulation and scale model test are important means to study the reasonable state and construction process of the bridge. In this paper, based on the engineering background of an asymmetric self-anchored suspension bridge with single tower, the scale model is designed and made, the whole construction process is simulated, and several kinds of cable tension optimization schemes are tested and verified. Finally, the law of seismic response and the control of seismic isolation are preliminarily discussed. The main contents of this paper are as follows: 1. Taking a single tower self-anchored suspension bridge as the prototype, the scale test model is designed and made according to the 1:20 geometric scale ratio. The dynamic characteristic parameters of the scale model are tested and compared with the dynamic characteristic parameters obtained from the load test of the original bridge. The accuracy of the design and manufacture of the model bridge is verified, which can reflect the overall mechanical performance of the original bridge. 2. The whole construction process is simulated by scale model and compared with the original bridge construction process. By monitoring the construction stage of the original bridge and strictly according to the construction sequence of the model bridge designed in the construction stage of the original bridge, the model test study of simulating the whole construction process was carried out by using the method of stage tension of the suspension rod. The cable force and geometric coordinates of the model bridge are pushed back to the prototype bridge and compared with the original bridge, which can reflect the whole construction process of the actual bridge. 3. According to the theory of cable tension optimization, four kinds of sling tension optimization schemes are designed, and the numerical simulation and model test are carried out. The advantages and disadvantages of different tensile optimization schemes are verified by theoretical and experimental research. 4. The seismic response law of self-anchored suspension bridge and the isolation control based on high damping isolation support are discussed. It is pointed out that since self-anchored suspension bridge is a long-period structure, the dynamic response of self-anchored suspension bridge under near-field earthquake excitation is greater than that under far-field excitation, and the isolation bearing based on high damping can play a certain isolation effect.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25

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