多跨输煤皮带通廊桥架抗震性能分析

发布时间：2018-01-04 02:18

本文关键词：多跨输煤皮带通廊桥架抗震性能分析　出处：《西安科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：输煤皮带通廊桥架在煤矿、选煤厂以及火电厂等工厂都有着广泛的应用。随着我国煤炭行业的发展与建设标准的提高，输煤皮带通廊桥架结构的建设标准越来越高。可是输煤皮带通廊桥架结构在历次的地震中破坏较多，，给企业造成了严重的经济损失。所以，对输煤皮带通廊桥架结构的抗震性能进行深入的研究，提出抗震设计建议具有重要的理论意义和工程应用价值。本文利用SAP2000有限元软件，对工程中常见的3种结构形式的输煤皮带通廊桥架进行模拟，根据模拟计算结果，对三个结构的抗震性能进行了系统分析，主要做了下列研究工作: (1)对三种不同结构形式的桥架结构进行了模态分析，结果表明前三阶振型对结构的影响大，但高阶振型时桥架上部错动变形大，计算中高阶振型不能忽略。 (2)对三个桥架结构在纵、横、竖向及水平双向四个工况下的地震作用进行反应谱分析，分析表明桥架结构的柱顶位移角在1/2319~1/1045之间，均满足1/550的限值。桥架三加设下拉吊杆较三角腹杆式和下斜式无下拉吊杆的桥架刚度大，加设吊杆后，使得部分上、下弦杆的与无吊杆的桥架内力符号相反，部分内力被抵消，减小了桥架挠度。 (3)对三个桥架结构做了地震作用下的弹性时程分析，并与反应谱分析结果进行对比。分析表明此类大跨度结构应当注意端门架的刚度，以保证在横向地震来临时结构的安全性。 (4)对桥架进行了动力弹塑性时程分析，得出结构在八度罕遇地震作用下的变形与受力，非线性分析结果表明下部混凝土支架的框架梁和柱均不同程度的进入塑性状态，其中框架柱的下端为薄弱位置。本文结合国内外的工程实例与经验，通过对实际结构的模拟分析提了一些抗震建议，为以后设计人员对此类结构的抗震设计与分析提供参考。
[Abstract]:Coal conveyance belt is widely used in coal mines, coal preparation plants and thermal power plants, etc. With the development of coal industry and the improvement of construction standards in China. The construction standard of coal conveyer belt through the bridge structure is higher and higher. However, the coal conveyer belt bridge bridge structure has been destroyed more in successive earthquakes, which has caused serious economic losses to enterprises. The aseismic performance of coal conveyer belt through the bridge frame structure is studied in depth. It is of great theoretical significance and engineering application value to put forward the seismic design suggestion. In this paper, SAP2000 finite element software is used to simulate the three kinds of coal conveyer belt used in the project, and the simulation results are given according to the simulation results. The aseismic performance of the three structures is systematically analyzed, and the following research work is done: The results show that the first three vibration modes have a great influence on the structure, but the upper part of the bridge frame has a large staggered deformation. High-order modes can not be ignored in calculation. (2) the seismic response spectrum of three bridge structures under longitudinal, horizontal, vertical and horizontal conditions is analyzed. The analysis shows that the displacement angle of the column top of the bridge structure is between 1 / 2319 / 1 / 1045. All meet the limit value of 1/550. The three pull-down suspenders of the bridge frame are more rigid than those of the triangulated web type and the lower inclined type without pull-down suspenders, so that part of the suspension is made up after adding the suspenders. The internal force of the lower chord is counteracted and the deflection of the bridge is reduced. 3) the elastic time history analysis of three bridge structures under seismic action is made, and the results are compared with the results of response spectrum analysis. The analysis shows that the stiffness of the end portal frame should be paid attention to in this kind of long-span structure. To ensure the safety of the structure in the event of a lateral earthquake. 4) the dynamic elastoplastic time history analysis of the bridge frame is carried out, and the deformation and force of the structure under the action of octave earthquake are obtained. The nonlinear analysis results show that the frame beams and columns of the lower concrete support are in plastic state in varying degrees, and the lower end of the frame column is in the weak position. Based on the engineering examples and experiences at home and abroad, this paper puts forward some seismic suggestions through the simulation and analysis of actual structures, which provides a reference for designers to design and analyze such structures in the future.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.18

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