先简支后连续小箱梁桥荷载横向分布研究与试验分析
发布时间：2018-11-19 09:58
【摘要】：先简支后连续梁桥兼有简支梁桥和连续梁桥的优点,因此在高等级公路中,特别是中、小跨径桥梁中应用越来越广。该类桥梁设计中横向分布系数的计算方法有：修正刚性横梁法、刚接梁法、铰接梁法等传统方法和有限元分析法,传统方法简化条件较多,计算精度不高,而有限元分析法建模复杂、计算工作量大,因此开展先简支后连续小箱梁桥荷载横向分布系数计算的研究非常必要。本文以长湘高速公路金州立交桥为依托,主要研究内容如下：1.阐述了先简支后连续小箱梁桥的受力特点和国内外“荷载横向分布”的研究现状。2.采用等代简支板法将先简支后连续梁桥(金州分离式立交桥)截面刚度等效转化成简支梁桥截面刚度后,分别采用修正刚性横梁法、刚接梁法、铰接梁法计算了该桥的跨中横向分布系数。3.运用有限元软件Midas建立了金州分离式立交桥的空间梁格计算模型,分析计算了该桥的荷载横向分布系数,将计算结果与传统计算方法的结果比较可得：四跨五梁式的先简支后连续小箱梁跨中横向分布计算采用刚接梁法计算较为合适,并建议将刚接梁法的计算结果适当提高,边梁(1号梁)提高7%,2号梁提高2%,3号梁提高1%。4.进行了金州立交桥的动、静载试验,结果表明该桥的受力性能良好,满足设计规范要求；该桥于2013年12月通车,运营良好；并将试验结果与传统方法、有限元法的计算结果进行对比基本吻合,验证了基于刚度等效的传统方法和有限元分析法的正确性。
[Abstract]:The simple supported and then continuous beam bridges have the advantages of both simple supported beam bridges and continuous beam bridges, so they are more and more widely used in high grade highways, especially in medium and small span bridges. In the design of this kind of bridges, the calculation methods of transverse distribution coefficient are as follows: modified rigid beam method, hinged beam method and finite element analysis. The finite element analysis method is complex in modeling and heavy in calculation, so it is very necessary to study the calculation of load transverse distribution coefficient of simple support and then continuous small box girder bridge. Based on Jinzhou overpass of Changxiang Expressway, the main research contents are as follows: 1. This paper expounds the stress characteristics of simple supported and then continuous small box girder bridges and the research status of "transverse load distribution" at home and abroad. 2. The section stiffness of the first supported and then continuous beam bridge (Jinzhou separated interchange bridge) is equivalent to the section stiffness of simply supported beam bridge by the method of equal-generation simply supported plate, and the modified rigid crossbeam method and the rigid-connected beam method are adopted respectively after the section stiffness of the bridge is transformed into the section stiffness of the simple supported beam bridge. The transverse distribution coefficient in the span of the bridge is calculated by hinge beam method. 3. 3. By using finite element software Midas, the spatial beam lattice calculation model of Jinzhou separated interchange bridge is established, and the load transverse distribution coefficient of the bridge is analyzed and calculated. By comparing the calculation results with those of the traditional method, it can be concluded that the method of rigid connection beam is more suitable for the calculation of transverse distribution of four-span and five-beam box girders with simple support and continuous small box girders, and it is suggested that the calculation results of rigid-connected beam method should be improved appropriately. The side beam (beam 1) increased by 7, the second beam increased by 2, and the third beam increased by 1. 4. The dynamic and static load tests of Jinzhou overpass are carried out. The results show that the bridge has good mechanical performance and meets the requirements of the design code, and the bridge was opened to traffic in December 2013 and operated well. The experimental results are compared with those of the traditional method and the finite element method, which verify the correctness of the traditional method based on stiffness equivalence and the finite element analysis method.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.2;U448.213
，
本文编号：2341948
[Abstract]:The simple supported and then continuous beam bridges have the advantages of both simple supported beam bridges and continuous beam bridges, so they are more and more widely used in high grade highways, especially in medium and small span bridges. In the design of this kind of bridges, the calculation methods of transverse distribution coefficient are as follows: modified rigid beam method, hinged beam method and finite element analysis. The finite element analysis method is complex in modeling and heavy in calculation, so it is very necessary to study the calculation of load transverse distribution coefficient of simple support and then continuous small box girder bridge. Based on Jinzhou overpass of Changxiang Expressway, the main research contents are as follows: 1. This paper expounds the stress characteristics of simple supported and then continuous small box girder bridges and the research status of "transverse load distribution" at home and abroad. 2. The section stiffness of the first supported and then continuous beam bridge (Jinzhou separated interchange bridge) is equivalent to the section stiffness of simply supported beam bridge by the method of equal-generation simply supported plate, and the modified rigid crossbeam method and the rigid-connected beam method are adopted respectively after the section stiffness of the bridge is transformed into the section stiffness of the simple supported beam bridge. The transverse distribution coefficient in the span of the bridge is calculated by hinge beam method. 3. 3. By using finite element software Midas, the spatial beam lattice calculation model of Jinzhou separated interchange bridge is established, and the load transverse distribution coefficient of the bridge is analyzed and calculated. By comparing the calculation results with those of the traditional method, it can be concluded that the method of rigid connection beam is more suitable for the calculation of transverse distribution of four-span and five-beam box girders with simple support and continuous small box girders, and it is suggested that the calculation results of rigid-connected beam method should be improved appropriately. The side beam (beam 1) increased by 7, the second beam increased by 2, and the third beam increased by 1. 4. The dynamic and static load tests of Jinzhou overpass are carried out. The results show that the bridge has good mechanical performance and meets the requirements of the design code, and the bridge was opened to traffic in December 2013 and operated well. The experimental results are compared with those of the traditional method and the finite element method, which verify the correctness of the traditional method based on stiffness equivalence and the finite element analysis method.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.2;U448.213
，
本文编号：2341948
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