横系梁设置对双柱墩抗震性能的影响分析

发布时间：2018-03-14 20:37

本文选题：双柱墩　切入点：横系梁　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：在已建和在建的桥梁结构中,预制T梁和预制小箱梁,以其独特的优势(如施工工期较短,预制工厂的设备先进使其质量有保证,受施工现场环境的影响小等),得到了广泛的应用。与预制梁结构配合使用的下部结构通常采用的是单柱墩、双柱墩以及多柱墩。对于双柱墩与多柱墩,当墩柱超过一定的高度时,一般会在墩柱中设置横系梁,以增加墩柱的整体性与稳定性。然而,横系梁的设置对双柱墩的抗震性能的影响却没有一致的结论,对其研究也比较少。有人认为设置横系梁有助于双柱墩的抗震,因为增加横系梁会增加双柱墩的抗推刚度,提高结构的承载力。有的人认为设置横系梁对双柱墩抗震不利,因为会降低结构的位移延性,而且在地震中,一些桥墩的弯剪破坏就发生在系梁与双柱墩相交的位置。系梁设置对于抗震,是有利还是不利,本文通过SAP2000,进行了双柱墩的Pushover分析。本文采用纤维单元模型对结构的抗力、位移延性、内力等进行了分析,以探讨系梁设置对双柱墩抗震性能的影响和系梁的合理设置方案。本文具体进行了如下的计算分析:①对比有系梁与无系梁双柱墩,分析系梁的设置将对双柱墩的承载力、位移延性、内力等产生怎样的影响。横系梁的合理截面尺寸的异同。②在双柱墩墩中设置一道系梁,改变系梁设置的位置。寻找一道系梁设置的②在双柱墩墩中设置一道系梁,改变系梁设置的位置。寻找一道系梁设置的合理位置。③在双柱墩墩中设置一道系梁,改变系梁的截面尺寸,得出一道系梁的合理截面尺寸。④在墩柱中设置两道横系梁,改变系梁的截面尺寸,探讨系梁的合理截面尺寸。并讨论设置一道与两道横系梁的合理截面尺寸的异同。⑤通过比较不设横系梁、设置一道横系梁、设置两道横系梁的双柱墩模型计算结果,讨论系梁设置道数对双柱墩抗震性能的影响。
[Abstract]:Among the bridge structures under construction, prefabricated T-beams and prefabricated small box girders have their unique advantages (such as short construction period, advanced equipment in the prefabricated plants to ensure their quality, etc.). The substructure used with precast beam structure is usually single column pier, double column pier and multi-column pier. When the pier column is above a certain height, the transverse beam is generally set in the pier column to increase the integrity and stability of the pier column. However, there is no consistent conclusion that the installation of the crossbar beam affects the seismic behavior of the double-column pier. Some people think that setting crossbar beam is helpful to the earthquake resistance of double-column pier, because the increase of transverse beam will increase the pushing stiffness of double-column pier and increase the bearing capacity of structure. Some people think that setting crossbar beam is unfavorable to the aseismic resistance of double-column pier. Because it can reduce the displacement ductility of the structure, and in the earthquake, the bending and shear failure of some bridge piers occur in the position where the tie beam intersects with the double column pier. In this paper, the Pushover analysis of double column pier is carried out by SAP 2000. The resistance, displacement ductility and internal force of the structure are analyzed by fiber element model. In order to discuss the influence of the installation of the tie beam on the seismic behavior of the double column pier and the reasonable arrangement scheme of the tie beam, the following calculation and analysis are carried out in this paper. The bearing capacity of the double column pier will be analyzed by comparing the tied beam with the non-tied beam double column pier by using the following calculation and analysis in this paper. What is the influence of displacement ductility, internal force, etc. The differences and similarities of the reasonable section dimensions of the transverse tie beam are as follows: 2. A tie beam is arranged in the double column pier to change the position of the tie beam, and a tie beam is set in the double column pier. Change the position of the tie beam. 3. Find the reasonable position of a tie beam. .3 set a tie beam in the pier of double column pier, change the cross section size of the tie beam, and get the reasonable section size of a tie beam. 4. Set two transverse tie beams in the pier column. By changing the cross section size of the tie beam, the reasonable section size of the tie beam is discussed, and the similarities and differences between the reasonable section size of one beam and that of the two transverse tie beams are discussed. The calculation results of double column pier model with two beams are discussed. The influence of the number of track on the aseismic performance of double column pier is discussed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

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