节段预制体外预应力干接缝混凝土梁桥模型试验研究

发布时间：2018-05-01 09:09

本文选题：模型试验 + 体外预应力　；参考：《广东工业大学》2014年硕士论文

【摘要】：节段预制式体外预应力混凝土梁桥相对整体预制式体内预应力混凝土梁桥,具有比较突出的优势,在国外已有不少的工程实例,在我国一些大桥的引桥和轨道交通桥梁中也逐渐被采用。已有的国内外研究结果表明,混合配束节段梁的抗弯承载力和延性比全体外配束的节段梁要好,体内束能抑制接缝的张开和裂缝的发展,进而提高节段梁的抗剪承载力。但先前的研究没有针对体内束是无粘结预应力束且混合配束的干接缝节段梁试验研究,为了促进混合配束节段预制混凝土桥梁的应用,本文在总结分析国内外对节段预制体外预应力混凝土梁的相关研究成果的基础上,依托广州市科技计划项目(2008J1-C201)“体外预应力节段施工新技术研究”,通过理论分析比较、模型试验和简化计算方法的验算对比这三方面对节段预制混合配束体内无粘结预应力干接缝混凝土梁的力学性能进行研究,主要研究内容包括以下三个方面： (1)分析节段预制体外预应力混凝土梁的基本力学性能,总结归纳国内外规范及学者针对节段预制体外预应力混凝土梁的抗弯和抗剪计算提出的简化计算方法,指出各种简化计算方法的优缺点。 (2)以施工方法、体内体外预应力筋配比、剪跨比为试验参数,进行5根节段预制体外预应力混凝土梁的缩尺模型试验,分析以上参数对节段预制体外预应力混凝土梁的裂缝状况、挠度变化和破坏模式等的影响,系统总结节段预制体外预应力干接缝混凝土梁的受力性能和破坏机理,提供建立和验证简化计算方法的试验依据。 (3)利用试验数据比较计算已有的并具代表性的规范公式和简化计算方法,为节段预制体外预应力混凝土梁在承载能力极限状态下的简化计算提供初步规律。
[Abstract]:The segmental prefabricated externally prestressed concrete beam bridge has a relatively prominent advantage over the whole prefabricated prestressed concrete beam bridge. There are many engineering examples abroad, which are also gradually adopted in the bridge and rail traffic bridge of some bridges in our country. The existing research results at home and abroad show that the resistance of the mixed beam joint section beam is resistant. The flexural capacity and ductility are better than that of the segmental beams that are bundled all in vitro. The bundles in the body can inhibit the opening of the joints and the development of the cracks, and thus improve the shear bearing capacity of the segmental beams. However, the previous study did not focus on the dry joint segment beam test of the unbonded tendons and mixed bundles in the body, in order to promote the mixing section prefabrication. The application of concrete bridge is on the basis of summarizing and analyzing the related research results of segmental prefabricated prestressed concrete beams, and relying on the Guangzhou science and technology project project (2008J1-C201) "new technology research on the construction of external prestressed segment construction". Through theoretical analysis and comparison, the comparison between model test and simplified calculation method is compared. In these three aspects, the mechanical properties of the unbonded prestressed dry joint concrete beams in the segmental prefabricated mixed bundles are studied. The main contents include the following three aspects:
(1) the basic mechanical properties of segmental prefabricated external prestressed concrete beams are analyzed, and the simplified calculation methods for calculation of bending and shear resistance of prestressed concrete beams of segmental prefabricated prestressed concrete beams are summarized and summarized, and the advantages and disadvantages of various simplified methods are pointed out.
(2) based on the construction method, the ratio of prestressing tendons in body and body, and the shear span ratio as the test parameters, the scale model test of 5 segmental prefabricated prestressed concrete beams is carried out, and the effects of the above parameters on the crack status, deflection and breaking mode of the prefabricated concrete beams prefabricated in the segment are analyzed, and the prefabricated pre pre stress of the segmental prefabricated prestressed concrete beams is systematically summarized. The mechanical behavior and failure mechanism of the force dry joint concrete beam provide the experimental basis for establishing and verifying the simplified calculation method.
(3) using the experimental data to compare and calculate the existing and representative standard formulas and simplified calculation methods, it provides a preliminary rule for simplified calculation of prefabricated prestressed concrete beams under the limit state of bearing capacity.

【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.35;U446

【参考文献】