预压装配框架结构节点承载能力试验研究

发布时间：2018-07-20 17:13

【摘要】：预应力装配混凝土结构即用高强预应力钢筋或钢绞线通过施加预应力把预制混凝土构件在施工现场装配起来,这种结构兼有预应力混凝土和装配式结构的优点。与普通混凝土结构相比,它具有抗裂性好、挠度小、变形恢复能力强、震后结构的残余变形小的特点,能够充分利用高强混凝土材料减轻自重、工业化生产方式更加节能环保、现场湿作业少能够有效提高工作效率缩短施工工期。在课题组之前工作的基础上对不同预压应力和不同梁配筋率的预压装配式节点试件的承载力进行研究,主要选取边节点试件作为研究对象,涉及试件16个,试件均为足尺试件,对拟静力荷载作用下,试件的承载力及抗震性能进行研究。结果表明:预压应力对试件的承载力具有显著影响,在一定范围内,随着预压应力的增大,装配节点试件承载力增加明显;但梁配筋率对装配式试件承载力影响效果不显著,在一定范围内,随着配筋率的提高现浇试件承载力提高明显,但附加角钢板和附加阻尼器的装配式节点试件,承载力增加不明显。附加阻尼器试件的耗能能力较附加角钢板试件更强,预压应力的增大会降低节点试件的耗能能力,而增加梁配筋率则会增强试件的耗能能力。在一定范围内,增加试件的配筋率和预压应力有助于提高试件的整体刚度。在试验和理论计算的基础上,对节点的整体性能进行分析,建议采用混凝土设计规范中相关内容对预制梁柱节点试件进行计算,计算结果与实际值相符合。文中设计的附加角钢板和附加阻尼器耗能装置,能够在一定程度上增加节点试件的抗震性能,可以在工程实际中进行推广使用。
[Abstract]:Prestressed assembly concrete structure is that prefabricated concrete members are assembled in the construction site by applying prestressing force with high strength prestressed steel bar or steel strand. This kind of structure has the advantages of both prestressed concrete and prefabricated structure. Compared with ordinary concrete structure, it has the characteristics of good crack resistance, small deflection, strong deformation recovery ability and small residual deformation of post-earthquake structure. It can make full use of high-strength concrete materials to reduce self-weight, and the industrial production mode is more energy saving and environmental protection. Less wet work on site can effectively improve the working efficiency and shorten the construction period. On the basis of the work done before the research group, the bearing capacity of the preloaded fabricated joint specimens with different precompression stress and different beam reinforcement ratio was studied. The edge joint specimens were selected as the research objects, 16 specimens were involved, and all the specimens were full-scale specimens. The bearing capacity and seismic behavior of the specimen under pseudo static load are studied. The results show that the preloading stress has a significant effect on the bearing capacity of the specimen. In a certain range, with the increase of preloading stress, the bearing capacity of the assembly joint specimen increases obviously, but the effect of beam reinforcement ratio on the bearing capacity of the assembled specimen is not significant. In a certain range, the bearing capacity of cast-in-situ specimens increases obviously with the increase of reinforcement ratio, but the bearing capacity of fabricated joint specimens with angle steel plates and dampers is not obviously increased. The energy dissipation capacity of the specimens with additional dampers is stronger than that of the steel plate specimens with additional angles. The increase of preloading stress will reduce the energy dissipation capacity of the joint specimens, while the energy dissipation capacity of the specimens will be enhanced by increasing the reinforcement ratio of the beams. In a certain range, increasing the reinforcement ratio and preloading stress will help to improve the overall stiffness of the specimen. On the basis of experiment and theoretical calculation, the whole performance of the joints is analyzed, and it is suggested that the precast Liang Zhu joints should be calculated by using the relevant contents of the concrete design code. The calculated results are in accordance with the actual values. The additional angle steel plate and the additional damper energy dissipation device designed in this paper can increase the seismic performance of the joint specimen to a certain extent and can be popularized and used in engineering practice.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU378.4

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