钢锚箱式钢—混组合索塔锚固体系受力性能与设计方法研究

发布时间：2018-07-06 16:38

本文选题：钢锚箱式钢-混组合索塔锚固体系 + 钢锚箱节段间连接方式　；参考：《长安大学》2015年博士论文

【摘要】：本文以内置和外露钢锚箱式索塔锚固体系为研究对象,通过建立精细化有限元模型和简化框架分析方法,对锚固体系的受力性能和设计方法进行系统的研究,以推动该结构在我国的推广应用,本文的主要研究内容如下:考虑钢锚箱节段之间连接与不连接两种方式,采用有限元方法,研究钢锚箱节段间的连接方式对多节段内置与外露钢锚箱索塔锚固体系受力特性及索力分配方式的影响。结果显示,钢锚箱之间的连接可以更好的实现钢锚箱各板件的应力扩散,与钢锚箱不连接体系相比,钢锚箱连接体系各构件应力分布和栓钉群剪力分布更加均匀;连接方式对索力在节段间的分配无明显影响,而对节段内各构件之间的分配影响较为显著。采用有限元方法,分别对内置和外露钢锚箱式索塔锚固体系的传力机理进行了研究,得到了双侧索力及单侧换索索力作用下两种形式锚固体系的传力路径,定量分析了索力在各受力构件中的分配大小,明确了单节段索力在多节段锚固体系中的荷载传递路径与荷载分配关系。对内置和外露钢锚箱式索塔锚固体系的受力性能进行有限元对比分析,研究了两种形式锚固体系其钢锚箱各板件的应力分布规律、塔壁的裂缝开展过程以及栓钉群的剪力分布情况的异同;分析了索力在两种形式锚固体系的传递路径及分配关系的差异。采用有限元方法对锚固体系钢-混结合部栓钉剪力连接件的受力性能进行分析。通过对国内外共233个栓钉连接件推出试验数据进行回归分析,提出了栓钉连接件单钉抗剪承载力计算公式。并对群钉剪力连接件的群钉效应及其参数敏感性进行了分析,结果显示:①群钉效应将导致栓钉连接件单钉平均抗剪承载力及抗剪刚度的显著降低,栓钉之间的传力不均匀现象,也将造成栓钉轴向应力大小发生变化,但对栓钉的剪应力和弯曲应力水平及分布形式无明显影响;②随着栓钉排数的增加,单钉平均抗剪承载力及抗剪刚度逐渐减小,栓钉的传力不均匀程度提高;③当栓钉排间距由2.3倍栓钉直径增加至13.6倍栓钉直径时,单钉平均抗剪承载力先增大后减小,单钉平均抗剪刚度逐渐降低,栓钉的传力不均匀程度先降低后提高;④当群钉连接件的破坏形态为栓钉的弯剪破坏时,增大混凝土的强度等级将提高连接件的抗剪刚度以及栓钉传递荷载的不均匀程度;⑤根据计算结果给出了群钉连接件的合理布置排间距。在此基础上,提出了群钉剪力连接件抗剪承载力计算方法。结合内置和外露钢锚箱式索塔锚固体系的受力特点,根据变形协调原理,建立了锚固体系荷载分配简化计算方法;并对钢锚箱式索塔锚固体系关键构造设计进行了研究,提出了钢锚箱式索塔锚固体系的设计方法。
[Abstract]:In this paper, the anchorage system of the built-in and exposed steel anchor box type cable tower is studied. Through the establishment of finite-element model and simplified frame analysis method, the stress performance and design method of the anchorage system are systematically studied to promote the application of the structure in China. The main contents of this paper are as follows: the section of steel anchor box section is considered. The connection and non connection between two ways and the finite element method are used to study the influence of the connection mode between the steel anchor box section on the stress characteristics and the cable force distribution mode of the multi section and exposed steel anchor box cable tower anchorage system. The results show that the connection between the steel anchor boxes can better realize the stress diffusion of the steel anchor box and the steel anchor box. The distribution of stress distribution and the shear force distribution of the stud group are more uniform in the connection system of the steel anchor box, and the connection mode has no obvious influence on the distribution of the cable force between the segments, and the distribution of the components is more significant. The finite element method is used to transmit the anchorage system of the built-in and exposed steel anchor box type cable tower. The force mechanism is studied. The force transmission path of two types of anchorage systems under the action of bilateral cable force and single side cable force is obtained. The distribution of cable force in each force member is quantitatively analyzed. The relationship between load transfer path and load distribution of single segment cable force in multi segment anchorage system is clarified. The stress performance of the cable tower anchorage system is compared and analyzed by finite element method. The stress distribution law of the steel anchor box of two types of anchorage system, the process of the crack development of the tower wall and the difference of shear distribution of the stud group are studied, and the difference between the transmission path and the distribution relationship of the cable force in the two forms of the anchor solid system is analyzed. The finite element method is used to analyze the force performance of the stud shear connector in the steel mixed joint of the anchorage system. Through the regression analysis of the experimental data of 233 stud connectors at home and abroad, the formula of the shear bearing capacity of the single pin of the stud connector is put forward. The results of the analysis show that: 1. The group nail effect will lead to a significant reduction in the average shear strength and shear stiffness of the stud connector, the uneven transmission between the studs and the axial stress of the stud, but there is no obvious influence on the shear stress and the bending stress level and distribution of the studs. The average shear bearing capacity and shear stiffness of single nail decreased gradually, and the unevenness of the studs increased, and the average shear strength of the single nail first increased and then decreased when the diameter of the stud was increased from 2.3 times to 13.6 times the diameter of the stud, and the average shear stiffness of the single nail decreased gradually and the force uneven degree of the stud was not uniform. When the failure mode of the joint part is the bending and shear failure of the stud, the increase of the strength grade of the concrete will increase the shear stiffness of the connecting parts and the uneven degree of the transmission load of the studs. Based on the deformation coordination principle, the simplified calculation method of load distribution in anchorage system is established according to the deformation coordination principle, and the key structure design of the steel anchor box type cable tower anchorage system is studied, and the design of the steel anchor box type cable tower anchorage system is put forward. Law.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U448.27

【引证文献】