安装缺陷对螺栓球节点及其杆件受力性能影响研究
发布时间：2018-11-08 07:43
【摘要】：螺栓球节点是大跨空间结构中最为常用的节点形式之一,具有工厂化生产、安装速度快等一系列优点。但是,由于螺栓球节点组成构件较多,且各构件在加工过程中可能存在偏差,使得节点在安装过程中容易出现诸多施工缺陷,如高强螺栓拧入长度不足和安装偏心等。这些缺陷对节点及其连接杆件的力学性能带来了不利影响。因此,对安装缺陷下的螺栓球节点及其连接杆件受力性能进行研究,可以更好的认识和评估该类结构的安全状态,具有重要的工程参考意义。基于此,针对螺栓球节点及其连接杆件在安装缺陷下的受力性能,开展了如下研究工作:1、螺栓拧入不足对螺栓球节点受弯性能影响研究基于ANSYS平台建立了带有螺纹的螺栓球节点精细化有限元模型,通过改变螺纹的啮合个数模拟螺栓的拧入长度变化;利用已有试验数据对模拟方法进行了验证。在此基础上,对M20、M24、M27三种常用节点在不同拧入长度下的受弯性能进行模拟研究,获得了不同状况下的节点弯矩-转角曲线、初始转动刚度和极限弯矩,并得到了各指标与螺栓拧入长度之间的变化规律,给出了不同拧入长度下的节点受弯工作模式及破坏机理。2、螺栓拧入不足对螺栓球节点受拉性能影响研究详细设计并完成了M20、M24、M27三种节点在螺栓拧入长度不足下的受拉性能试验,对试验现象及关键部位的变形情况进行了详细分析,获得了不同拧入长度下的节点荷载-位移曲线和受拉承载力。分析总结出了螺栓球节点的受拉工作模式及破坏机理,给出了节点受拉承载力与拧入长度之间的变化规律;最后采用精细化模型对试验进行模拟分析,并将模拟结果与试验进行对比,验证了模拟方法的准确性。研究可为相似结构的受拉性能分析和安全性能评估提供技术参考。3、安装偏心对螺栓球节点及其杆件受压稳定性能影响研究为了考察安装偏心对节点及其连接杆件受压稳定性能的影响,对安装偏心下的节点杆件受压性能进行了试验研究,精确测量了试验构件的初始弯曲情况,通过工程调研确定了安装偏心的控制范围,完成了M20、M24、M27三种节点在不同程度安装偏心下的受压稳定性能试验,总结出了节点杆件的受压破坏模式,并给出了受压稳定承载力与安装偏心之间的变化规律;最后建立了足尺度的精细化有限元模型,对节点构件的受压性能试验进行模拟分析,通过模拟与试验结果的对比,验证了模拟方法的可靠性。研究可为存在安装偏心缺陷的空间钢结构承载力分析及安全性能评估提供了技术支持。
[Abstract]:Bolt ball joint is one of the most commonly used joints in long span space structure, which has a series of advantages, such as factory production, fast installation speed and so on. However, due to the large number of bolted joints and the possible deviation of each component in the process of processing, the joints are prone to many construction defects, such as insufficient length of high strength bolts and installation eccentricity and so on. These defects have a negative effect on the mechanical properties of the joints and their connecting members. Therefore, the study on the mechanical behavior of the bolted ball joints and their connecting members under the installation defects can better understand and evaluate the safety state of this kind of structures, which has important engineering reference significance. Based on this, the following research work has been carried out in view of the mechanical behavior of the bolted ball joints and their connecting members under the installation defects: 1. Research on the influence of insufficient Bolt on the bending performance of Bolt Ball joints; based on the ANSYS platform, a fine finite element model of bolt joints with thread is established, and the screw length change is simulated by changing the number of thread meshing. The simulation method is verified by the existing experimental data. On this basis, the bending behavior of three common joints M20M24M27 under different twisting lengths is simulated and studied. The moment angle curve, initial rotational stiffness and ultimate bending moment of the joints under different conditions are obtained. The variation law between each index and bolt length is obtained, and the bending mode and failure mechanism of joint under different screw length are given. 2. Study on the effect of insufficient Bolt twisting on the tensile performance of Bolt Ball joints; the tensile performance tests of M20M24M27 joints with insufficient bolt screw length are designed and completed in detail. The experimental phenomena and the deformation of the key parts are analyzed in detail, and the load-displacement curves and tensile capacity of the joints with different screw lengths are obtained. The tensile working mode and failure mechanism of the bolt ball joint are analyzed and summarized, and the variation law between the tensile bearing capacity and the screw in length of the joint is given. Finally, the precision model is used to simulate and analyze the experiment, and the simulation results are compared with the experiment to verify the accuracy of the simulation method. The research can provide technical reference for tensile performance analysis and safety performance evaluation of similar structures. Effect of installation eccentricity on compressive Stability of Bolt spherical joints and their members in order to investigate the effect of installation eccentricity on the compressive stability of joints and their connecting members, the compression performance of joints under eccentric installation is studied experimentally. The initial bending condition of test members was measured accurately, the control range of installation eccentricity was determined by engineering investigation, and the compression stability tests of M20M24M27 joints under different degrees of eccentricity were completed. The compressive failure mode of the joint member is summarized, and the variation law between the compressive stability bearing capacity and the installation eccentricity is given. At last, a finer finite element model of sufficient scale is established, and the compression performance test of the joint member is simulated and analyzed. The reliability of the simulation method is verified by comparing the simulation results with the test results. The research can provide technical support for bearing capacity analysis and safety performance evaluation of space steel structures with eccentric installation defects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU758.11
本文编号：2317830
[Abstract]:Bolt ball joint is one of the most commonly used joints in long span space structure, which has a series of advantages, such as factory production, fast installation speed and so on. However, due to the large number of bolted joints and the possible deviation of each component in the process of processing, the joints are prone to many construction defects, such as insufficient length of high strength bolts and installation eccentricity and so on. These defects have a negative effect on the mechanical properties of the joints and their connecting members. Therefore, the study on the mechanical behavior of the bolted ball joints and their connecting members under the installation defects can better understand and evaluate the safety state of this kind of structures, which has important engineering reference significance. Based on this, the following research work has been carried out in view of the mechanical behavior of the bolted ball joints and their connecting members under the installation defects: 1. Research on the influence of insufficient Bolt on the bending performance of Bolt Ball joints; based on the ANSYS platform, a fine finite element model of bolt joints with thread is established, and the screw length change is simulated by changing the number of thread meshing. The simulation method is verified by the existing experimental data. On this basis, the bending behavior of three common joints M20M24M27 under different twisting lengths is simulated and studied. The moment angle curve, initial rotational stiffness and ultimate bending moment of the joints under different conditions are obtained. The variation law between each index and bolt length is obtained, and the bending mode and failure mechanism of joint under different screw length are given. 2. Study on the effect of insufficient Bolt twisting on the tensile performance of Bolt Ball joints; the tensile performance tests of M20M24M27 joints with insufficient bolt screw length are designed and completed in detail. The experimental phenomena and the deformation of the key parts are analyzed in detail, and the load-displacement curves and tensile capacity of the joints with different screw lengths are obtained. The tensile working mode and failure mechanism of the bolt ball joint are analyzed and summarized, and the variation law between the tensile bearing capacity and the screw in length of the joint is given. Finally, the precision model is used to simulate and analyze the experiment, and the simulation results are compared with the experiment to verify the accuracy of the simulation method. The research can provide technical reference for tensile performance analysis and safety performance evaluation of similar structures. Effect of installation eccentricity on compressive Stability of Bolt spherical joints and their members in order to investigate the effect of installation eccentricity on the compressive stability of joints and their connecting members, the compression performance of joints under eccentric installation is studied experimentally. The initial bending condition of test members was measured accurately, the control range of installation eccentricity was determined by engineering investigation, and the compression stability tests of M20M24M27 joints under different degrees of eccentricity were completed. The compressive failure mode of the joint member is summarized, and the variation law between the compressive stability bearing capacity and the installation eccentricity is given. At last, a finer finite element model of sufficient scale is established, and the compression performance test of the joint member is simulated and analyzed. The reliability of the simulation method is verified by comparing the simulation results with the test results. The research can provide technical support for bearing capacity analysis and safety performance evaluation of space steel structures with eccentric installation defects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU758.11
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