采动区新型自伸长支座的研发及应用研究
发布时间：2018-10-26 18:52
【摘要】：随着地下资源的大规模开采以及各种地下工程的兴建等,地表变形对上部建筑结构的危害不容忽视,传统的抗变形保护措施采用提高整体结构刚度或者被动保护措施等,不经济且无法从根本上消除地表变形,因此提出新型建筑结构的抗变形措施具有重要意义。故本文研发了一种新型自伸长支座装置抵抗竖向不均匀沉降变形,通过试验研究和有限元模拟的方法对其性能进行了研究,并对支座装置的设计和使用提出了改进意见,本文的主要研究内容和结论如下:首先研发了新型自伸长支座装置。引用摩擦自锁原理,研发的支座装置由外套筒、楔形块、内筒组成,外套筒和基础连接,内筒与框架柱脚相连,该装置可以感应到地表不均匀沉降,发生自伸长,使上部结构处于同一水平面,有效减少地基不均匀沉降的破坏作用,增强结构可靠性。根据实际工程资料设计了支座尺寸,并加工、制作了该支座装置。通过力学试验研究了新型自伸长支座装置的自伸长特性和承载能力。试验表明:其自伸长特性在满足一定条件下可以实现,即基础和外套筒向下的重力大于外套筒所受的向上的摩擦力,向下运动伸长,而且支座装置伸长自锁后也能满足承载力要求。支座装置具有良好的承载能力,可以满足设计要求,破坏状态为延性破坏。为提高支座的承载力和刚度,提出加厚外套筒内壁的建议。对新型自伸长支座装置进行了ABAQUS有限元建模与分析。分析了支座在垂直偏心荷载作用下的承载性能、各个部件的受力状况与工作原理,并将模拟结果与试验结果进行对比,探讨采用数值模拟方法对该支座工作性能进行分析研究的可行性。结果表明:支座的各个部件设置合理;破坏均体现在外套筒内壁屈服和混凝土拉裂,两者整体趋势非常吻合;表明可以采用有限元模拟的方法对新型自伸长支座装置的性能进行分析。采用SAP2000有限元分析了支座装置与钢框架协同作用性能。建立了带支座钢框架和普通钢框架有限元模型,进行了竖向正、负曲率,倾斜变形三种导致基础不均匀沉降的模拟。支座模型简化为缝单元,模拟支座在结构中受力特性。通过对两类框架在竖向地表变形下,柱、基础沉降差变化和结构上部附加内力的变化规律的对比,得出支座在地表不均匀沉降中具有优良的自伸长机械性能,及减弱上部结构不利内力的良好效果。本文研究验证了自伸长支座装置是新型的、便捷的、有效的一种建筑物抗变形保护装置。因此论文最后对上述研究内容和成果做了简单的总结,并展望了进一步研究的方向和需要进行的工作,希望以后可以完善支座装置并且能够运用到实际当中。
[Abstract]:With the large-scale exploitation of underground resources and the construction of various underground projects, the damage of surface deformation to the superstructure can not be ignored. The traditional anti-deformation protection measures include improving the stiffness of the whole structure or passive protection measures, etc. Therefore, it is of great significance to put forward anti-deformation measures for new building structures. In this paper, a new type of self-elongation support is developed to resist the vertical uneven settlement, and its performance is studied by means of experimental research and finite element simulation, and some suggestions for improving the design and application of the support are put forward. The main research contents and conclusions are as follows: firstly, a new self-elongation support device is developed. According to the principle of friction self-locking, the developed support device is composed of outer sleeve, wedge block, inner cylinder, outer sleeve and foundation connection. The inner cylinder is connected to the foot of frame column. The superstructure is located in the same horizontal plane, which can effectively reduce the failure of uneven settlement of the foundation and enhance the reliability of the structure. According to the actual engineering data, the support size is designed and processed, and the support device is made. The self-elongation characteristics and bearing capacity of the new self-elongation support are studied by mechanical tests. The test results show that the self-elongation characteristics can be realized under certain conditions, that is, the downward gravity of the foundation and the outer sleeve is greater than the upward friction force of the outer sleeve, and the downward motion is elongated. And the bearing device can also meet the bearing capacity requirement after elongation self-locking. Bearing device has good bearing capacity, can meet the design requirements, the failure state is ductile failure. In order to improve the bearing capacity and stiffness of the bearing, the suggestion of thickening the inner wall of the outer sleeve is put forward. The ABAQUS finite element modeling and analysis of the new self-elongation support is carried out. The bearing capacity of the bearing under the action of vertical eccentric load, the stress condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results. The feasibility of using numerical simulation method to analyze and study the working performance of the bearing is discussed. The results show that the components of the bearing are reasonable, the failure reflects the yield of the inner wall of the outer sleeve and the crack of concrete, and the overall trend of the two is very consistent. It shows that the performance of the new self-elongation support can be analyzed by finite element simulation. The SAP2000 finite element method is used to analyze the synergistic action between the support device and the steel frame. The finite element models of steel frame with bearing and common steel frame are established, and the vertical positive curvature, negative curvature and inclined deformation are simulated to result in uneven settlement of foundation. The support model is simplified as a joint element to simulate the bearing force characteristics in the structure. By comparing the variation of column, foundation settlement difference and the additional internal force in the upper part of the structure under vertical ground deformation of the two kinds of frames, it is concluded that the bearing has excellent self-elongation mechanical performance in the uneven settlement of the ground surface. And the good effect of reducing the unfavorable internal force of the superstructure. In this paper, it is proved that the self-elongation support is a new, convenient and effective building anti-deformation protective device. In the end, the paper makes a brief summary of the above research contents and results, and looks forward to the direction of further research and the work that needs to be carried out. It is hoped that the pedestal device can be perfected and applied to practice in the future.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
[Abstract]:With the large-scale exploitation of underground resources and the construction of various underground projects, the damage of surface deformation to the superstructure can not be ignored. The traditional anti-deformation protection measures include improving the stiffness of the whole structure or passive protection measures, etc. Therefore, it is of great significance to put forward anti-deformation measures for new building structures. In this paper, a new type of self-elongation support is developed to resist the vertical uneven settlement, and its performance is studied by means of experimental research and finite element simulation, and some suggestions for improving the design and application of the support are put forward. The main research contents and conclusions are as follows: firstly, a new self-elongation support device is developed. According to the principle of friction self-locking, the developed support device is composed of outer sleeve, wedge block, inner cylinder, outer sleeve and foundation connection. The inner cylinder is connected to the foot of frame column. The superstructure is located in the same horizontal plane, which can effectively reduce the failure of uneven settlement of the foundation and enhance the reliability of the structure. According to the actual engineering data, the support size is designed and processed, and the support device is made. The self-elongation characteristics and bearing capacity of the new self-elongation support are studied by mechanical tests. The test results show that the self-elongation characteristics can be realized under certain conditions, that is, the downward gravity of the foundation and the outer sleeve is greater than the upward friction force of the outer sleeve, and the downward motion is elongated. And the bearing device can also meet the bearing capacity requirement after elongation self-locking. Bearing device has good bearing capacity, can meet the design requirements, the failure state is ductile failure. In order to improve the bearing capacity and stiffness of the bearing, the suggestion of thickening the inner wall of the outer sleeve is put forward. The ABAQUS finite element modeling and analysis of the new self-elongation support is carried out. The bearing capacity of the bearing under the action of vertical eccentric load, the stress condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results. The feasibility of using numerical simulation method to analyze and study the working performance of the bearing is discussed. The results show that the components of the bearing are reasonable, the failure reflects the yield of the inner wall of the outer sleeve and the crack of concrete, and the overall trend of the two is very consistent. It shows that the performance of the new self-elongation support can be analyzed by finite element simulation. The SAP2000 finite element method is used to analyze the synergistic action between the support device and the steel frame. The finite element models of steel frame with bearing and common steel frame are established, and the vertical positive curvature, negative curvature and inclined deformation are simulated to result in uneven settlement of foundation. The support model is simplified as a joint element to simulate the bearing force characteristics in the structure. By comparing the variation of column, foundation settlement difference and the additional internal force in the upper part of the structure under vertical ground deformation of the two kinds of frames, it is concluded that the bearing has excellent self-elongation mechanical performance in the uneven settlement of the ground surface. And the good effect of reducing the unfavorable internal force of the superstructure. In this paper, it is proved that the self-elongation support is a new, convenient and effective building anti-deformation protective device. In the end, the paper makes a brief summary of the above research contents and results, and looks forward to the direction of further research and the work that needs to be carried out. It is hoped that the pedestal device can be perfected and applied to practice in the future.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
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