新型榫卯式满堂支撑体系承载性能研究
发布时间：2019-01-07 09:20
【摘要】：随着我国经济的快速发展,城市建设及公共基础设施的建设进入了一个高峰期,结构向着更高、跨度更大的方向发展;为施工提供支承或操作平台的脚手架的搭设要求也会向着高度更高、跨度更大的方向发展。目前,尽管脚手架类型很多,可以说是应有尽有,然而工程安全事故却频频发生,尤其是脚手架承载体系倒塌事故最为常见。因此,寻求一种更为合理、安全、经济的脚手架承载体系成为大众呼声。本文介绍了采用古代木结构中最常见的榫卯连接的新型脚手架承载体系(榫卯式满堂支承体系)。榫卯式脚手架目前在国内还没有工程应用实例,也没有相关的试验研究,但是其结构体系施工操作速度快、周转寿命长、适用性强、整体刚度大、承载力高等优点使其具有广泛的应用价值,为了推广应用就需要相关整体试验及局部试验。针对该榫卯式满堂支承体系的承载性能,本文主要完成了以下几个方面的工作:(1)完成了11套高度超过8m的榫卯式满堂支承体系的竖向承载能力试验,研究了立杆间距、横杆步距、剪刀撑对承载能力的影响。(2)分析了各测点位移随荷载的变化规律,据此说明了榫卯支撑体系整体失稳的模式并利用了位移变化规律确定了有限元整体计算模型边界条件。(3)采用节点半刚性理论建立了11套架体的有限元模型,应用非线性后屈曲分析手段获得了试验架体各测点荷载—位移曲线并确定了体系竖向极限承载力;与试验结果对比,发现有限元模拟结果和试验结果基本吻合,从而验证了有限元模型的合理性及适用性。(4)对榫卯式节点的可靠性做了试验研究,包括节点半刚性试验、节点抗剪试验、节点弯剪试验、节点抗拉试验,试验结果都验证了榫卯式节点的合理性及连接的可靠性。(5)建立了考虑面间正向作用及切向作用(接触分析)的三维实体模型,这种模型能够精确反映节点的实际工作状态;模拟结果和试验规律一致,更进一步验证了这种榫卯式新型节点的合理性及连接的可靠性。以上几个方面的研究包括试验研究及有限元分析,由此得出的相关结论既可指导该支撑体系的企业或者行业规范的编写又可指导该新型支撑体系在工程中的应用。
[Abstract]:With the rapid development of our economy, the construction of urban construction and public infrastructure has entered a peak period, and the structure is developing in the direction of higher and larger span. Scaffolding, which provides support or operating platform for construction, will also develop towards higher height and larger span. At present, although there are many types of scaffolding, it can be said that there are all kinds of scaffolding, but engineering safety accidents occur frequently, especially the collapse of scaffolding bearing system is the most common. Therefore, the search for a more reasonable, safe, economic scaffolding carrying system has become the voice of the public. In this paper, a new type of scaffold bearing system (mortise and tenon full support system) with tenon and joint is introduced. Tenon and mortise scaffolding has not been applied in China, nor has it been tested. However, the structure system has the advantages of fast construction operation speed, long turnover life, strong applicability and large overall stiffness. Because of its high bearing capacity, it has wide application value. In order to popularize its application, it needs relevant whole test and local test. In view of the bearing capacity of the tenon and mortise full hall support system, this paper mainly completes the following aspects: (1) the vertical bearing capacity tests of 11 tenon and tenon full support systems with height over 8 m have been completed, and the vertical stand spacing has been studied. The influence of walking distance and scissors bracing on the bearing capacity is analyzed. (2) the variation of displacement with load at each measuring point is analyzed. According to this, the mode of the whole instability of the tenon and joint bracing system is explained, and the boundary conditions of the finite element integral calculation model are determined by using the law of displacement. (3) the finite element model of 11 sets of frames is established by using the theory of joint semi-rigidity. By means of nonlinear post-buckling analysis, the load-displacement curves of each measuring point of the test frame are obtained and the vertical ultimate bearing capacity of the system is determined. Compared with the test results, it is found that the finite element simulation results are in good agreement with the test results, which verifies the rationality and applicability of the finite element model. (4) the reliability of the tenon joint is studied experimentally, including the semi-rigid joint test. Joint shear test, joint bending shear test, joint tensile test, The test results verify the rationality of the joint and the reliability of the connection. (5) A three-dimensional solid model considering the forward and tangential interaction between planes (contact analysis) is established. This model can accurately reflect the actual working state of nodes. The simulation results are consistent with the experimental results, which further verify the rationality and reliability of the new joint. The above studies include experimental research and finite element analysis. The conclusions can be used to guide the enterprise or industry specification of the support system as well as the application of the new support system in engineering.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU366.2;TU731.2
[Abstract]:With the rapid development of our economy, the construction of urban construction and public infrastructure has entered a peak period, and the structure is developing in the direction of higher and larger span. Scaffolding, which provides support or operating platform for construction, will also develop towards higher height and larger span. At present, although there are many types of scaffolding, it can be said that there are all kinds of scaffolding, but engineering safety accidents occur frequently, especially the collapse of scaffolding bearing system is the most common. Therefore, the search for a more reasonable, safe, economic scaffolding carrying system has become the voice of the public. In this paper, a new type of scaffold bearing system (mortise and tenon full support system) with tenon and joint is introduced. Tenon and mortise scaffolding has not been applied in China, nor has it been tested. However, the structure system has the advantages of fast construction operation speed, long turnover life, strong applicability and large overall stiffness. Because of its high bearing capacity, it has wide application value. In order to popularize its application, it needs relevant whole test and local test. In view of the bearing capacity of the tenon and mortise full hall support system, this paper mainly completes the following aspects: (1) the vertical bearing capacity tests of 11 tenon and tenon full support systems with height over 8 m have been completed, and the vertical stand spacing has been studied. The influence of walking distance and scissors bracing on the bearing capacity is analyzed. (2) the variation of displacement with load at each measuring point is analyzed. According to this, the mode of the whole instability of the tenon and joint bracing system is explained, and the boundary conditions of the finite element integral calculation model are determined by using the law of displacement. (3) the finite element model of 11 sets of frames is established by using the theory of joint semi-rigidity. By means of nonlinear post-buckling analysis, the load-displacement curves of each measuring point of the test frame are obtained and the vertical ultimate bearing capacity of the system is determined. Compared with the test results, it is found that the finite element simulation results are in good agreement with the test results, which verifies the rationality and applicability of the finite element model. (4) the reliability of the tenon joint is studied experimentally, including the semi-rigid joint test. Joint shear test, joint bending shear test, joint tensile test, The test results verify the rationality of the joint and the reliability of the connection. (5) A three-dimensional solid model considering the forward and tangential interaction between planes (contact analysis) is established. This model can accurately reflect the actual working state of nodes. The simulation results are consistent with the experimental results, which further verify the rationality and reliability of the new joint. The above studies include experimental research and finite element analysis. The conclusions can be used to guide the enterprise or industry specification of the support system as well as the application of the new support system in engineering.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU366.2;TU731.2
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