新型双壁多钉连接装配式钢保温筒仓受力性能试验研究
发布时间：2018-08-21 13:33
【摘要】：筒仓作为粮食存储的主要工具，在粮食存储领域发挥着重要作用。自从20世纪中期引入我国就得到越来越广泛的应用。然而，我国的钢筒仓在很多方面还不够成熟，尚待深入研究。 本文首先按照既定卸料方式开展了一个双壁钢筒仓的卸料试验，通过对试验现象的观察与分析，得出各卸料方式的卸料特点和卸料原理；其次，对试验数据进行研究分析，得出了各方式卸料过程中筒仓内壁的侧压力分布形式以及动态特性；再次，进行偏心卸料荷载加载方式以及ANSYS仿真分析的研究，通过对比实测与理论计算数值，验证加载方案的准确性，通过分析ANSYS分析结果，研究各荷载方式作用下筒仓的整体受力性能；最后，分析总结试验结果、ANSYS仿真分析结果以及课题组前期的相关研究成果，针对筒仓模型在各种典型荷载单独作用下的简化设计进行研究。 通过以上研究，本文主要得出以下结论： (1)各对称卸料完成后仓内残留的储料形体按其特有方式对称；各偏心卸料完成后仓内残留的储料形体亦各有其非对称形式。 (2)筒仓卸料是以“承压拱”的形成到破坏为一个周期，循环往复，直至整个卸料完成；同时，卸料的过程包含整体流动和管状流动，整体流动和管状流动的交界处是容易出现动态特性的地方。 (3)对称卸料过程中任意时刻同一高度测点所受压强值相差不大；偏心卸料则有较大差异。不论对称还是偏心卸料，本文双壁筒仓模型内壁受压区侧压力分布沿高度均基本呈线性规律。 (4)双壁筒仓在卸料开始时刻未出现明显侧压力动态特性，，卸料过程中出现一定的动态特性。综合考虑整体趋势以及局部振荡，偏心卸料过程动态特性比对称卸料过程明显，点卸料、线卸料、面卸料动态特性依次增强。 (5)本文提出的偏心卸料荷载加载方式具有一定的可靠性，此加载方案在计算点偏心卸料、线偏心卸料、面偏心卸料的偏心卸料荷载时可靠性依次递增。 (6)偏心荷载作用下内、外板的最大应力较对称荷载作用均有一定的提升，增幅不超过25%。点、线、面偏心卸料方式在最不利时刻荷载作用下内、外板的应力依次增大。 (7)本文提出的双壁筒仓简化设计方法具有一定的可靠性，但与有限元仿真分析结果存在一定误差，结果偏于安全。 本文受国家自然科学基金（51008067）、江苏省六大人才高峰资助项目（2010-JZ-007）、住房和城乡建设部科学技术计划项目（2011-K1-68）的资助，在此表示诚挚的感谢。
[Abstract]:Silo, as the main tool of grain storage, plays an important role in the field of grain storage. Since the introduction of China in the middle of the 20 th century, it has been used more and more widely. However, the steel silo in our country is not mature enough in many aspects and needs further study. In this paper, the unloading test of a double-wall steel silo is first carried out according to the established discharge mode. Through the observation and analysis of the test phenomenon, the discharge characteristics and unloading principle of each discharge mode are obtained. Secondly, the test data are studied and analyzed. The lateral pressure distribution and dynamic characteristics of the silo's inner wall in the process of unloading are obtained. Thirdly, the eccentric unloading load loading mode and ANSYS simulation analysis are studied, and the numerical values are calculated by comparing the actual measurement and the theoretical calculation. To verify the accuracy of the loading scheme, through the analysis of the results of ANSYS analysis, the overall mechanical performance of silo under various loading modes is studied. Finally, the test results are summarized and the results of simulation analysis and related research results of the research group are summarized. The simplified design of silo model under various typical loads is studied. Through the above research, the main conclusions are as follows: (1) the residual material storage body in the warehouse after the completion of each symmetrical discharge is symmetrical according to its unique mode; After the completion of each eccentric discharge, there are also asymmetric forms of the residual materials stored in the silo. (2) the silo unloading takes the formation of a "pressurized arch" to the destruction as a cycle, circulates until the whole discharge is completed; at the same time, The process of discharging consists of integral flow and tubular flow, and the junction of integral flow and tubular flow is where the dynamic characteristics are easy to occur. (3) the pressure values at the same height at any time in the process of symmetrical discharge are not different from each other; Eccentric discharge is quite different. No matter symmetrical or eccentric discharge, the lateral pressure distribution along the inner wall of the double-walled silo model is basically linear along the height. (4) there is no obvious lateral pressure dynamic characteristic at the beginning of discharge. There are some dynamic characteristics in discharging process. Considering the overall trend and local oscillation, the dynamic characteristics of eccentric discharge process are more obvious than that of symmetrical unloading process. The dynamic characteristics of surface unloading are enhanced in turn. (5) the eccentric unloading load loading method proposed in this paper has certain reliability. The reliability of eccentricity unloading load increases in turn. (6) under eccentric load, the maximum stress of the outer plate is increased to a certain extent than that of symmetrical load, and the increase is not more than 25%. Under the most unfavorable load, the stress of the outer plate increases in turn. (7) the simplified design method of double wall silo presented in this paper has certain reliability. However, there is a certain error with the result of finite element simulation analysis, and the result is more safety. This paper is supported by the National Natural Science Foundation of China (51008067), the six Top talents funding Program (2010-JZ-007) of Jiangsu Province and the Science and Technology Project (2011-K1-68) of the Ministry of Housing and Urban-Rural Construction (2011-K1-68).
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU249.2;TU391
[Abstract]:Silo, as the main tool of grain storage, plays an important role in the field of grain storage. Since the introduction of China in the middle of the 20 th century, it has been used more and more widely. However, the steel silo in our country is not mature enough in many aspects and needs further study. In this paper, the unloading test of a double-wall steel silo is first carried out according to the established discharge mode. Through the observation and analysis of the test phenomenon, the discharge characteristics and unloading principle of each discharge mode are obtained. Secondly, the test data are studied and analyzed. The lateral pressure distribution and dynamic characteristics of the silo's inner wall in the process of unloading are obtained. Thirdly, the eccentric unloading load loading mode and ANSYS simulation analysis are studied, and the numerical values are calculated by comparing the actual measurement and the theoretical calculation. To verify the accuracy of the loading scheme, through the analysis of the results of ANSYS analysis, the overall mechanical performance of silo under various loading modes is studied. Finally, the test results are summarized and the results of simulation analysis and related research results of the research group are summarized. The simplified design of silo model under various typical loads is studied. Through the above research, the main conclusions are as follows: (1) the residual material storage body in the warehouse after the completion of each symmetrical discharge is symmetrical according to its unique mode; After the completion of each eccentric discharge, there are also asymmetric forms of the residual materials stored in the silo. (2) the silo unloading takes the formation of a "pressurized arch" to the destruction as a cycle, circulates until the whole discharge is completed; at the same time, The process of discharging consists of integral flow and tubular flow, and the junction of integral flow and tubular flow is where the dynamic characteristics are easy to occur. (3) the pressure values at the same height at any time in the process of symmetrical discharge are not different from each other; Eccentric discharge is quite different. No matter symmetrical or eccentric discharge, the lateral pressure distribution along the inner wall of the double-walled silo model is basically linear along the height. (4) there is no obvious lateral pressure dynamic characteristic at the beginning of discharge. There are some dynamic characteristics in discharging process. Considering the overall trend and local oscillation, the dynamic characteristics of eccentric discharge process are more obvious than that of symmetrical unloading process. The dynamic characteristics of surface unloading are enhanced in turn. (5) the eccentric unloading load loading method proposed in this paper has certain reliability. The reliability of eccentricity unloading load increases in turn. (6) under eccentric load, the maximum stress of the outer plate is increased to a certain extent than that of symmetrical load, and the increase is not more than 25%. Under the most unfavorable load, the stress of the outer plate increases in turn. (7) the simplified design method of double wall silo presented in this paper has certain reliability. However, there is a certain error with the result of finite element simulation analysis, and the result is more safety. This paper is supported by the National Natural Science Foundation of China (51008067), the six Top talents funding Program (2010-JZ-007) of Jiangsu Province and the Science and Technology Project (2011-K1-68) of the Ministry of Housing and Urban-Rural Construction (2011-K1-68).
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU249.2;TU391
【参考文献】
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