树状结构找形优化分析及结构性能研究

发布时间：2018-10-11 07:51

【摘要】：树状结构力流明确，传力合理，造型优美，是一种集造型仿生和结构仿生为一体的仿生结构，可应用于大型游乐场所、文化场馆、机场建筑和候车站台等结构工程中。随着树状结构的不断应用和研究的逐渐深入，在分析理论方面还有一些课题需要完善，如简便高效的树状结构找形方法和太阳辐射下非均匀温度场对树状结构的影响等。本文采用数值模拟、试验研究和现场实测相结合的方法，对上述问题进行了深入的研究，取得了一些研究成果，以期对树状结构的理论研究和工程应用提供一定参考。作为仿生结构的一种，树状结构的定义和组成编码等基本概念并没有明确规定。本文将树状结构定义为在研究自然界中树木的形态及受力特性的基础上，，所设计的具备一定支承作用的结构。为便于对比分析并完善树状结构的基本概念，提出树状结构的结构组成，规定树状结构的编码。在总结实际工程应用的基础上，按照不同的分类方式对树状结构进行分类。可为树状结构系统研究奠定基础。树状结构的形态关系结构的力学性能，如何使结构受力更为合理，是值得关注和研究的。在综合比较树状结构物理找形、数值模拟找形方法，研究连续折线索单元的基础上，提出一种基于连续折线索单元的高效树状结构找形方法，该方法模拟索单元的只拉特性且操作简便。将该方法应用于二维树状结构的找形分析，能够有效减小节点荷载和均布荷载下树状结构的杆件单元弯矩，效果较理想。以二级分杈和三级分杈树状结构为例，给出静力找形方法和动力找形方法的一般步骤。通过模拟试验，并与数值找形方法对比，验证了基于连续折线索单元找形方法的可行性。对节点荷载下的二级分杈树状结构提出优化方法，并对树状结构的找形结果进行初步探讨。提出基于连续折线索单元的三维树状结构找形方法，找形后的单元弯矩值减小。将该找形方法应用于天山海世界米立方项目中树状结构的找形分析，对找形确定的树状结构与实际采用的树状结构进行力学性能的对比分析。对树状结构树枝分级不同的整体结构进行结构性能研究，二级分杈树状结构支承的结构力学性能优于一级分杈树状结构体系，明显优于普通柱结构。树状结构与上部屋盖刚接连接和铰接连接对结构整体性能影响不大。树状结构的节点形式对单树和屋盖组合的结构形式影响较大，考虑米立方工程周圈环梁落地，树状结构节点形式对结构整体性能影响不大。室内大空间环境供暖或制冷，外部太阳辐射和内外大温差的共同作用下，树状结构支承的整体结构处于动态的非均匀温度场作用下。对米立方工程在夏季的结构温度现场实测和数据采集，验证理论分析得到的非均匀温度场数值模拟结果。研究不同温度工况对树状支承结构的性能影响，得到温度作用对结构影响较大，且太阳辐射下非均匀温度场对结构整体影响较大的结论，考虑米立方室内戏水部分的恒温因素，非均匀温度场下的树状结构内力分析更加符合实际情况。树状结构作为支承的整体结构相较于普通柱支承的结构，能够有效减小温度作用下结构的单元应力和节点位移。基于三维树状结构的性能研究，提出有效抗侧力、提高结构协同受力能力的森林结构体系，并对该体系进行结构性能研究。
[Abstract]:The tree structure force flow is clear, the transmission force is reasonable, the modeling is beautiful, and is a bionic structure integrating modeling bionic and structural bionic as a whole, and can be applied to structural engineering such as large amusement parks, cultural venues, airport buildings and waiting stations. With the gradual application of tree structure and the gradual deepening of research, some subjects need to be improved in the aspects of analysis theory, such as simple and efficient tree structure finding method and the influence of non-uniform temperature field on tree structure under the solar radiation. In this paper, numerical simulation, experimental research and field measurement are used to study the above problems, and some research results have been obtained with a view to providing some reference for the theoretical research and engineering application of the tree structure. As a kind of bionic structure, the basic concepts such as the definition and composition coding of the tree structure are not clear In this paper, the tree structure is defined as the foundation of studying the shape and bearing characteristics of trees in nature. Structure. For the purpose of comparing and analyzing and improving the basic concept of tree structure, the structure composition of tree structure is put forward, and the tree structure is specified. coding. On the basis of summarizing the practical engineering application, the tree structure is carried out according to different classification modes Classify. Can lay a foundation for the research of tree structure system On the basis of the mechanical properties of the shape relation structure of the tree structure, how to make the structure stress more reasonable, it is worth closing In this paper, a kind of efficient tree structure finding method based on continuous fold line unit is proposed in this paper, which simulates the pull-out characteristic of cable unit. The method is simple and convenient to operate. The method is applied to the finding analysis of the two-dimensional tree structure, and can effectively reduce the bending moment of the rod unit of the tree structure under the load of the node and the load of the uniform cloth, The method of static finding and the method of power finding are given in this paper. Through the simulation test, and compared with the numerical finding method, the shape-finding method based on the continuous fold line unit is verified. The feasibility of the method is as follows: the optimization method is put forward for the tree structure of the secondary sub-tree under the load of the node, and the finding results of the tree structure are obtained. In this paper, a three-dimensional tree structure finding method based on continuous fold line unit is put forward. The finding method is applied to the shape analysis of the tree structure in the world rice cube project of the Tianshan Sea, and the tree structure determined by the finding shape is subjected to the force of the tree structure actually adopted. The structural and mechanical properties of tree-like structure supported by tree structure are better than that of the first-stage branch-tree structure system, and the structural mechanical properties of the two-stage branch-tree structure support are better than that of the first-stage branch-tree structure. the tree structure is connected with the upper house cover just after being connected and the hinged connection pair structure The node form of tree structure has great influence on the structure form of single tree and house cover combination, which takes into account the structure of the ground and tree structure nodes of the round ring beam of Micube project. The overall performance impact is not large. Under the common action of indoor large space environment heating or cooling, external solar radiation and large temperature difference inside and outside, the overall structure of the tree structure support is in motion. Under the action of non-uniform temperature field of the state, the measurement and data acquisition of the structural temperature of Micube project in summer and the non-uniform temperature field are obtained. The results of numerical simulation of uniform temperature field are studied. The effect of different temperature conditions on the structure of the tree support structure is studied. The effect of temperature on the structure is great, and the non-uniform temperature field under the solar radiation has a great influence on the whole structure. Constant temperature and non-uniform temperature field of indoor play water part According to the structure of the support, the tree structure can effectively reduce the junction under the action of temperature. Based on the performance research of three-dimensional tree structure, this paper proposes a forest structure system with effective anti-lateral force and increasing the capacity of structural collaborative stress.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU31

【参考文献】