柱板式节点铝合金网壳静力稳定性分析

发布时间：2018-10-09 08:33

【摘要】：铝合金具有自重轻、耐腐蚀性好、无磁、易加工和美观等优点,由于其独有的特点,在与空间结构形式相结合的过程中逐渐发挥出优势,铝合金空间结构也以其优秀的表现力和适用性受到越来越多的关注与青睐,其应用也日益增多。在我国,铝合金单层球面网壳采用的节点形式单一,均为板式节点,其螺栓数量多,节点域腹板间断,抗剪性能较差。针对现有板式节点安装和受力性能的不足,本文研发了一种新型铝合金半刚性节点——柱板式节点,并展开了如下研究工作:(1)柱板式节点数值模型建立基于大型有限元分析软件ABAQUS建立了柱板式节点的精细化有限元模型,模型中考虑了螺栓预紧力,螺栓安装缝隙,节点各部件之间的接触,能够更加精确的模拟节点受力性能。(2)柱板式节点抗转动性能优化分析完成了柱板式节点前端板螺栓的位置和数量、螺栓安装缝隙、上下部螺栓类型(有无预紧力)、前端板厚度的优化分析,以及前端板焊接热影响区对节点受力性能的影响分析。结果表明,前端板螺栓的位置和数量、螺栓安装缝隙、上下部螺栓类型对节点受力性能均有较大影响。(3)多种荷载作用下,柱板式节点和板式节点受力性能分析及对比完成了柱板式节点和板式节点在纯弯、剪弯、轴心压力、轴心拉力、偏心压力、偏心拉力、压弯、拉弯等作用下的抗转动性能研究与对比。结果表明,柱板式节点在纯弯、轴心压力、偏心压力、压弯、弯剪作用下受力性能明显优于板式节点,对于其他荷载工况,其受力性能也有所改善。(4)柱板式节点单层椭圆抛物面网壳静力稳定性分析建立了柱板式节点单层铝合金椭圆抛物面网壳的数值模型,考虑节点强轴刚度、弱轴刚度、扭转刚度、几何初始缺陷、跨度、矢跨比、荷载分布形式、支承形式等因素对网壳受力性能的影响,展开参数分析。获得了网壳的极限承载力,掌握了柱板式点椭圆抛物面网壳的静力稳定性能,并与板式节点椭圆抛物面网壳进行对比分析。
[Abstract]:Aluminum alloy has the advantages of light weight, good corrosion resistance, no magnetism, easy processing and beautiful appearance. Because of its unique characteristics, aluminum alloy gradually exerts its advantages in the process of combining with the space structure form. Aluminum alloy space structure has attracted more and more attention because of its excellent performance and applicability, and its application is increasing day by day. In China, aluminum alloy single-layer spherical reticulated shell has a single joint form, all of which are plate joints, with a large number of bolts, discontinuous web in the joint domain, and poor shear performance. A new type of aluminum alloy semi-rigid joint, column plate joint, is developed in this paper to overcome the deficiency of the installation and mechanical performance of the existing plate joints, and a new type of aluminum alloy semi-rigid joints is developed in this paper. The following research works are carried out: (1) the numerical model of column plate joint is established. The fine finite element model of column plate joint is established based on the large-scale finite element analysis software ABAQUS. The pre-tightening force of bolt and bolt installation slot are considered in the model. The contact between the components of the joint can more accurately simulate the mechanical performance of the joint. (2) the optimization analysis of the anti-rotation performance of the column-plate joint completes the position and quantity of the bolt in the front plate of the column-plate joint, and the installation gap of the bolt. The type of upper and lower bolts (with or without pretightening force), the optimization analysis of the thickness of front end plate, and the influence of welding heat affected zone of front end plate on the mechanical performance of joints are analyzed. The results show that the position and quantity of bolt in front plate, the installation slot of bolt, the type of bolt in top and bottom have great influence on the mechanical performance of joint. (3) under various loads, The performance analysis and comparison of column plate joint and plate joint are completed in pure bending, shear bending, axial pressure, axial tension, eccentric pressure, eccentric tension, compression and bending. The study and comparison of the anti-rotation performance under the action of tension and bending. The results show that the behavior of column plate joints under pure bending, axial pressure, eccentric pressure, bending and bending shear is obviously superior to that of plate joints. (4) static stability analysis of single layer elliptic paraboloid reticulated shell with column plate joints. The numerical model of single layer aluminum alloy elliptic parabolic reticulated shell with column plate joint is established, which takes into account the strong axial stiffness, weak axial stiffness and torsional stiffness of the joints. The effects of geometric initial defects, span, rise-span ratio, load distribution form and supporting form on the mechanical properties of latticed shells are analyzed. The ultimate bearing capacity of the reticulated shell is obtained and the static stability of the cylindrical plate point elliptical parabolic reticulated shell is grasped and compared with the plate node elliptical parabolic reticulated shell.
【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】：2015
【分类号】：TU395;TU311.1

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