国家大剧院壳体钢结构安装的变形控制

控制变形,是国家大剧院大跨度壳体钢结构安装的关键。主要从支架施工、顶环梁定位、测量、临时支撑等方面进行了变形控制。     

Buckling and dynamic instability analysis of stiffened shell panels

The static and dynamic instability characteristics of stiffened shell panels subjected to uniform in-plane harmonic edge loading are investigated in this paper. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. As the usual formulation of degenerated beam element is found to overestimate the torsional rigidity, an attempt has been made to reformulate it in an efficient manner. Moreover, the new formulation for the beam element requires five degrees of freedom per node as that of shell element. The method of Hill's infinite determinant is applied to analyze the dynamic instability regions. Numerical results are presented through convergence and comparison with the published results from the literature. The effect of various parameters like shell geometry, stiffening scheme, static and dynamic load factors, stiffener size and position, and boundary conditions are considered in buckling and dynamic instability analysis of stiffened panels subjected to uniform in-plane harmonic loads along the boundaries.     

马鞍板的工程应用

介绍了马鞍板的工作原理及其结构的优、缺点,并与传统屋面进行了分析比较,阐述了马鞍板在使用过程中存在的问题,并分析了其原因,探讨了马鞍板的可用性及其发展意义,以使该新型屋面结构得到更好的发展。     

Lightweight concrete made from oil palm shell (OPS): Structural bond and durability properties

The first part of this experimental program was to determine the structural bond properties of lightweight concrete incorporating solid waste oil palm shell (OPS) as coarse aggregate and also to compare its behaviour with other types of lightweight aggregate concretes. Other properties of OPS concrete namely the split tensile strength, modulus of rupture and modulus of elasticity were also determined. The structural bond properties were determined through pull-out test. The results showed that the experimental bond strength of OPS concrete was much higher than the design bond strength as stipulated by BS 8110. In general, the properties of OPS concrete compared well with that of other structural lightweight concretes and the results obtained encourage the use of OPS as aggregates for the production of structural lightweight concrete. The second part of the experimental program investigates the durability performance of OPS concrete through water permeability and water absorption tests.     

江西宜春体育馆联体异形网壳的设计与施工

江西宜春体育馆根据建筑要求，设计成一个由四个曲面组合而成、具有太空动感的“飞碟”造型联体异形网壳。文中介绍了该网壳多方案比较后的结构造型和网壳的设计分析，论证了该复杂体型网壳方案的合理性。     

混凝土搅拌工艺改革的理论与实践

传统搅拌工艺理论的缺陷是片面强调“匀质性” ,忽视了细观层次的结构特性 ,以致产生薄弱的“过渡环” ,影响了混凝土的特性。造壳搅拌理论则要求在保证宏观均匀的同时 ,强调在细观层次上加强骨料与基材的界面粘结 ,由此提高混凝土的整体性能。符合我国国情的裹砂石法搅拌工艺 ,已取得了明显的技术经济效益。     

空间结构在建筑中的应用

本文综合评述了国内外空间结构的发展状况,论述了空间结构的基本概念和分类(包括薄壳、网架、网壳、悬索及膜结构)及优点,并介绍了一些重要的工程实例。最后讨论了空间结构在建筑中应用的发展前景。     

小型非致命火箭防暴弹发动机设计与试验

为实现远距离发射非致命防暴弹,采用理论计算与实验相结合的方法,确定了小型火箭发动机的结构尺寸,对发动机推进剂和延时剂进行了试验,测试了发动机的性能参数。试验表明,小型发动机满足非致命火箭防暴弹战术指标要求。     

水下发动机复合壳体一体化设计技术

介绍了水下发动机复合壳体一体化设计新技术,对其耐外压性能进行了仿真计算,并对发动机尾罩耐压性能和防渗性能进行了试验验证。结果表明,水下发动机可以采用以玻璃钢为主体材料的一体化复合壳体,在有效减小发动机质量和体积的同时实现水下密封,可广泛应用于水下高速航行器设计。