Development of Automated Test Facility of Spatial Structures

1.空间结构具有三维空间形态，揭示了结构在外荷载作用下的复杂行为，目前关于结构屈曲、承载能力等方面的试验数据很少。基于此，本研究的目的是研制一套空间结构静、动载试验装置。该试验装置具有多轴驱动系统和位移传感器，它们在平面上布置在一个六边形框架内，并由计算机自动控制。2.在设计过程中，采用了两种空间结构：网壳结构和索杆组合结构，以确定试验设备的尺寸、作动器容量、位移大小等；3.从…的角度来看，由三维布置的杆件组成的网壳是一种优良的结构体系具有更大的强度和更大的强度，广泛应用于大跨度结构。在网壳结构设计中，为了减小杆件应力，增加屈曲荷载，抗弯刚度起着重要的作用。网壳的屈曲包括杆件屈曲、局部屈曲和整体屈曲。为此，国内外学者对球面网壳和圆柱壳进行了大量的理论分析。本文研究了端部为半球面的扁柱面网壳的一般屈曲问题。利用几何非线性荷载-竖向位移曲线估算屈曲荷载，并与圆柱体长度、矢跨比和半球面端部刚度等参数的变化进行比较。4.在新型试验装置的研制中，本文的研究工作尚处于起步阶段。为改善该设施，计划进行以下试验：(1)混合结构的静力试验；(2)扁壳的波传播试验；(3)浅网壳的屈曲试验。较少

1.Spatial structure have a three-dimensional from and reveals complicated structural behaviors under the external load so that there are few experimental data about the structural behabiours on buckling, load carrying capacity, etc. Based on this perspective, the objective of the research is to develop an automated static and dynamic loading test facility for spatial structures.The test facility has a multi-axs actuator system and displacement sensors which are arranged in a hexagonal frame in plan and controlled automatically by computer. To examine the validity of the test facility, buckling of shallow arch are tested.2.In the design process, two kinds of spatial structures : lattice shell and hybrid structure of cable and pole are adopted in order to determine the dimension, the capacity of actuator, the magnitude of displacement, etc.for the test facility.3.Lattice shell which is constituted by three-dimensionally arranging members is an excellent structural system viewed from ligh … More tness and strength, and is widely adopted for large span structures. When the lattice shell is designed, the bending stiffness plans an important role in order to reduce member stress and to increase buckling load. Buckling of lattice shell includes member buckling, local buckling and general buckling. From this reason, many papers on theoretical analysis have been presented for spherical lattice shells as well as for cylindrical shells. In this research, the general buckling of shallow cylindrical lattice shell with semi-spherical domical ends is considered. Buckling loads are estimated by using the geometrically nonlinear load-vertical displacement curves and compared with the change of parameters such as the length of cylindrical part, the rise-to-span ratio and the stiffness of semi-spherical ends.4.In the development of a new type test facility, the present research is in the first step. To improve the facility, the following tests are planned.(1) Static test of hybrid structures,(2) Wave propagation test of shallow shells, and(3) Buckling test of shallow lattice shalls. Less