Development of Automated Test Facility of Spatial Structures

1.由于空间结构具有三维空间形式，在外荷载作用下表现出复杂的结构行为，因此关于结构的屈曲、承载力等性能的试验数据很少。本课题的研究目的是研制一种自动化空间结构静动力加载试验装置，该装置具有多功能，轴的执行机构系统和位移传感器，在平面上布置在六边形框架内，由计算机自动控制。为了验证试验装置的有效性，对浅拱进行了屈曲试验。2.在设计过程中，对两种空间结构：采用网壳结构和索杆混合结构，确定了结构尺寸、作动器容量、位移大小，3.网壳结构是一种由三维空间排列的杆件组成的结构体系， ...更多信息 结构的刚度和强度，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，提高屈曲荷载，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。基于这个原因，许多关于球面网壳和圆柱壳的理论分析的论文已经被提出。本文研究了半球形封头扁柱面网壳的一般屈曲问题。利用几何非线性的荷载-竖向位移曲线估算了屈曲荷载，并与圆柱段长度、矢跨比、半球端刚度等参数的变化进行了比较。4.在新型试验装置的研制中，本研究处于起步阶段。为了改进设施，计划进行以下测试。(1)混合结构静力试验，（2）扁壳波传播试验，（3）扁网壳屈曲试验。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