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为进一步探索空腹索桁张力结构初始预应力分布、静力性能及误差敏感性,在理论分析的基础上,设计加工了一直径5m的结构模型.提出了该模型支承平台、可调索杆、连接节点等加工制作方案及基于最小二乘法的各测点内力-应变关系拟合方法,考察了张拉各构件到设计长度时的体系初始预应力分布,模型在满跨、半跨和1/4跨等多种荷载工况下的静力响应及通过调整杆件长度模拟杆长误差以考察长度的误差敏感性.研究表明,当所有构件都张拉到设计长度时,空腹索桁张力结构初始预应力分布将达到设计值;结构在不对称荷载作用下易发生平面外失稳,平面外刚度较差,而在整体均布荷载作用下表现出良好的承载性能;环索长度误差敏感性最明显,脊索、斜索次之,桅杆最弱.初内力分布、多种荷载工况下的静力响应及误差敏感性分析理论值与实测值基本吻合,表明了理论分析的正确性和模型设计的有效性.
In order to further explore the initial prestress distribution, the static performance and the error sensitivity of the tensioned truss girder tension structure, a structural model with a diameter of 5m was designed and machined on the basis of theoretical analysis. The model supporting platform, Connecting nodes and other processing and manufacturing programs and based on the least square method of measuring points of internal force - strain relationship fitting method, the tension of each component to the design length of the system when the initial prestress distribution model in full span, half span and 1 / 4 span load conditions such as static response and by adjusting the length of the rod analog rod length error to investigate the length of the error sensitivity study shows that when all the components are stretched to the design length when the tension cable truss tension structure The initial prestress distribution will reach the design value. The structure is prone to out-of-plane instability and out-of-plane stiffness under the asymmetric load, and shows good bearing capacity under the uniform uniform load. The error of ring length error The most obvious, chord, oblique cable followed by the mast is the weakest.The initial internal force distribution, static load response under various load conditions and error sensitivity analysis The theoretical value and the measured value basically agree, On the Correctness of Analysis and the Effectiveness of Model Design.