论文部分内容阅读
针对索杆预张力结构施工中存在的杆件长度误差,基于随机理论建立符合正态分布的随机误差模型,推导了结构预张力偏差与索长偏差的基本关系,并根据数理统计方法得到随机预张力偏差的统计特性,得到各杆件长度误差敏感性评价方法。通过设计跨度为5 m的空腹索桁架结构模型,并在其上调整索杆长度来模拟施工过程中产生的长度误差。分析了引入误差后体系预张力变化及结合ANSYS软件数值分析来考察验证各杆件的误差敏感性。结果表明:预张力结构不同杆件具有不同长度误差敏感性。空腹索桁架结构中环索误差敏感性最明显,脊索、斜索次之,桅杆最弱;试验结果与理论分析基本一致,表明理论分析和模型设计加工的有效性和正确性。
Aiming at the rod length error existing in the construction of prestressed cable rod structure, a stochastic error model fitting normal distribution was established based on stochastic theory, and the basic relationship between structural pretension deviation and rope length deviation was deduced. According to mathematical statistics, Tension deviation of the statistical properties, the length of the error sensitivity of the method of evaluation. The length error of the construction process was simulated by designing the model of the cable truss with a span of 5 m and adjusting the length of the cable rod. The change of pre-tension of the system after the introduction of the error and the numerical analysis of the ANSYS software were analyzed to verify the error sensitivity of each rod. The results show that different pre-tensioned bars have different length error sensitivity. The sensitivity of the cable between the cable truss and the cable truss is the most obvious, followed by the notochord and the inclined cable, and the mast is the weakest. The experimental results are basically consistent with the theoretical analysis, which shows the validity and correctness of theoretical analysis and model design and processing.