腹杆数对预应力索受力性能影响试验研究

A Test Study on the Influence of Belly Pole Members on Stress Performance of Prestress Reinforced Cable Structures

用普通弹簧模拟预应力索,以斜腹杆数、载荷步距、垂跨比为试验参数,沿索的法向对索分级施加荷载,进行了7组试验。测试了索的长度、最大垂度值和最大张力等特征值,对索受力特点和变形规律的试验测试结果和理论计算结果进行了对比分析。结果表明,1)在其他条件不变的情况下,腹杆数越多,试验测试结果与理论分析结果越接近;2)试验值与理论值变化规律吻合,表明文献1的基本假定符合索的受力特点,建立的理论模型能够反映索的变形规律。试验研究为文献1的基本假定及以此建立的理论模型的正确性提供了依据,是理论模型能够在工程实际中应用的最基本的铺垫工作。

7 Unit Tests with ordinary spring were taken to simulate the preslressed cable. Vertical load was imposed on the cable, according to the variation of tilted belly pole members, load-steps and height span ratio. The deformation rule of the cable was studied by testing the characteristic values of cable, such as cable length, the maximum cable sag value, the maximum tension value. The results show that：l） On condition of the same other factors, the larger the number of web member is, the more close the test result is to the theoretical analysis test; 2） The change law of the test value tallies with the theoretical value, which shows the basic assumption of the I th document accords with the mechanical characteristics of cable and the established theory model can reflect the cable deformation regularity, the experimental study provides reference for the theoretical model basis of the basic assumption of the lth document, which is the basic work of theoretical model applied in engineering practice.