拱形张弦拱结构模型试验研究

Model Test Study of Arch String Structure with Upward-curved Cable

本文介绍了三组不同矢(垂)跨比拱形张弦拱结构模型的静力与动力特性试验研究情况。模型静力试验包括全跨均布荷载、半跨活荷载、预应力张拉过程模拟以及极限承载力试验;模型动力特性试验测试了结构的自振频率与振型,其中质量块按拱下吊挂配重与拱上附着配重两种方式。试验结果与理论公式及有限元分析进行了比对,证明了理论公式的正确性和可靠性。静力试验得出了拱形张弦拱结构的线性特性、支座水平位移与跨中竖向挠度大小相当、预应力对支座水平位移的控制作用,动力特性试验给出结构的基本振型为反对称双半波、质量块的设置方式对自振频率与振型有较大差异等结论。本文研究成果对该新型结构的工程应用有较好的参考意义。

In this paper,static test and dynamic test on three varied arch rise-span ratio（ cable sag-span ratio） of arch string structure with upward-curved cable（ ASSUC） are introduced. The static tests include uniformly distributed load test,half-span uniformly distributed live load test,prestressing effect test and ultimate bearing capacity load test. The frequencies and modes of suspension counterweight and counterweight on arch are tested by dynamic tests. According to the comparison of test results,theoretical results and nonlinear FEM results,it proves the correctness and reliability of theoretical results. Some conclusions of ASSUC tests are obtained,it includes several aspects： the results of the static tests indicate that the behavior of the ASSUC is almost linear under loading,the horizontal movement at the support end is close to the mid-span deflection,prestressing control the horizontal movement at the support end,the results of the dynamic tests show that the fundamental mode is anti-symmetric double half-wave,frequencies and modes are very difference on varied counterweight etc. The results of this paper are instructive for research and engineering fields of ASSUC.