宋 彧, 王永杰, 李爱鹏. 斜腹杆体外预应力索内力分析[J]. 工程力学, 2011, 28(5): 143-148.
引用本文: 宋 彧, 王永杰, 李爱鹏. 斜腹杆体外预应力索内力分析[J]. 工程力学, 2011, 28(5): 143-148.
SONG Yu, WANG Yong-jie. INTERNAL FORCE ANALYSIS OF EXTERNAL PRESTRESS CABLE OF TILTED BELLY POLES[J]. Engineering Mechanics, 2011, 28(5): 143-148.
Citation: SONG Yu, WANG Yong-jie. INTERNAL FORCE ANALYSIS OF EXTERNAL PRESTRESS CABLE OF TILTED BELLY POLES[J]. Engineering Mechanics, 2011, 28(5): 143-148.

斜腹杆体外预应力索内力分析

INTERNAL FORCE ANALYSIS OF EXTERNAL PRESTRESS CABLE OF TILTED BELLY POLES

  • 摘要: 基于传统体外预应力加固技术,提出了斜腹杆索结构体外预应力加固技术;以简支梁的加固为研究对象,对加固后组合结构体系的参量做了基本假定,建立了索结构理论模型并进行了推导,得到了组合结构中索变形增量的计算式和索张力的计算式;在索结构计算中改变了索长不变的假定,分析了索变形、索张力与荷载的关系。结果表明:索结构形状曲线为椭圆的一部分;索的最大水平张力位于跨中处,锚固点的水平力最小,该受力特点既能充分发挥索抗拉能力强的优势,又能减小索的水平分力对梁的不利影响;在沿索长的径向均布荷载作用下,索的长度增量与跨中挠度增量呈非线性关系,迭代计算时其精度与载荷步距大小有关,步距越小精度越高,反之则低。分析结果为新技术的应用提供理论参考。

     

    Abstract: Based on traditionally external prestressed reinforcement approaches, the paper proposes a new reinforcement technique, external prestressed cable of tilted belly poles. Taking the simply-supported beam as the object to be reinforced, the cable behavior is modeled. The formulas for the cable deformation and tension forces are obtained. The relations between cable deformation, tension forces and the applied load are investigated in this paper, showing that: (1) the cable configuration is of the form of ellipse; (2) the maximum horizontal tension force of the cable occurs at the mid-span of the simply-supported beam, and the minimum horizontal force occurs at the anchor point. Such a stress characteristic makes fully use of the cable advantage of high tensile capacity, as well as reduces the unfavorable effects of cable horizontal force on the beam. Under the action of the radial uniform load, the nonlinear relationship between the cable length incensement and the deflection incensement is observed. The iterative calculation algorithm prefers small load-step, the smaller the load-step, the higher the precision.

     

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