Nonlinear Analysis of Beams Prestressed by Unbonded Cables
Nonlinear Analysis of Beams Prestressed by Unbonded Cables
复制标题
无粘索预应力梁的非线性分析
DOI：
10.1061/(asce)0733-9399(1993)119:4(720
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
L. Dezi
中科院分区：
文献类型：
--
作者：
A. Dall'asta;L. Dezi
通过考虑非线性材料和一般的索路径，以比以前的公式更一般和统一的方式分析了通过拉伸索沿沿着与梁刚性连接的路径滑动而施加预应力的梁的问题。此外，作者打算表明，弱形式的问题，总势能最小化的基础上，远比强形式，基于局部平衡，从形式和数值的观点。弱形式表达了整体平衡条件，并以更自然的方式描述了该系统的物理行为，其中滑动索将局部平衡与整体变形结合起来。利用里兹近似法给出了求解非线性问题的数值方法，并给出了混凝土梁的计算结果。
The problem of a beam prestressed by means of a stretched cable slipping along a path rigidly linked to the beam is analyzed in a more general and unitary way than in previous formulations by considering nonlinear materials and generic cable paths. Moreover, the writers intend to show that the weak form of the problem, based on total potential energy minimization, is far more convenient than the strong form, based on local equilibrium, from both formal and numerical points of view. The weak form expresses global equilibrium conditions, and describes in a more natural way the physical behavior of this system in which the slipping cable joins the local equilibrium to the global deformation. A numerical method for the solution of the nonlinear problem is provided by using the Ritz approximation method, and results concerning a concrete beam are reported.