A preload springback method for determining the initial prestress distribution of tensioned cable-strut structures

Abstract

The invention discloses a preload rebound method for determining the initial prestress distribution of a tensioned cable bar structure. First, a preset load is applied to the structure to obtain the initial internal force mode of the structure resisting the preset load, and then the preset load is removed. Load, the internal force mode is applied to the structure as a prestress, so that the structure rebounds under the initial internal force, and the overall feasible prestress mode of the tensioned cable-strut structure can be obtained through iterative calculation. The invention is especially suitable for multi-self-stress modal structures. By applying symmetrical loads, the grouping of units can be automatically realized, which facilitates the judgment of the overall feasible prestress, and can directly obtain the optimal prestress modal of the multi-self-stress modal structure. The preload springback method of the present invention has high precision and fast convergence speed, and the obtained overall feasible prestress mode is directly applicable to practical engineering applications, and can obtain an optimized tension cable rod structure shape.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a preload springback method for determining the initial prestress distribution of a tensioned cable-strut structure. Background technique [0002] Tensioned cable-strut structures consist of cables and rods, which have no stiffness and no bearing capacity until prestress is applied. The first problem to be solved is to determine the initial prestress to form a certain stiffness according to the initial geometric shape of the structure and the relationship between components. [0003] The methods for determining the initial prestress distribution of tensioned cable-strut structures mainly include nodal force balance method, quadratic singular value method, nonlinear finite element method, force density method and dynamic relaxation method. Among them, the nodal force balance method is suitable for the single self-stress mode, and the symmetrical simple and regula...

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Problems solved by technology

Among them, the nodal force balance method is suitable for the single self-stress mode, and the symmetrical simple and regular tensioned cable-strut structure; the second singular value decomposition method fully considers the symmetry of the tensioned cable-strut structure and the tension of the cable and the stress of the compression rod. According to the characteristics of pressure, the concept of overall feasible prestress is proposed, and the corresponding judgment criterion is established, which has wide applicability. Optimizing the combination, and there are many optimization methods, and various optimization goals are set, which has caused certain difficulties in practical application.

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