Loading and pre-internal-force calculation method of secondary self-internal-force structure

Abstract

The invention discloses a loading and pre-internal-force calculation method for a secondary self-internal-force structure. The method comprises the steps of calculating all loads of the secondary self-internal-force structure; adjusting at least one node of the secondary self-internal-force structure to be in a first connection state, and applying a first load and a preload to the secondary self-internal-force structure; based on the applied first load and the preload, respectively calculating the internal force at each node of the secondary self-internal-force structure; adjusting at least one node of the secondary self-internal-force structure to be in a second connection state again, removing the preload on the secondary self-internal-force structure, and applying a second load on the secondary self-internal-force structure; respectively calculating internal force at each node of the secondary self-internal-force structure based on the unloaded preload and the applied second load; and superposing the internal forces to obtain a target internal force. By adopting the load applying method, the structural design of the secondary self-internal-force structure can be optimized, the stress cross section of the secondary self-internal-force structure does not need to be increased, and the control difficulty of structural design economic indexes of the secondary self-internal-forcestructure is reduced.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to a method for calculating loading and pre-internal force of a secondary self-internal force structure. Background technique [0002] The secondary self-internal force structure mainly refers to the internal force perpendicular to the load direction generated by the load (that is, the secondary self-internal force), that is, the structure that has nothing to do with the load, such as reticulated shell structures and arch structures. Taking reticulated shells as an example, in engineering design, it is usually necessary to carry out force analysis on the designed reticulated shells to judge the feasibility and rationality of the structural design of reticulated shells. [0003] At present, the force of the reticulated shell is usually calculated under the condition that the connection stiffness of the nodes of the reticulated shell is directly generated to the design ...

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Problems solved by technology

However, it has been found through practice that using the above method, since the connection stiffness of the nodes has a great influence on the internal force, when the connection stiffness of the nodes is directly generated to the design stiffness state and bears all the loads, the reticulated shell will generate a large The secondary self-internal force, and its force distribution is extremely uneven. For example, the force at the nodes at both ends may be very concentrated, while the force at the middle is very small, or the force at one end of the nodes at both ends is concentrated, and the other end is affected by The force is very small, and the force in the middle is also very small

The above-mentioned large secondary self-internal force and the uneven distribution of these two kinds of forces will easily lead to uneconomical or unfeasible design of the structure of the reticulated shell, for example, due to the large secondary self-internal force and concentrated force, it is necessary to increase the The cross-section of the component will make the reticulated shell occupy the engineering space when it is applied to the project, resulting in limited engineering design

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