A Comprehensive Algorithm for Determining Reasonable Construction Cable Forces of Cable-Stayed Bridges

Abstract

The invention discloses an integrated algorithm for determining the reasonable construction cable force of a cable-stayed bridge. The algorithm includes the following steps that first, the minimum limiting value of a stay cable in initial tensioning is calculated, a completed bridge state is obtained through an initially drafted cable force in a forward-calculation method, a cable force influence matrix is extracted, a tensioning force value is adjusted through the influence matrix, a completed bridge state cable force value is matched with designed completed bridge cable force, and whether structure stress performance meets standard requirements or not is checked under the completed bridge state and in the construction process. The limit of a single method for determining the reasonable construction cable force is overcome, advantages of a forward-calculation iteration method and advantages of an influence matrix method are integrated, influences on the structure by girder concrete shrinkage and creep and nonlinearity in the construction process are considered, meanwhile, by the utilization of the influence matrix method, the frequency of forward iteration is greatly reduced, a lot of time is saved, and the integrated algorithm is closer to a reasonable completed bridge cable force value; meanwhile, at the construction stage, when changes occur, completed bridge cable force can be rapidly adjusted to be a designed completed bridge cable force value.

Description

technical field [0001] The invention relates to a method for determining the reasonable construction cable force of a cable-stayed bridge. Background technique [0002] Cable-stayed bridge, also known as cable-stayed bridge, is a bridge in which the girder body is directly pulled on the bridge tower by many cable-stayed cables. a structural system. The cable-stayed bridge can be regarded as a multi-span elastically supported continuous beam with cable-stayed cables instead of buttresses, which can reduce the bending moment in the beam body, reduce the height of the building, reduce the weight of the structure, and save materials. Due to the adjustability of the stay cables, the design calculation algorithm of the stay cables is different from that of the general bridge type. The cable-stayed bridge can change the internal force distribution of the structure by adjusting the cable force of the stay cables, so the stress of the stay cable force on the structure and deformati...

AI Technical Summary

Problems solved by technology

Among them, the calculation of the upside-down method is complicated. Due to the influence of factors such as concrete shrinkage, creep and geometric nonlinearity, there is a phenomenon that the state and calculation are not closed, and the result of the structure after the formal installation is deviated from the design value.

Although the front-loading-upside-down iteration method and the front-loading iteration method can eliminate the non-closure phenomenon caused by concrete shrinkage, creep and nonlinearity, the number of iterations is large, and multiple sets of data need to be processed, which consumes a lot of time

The stress-free state control method was proposed at the latest, and its use is not yet mature.

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