An arch tower axis optimization method for an arch tower cable-stayed bridge

Abstract

The invention relates to an arch tower axis optimization method for an arch tower cable-stayed bridge, which comprises the following steps: preliminarily formulating an arch tower axis line shape of the arch tower cable-stayed bridge and each section size of the arch tower according to requirements, and calculating the dead weight q of the arch tower; Dispersing the initial arch tower axis into aseries of nodes containing cable tower anchoring points and continuous short-size beam units, and establishing a finite element model to calculate and obtain an initial stay cable force Fi; Decomposing loads transmitted by stay cables on the two sides of the arch tower into vertical loads Vi and transverse bridge loads Hi in a plane where the axis of the arch tower is located; Calculating the length di of each section of the arch tower; Calculating node Z coordinates after arch tower axis optimization to obtain an arch tower axis after first optimization, calculating and determining a final optimized arch tower axis by adopting an iteration method, and obtaining a smooth arch tower axis equation by using high-order parabola fitting. The coordinates of each node of the arch tower axis of the arch tower cable-stayed bridge obtained by the method are very close to the pressure line corresponding to the optimized load of the arch tower axis, so that the bending moment of the arch tower canbe greatly reduced, the arch tower can give full play to the compressive property, and materials are saved.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to an optimization method for an arch tower axis of an arch tower cable-stayed bridge. Background technique [0002] With the continuous development of my country's transportation engineering construction, especially the intersection of urban and suburban railways, urban roads, expressways, shipping rivers, and hydropower pipe networks is becoming more and more common. The construction of piers and towers of over-line bridges brings difficulties. The arch tower structure has the advantages of strong bearing capacity, strong spanning capacity, and flexible arch foot arrangement. The arch tower structure cooperates with stay cables and has a good landscape effect. The tower cable-stayed bridge has been continuously developed. [0003] Conventional cable-stayed bridge pylons use column members, and under dead load, the pylons are mainly subjected to pressure and less bendin...

AI Technical Summary

Problems solved by technology

The calculation of the arch tower axis of the arch tower cable-stayed bridge should not only consider the effect of the vertical load on the arch (vertical distributed force or vertical concentrated force), but also consider the effect of the horizontal component force of the cable stay along the transverse bridge. Obviously The traditional "five-point coincidence method" is no longer suitable for the calculation of the axis of the arch tower. Therefore, the current design of the arch tower cable-stayed bridge is mostly based on the experience of bridge engineers, focusing on the requirements of the landscape to determine the axis shape of the arch tower. Under the action of load and live load, the bending moment of the arch tower is very large, the structural force is unreasonable and the structural characteristics of the main compression of the arch are not exerted, a large amount of material is wasted, and it is uneconomical. Therefore, it is necessary to find a new cable-stayed arch tower suitable for The theory and practical method of optimizing the axis of the arch tower of the bridge make the arch tower of the arch tower cable-stayed bridge mainly under compression. Under the condition of meeting the landscape requirements, the bending moment on the arch tower is as small as possible, so as to achieve the strength of the arch tower structure. Reasonable and economical purpose

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