Prestress design method for cable-stayed bridge concrete cable bent tower anchorage zone

Abstract

The invention relates to a prestress design method for a cable-stayed bridge concrete cable bent tower anchorage zone, and belongs to the field of the prestress design of the cable bent tower anchorage zone. The method comprises the following steps that: S1: determining the front wall thickness-width ratio [Lambda] of the cable bent tower; S2: according to the [Lambda] value, selecting a cable bent tower-compression bar model to be adopted, and calculating a geometrical parameter; S3: solving maximum pull bar internal force; S4: according to the maximum pull bar internal force, calculating theamount of required prestress ribs; and S5: according to a pull bar movement direction in the model, arranging the prestress ribs. The method can be used for the quantitative design of the prestress of the cable bent tower anchorage zone, and puts forward a cable bent tower anchorage zone pull-compression bar model which has a specific geometrical parameter and can be directly used by engineeringpersonnel. The method has the advantages of high universality, high design efficiency, clear mechanical concept and high calculation accuracy, and blindness and low efficiency caused by a situation that traditional cable bent tower anchorage zone design depends on the experience of design personnel and a great quantity of trial calculations are avoided.

Description

technical field [0001] The invention relates to a prestress design method of a concrete cable tower anchorage area of ​​a cable-stayed bridge, and belongs to the field of prestress design of a cable tower anchorage area. Background technique [0002] The cable-stayed anchorage area of ​​the cable-stayed bridge is a key part of the cable-stayed bridge structure. Its structure is complex, the local force is concentrated, and the design and construction are difficult. It has always been one of the key concerns of bridge engineers. The concrete cable tower with box section in the form of sidewall anchorage, the huge cable force of the stay cable acts on the tower column, the vertical component force is transmitted to the tower body through the anchor block, and the huge horizontal component force acts on the relatively weak On the side wall of the tower column, the concrete of the tower wall and the structural steel bars arranged in it cannot bear it. Therefore, the horizontal p...

AI Technical Summary

Problems solved by technology

This method has sufficient accuracy and is easy to apply in engineering. It is a low-cost and high-efficiency method to guide the design and optimization of the anchorage area of ​​the cable tower.

However, most of the published studies so far only focus on a specific case, which is not universally applicable, and this method requires the designer to have the basis of topology optimization, which limits its wide application. Compression bar model and prestressed structure analysis, Zhu Jingwei et al., Bridge Construction, 2017, vol.(05), pp.59-64" disclosed method

Document 2 "Research on key issues of prestressed concrete towers of long-span cable-stayed bridges, Tao Qiyu, Southwest Jiaotong University, 2012" proposed a prestressed quantitative design calculation formula based on the tension-compression bar model, but it is relatively rough, and the relationship between parameters is not good. It is clear that the calculation accuracy is low, and the tension-compression model that is convenient for engineering application is not given, and the position design of the prestressed tendons cannot be realized, which makes the designer fall into a "black box" operation, and loses the tension-compression model to reveal the internal transmission of the structure. The superiority of the force mechanism

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