Hopper-shaped screen installation design method applied to large-span rigid roof cable dome structure

Abstract

The invention discloses a hopper-shaped screen installation design method applied to a large-span rigid roof cable dome structure. The method comprises the following steps of S1, preliminarily determining all hanging point position schemes suitable for hanging a hopper-shaped screen by utilizing bearing points reserved in the cable dome structure design, enabling the dead weight of the hopper-shaped screen to be equivalent to node loads, averagely allocating the node loads to all hanging points of each hanging point position scheme, and performing finite element analysis on a cable dome structure model applying different hanging point position schemes; S2, selecting a proper hopper-shaped screen hanging point position scheme according to key node displacement and key component internal force information of each hanging point position scheme; S3, presetting a prestressed cable system before the hopper-shaped screen is installed, and enabling the tension of a tensioned prestressed cableto be equivalent to the dead weight of the hopper-shaped screen; and S4, controlling the dead weight loading amount of the hopper-shaped screen in unit time to be consistent with the tension reductionamount of the prestressed cable in the unit time until the hopper-shaped screen is completely hoisted. According to the method, a reference basis is provided for the design of a related flexible tension cable structure system containing the hopper-shaped screen.

Description

technical field [0001] The invention relates to a method for installing and designing large-scale bucket screens in construction fields such as stadiums, and in particular to a method for installing and designing bucket screens applied in large-span rigid roof cable dome structures. Background technique [0002] As an important medium for information release in modern society, LED display has developed rapidly in recent years. At present, in large stadiums at home and abroad, LED screens have become the mainstream as a new type of display device. The placement of LED screens in large stadiums is generally located at the position of the oblique stands or the central position of the venue. The central position of the venue is divided into ground placement and aerial suspension. Because the suspended central LED screen is similar to a funnel in shape, it is called "Double Screen". . The LED display system can complete multiple tasks such as capture of wonderful moments, playb...

AI Technical Summary

Problems solved by technology

Because the cable dome structure system is limited by its structural characteristics, it has high requirements for the load acting on it, and is more sensitive to the internal force of the cable components, while the bucket screen structure is heavy, and the bucket screen itself can weigh dozens of tons. During the installation process, the internal force of the cable member will change. At the same time, different hanging point positions are used to hang the bucket screen on the cable dome structure, which has a great influence on the distribution of the internal force of the cable member. The reduction of the geometric stress stiffness established by the internal prestress will seriously threaten the safety of the entire cable dome structure, so measures need to be taken to ensure that the internal force of the cable components remains unchanged during the actual installation process

[0003] The hanging point of the common bucket screen suspension is set on the rigid steel roof member. There is insufficient research on the design of the hanging point position applied to the bucket screen suspension of the flexible tension cable dome structure. At the same time, the cable force change during the bucket screen installation process is usually solved. The solution to the problem is that during the roof installation process, additional counterweights such as buckets or sandbags will be used to equal the weight of the bucket screen. The internal force remains unchanged, but this traditional measure of canceling the additional counterweight is often time-consuming and labor-intensive, the construction efficiency is low, and the safety and accuracy of the entire bucket screen installation process cannot be well guaranteed. It is very necessary to install and design the bucket screen which is less affected by the force of the components

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