Suspended-dome multi-time prestressed construction method

Abstract

The invention discloses a suspend dome structure multi-prestressed construction method used in construction field. The construction method is that: firstly, a central pressure ring, an upper radial bar and edge elements are arranged on an upper layer; secondly, a lower radial rope, a lower ring rope and a strut are arranged on a lower layer; thirdly, prestress is applied in the structure by stretching the lower ring rope or stretching the lower radial rope or adjusting the length of the strut; fourthly, a ring bar is arranged; fifthly, an external load is applied on the structure. Compared with the structure formed by a traditional method, the suspend dome structure formed by the invention reduces peak pressure of elements with concise force, even changes a part of elements from a pressure bar to a tension bar, avoids instability of elements, at the same time enhances the entire stability of the whole structure and enlarges the ultimate bearing capacity. Furthermore, the invention leads a more even distribution of internal force of the upper layer network shell bar elements, is helpful to the unity of the elements and convenient for design and construction, at the same time, the invention reduces the applied prestress value and reduces construction difficulty.

Description

Technical field [0001] The invention relates to a construction method of a string-supported dome structure applied in the construction field, in particular to a multiple-prestress construction method of the string-supported dome. Background technique [0002] In recent years, with the development of prestressed steel structures, a large number of new structural systems have emerged, such as string-supported dome structures. The string dome is a new structure formed by combining the cable dome and the single-layer reticulated shell. That is, the upper flexible cable of the cable dome is replaced by a single-layer reticulated shell, which increases the roof rigidity and reduces the construction difficulty. The current traditional construction method is to install the upper reticulated shell first, and after the upper reticulated shell is fully installed, the hoop cables are stretched in a certain order. However, the string-supported dome formed by the traditional method has the fol...

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Problems solved by technology

[0004] (2) The internal force of the single-layer reticulated shell on the upper layer of the suspensive dome is passively generated by the lower layer of steel cables and external loads, and cannot self-adjust the internal force, so that most of the hoop members of the upper single-layer reticulated shell are passively compressed and cannot be self-adjusted to reduce Pressure; most of the radial rods of the upper single-layer reticulated shell are passively compressed, and the pressure varies in size and unevenly distributed, which causes inconvenience to component selection and wastes materials

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