Beam string structure

Abstract

The invention relates to a string beam, which comprises a rigid beam, a bracing cable and a plurality of bracing bars, the upper ends of the bracing bars are hinged with the rigid beam, the lower ends of the bracing bars are fixedly connected with the bracing cable through rope clamping devices, the both ends of the bracing cable after being stretched are respectively and fixedly connected with the both ends of the rigid beam, the bracing cable is formed into broken lines in an axle symmetrical way, the adjacent two broken lines form a broken line angle, the various turning points of the broken lines are positioned on the identical parabola, each bracing bar is respectively positioned on the angle bisector of the broken line angle. The string beam of the invention can avoid the loose bracing cable generated by the slipping of a pre-stressed rope at the position of the rope clamping device when being used, and the potential safety hazard is eliminated.

Description

technical field [0001] The invention belongs to a building structure, in particular to a tension beam. Background technique [0002] At present, there are more and more applications of long-span steel structures in the field of civil engineering. However, with the increase of the span, the self-weight increases sharply, and the structure faces the contradiction of the mutual restriction of the use function, design rationality and economic indicators. In order to satisfy the function of the structure and reduce the self-weight of the structure to improve the rigidity of the structure, prestressed string beams equipped with cables are more and more used in long-span steel structures. Through the arrangement of prestressed cables and struts, the bearing capacity and stiffness of the long-span steel structure have been greatly improved. The existing string beams include: steel beams or steel trusses 1, several struts 3 and stay cables 2, wherein the upper ends of the struts 3 ...

AI Technical Summary

Problems solved by technology

[0003] In general, there is one or more layers of PE protective layer on the surface of the cable, which is chemically unstable compared to steel, so even if the friction between the cable clamp and the cable is large enough during construction, it can be used for a certain period of time. Keep the struts vertical, even if the friction test was done at that time, and the requirements were met, due to the chemical instability of PE, after several years (possibly within the reasonable service life of the structure), due to its chemical changes (such as Chemical decomposition, aging), it may happen that the cable slips at the connection point between the brace and the cable, causing the cable to become loose, thereby creating a structural safety hazard (this phenomenon has been completed in some string structures in the early years system engineering)

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