After the linear cable bears the wind load, it is inevitable to produce deflection. Only after the deflection can the cable transfer the wind load to the support. The greater the deflection, the stronger the wind resistance ability. Restricting the deflection of the cable is to limit the wind resistance of the cable, so the deflection of the cable is a necessary condition for the wind resistance of the cable, which is a significant feature of the wind resistance of the linear cable and the plane cable net that is different from other structures. A certain pre-tension should be applied before the wind resistance of cable. The greater the pre-tension, the smaller the deflection response and the better the stiffness, but the total tension of the cable also increases, the safety factor of the strength of the cable itself decreases, the difficulty of curtain wall construction increases, and the burden of the surrounding supporting structure also increases, so the pre-tension should not be added too much. If the cable tension is too large, the strength safety factor of the cable itself can not meet the safety requirements, only by increasing the cable cross section.
In the design and construction, it is often necessary to adjust the section, and it is generally believed that it is always safe to replace the small with the large. This can be done for the point support curtain wall, but it is not necessarily safe for the cable structure, because after the increase of the cable section, the deflection response decreases, and the cable force increases, and the safety of the surrounding structure may be threatened, so it must be re-analyzed after the adjustment of the section.
Conventional structure of the relevant specification, from the perspective of use, limit the deformation of structure, because of the limitation of this will not affect the structure bearing capacity of the play, but for straight line cable, it must be allowed to produce large deflection deformation, only had a large deformation, the wind resistance of curtain wall facade is produced, which will receive the good effect of wind resistance, direct clues to the structure can only sustain tension.
It can not withstand pressure and shear force, only allowing the cable structure to produce large geometric deformation in order to have the ability to wind resistance. Controlling the pre-tension of glass curtain wall is the key factor to influence the wind resistance and economic effect of cable structure.
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Post time: Jul-18-2022
