Simply-supported type wind tunnel testing device for resistance coefficient of long and thin member

Abstract

The invention discloses a simply-supported type wind tunnel testing device for resistance coefficient of a long and thin member. Force measuring sections with the same structure are symmetrically arranged at the left and the right of a test section of a building wind tunnel; force measuring balances are respectively fixed above two supports, clamping seats are respectively fixed above the force measuring balances, the two supports are fixed on a ground of the test section, and openings of the two clamping seats face a blowing direction. An arc-shaped rubber sheet is arranged at the bottom of aguide surface of an opening on a rear side surface of the two clamping seats, and size requirements of round rods at two ends of a test piece of the long and thin member are smaller than a diameter of the arc-shaped rubber sheet; the round rods at the two ends of the test piece are placed on the arc-shaped rubber sheet of the two clamping seats through the guide surface so as to form a simply-supported type force measuring system; and two two-dimensional flow isolation boxes are respectively covered on the respective force measuring section to form a two-dimensional flow effect, and resistance of the test piece is obtained through the force measuring balances at two sides, so that the resistance coefficient of the test piece is obtained. By the adoption of the simply-supported type wind tunnel testing device for the resistance coefficient of the long and thin member, the resistance coefficient of a long and thin rod piece is tested, defects of a traditional testing device are overcome, and a new way is provided for a wind tunnel force measurement test of the resistance coefficient of the long and thin member.

Description

technical field [0001] The invention relates to a wind load testing device, in particular to a simple-supported wind tunnel testing device for the drag coefficient of a slender member. Background technique [0002] In order to ensure the wind safety of buildings and structures, it is necessary to accurately obtain the resistance coefficient of these buildings or structures, which is usually obtained by model force measurement in a wind tunnel. Slender components are very common in these buildings or structures, such as columns, multi-columns, single-heeled transmission lines, multi-split transmission lines, plane trusses, three-dimensional trusses, bridges, etc. Usually, the full-scale or reduced-scale models of these long and slender components are made, and the test model of a specific length is intercepted in the wind tunnel to carry out force-measuring wind tunnel tests considering the two-dimensional flow effect. [0003] There are usually two kinds of devices in previ...

AI Technical Summary

Problems solved by technology

For such as figure 1 For the cantilever type force measuring device shown, due to the high wind speed in the wind tunnel, the suspended end swayed greatly in the wind tunnel. At the same time, due to the large sway of the test piece, the wind receiving area and force direction of the test piece will change. Affects the test accuracy of the resistance of the specimen

For such as figure 2 The two-end fixed-support type test device shown, since both ends are fixed ends, will form a super-statically indeterminate structure. The results of the balance at both ends will affect each other, and will also affect the test accuracy of the resistance of the specimen

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