For large-scale and complex steel structure system, nondestructive load test can be carried out on site to directly and intuitively test the structural performance.The actual load test of steel structure performance can be carried out according to relevant regulations or adjusted according to specific conditions.

In order to test the bearing capacity of steel structure or component, prototype or full-scale model loading test can be carried out.Testing shall be entrusted to a specialized agency with sufficient testing capacity.A detailed test plan shall be prepared before the test, including test purpose, selection and manufacturing of test pieces, test equipment, test point arrangement and test instruments, test procedures and evaluation methods of test results.The test plan can be prepared according to the actual situation and shall be approved by the relevant units before the test.

There are five ways to avoid deformation of steel structure:

In the manufacturing of steel structure, several key points shall be properly set according to the actual welding length, which is convenient for loading and unloading, with the advantage that it will not cause deformation of steel members and coating falling off; in the transportation process, attention shall be paid to the speed to prevent collision between steel structure members; a proper amount of sleepers shall be padded under the members, when the vehicle is loaded.How to protect the steel structure during hoisting?That is to say, it is packed in bundles; when loading, we need to lay a layer of bamboo veneer under the parts.

Steel structure is widely used in large factory buildings, sites, super high-rise buildings and other fields, but after a long time of corrosion, steel structure will produce corrosion, so people gradually understand the method of rust removal.

Rust can be removed by hand.The commonly used methods are blade, scraper, wire brush, emery cloth and hammer.The old paint film, rust, grease and ash on the surface of Guiyang steel structure can be removed by shovel grinding and sand grinding.Its advantages are convenient operation, not limited by the size of the layout, and its disadvantages are high labor intensity, low power, and difficult to guarantee quality.The advantages of mechanical derusting and wind power derusting are that the derusting quality and power technology are improved, and the labor intensity is reduced.

Sandblasting is to use air compressor to sandblast the steel structure surface to remove the black skin and rust on the steel structure surface. It can also use steel sand and steel nine (bulge) to sandblast the steel structure surface, which has a good effect and can reduce the filling of sand and dust. The disadvantage is that although the quality is good, the working conditions are poor.

What are the requirements of steel structure?In the design, in order to avoid the weld crossing in the steel structure, the weld should not be expanded arbitrarily, and a large number of welds should be concentrated in one place.At the same time, the arrangement of the weld should be symmetrical to the center of gravity of the component as much as possible.At the butt weld of steel structure, when the width or thickness of the weld is different or the difference is greater than 4mm, a slope of less than 1:2.5 shall be formed from one side or both sides of the width direction or thickness direction respectively; when the thickness of the weld is different, the groove form of the weld shall be selected according to the thickness of the thinner weld.Weld metal shall be compatible with basic metal.When connecting different strength steels, welding materials suitable for low strength steels can be used.