Steel Floor Design - Drawings

Contents

Contents:

9.

9.

9.

9.

9.

Introduction

Defining General Dimensions

Roofing elements

Determining the Loads Acting on the Truss

Defining Support Reactions

Influence lines

Calculation and Design of Truss Nodes

Support unit

Intermediate node, lower belt

Intermediate node, upper belt

Upper Enlargement Unit

Lower Enlargement Unit

Connecting gaskets

Coverage Links

Check calculation of rafter truss

Definition of structural coefficient

Conclusion

List of literature

Introduction

Metal structures are used in all types of buildings and structures. They have many advantages that allow them to be used in various structures. The reliability of these structures is ensured by the coincidence of their actual work with the calculated assumptions. When using a truss instead of other metal structures, under equal conditions, the metal consumption is noticeably reduced. It is also easy for them to give any shape.

The disadvantages of metal structures are corrosion, inability to withstand dynamic loads, are chemically active and vulnerable to high temperatures. All this reduces the field of application or increases the cost of metal structures.

Defining General Floor Dimensions

The general dimensions of the farm are its span and height.

The distance between the axes of the columns of neighboring rows in the transverse direction is called a span.

Span length of rafter truss L = 24 m.

When the building is larger in plan, large additional stresses from temperature changes can occur in the frame elements, so in these cases the buildings are cut into separate compartments or blocks with transverse temperature welds. The dimensions of the building are 96x48x12m.

We take L1 = 60m, L2 = 36m.

Distance between columns in longitudinal direction (pitch of columns) t = 6m. At the ends of the building, the columns are usually shifted by 500 mm, for the convenience of designing the corners of the building with standard bounding plates and panels (Fig.2).

From the recommendations [1, c5], the H/L ratio is taken within 1/8... 1/12, but not more than 3.8 m. We accept the slope of the upper belt 1/8 and the height of the truss in the skate H = 1/( 8L) = 3m. Figure 1 shows the geometric dimensions and type

Distance between columns in longitudinal direction (pitch of columns) t = 6m. At the ends of the building, the columns are usually shifted by 500 mm, for the convenience of designing the corners of the building with standard bounding plates and panels ( Fig.2).

The width of the building is 48 m, therefore, we accept two span floors.

For the possibility of transportation by rail, the size of the structure should not exceed: vertical-3.8 m; horizontally - 3.2m. The length of the four-axle platform13 m

Roofing elements

In industrial structures, warm and cold roofs are distinguished. The warm roof differs from the cold roof in the presence of insulation.

There are two types of coverage - with runs and no-run. In the first type of coating, steel profiled flooring, reinforced cement and asbestos cement slabs are widely used as carrying elements laid along the runs.

In our case, the roof is warm running. This type of coating consists of steel sheets laid on the runs, insulation, waterproofing and protective layers.

Conclusion

In the course of the course, a rafter truss was designed with a trapezoidal shape of the truss belts and a braced downward with single-tier springels type of grille. The constructed rafter truss was tested for rigidity, the necessary rigidity was provided. Also, a constructive coefficient was determined, which amounted to that within the norm.

List of literature

1. Sovetchenko B.F. Designing the steel floor of an industrial building: Met. allowance, - Tomsk; IzdTPU, 1999.56s.