Warehouse Q235B Low Tolerance Steel Structure Building
Brand Name:KAFAFAB
Certification:BV,SGS
Model Number:Steel structure
Minimum Order Quantity:20T
Delivery Time:6 weeks
Place of Origin:China
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Qingdao Shandong China
Address:
Dazhushan Industrial zone , Huangdao District, Qingdao City.
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Low tolerance high strength steel structure building
Introduction to Steel Structure Building
Structural steel is one of the materials used in any kind of steel structure, and it has a specific shape. These steels have certain chemical composition and appropriate strength standards. Steel is also defined as a hot-rolled product with cross-sections such as angle steel, channel steel and beams. Worldwide, the demand for steel structures continues to grow.
Compared with concrete, steel has great advantages because it has better tensile and compressive capacity, thereby reducing the burden on construction. The steel authority of a specific country/region is responsible for the supply of structural steel for construction projects.
There are various structures under the edge of the steel structure. These structures can be used for industrial, residential, office and commercial purposes. The purpose of the bridge is to be used for roads and railway lines. Structures such as towers are used for different purposes, such as power transmission, node towers for mobile networks, radars, telephone relay towers, etc.
Main parts of the steel structures and technical parameters:
| Main Steel Frame System | |
| Main structure | H section steel Q345, alkyd painting, two primary painting, two finish painting. |
| Roof purlin | XZ160*60*20*2.5, galvanized |
| Wall purlin | XZ160*60*20*2.5, galvanized |
| Intensive bolt | Grade 10.9 |
| Turn buckle bolt | M20+2, steel Q235, processing |
| Anchor bolt | M24, steel Q235, processing |
| Ordinary bolt | Galvanized bolt M20 |
| Ordinary bolt | Galvanized bolt M12 |
| Brace nut | Galvanized bolt M12 |
| Bracing System | |
| Cross brace | Φ20 round steel bar Q235, process and painted (alkyd painting) |
| Angle brace | L50*5 angle steel Q235, process and painted (alkyd painting) |
| Column bracing | Φ25 round steel bar Q235, process and painted (alkyd painting) |
| Tie bar | Φ127*3 steel pipe Q235, process and painted (alkyd painting) |
| Batter brace | Φ32*2.5, Φ12 round steel bar Q235, process and painted (alkyd painting) |
| Wall & Roof System | |
| Roof panel | Corrugated steel plate or sandwich panel (EPS/fiber glass/rock wool/PU) |
| Wall panel | Corrugated steel plate or sandwich panel (EPS/fiber glass/rock wool/PU) |
| Edge cover | 0.4mm color plate, angle Alu. |
| Fittings & accessories | Nails, glue etc. |
| Unpowered ventilator | Diameter Φ600, stainless steel |
| Sky lighting band | 1.2mm FRP, double layer |
| Sliding door | sandwich panel door |
| Roof drainage system | |
| Gutter | 0.5mm color steel plate |
| Rainspout pipes | Φ110 PVC pipe |
The structure can be divided into the following categories:
Frame building
Plate beam
Steel arch bridge
Industrial building
Transmission line tower
Advantages and disadvantages of steel structure:
Generally, the advantages of steel structure are as follows:
Steel has a high strength-to-weight ratio. Therefore, the weight of
the steel structure is relatively small. This characteristic makes
steel a very attractive structural material for some multi-storey
buildings and long-span bridges.
Plastic deformation will occur before failure. This provides
greater reserves. This property is called malleability.
The properties of steel can be predicted with great certainty. In
fact, steel shows elastic behavior up to relatively high and
usually well-defined stress levels.
Steel structures can establish high-quality relationships and
narrow tolerances.
Steel structures can usually be prefabricated and mass produced.
It can be quickly constructed in steel structures. This leads to
the economic construction of steel structures.
Good fatigue strength is also the advantage of steel structure.
If necessary, the steel structure can be reinforced at any time in
the future.
The ability to reuse steel structures is also an advantage.
Generally, the disadvantages of steel structures are as follows:
Steel structures are more expensive than other types of structures.
When heated at temperatures normally observed in a fire, the
strength of the steel is greatly reduced. Therefore, fire
protection is required.
Like bridges, steel structures are likely to corrode when exposed
to air and water and require regular maintenance.
Steel properties
Steel is an alloy of iron and carbon. By adding a small amount of
manganese, sulfur, copper, phosphorus, chromium and nickel, iron
can be given special properties, so various steels can be produced.
Generally, the effects of different chemical compositions on steel
are as follows:
The increase in carbon and manganese content will cause properties
such as higher tensile strength and yield strength, but lower
ductility and more difficult welding.
If the content of sulfur and phosphorus is increased to more than
the percentage, it will cause brittleness, which will affect the
welding ability and fatigue strength.
The content of chromium and nickel will cause the corrosion
resistance of steel, and can also improve its high temperature
resistance.
The corrosion resistance can be improved by adding copper.
Subtle changes in chemical composition will lead to the production
of various types of steel. This type of steel is used as structural
members, such as tubes, plates, tubes, bolts, rivets, steel bars,
etc.
The heat treatment and alloys used in steel production lead to
different properties and strengths. The mechanical properties of
structural steel are as follows:
tensile strength:
Generally, the stress-strain curve of steel is obtained by
conducting a tensile test on any standard steel sample. The tensile
strength of steel can be defined in terms of yield strength and
ultimate strength.
hardness:
Hardness is considered to be the resistance of any material to
identification and scratching. It is usually determined by pressing
the indenter against the surface. The resulting deformed steel is
both elastic and plastic. Different methods to find out the
hardness of metals include Brinell hardness test, Vickers hardness
test and Rockwell hardness test.
Notch toughness:
There is the possibility of microscopic cracks in the material, or
due to multiple loading cycles, the material may develop such
cracks. These cracks may cause the structure to collapse suddenly,
which is very dangerous. Therefore, to ensure that this does not
happen, it is best to use materials with slow crack growth. These
types of steel are called notched ductile steels, and the energy
absorbed is measured by impacting notched specimens.
Fatigue strength:
If the same load is applied multiple times periodically, structural
components designed to carry a single monotonic static load may
fail. If you consider the example of a thin rod, it will fail if it
bends back and forth beyond yielding after several repeated bends.
This type of failure is called fatigue failure. For example:
bridges, cranes, offshore structures, slender towers, etc.
Corrosion resistance:
Corrosion is a process in which metals will be oxidized under
normal atmospheric conditions due to excessive moisture and oxygen
in the air. In areas with high humidity and near salt water, metal
corrosion is a very natural and rapid phenomenon. Therefore,
efforts to control corrosion by using galvanized and epoxy-coated
steel bars have failed in actual use due to the risk of dissolution
leading to accelerated corrosion. Corrosion-resistant elements such
as copper, phosphorus and chromium are appropriately added to the
metal to form corrosion-resistant steel.
Warehouse Q235B Low Tolerance Steel Structure Building
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