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We offer a full range of steel building products starting from steel roof and wall frames, steel flooring, downpipes, gutters, purlins, and more.
Steel roofing and walling
We offer customized roof and wall steel frames, which are easy to install and comes with the instruction menu. There are different sizes and shapes available, which are suitable for different constructions needs. These frames are lightweight and more stable than any other material. Therefore, they are great for roof and wall structures.
Steel framings and floorings
The floor framing should be perfect as they are base of any construction. Therefore, steel framing and flooring are very common as they can hold the walls effectively.
To carry out the vulnerability analysis of an existing steel structure, the first phase is the planning of the investigation campaign to reach an adequate Knowledge Level of the structure. In today’s article I talk about the levels of knowledge required by the NTC 2018 for existing steel structures and the on-site tests and investigations to be performed for each level of knowledge. At the end of the you will be able to download a PDF handbook containing all the regulatory requirements relating to the investigations to be performed. If you happen to analyze existing steel structures, don’t miss out on today’s post.
Knowledge levels and confidence factors
As with existing masonry and reinforced concrete structures , even for existing steel structures, the Technical Standard defines three levels of knowledge:
As the level of knowledge grows (from LC1 to LC3), the information available on the structure will increase, regarding the properties of the materials and the construction details . Each Knowledge Level is associated with a Confidence Factor FC that will be used to reduce the strength of the steel. As the level of knowledge increases, the reduction in mechanical parameters will decrease by applying the corresponding Confidence Factors shown below:
- LC1 ⇒ FC = 1.35
- LC2 ⇒ FC = 1.20
- LC3 ⇒ FC = 1.00
- Rd = R / FC
Rd = design resistance to be used in verifications;
R = resistance obtained from on-site tests or from the original project specifications;
FC = Confidence factor.
Reduced material strength for the FC confidence factor
Preliminary analysis of the structure
One of the novelties of the NTC2018 concerning the existing structures is the introduction of the preliminary analysis of static safety and seismic vulnerability following the geometric survey of the structure. This analysis is preliminary to the correct planning of the number and location of on-site investigations and the tests to be performed. From the results obtained from the preliminary analysis we will be able to evaluate the level of static commitment of the individual structural elements and decide for which type of element to increase the number of necessary investigations and where to locate them.
Steel is a very good solution and widely used both in new building and in renovations. From the design point of view, steel construction is a simple process; the real challenge is to fully exploit the characteristics of this material, in particular its ductility. The Technical Standards define which performance to guarantee for steel structures precisely taking into account its particular capacities, especially in the presence of seismic actions.
What are the crucial phases to be respected to guarantee a good result, also taking into account horizontal actions such as wind and earthquake?
We can say that we are designing with steel, we need to correct the structural behavior of the building, to analyze the instability of the building.
Design steel structures
Design of a steel structure
In this focus we reconstruct the workflow needed to design and verify a steel structure, inspired by Italian and European regulations references.
- The materials
- The static scheme
- Actions on the building
- Structure analysis
- Global audits
- Local audits
- The connections
- Each phase of the project can be done with the module STEEL of TRAVILOG.
The choice of construction is regulated and guided by chapter 4.2 and 11.3 of the Technical Standards for 2018
The Italian Legislative Reference Guide to the Construction of the Steel Industry
The FYK and the Characteristic Breakdown Voltage Ft. the most specific reference is the UNI EN 10025 which classifies the characteristic tensions of the steels according to the chemical composition and therefore to the specific and particular uses that will be adopted. The nomenclature to refer to supplies of steel is of the type: S 235 JR + C + N
S construction steel
235 yield strength characteristic in N / mm²
JR alphanumeric indications related to resilience
C additional symbol for use
N additional symbol relating to the supply condition
Below, as an example, the mechanical characteristics of the supply chain according to the indications of UNI EN 10025.
Other steel building accessories include downside pipes, gutter, purlins, and steel fencing. Without them, any building construction is incomplete. We are eager to provide your required accessories at the time and your place. We also guide our customers in case of any query. Let us know the problem you are facing regarding the material we will do the best to help.