Our country, located in one of the most earthquake-prone areas in the world, has experienced more than 30,000 earthquakes in the last century, of which about 160,000 have been reported victims of major earthquakes during this period.
Currently the dominant construction method in the country is the traditional one which is uncontrollable in quality and it is very difficult to interfere and improve its technical specifications. For this reason it also has a shorter lifespan. Also due to the lack of proper management and precise planning, the cost of traditional methods versus the end product is expensive and overall time consuming. Increasing the price of energy carriers resulting from targeted subsidies and increasing wages for workers due to the use of traditional methods has significantly increased the cost of these methods.
Not only have we been dealing with this issue in Iran, but the industrial world has also experienced it. Their efforts to meet demand growth, supply good quality and reduce building costs have been shaped by modern and creative engineering techniques and fortunately transferable to Iran with much less effort than the initial effort of the industrial world. In order to create it.
In the industrial way, parts and components of the building under the industrial system are manufactured in the factory and are transported to the workshop site in various aspects in terms of quality. This reduces the volume of building operations at the site and increases production. In addition, in terms of mass production, prices are lower than traditional products, and products are of consistent and predictable quality. One of the most important issues in industrial production is drying to increase speed and reduce outflow (and lightening) to reduce the energy required and reduce the inertia generated by the earthquake acceleration.
Industrialization in advanced countries has been able to gain a great deal of its share of a significant share of building production. In our country, this share is very small and needs the support of those who work harder. Considering the necessity of industrialization of the building and the importance of explaining its true position among the industries of the country and with the support of the government to implement part of the country’s vision policy and development plans, identifying potential and actual internal and external potentials seems necessary. arrives.
The LSF abbreviation of the words Light Steel Frame Frame Means Cold Rolled Steel Frames
Lightweight steel structure system used today in the world. The main factor is in steel structures. Thin wall steel sections, lightweight metal sections (LGSs) are cold rolled thin steel sections formed by the use of thin steel sheets by the roll forming method. Manufacture Roll Forming sections and use this method in a very high volume, with good quality and uniform. The steel sections are thin and lightweight and easily portable. Different parts of the building can be easily assembled with these sections. These factors make the construction of the system very fast.
The LSF will undoubtedly gain a better position in the construction market, as this type of building is much more cost effective than other standard methods. All in all, given the new conditions in the world and with all the environmental considerations, economic justifications, various climatic conditions, energy issues, manpower required to carry out construction projects and finally the subject of building operation, the LSF method It is recognized as one of the most appropriate construction methods in the world today. These factors clearly demonstrate the competitiveness of this construction system with other construction systems so that the acceptance of this approach, with nearly a hundred percent growth, tops the various construction methods in the world.
The philosophy of engineering in this type of building is to replace the weak but numerous elements with the strong but low elements so at the time of the earthquake even if part of the building is damaged, other parts will compensate for the defect. LSF buildings are lightweight, by comparison, the weight of LSF buildings is one-sixth of concrete and one-fifth to one-quarter of metallic buildings, and since the lighter one is, the less power it absorbs, thus minimizing damage when an earthquake strikes. Sees. Now with the help of quantum technology, it is now possible to design LSF buildings in the modest, shapable conditions we have designed. It also minimizes the role of manpower and possible errors in measurement and installation by producing mechanics based on engineering design. This way a building is built that performs better.
Advantages and disadvantages of LSF structures
It was said that the LSF structure has many advantages over other structures. For example, due to the low weight of these structures (5% by weight of ordinary structures) the risk of earthquake is also much lower. Or, for example, the speed of construction of buildings that are built with LSF is very high, and this is good news for investors who do not want to spend too much time building a regular building.
Energy consumption in buildings built with LSF is less than in conventional buildings, which means that long-term profits will benefit residents of the building as it saves energy and results in bills. .
There are fewer design constraints for buildings to be constructed from LSF structures, and the engineer’s hand is more open to designing a specific design than for a typical building.
The LSF structure can be installed on site at any season and in any climate, and this is one of the benefits of this type of structure (you know that the LSF structure is built in a workshop or factory and transferred to the installation site after installation. ().
Other advantages of the LSF structure include the use of dry walls in comparison to the wet walls in ordinary buildings. In conventional buildings, the use of wet walls can have disadvantages such as being heavier and consequently absorbing more earthquake force, excessive pollution during construction and demolition, as well as the large amount of waste that remains after using the materials. However, buildings using LSF structures have dry walls, which absorb less earthquake force and do not have any pollution or waste. In addition, they are installed very quickly.
However, there are some disadvantages to the LSF structure. For example, there are limitations on the dimensions of the crater in this structure, or those who have to use these structures must be very professional and expert in their use, not everyone, or for example the buildings they build from this. The type of structure used must have limited classes and no LSF structure can be used for any number of floors.
The overall benefits of the system
Thin wall steel sheets are highly resistant to corrosion, tilting and cracking.
To construct a building with this system, the lengths of a sheet pulley are produced to the required sections, and therefore the material is minimized.
The materials needed to build this system are at least 5 percent lighter than conventional construction materials.
The building’s skeleton components are manufactured and assembled at the plant site under controlled conditions and then transported to the site for installation. This method ensures proper quality control and speeds up the installation of the system at the workplace.
Dimensional stability: The sections are perfectly smooth and uniform and have the same quality.
Fire resistance: Steel sections are non-combustible materials. These materials do not burn and do not spread the fire in different areas of the building.
Strength: Cold rolled thin-walled steel sheets have the highest weight-to-weight ratio compared to other building materials.
Variety of Facade Materials: The exterior surfaces of the building with the LSF system can be covered with the types of exterior materials the project architect wants. Usable facades include building materials and bricks, types of facade stones, aluminum facades, facades and more. On the interior surfaces of the building, wooden PVC, ceramic materials, facades are attached directly to thin-walled steel elements and wall-plaster panels.
Meeting the requirements of building performance standards: The system can easily meet the highest standards of lightweight steel structures for structural design, energy, fire resistance and acoustic performance.
System Speed: The LSF is a fast and easy system. Due to the light weight of lightweight steel structures compared to other conventional materials, the elements are easily portable and easy to install, resulting in extremely high operating speed.
Low stopping time: Because this system is capable of being installed in all weather conditions such as dry air and extreme cold and also requires a little time to install in the workshop, so it can usually be used in all seasons and years. He installed this building system in all weather conditions.
Parallel and uninterrupted activities in other parts of the building: Because the structural system of the building and its exterior coatings are installed very quickly, so other building activities such as mechanical and electrical installations and indoor surface finishing work can Be independent and as the exterior is completed.
Ease of installation: All power cables, water pipes and ducts can be easily installed in the open space inside the walls before installing gypsum panels.
Low equipment requirements in LSF components: Because lightweight, portable system components are transported to the workshop, no special machinery is needed to move and install the system. The equipment needed to install this system is limited to a series of portable base equipment.
Low Workspace Requirements: Due to the delivery of construction parts in a timely manner and the availability of most parts for installation, there is very limited space required for the maintenance of parts and the least possible loss of materials. So running on small, limited sites is easy.
Workplace Safety: Due to the lightweight parts, no special equipment and machinery is required and the level of work required is limited so it ensures the safety of the individual and staff in the workshop.
Reduce costs: In addition to the above benefits that reduce running costs, the engine volume and capacity of the LSF system is reduced due to the good thermal performance of the heating and cooling system and reduces the cost of installation systems.
Lower operating costs: The LSF will impose lower operating costs on the resident system. Due to the durability of the materials and the good thermal performance of the system, residents will pay less for repairs as well as for cooling, heating and the building environment.
Good sound performance: The soundproofing of the LSF system reduces the intensity, as well as the built-in acoustic insulation of the wall. In this system the interiors of the building are very comfortable and comfortable.
Environmental Health: Due to the compatibility of the materials used in this system with the human environment, and the materials being ineffective, there will be no toxic vapors in the environment. By controlling and blocking the air inlets, the indoor air quality system can be controlled and optimized. There will be no problems like mold on the wall components in this system.
The world’s most ideal system for medium and short height buildings
Precision structural calculations using specialized software
Excellent performance against wind, storm and earthquake lateral forces
Highly resistant to corrosion, tilting and cracking
Parallel and uninterrupted activities in other parts of the building
Ease of installation of installation systems
Low need for workshop equipment
Requires low workshop space
High quality construction compared to other construction systems
High precision and incomparable detail execution
High diversity and flexibility in architectural and interior design
Has all energy saving standards and lower operating costs
Robustness, safety, durability, high degree of uncertainty and outstanding building reliability
Throw out the least possible materials
Increase the useful interior space of the building over conventional steel structures
Fireproof complies with all regulations of the world
Reduce operating costs and ease of maintenance compared to other methods
Completely economical with more productivity and faster return on investment
Fast installation and execution speed, applicable to any non-stop executable
Reduce waste, save and optimize the use of materials and manpower
Extend the useful life of the building and fully comply with Iran’s climate
Industrial and modular production, cost savings and downtime
Applicable to the construction of new floors as well as retrofitting existing buildings
Ideal for mass housing and the most desirable housing pattern option in advanced countries
Ability to select and access quantities related to building physics (such as acoustic performance, thermal and wall fire behavior)
Ensure quality is achieved with step-by-step monitoring
Wooden structures require a large number of trees to be cut, as well as some building materials that cannot be recycled, but the steel structure is fully recyclable and recycled steel can also be used to produce the structure. About 435 million tons of steel is recycled worldwide annually, equivalent to 150 Eiffel towers per day.
These buildings have the least amount of materials and energy during construction and waste the least energy during operation. In addition, many of the materials used in this type of building can be returned to nature or recycled at the end of the building’s life. LSF buildings around the world are known as environmentally friendly buildings.