Author and researcher : Alireza Zarvandi has a degree in civil engineering and a master's degree in construction management from Sharif University of Technology
Brief description of the article: In today's era, due to the lack of accurate prediction of the time of the earthquake, and due to the existence of a large number of residential units, schools, hotels, guest houses, and other public and private facilities, etc., whose roofs are made of other materials It is made of reinforced concrete, including concrete, bricks, block beams, etc., it is a very important issue to save human lives and residents of residential units from earthquakes.
This matter was started by me under the title of a research and implementation issue in the summer of 1403 and after consulting and scientific and engineering discussions with some respected professors of the Faculty of Civil Engineering of Sharif University of Technology and other field studies and investigating other scientific issues using the experiences of scientists and researchers. other countries and also by examining the accidents caused by earthquakes that cause the death of people (including the separation of bricks or blocks or materials from the roofs of the houses on the heads and bodies of the residents, which causes irreparable injuries.) especially considering Potential risks in big cities such as Tehran, Mashhad and Tabriz, which are located on the earthquake fault.
After the investigation of the mentioned incidents and according to the investigation of vertical and lateral forces during an earthquake from the 2800 earthquake standard and according to the investigation and testing of meshing of several workshop structures, a network with the transverse and longitudinal matrix method of A3 rebar with size 10 and 8 mm And the yield strength is 450 Nm and the final strength is 670 Nm. It is designed according to the old structure of the building, welded and installed to the old roof, and then on this steel matrix, a thinner network with the Rabits brand is connected and finally by spraying concrete or plaster. Work is performed on a 3-layer network.
Advantages of RSF: This design increases the life, strengthening, integration, and distribution of all kinds of forces in the roof of houses/ it is a green industry because all the materials used are recycled/ it has a much higher safety than the old situation and the roof. and people's lives and property are safe.
RSF practical tests performed: in the sample performed: with a picor with a power of 50 kilonewtons per impact and with a hammer head area of 10x5 cm:
First, a part of the old roof was hammered with Pekor within 10 seconds with the mentioned specifications, but in the RSF roof, after 15 seconds of Pekor, the bricks cracked, but no material fell into the house.
This test, whose point vibration is more than 2 times the vibration of a 7-magnitude earthquake in the roof, shows that the RSF system designed to prevent materials from falling on the residents' heads is very suitable.
Target buildings of the project:
1- The best buildings for the purpose of the project are multi-storied buildings with an iron frame and a pitched roof
2- In the second degree, old schools, mosques and hotels with iron beam + brick roof
3- Other semi-frame metal buildings with bearing walls and 2-story villa buildings
