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Seismic reinforcement

Seismic reinforcement

In mid-August 2012, seismic resistance tests were performed for sections of brick buildings of conventional type construction versus those retrofitted by FibARM carbon tape SRS developed by HC "Composite". This technology is aimed at reinforcement of various buildings and facilities, including seismic retrofitting.

As much as a quarter of the Russian territory that includes 27 sub-sovereign entities with a total of about 20 million people is considered to be seismically vulnerable. The above data was given by Prime-Minister Dmitry Medvedev during a meeting on buildings seismic retrofitting held in Petropavlovsk-Kamchatsky on July 4 2012.

"As per a long-term seismic forecast, the most vulnerable territories are the Petropavlovsk-Kamchatsky region, where we currently are, and the Northern Kurilies. We have to mitigate all the possible risks – certainly, we will not be able to eliminate them altogether but we have to at least try to minimize them, to ensure safety for our citizens, sustainable operation of our industrial enterprises, social facilities, and infrastructure.

The Russian Premier emphasized that over 50% of residential, social, industrial, and infrastructural buildings and facilities are not sufficiently seismic resistant.

"In some regions this number is even higher: on the territory of Kamchatka it is above 80%, in some cases it's as high as 90% (of buildings and facilities are not sufficiently seismic resistant). This is bad, and the situation must certainly be improved".

Already now the objective can be achieved with the help of advanced technologies that surpass traditional seismic retrofitting methods by far.

In mid-August, seismic resistance tests were performed for sections of brick buildings of conventional type construction versus those retrofitted by FibARM carbon tape SRS developed by HC "Composite". This technology is aimed at reinforcement of various buildings and facilities, including seismic retrofitting.

The experiment was carried out on the only shaking table in Russia capable of simulating magnitude 10 earthquakes. It is located on the testing ground of the Ministry of Emergencies in Leningrad Oblast.

Two brick building sections were placed on the shaking table. One of the test samples was retrofitted by FibARM SRS. FibARM carbon tapes were used to retrofit load-bearing structures: walls, columns, floor slabs, and slab joints.

The test program included 6 dynamic impacts of 6 - 9 point intensity applied to the sample structures.

The brick partition of the non-retrofitted sample collapsed after magnitude 7 shakes. At the moment the earthquake magnitude achieved 9, the central brick column became seriously damaged which resulted in destruction of load-bearing walls and floor slabs.

The carbon tape retrofitted sample behaved quite differently. The artificial earthquake has not caused the slightest damage to it.

An experiment carried out in June showed similar results. Reinforced concrete structures were placed on the same shaking table. Similarly to brick structures comparison, one of the elements was retrofitted with carbon materials. As soon as the artificial earthquake magnitude peaked 9 points the non-retrofitted building was destroyed completely.

Head of new Product development in Construction Group, HC "Composite" Tatyana Lyagusha

Test results were as we had expected. Unreinforced building sections placed on the shaking table are not sufficiently seismic resistant. About 80% of all buildings and structures in the Russia seismic areas are similar to these. As a result of the artificial earthquake achieving magnitude 9, the non-retrofitted section was destroyed completely. Meanwhile the section retrofitted with the SRS was not damaged. Our view is, if an unreinforced building that can withstand a 7 point magnitude earthquake is retrofitted with carbon materials, it is highly likely to then be able to withstand a magnitude 9 earthquake. Which means people will be safer.

It is outside our control to prevent disasters such as catastrophic earthquakes. However, the application of new technologies can ensure improved protection for buildings and facilities during outbursts of nature.

FibARM

System of external reinforcement

The reinforcement system based on a carbon cloth can restore and increase the carrying capacity of structures in a short time and less effort than traditional methods, as well as significantly increase the life of the structure.


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