fischer Rögzítőrendszerek főkatalógusa Seite 656
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Basic knowledge of fastening technology Cracks in concrete components. Cracks can occur anywhere in concrete at any time: Factors involved in this are loads such as dead loads, traffic or wind loads, concrete shrinkage and creeping or external influences such as seismic activity or ground motion result in stresses and deformations thus leading to cracks. Example If a bridge designed as a single-span element is loaded, the bridge will buckle. Due to this buckling, cracks could occur in the element’s tensile area. Tensile zone Cracks in tensile zone Pressure zone Tensile zone Tensile zone Concrete is not able to support tensile loads, therefore, reinforcements are placed in the element to take the tensile load area numerous cracks are formed that are barely visible to the naked eye. This is called the cracked tensile zone. 16 Suitable anchor systems for cracked concrete When fixing in concrete, cracks are always expected in the anchoring area which will have an impact on the load bearing capacity of the anchor system. However, it is very complicated, if not impossible, to prove whether the concrete is cracked or not cracked. For safety reasons, designers and craftsmen should always use anchor bolts which are suitable for cracked concrete. Fixings with an approval/assessment according to EN 1992-4 for cracked concrete have proven their suitability in cracks, therefore they can be used without any restrictions in tensile and compression zones of a concrete member. Undercut anchor FZA Threaded rod FHB II Bolt anchor FAZ II Due to safety reasons, always use crack-suitable anchor systems such as FAZ II, FH II, FHB II, FIS SB, FIS EM Plus, FIS V or FIS V Plus. 656 Frame fixing SXRL
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