FILLING OF THE DEFORMATION JOINTS BETWEEN THE FRAMEWORK AND THE NON-CARRYING WALLS WITH COMPRESSIVE LOAD
DOI:
https://doi.org/10.31713/vt3201913Keywords:
seismic resistance, load bearing capacity, deformation joint filler, low cycle loadAbstract
The purpose of this article is to study the behavior of various types ofanti-seismic joints fillers between frame elements and non-structuralwall infill on the behavior of multi-storey buildings with a reinforcedconcrete flat-slab frame under seismic effects. Reinforced concrete buildings are predominant type of construction in developingcountries like Ukraine. Seismic performance of these buildings, is notpredictable through techniques based on secondary factors such asshort column, irregularities in plan and elevation, soft and weakstories, strong beam–weak column can causes serious damages. Andalso all this factors can be caused by irregular non-structural wallinfill. And if much attention is paid to the study of non-structural wallinfill effect, then the issue of the expansion joint between the frameand the filling remains unexplored. Also this problem is caused bycontradictions in DBN B.1.1-12-2014, which limits the gap between theframe and non-structural wall by 20 mm. But for a typical floor, wesee that the frame works normally and at 50 mm (according topushover analysis) displacements of the floor. Thus, the required20 mm gap does not perform its function. To determine the degree ofimpact of the non-bearing walls on the reinforced concrete frame, anexperimental program was developed that includes two steps. Thefirst stage is to determine the degree of impact of filling the joints. Thesecond stage is testing the wall fragments, taking into account theeffect of filling the deformation joints. This study focuses on the firststage. In this paper the influence of the joint filling was analyzed usingthe three most widely used types in Ukraine: mineral wool,polystyrene foam and vilatherm. The objects of study are threeaerated concrete prisms and one prism made of heavy concrete withfilling material. Displacements from vertical loads on test samplesare key parameters for determining the effect of joint filler on thebehavior of buildings during earthquakes. The second parameter,which was also analyzed, the change of geometric form and completedestruction of the joint filler. This study was undertaken to developthe future Ukrainian Rapid visual screening assessment procedurethat takes into account the influence of anti-seismic joints fillers.References
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