Ações evolutivas em edifícios de paredes de concreto e de alvenaria, considerando a interação com o solo

Analysis of structural masonry buildings taking into account the construction sequence loads and soil-structure interaction

“…Santos [4] used DIANA® software to confirm Prado's results [12]. The author found that the vertical reactions in columns tend to be smaller in sequential analysis, while in relation to the normal stresses on masonry, analysis of the construction effect showed a significant influence only on the first floor.…”

“…Figure 5 to Figure 7 show the layout of the reinforced concrete support structure, the masonry first course (highlighting the walls used in analysis), the foundation details, and the building discretization. For purposes of assessing the results, the same subjective interpretation adopted by Testoni [3] and Santos [4] was used, based on NBR 8681 [39]. According to Santos [4], with coefficient ϒf for normal combinations of 1.4 and adopting ϒf1 = ϒf3, it results that ϒf3 is the square root of ϒf, assessed at 1.18.…”

“…For purposes of assessing the results, the same subjective interpretation adopted by Testoni [3] and Santos [4] was used, based on NBR 8681 [39]. According to Santos [4], with coefficient ϒf for normal combinations of 1.4 and adopting ϒf1 = ϒf3, it results that ϒf3 is the square root of ϒf, assessed at 1.18. Based on these findings, it is assumed that variations up to 18% are covered by the safety factors (SF) of the design standards, corresponding to the deficiencies of the calculation method applied.…”

“…Based on these findings, it is assumed that variations up to 18% are covered by the safety factors (SF) of the design standards, corresponding to the deficiencies of the calculation method applied. For purposes of qualitative analysis, the same variation ranges for the differences used by Santos [4] were applied, as depicted in Table 5.…”

“…Item 11.5 of Brazilian Standard Code NBR 16055 [1] makes it mandatory to analyze soil-structure interaction (SSI) in buildings constructed with concrete walls and more than five floors high. In the case of Brazilian standard NBR 16868-1 [2], concerning structural masonry buildings, there is no mention of the need to incorporate soil-structure interaction in analyses, but recent studies, such as those by Testoni [3] and Santos [4], report that soil interaction provokes significantly changes in the stress flow in walls, thereby producing more realistic results.…”