Abstract
Soil-structure interaction (SSI) evaluates how soil or rock deformability imposes on the structure a different load path in a hypothesis of fixed supports, altering the loads acting on the structural elements and the ground. This paper discusses the results of the SSI effects in two buildings with a reinforced concrete structure and shallow foundations in a rock mass. The settlements were monitored by field instrumentation in five stages of their construction, making it possible to estimate through interpolation curves the settlements values of some points. The numerical modeling and structural analysis of the buildings were obtained for two different cases of soil-structure interaction. The structure was considered having fixed supports (non-displaceable) and displaceable supports (with stiffness spring coefficients K). The results reveals the occurrence of SSI effects, with a load redistribution between the columns that occurred differently for the different construction stages. Structural modeling proved to be quite representative, pointing to higher vertical load values than the average values present in building edge zones, which contradicts the conventional idea that central columns are more loaded than the edge columns. The soil-structure interaction analyses resulted in different behaviors regarding both towers; pointing out that low settlements and building symmetry in plan minimize the effects of interaction, with no tendency of load redistribution between columns as the structure rigidity increases, as construction development.
Highlights
Reinforced concrete structure projects are elaborated usually considering three distinct parts: the superstructure, composed of slabs, beams, and columns; the infrastructure, consisting of the foundation elements, and soil or rock mass, which support the requests coming from superstructure
Other analyses, such as the dynamic effects of vibrations and seismicity combined with soil-structure interaction in buildings (Papadopoulos et al, 2017; Amini et al, 2018; Gómez-Martínez et al, 2020) point to the idea that the SSI mechanisms play a considerable role on behavior of buildings, directly influencing the propagation of vibrations throughout the structural elements; the consideration of SSI is extremely important for controlling the performance of structures when subjected to these events
Settlement reduction for PA20 in stage 4 may be related to some reading error during monitoring; it was decided to proceed the analysis with this value
Summary
Reinforced concrete structure projects are elaborated usually considering three distinct parts: the superstructure, composed of slabs, beams, and columns; the infrastructure, consisting of the foundation elements (shallow or deep), and soil or rock mass, which support the requests coming from superstructure. Santos & Corrêa (2018) assessed load redistribution caused by SSI among foundations elements in a building with concrete walls by means of iterative numerical analyses, and observed a tendency of load transfer to supports under greater settlements to supports with lower settlements, and a uniformity of settlements among columns Other analyses, such as the dynamic effects of vibrations and seismicity combined with soil-structure interaction in buildings (Papadopoulos et al, 2017; Amini et al, 2018; Gómez-Martínez et al, 2020) point to the idea that the SSI mechanisms play a considerable role on behavior of buildings, directly influencing the propagation of vibrations throughout the structural elements; the consideration of SSI is extremely important for controlling the performance of structures when subjected to these events. All footings were designed for allowable pressure of 1040 kPa for the case where it considers the combination of permanent loads and wind action
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