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ISOLATED FOOTING: These are elements designed to support the load of a single pillar. It is not mandatory to have the same bottom level in relation to the others in the project. It all depends a lot on the terrain and the structural project. Projects with isolated footings are more economical since they consume less materials. RUNNING FOOTING is a structural option for the foundation of continuous elements such as walls, for example. This one does have to be kept at the same level, but even so, it can still be uneven using the stepped system. However, be very careful with this type of footing. Since the loads are linear, the running footing is thin in relation to its length, which makes it not very rigid and deformations can appear along its length, such as fissures or even cracks in the walls. BOUNDARY FOOT, It is normally dimensioned with a balance beam, since the base of the footing does not coincide with the center of gravity of the pillar, this distance generates a moment that needs to be combated, the balance beam allows the transmission of the efforts resulting from eccentricity between the pillar and the footing to the rest of the structure. ASSOCIATED FOOT, It is normally applied in the presence of large loads in relation to the admissible tension of the soil, therefore this type of footing is dimensioned whenever there is a geometric impossibility of using an isolated footing per pillar. get to know the vida engenharia channel in this link • How to calculate the ideal size of the footing... watch the clip of the music at the end of the video in this link • Viver Pra Ser Só Teu - Tribos de Jacó