http://repositorio.ufc.br/handle/riufc/419 2026-06-14T05:26:30Z 2026-06-14T05:26:30Z Lima, Diana Rodrigues de Moura, Alfran Sampaio http://repositorio.ufc.br/handle/riufc/86745 2026-06-12T20:39:20Z 2016-01-01T00:00:00Z

Título: Controle executivo de estacas raiz a partir de medidas de campo Autor(es): Lima, Diana Rodrigues de; Moura, Alfran Sampaio Abstract: During the execution of the foundations of buildings, the evaluation of the failure load is commonly determined by specific methods, which vary depending on the type of pile. The control of root piles are usually executed by load tests. This paper proposes an empirical formulation for prediction of failure load of root piles, using some variables that are monitored during the execution of the piles, using a digital speedometer. Therefore, slow static load test in three root piles monitored with diameters of 350 to 410 mm were conducted. Several combinations between portions of end bearing load capacity, side friction load capacity, and the monitored variables, were tested using computer programs as Excel and Maple. Afterwards, an equation for the prediction of the failure load of the piles tested was estimated, as a function of the monitored variables, according to polynomial relations, exponential, logarithmic and linear combination, referencing to the value obtained in Van der Veen’s method (1953). It was found that there is a correlation between the failure load and the monitored variables, and the results obtained by the proposed equation were concordant with the reference values for the tested piles. Tipo: Artigo de Periódico

2016-01-01T00:00:00Z Dantas Neto, Silvrano Adonias Silveira, Mariana Vela Anjos, Gerson Jacques Miranda dos Moura, Alfran Sampaio http://repositorio.ufc.br/handle/riufc/86744 2026-06-12T20:33:21Z 2016-01-01T00:00:00Z

Título: Modelo de previsão de recalques em estacas hélice contínua, metálicas e escavadas através de redes neurais artificiais Autor(es): Dantas Neto, Silvrano Adonias; Silveira, Mariana Vela; Anjos, Gerson Jacques Miranda dos; Moura, Alfran Sampaio Abstract: This work presents a method for pile settlement prediction using an artificial neural network(ANN) known as perceptron. Results from 199 SPT and static load tests carried out on continuous flight auger,steel and bored piles were used in the model development. The ANN model allows the prediction ofsettlements as a function of the pile type and geometry (diameter and length), the stratigraphy andcharacteristics of soils defined by SPT test results, and the applied load. The architecture that presented thebest performance was A10:14:8:4:2:1, with a correlation coefficient of 0.94. The results were compared tothose obtained in previous works and by other authors that also developed settlement prediction models usingANNs. This comparison has shown that the proposed model is able to predict settlements more accurately Tipo: Artigo de Periódico

2016-01-01T00:00:00Z Moura, Alfran Sampaio Silva Filho, Francisco Chagas da Dantas Neto, Silvrano Adonias http://repositorio.ufc.br/handle/riufc/86743 2026-06-12T20:23:04Z 2017-01-01T00:00:00Z

Título: Previsão de curvas de retenção por correlações com propriedades dos solos Autor(es): Moura, Alfran Sampaio; Silva Filho, Francisco Chagas da; Dantas Neto, Silvrano Adonias Abstract: This paperpresents, at first, an abbreviation revision concerning basic concepts about the suction and the capacity of retention of soils unsaturated. Adatabase of 50 characteristic curves was set up, whose curves were adjusted for 6models proposed in the literature.Parameters ofadjustment of the models were determined bythe reduction of erroramong the experimental curves in aniterative way. Subsequently, correlations were accomplished between the parameters of adjustment of the models and some propertiesof the soils. Finally, there were undertaken comparisons among the experimental characteristic curves of some soils and the corresponding estimated curvesfrom the adjusted models. The models of Willians et al.(1983), Brooks and Corey (1964), Fredlund and Xing (1994) and Gardner (1958)provided the most consistentadjustments. Tipo: Artigo de Periódico

2017-01-01T00:00:00Z Almeida, Marcela Moreira da Rocha Silva Filho, Francisco Chagas da Lopes, Elis Ferreira Moura, Alfran Sampaio http://repositorio.ufc.br/handle/riufc/86742 2026-06-12T20:20:23Z 2020-01-01T00:00:00Z

Título: Avaliação de métodos de estimativa da capacidade de carga de fundações diretas em solos não saturados Autor(es): Almeida, Marcela Moreira da Rocha; Silva Filho, Francisco Chagas da; Lopes, Elis Ferreira; Moura, Alfran Sampaio Abstract: This paper presents an experimental and numerical analysis of the behavior of an unsaturated soil with respect to the bearing capacity of shallow foundations. For this, the results of two plate load tests on a 30 cm diameter plate in the Experimental Field of Foundations of the Federal University of Ceará, with soil in two different conditions, one with a natural moisture profile and the other with pre-flood are presented. Soil samples were collected in each of the trials, and the soil was later characterized. The soil suction in both situations were estimated through the soil-water characteristic curve. Several soil suction profiles are presented in accordance with the methodology proposed by Lu and Likos (2004), followed by the proposals of Oloo et al. (1997), Vanapalli and Mohamed (2007), Briaud (2013), Vahedifard and Robinson (2016) and Tang et al. (2017) for the determination of bearing capacity of shallow foundations in unsaturated soils. The values obtained in the application of these methods showed values of bearing capacity quite coherent with the values determined by the extrapolation of the curve from the unsaturated plate load test. Tipo: Artigo de Periódico

2020-01-01T00:00:00Z