Jasmin Buco

Bio: Jasmin Buco is an academic researcher from Institut national des sciences Appliquées de Lyon. The author has contributed to research in topics: Stiffness. The author has an hindex of 2, co-authored 2 publications receiving 34 citations.

Full-Scale Experimental Determination of Concrete Pipe Joint Behavior and Its Modeling

Abstract: As a consequence of unequal loading or variable soil conditions, longitudinal bending of buried gravity pipes leads to circumferential pipe cracking or joint opening, which results in groundwater infiltration or leakage. Since joints considerably affect longitudinal pipe behavior, an advanced investigation of this aspect requires knowledge of the joint mechanical properties and particularly of its stiffness. An experimental apparatus has been developed in order to determine the joint behavior under various loading conditions. Results of compression, shear, and bending tests are given in terms of force-displacement plots. A simple rheological bilinear model of the joint is elaborated from compression and shear tests and then validated on the experimental bending results. In general a good agreement is found between model and experimental output. This simple model will be implemented in numerical simulations of buried pipe behavior.

Analyse et modélisation du comportement mécanique des conduites enterrées

Abstract: As a consequence of their aging, the performance of buried pipes has become a major concern for the urban sewer systems managers. Improvement of both the pipe design and its installation conditions or a more efficient management requires first a comprehension of phenomena that lead to pipe deterioration. This research starts a new long-term and multidisciplinary topic where the study of the structural pipe degradation in relation with soil condition represents only one part of the whole extent. Within this context, our approach consists in first identifying such phenomena, then describing their effects on sewers. This PhD thesis is composed of three different parts. In the first part, a statistical analysis of failures affecting the Greater Lyon sewer network and the factors that are likely to make them appear is achieved in order to determine in what circumstances these failures occur. It is then possible to identify some of the mechanical processes that may generate the pipe deficiencies. It appears that the phenomena identified as having a major influence on the pipe behaviour are completely ignored by the current design standards. The second part is dedicated to the experimental characterization, via laboratory tests, of the mechanical behaviour of the most unknown part of the sewer pipe: the joint. A rheological model of its behaviour under three types of loading is developed so that it can be easily adapted to all kinds of joint with rubber gaskets. The last part regards a numerical 3D modelling of a trench and a pipe which includes all the major parameters having a significant influence on the pipe behaviour. A numerical representation of the joint is based on the lab test results, while the rest of the model is validated with the results from the literature. This numerical modelling is then used to investigate the influence of the soil variability within the trench, particularly focusing on the longitudinal pipe behaviour.

Numerical parametric study of tunneling-induced joint rotation angle in jointed pipelines

Abstract: Pipeline–tunnel interaction has attracted increasing research attention recently. Previous studies focused mainly on tunneling-induced deformation in continuous pipelines. In this paper, an extensi...

Centrifuge testing to simulate buried reinforced concrete pipe joints subjected to traffic loading

Abstract: Pipeline water leakage has become a serious problem in many countries. It has been widely noted that most of the damage to the pipelines occurs in the joints where two pipes are connected to each o...