Numerical Investigations on District Heating Pipelines under Combined Axial and Lateral Loading

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dc.identifier.uri Gerlach, Tim Achmus, Martin Terceros, Mauricio 2018-11-01T09:00:45Z 2018-11-01T09:00:45Z 2018
dc.identifier.citation Gerlach, T.; Achmus, M.; Terceros, M.: Numerical Investigations on District Heating Pipelines under Combined Axial and Lateral Loading. In: Energy Procedia 149 (2018), S. 435-444. DOI:
dc.description.abstract Within the design process of district heating networks, the soil resistances in axial and lateral pipeline direction are commonly treated independently as friction resistance and bedding pressure. However, at curved segments or near ellbows, these resistances occur simultaneously and affect each other. The state of knowledge regarding this topic is summarized, and it is shown that only limited information exists for this case of loading. Therefore, a three-dimensional finite element model was developed, using the sophisticated concept of hypoplasticity as an advanced constitutive model for the bedding material. This soil model is able to account for dilatancy, barotropy and pycnotropy of granular soils. Subsequently, variations of the loading direction were performed for a reference system. The investigations give a good insight into the behaviour of district heating pipelines under combined loading, showing the interdependency of skin friction resistance and bedding pressure. We present a design approach which incorporates interaction terms, derived from the presented investigations. Results gained from these investigation are then transferred to the academic district heating network design tool IGtH-Heat, to evaluate in which manner the incorporation of coupling terms between bedding and friction resistance influences the pipe-soil interaction. Additionally, a temperature dependent formulation of maximum friction resistance is adopted to incorporate the effects of radial pipe displacement. Thereby we demonstrate that the predicted pipeline's displacement significantly change when these effects are taken into account. Using this new formulation, model predictions are compared to data from full scale field measurements. eng
dc.language.iso eng
dc.publisher London : Elsevier Ltd.
dc.relation.ispartofseries Energy Procedia 149 (2018)
dc.rights CC BY-NC-ND 4.0
dc.subject buried pipelines eng
dc.subject combined loading eng
dc.subject numerical modelling eng
dc.subject Soil-structure interaction eng
dc.subject District heating eng
dc.subject Friction eng
dc.subject Heat resistance eng
dc.subject Heating equipment eng
dc.subject Numerical models eng
dc.subject Oil well drilling equipment eng
dc.subject Pipelines eng
dc.subject Soil structure interactions eng
dc.subject Soils eng
dc.subject Buried pipelines eng
dc.subject Combined loading eng
dc.subject District heating networks eng
dc.subject Numerical investigations eng
dc.subject Pipe-soil interaction eng
dc.subject Skin friction resistance eng
dc.subject Temperature dependent eng
dc.subject Three dimensional finite element model eng
dc.subject Loading eng
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title Numerical Investigations on District Heating Pipelines under Combined Axial and Lateral Loading
dc.type article
dc.type Text
dc.relation.issn 1876-6102
dc.bibliographicCitation.volume 149
dc.bibliographicCitation.firstPage 435
dc.bibliographicCitation.lastPage 444
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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