Inst. Bauingenieurwesen

112 Items

Recent Submissions
An ALE method for penetration into sand utilizing optimization-based mesh motion

Aubram, Daniel ; Rackwitz, Frank ; Wriggers, Peter ; Savidis, Stavros A. (2015)

The numerical simulation of penetration into sand is one of the most challenging problems in computational geomechanics. The paper presents an arbitrary Lagrangian–Eulerian (ALE) finite element method for plane and axisymmetric quasi-static penetration into sand which overcomes the problems associated with the classical approaches. An operator-split is applied which breaks up solution of the go...

A comparison of different seismological and geotechnical parameters for site characterization

Boxberger, Tobias (2018)

The geometry of the subsoil structure, the soil types involved and the variation in their properties with depth, lateral discontinuities and surface topography are causes of lateral variation in earthquake-induced ground motion, over relatively small scales, referred to as "site effects" The modification of ground motion can manifest itself through amplification at particular frequencies (the ...

Homogeneous equilibrium model for geomechanical multi-material flow with compressible constituents

Aubram, Daniel (2016-04-09)

Multi-material flow generally describes a situation where several distinct materials separated by sharp material interfaces undergo large deformations. In order to model such flow situations in the context of geomechanics and geotechnical engineering, a theoretical framework is presented which introduces a possible two-phase coupled saturated granular material behavior among the different mater...

Nichtummantelte Sandsäulen in weichen Böden mit hohem organischen Anteil

Ney, Marcel (2018)

In der vorliegenden Arbeit wurden 20 klein- als auch großmaßstäbliche Modellversuche durchgeführt. Deren Ergebnisse wurden für einen Modifikationsansatz eines analytischen Bemessungsverfahrens genutzt. Es konnte nachgewiesen werden, dass unter Laborbedingungen kein Ausbauchen nichtummantelter Sandsäulen stattfindet. Es wurden wesentliche praxisrelevante Parameter variiert und deren Einflussauf ...

Urban flood modeling using shallow water equations with depth-dependent anisotropic porosity

Özgen, Ilhan ; Zhao, Jiaheng ; Liang, Dongfang ; Hinkelmann, Reinhard (2016-10)

The shallow water model with anisotropic porosity conceptually takes into account the unresolved subgrid-scale features, e.g. microtopography or buildings. This enables computationally efficient simulations that can be run on coarser grids, whereas reasonable accuracy is maintained via the introduction of porosity. This article presents a novel numerical model for the depth-averaged equations w...

Shallow water equations with depth-dependent anisotropic porosity for subgrid-scale topography

Özgen, Ilhan ; Liang, Dongfang ; Hinkelmann, Reinhard (2016-09)

This paper derives a novel formulation of the depth-averaged shallow water equations with anisotropic porosity for computational efficiency reasons. The aim is to run simulations on coarser grids while maintaining an acceptable accuracy through the introduction of porosity terms, which account for subgrid-scale effects. The porosity is divided into volumetric and areal porosities, which are ass...

Upscaling the shallow water model with a novel roughness formulation

Özgen, Ilhan ; Teuber, Katharina ; Simons, Franz ; Liang, Dongfang ; Hinkelmann, Reinhard (2015-08)

This study presents a novel roughness formulation to conceptually account for microtopography and compares it to four existing roughness models from literature. The aim is to increase the grid size for computational efficiency, while capturing subgrid scale effects with the roughness formulation to prevent the loss in accuracy associated with coarse grids. All roughness approaches are implement...

The influence of nanomaterials on the thermal resistance of cement-based composites – a review

Pawel, Sikora ; Abd Elrahman, Mohamed ; Stephan, Dietmar (2018-06-26)

Exposure to elevated temperatures has detrimental effects on the properties of cementitious composites, leading to irreversible changes, up to total failure. Various methods have been used to suppress the deterioration of concrete under elevated temperature conditions. Recently, nanomaterials have been introduced as admixtures, which decrease the thermal degradation of cement-based composites a...

Conceptual simplifications for long-term sediment transport simulations

Zhang, Qing (2018)

The aim of this PhD thesis is to assess the long-term evolution of the fine sediment budget in the Iffezheim reservoir, which is the last barrage of the impounded section of the Rhine River. Based on the observed flow and suspended sediment concentration as well as echo-sounding data, various methods were proposed to estimate long-term riverbed changes. The application of a high-resolution 3D m...

Multi-dimensional flow and transport modeling of a surface water body in a semi-arid area

Matta, Elena (2018)

Since approximately 2012, Northeast Brazil dramatically suffers from the harshest drought in the recent history, with serious consequences on water resources, anthropogenic uses and ecosystem services. Among else, the hydropower production, irrigation agriculture, water supply and net cage aquaculture are the principal uses adopted in the Itaparica Reservoir, located in the Sub-Middle São Franc...

Studying soil-structure interaction effects

Petrovic, Bojana (2018)

Since earthquakes can neither be prevented nor predicted, in order to reduce damage to the built environment and human losses, the fundamental goal is to improve the design of buildings. For this purpose, variations in ground motion over short distances during earthquakes arising from both site effects (modifications of the ground motions due to changes in the shallow geological layers) and soi...

Model-based design for restoration of a small urban river

Lange, Carsten ; Schneider, Matthias ; Mutz, Schneider ; Haustein, Martin ; Halle, Martin ; Seidel, Michael ; Sieker, Heiko ; Wolter, Christian ; Hinkelmann, Reinhard (2015)

A model-based design is presented for restoring the small urban river Panke located in Berlin, Germany. This new design process combines high resolution 2D hydraulic modeling with habitat modeling and river-ecological expert knowledge in a highly iterative way. Advances have been made for the habitat modeling: habitat suitability maps have been developed for fish and the habitat suitability for...

An efficient unstructured MUSCL scheme for solving the 2D shallow water equations

Hou, Jingming ; Liang, Qiuhua ; Zhang, Hongbin ; Hinkelmann, Reinhard (2015)

The aim of this paper is to present a novel monotone upstream scheme for conservation law (MUSCL) on unstructured grids. The novel edge-based MUSCL scheme is devised to construct the required values at the midpoint of cell edges in a more straightforward and effective way compared to other conventional approaches, by making better use of the geometrical property of the triangular grids. The sch...

Evaluation of the effects of crushed and expanded waste glass aggregates on the material properties of lightweight concrete using image-based approaches

Chung, Sang-Yeop ; Abd Elrahman, Mohamed ; Sikora, Pawel ; Rucinska, Teresa ; Horszczaruk, Elzbieta ; Stephan, Dietmar (2017-11-25)

Recently, the recycling of waste glass has become a worldwide issue in the reduction of waste and energy consumption. Waste glass can be utilized in construction materials, and understanding its effects on material properties is crucial in developing advanced materials. In this study, recycled crushed and expanded glasses are used as lightweight aggregates for concrete, and their relation to th...

Influence of Poroelasticity on the 3D Seismic Response of Complex Geological Media

Wuttke, Frank ; Dineva, Petia ; Fontara, Ioanna-Kleoniki (2017)

Elastic wave propagation in 3D poroelastic geological media with localized heterogeneities, such as an elastic inclusion and a canyon is investigated to visualize the modification of local site responses under consideration of water saturated geomaterial. The extended computational environment herein developed is a direct Boundary Integral Equation Method (BIEM), based on the frequency-dependen...

Leaching of inorganic and organic substances from construction materials and their ecotoxicological impact

Märkl, Veronika (2018)

In the last few years a growing environmental awareness in the field of construction materials can be observed. This has been, and continues to be, exacerbated since the Construction Products Regulations entered into force in 2013. In general construction products are in direct contact with the surrounding environment such as groundwater and soil. Especially grouting materials that often contai...

Cross-border risk assessment of earthquake-induced landslides in Central Asia

Saponaro, Annamaria (2018)

Central Asia is one of the most challenging places in the world where various natural hazards can heavily injury populations and resources. Among these hazards, landslides pose a serious threat to human life and human facilities. The large variability of local geological materials, together with the difficulties in forecasting heavy precipitation locally and in quantifying the level of ground s...

Alkalisch aktivierte Systeme auf Basis von Hüttensandmehlen

Tänzer, Ricarda (2018)

Alternative Bindemittel besitzen ökonomische und ökologische Vorteile sowie eine Vielzahl an positiven Eigenschaften (hoher Widerstand gegen aggressive Medien, hohe Druckfestigkeit, hoher Frostwiderstand, geringe beziehungsweise schnelle Abgabe von Reaktionswärme, geringe Porosität oder hohe Temperaturbeständigkeit). Die Eigenschaften hängen aber maßgeblich von der Art des Bindemitteltyps ab. F...

Phosphorus recovery from wastewater and sludge

Zhou, Kuangxin (2017)

Phosphor ist eine essentielle, aber begrenzte Ressource. Technologien zur Phosphorrückgewinnung wurden in den vergangenen Jahren weiter entwickelt und zum Teil großtechnisch umgesetzt, wodurch kommunales Abwasser und Klärschlamm als eine vielversprechende sekundäre Phosphorquelle angesehen werden kann. Deutschland ist bei Phosphor nahezu vollständig vom Import abhängig. Die neue, 2017 beschloss...

Three-dimensional modeling of wind- and temperature-induced flows in the Icó-Mandantes Bay, Itaparica Reservoir, NE Brazil

Matta, Elena ; Selge, Florian ; Gunkel, Günter ; Hinkelmann, Reinhard (2017)

The Icó-Mandantes Bay is one of the major branches of the Itaparica Reservoir (Sub-Middle São Francisco River, Northeast Brazil) and is the focus of this study. Besides the harmful algae blooms (HAB) and a severe prolonged drought, the bay has a strategic importance—e.g., the eastern channel of the newly built water diversion will withdraw water from it (drinking water). This article presents t...