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Koentges, Saralina (author)This work aims to achieve a softening moment-angle response by utilizing compliant parts. The approach uses the principle of contact release, which involves initially prestressed torsional bars arranged in series, separated by rigid bodies. By stepwise activation of the torsional bars, a softening behavior is achieved. Mechanical stops are...master thesis 2023
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Bui, Tuan Anh (author), Cammarata, Giuseppe (author), Choudary Kancharla, Varun (author), Brinkgreve, R.B.J. (author), Brasile, Sandro (author)Rock bolting plays an important role in different geo-engineering applications and its numerical modelling is crucial for the analysis and design of rock structures. Continuum modelling simulation of bolt-reinforced rock masses requires specific techniques to properly model the reinforcement system and its interaction with the rock mass, which...conference paper 2023
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Wang, Heng (author), Chen, Feng (author), Shiau, Jim (author), Dias, Daniel (author), Lai, F. (author), Huang, Jianhua (author)Cement-based columns in combination with geosynthetic reinforcement is a well-established soft ground improvement technique to enhance embankment stability. This paper aims to present a finite-element (FE) study based on a case history of a geosynthetic-reinforced column-supported (GRCS) embankment over soft soil. In this study, the columns...journal article 2023
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Bresser, D. (author), Rots, J.G. (author), Hendriks, M.A.N. (author), Pari, M. (author)Sequentially Linear Analysis (SLA), an event-by-event solution strategy in which a sequence of scaled linear analyses with decreasing secant stiffness is performed, representing local damage increments; is a robust alternative to nonlinear finite element analysis of quasi-brittle structures. Since it is based on a fixed smeared crack...journal article 2023
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Alfaiate, J. (author), Sluys, Lambertus J. (author)In quasi-brittle materials, such as reinforced concrete, localisation of initially diffuse cracking evolving in localised cracking patterns consists of a numerically challenging task. With conventional iterative methods, convergence of the numerical solution scheme to model crack localisation is often difficult to obtain. On the other hand,...journal article 2023
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Oktiovan, Y.P. (author), Davis, L. (author), Wilson, R. (author), Dell'Endice, A. (author), Mehrotra, A.A. (author), Pulatsu, B. (author), Malomo, D. (author)The assessment of the seismic performance of unreinforced masonry cross-vaults is still a challenge in numerical analysis, due to complex curved geometries and bond patterns, and uncertainties related to the selection of adequate modeling strategies, including but not limited to that of material properties, damping scheme, and unit/joint...journal article 2023
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van Nes, Sjors (author)In this work, the possibilities to approach various nonlinear moment-angle characteristics with a kinematically indeterminate rigid body balancer with torsion springs are examined. These torsion springs are mounted on the axes that intersect the rigid bodies. The rigid body balancer is coupled to an inverted pendulum. Although the kinematic...master thesis 2022
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Gulamussen, N.J. (author), Donse, D. (author), Marques Arsenio, A. (author), Heijman, Sebastiaan (author), Rietveld, L.C. (author)There is a global need for optimizing the use of water that has resulted from increased demand due to industrial development, population growth, climate change and the pollution of natural water resources. One of the solutions is to use reclaimed water in industrial applications that do not require water of potable quality, such as cooling water...journal article 2022
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Kramer, O.J.I. (author)In drinking water treatment plants, multiphase flows are a frequent phenomenon. Examples of such flows are pellet-softening and filter backwashing where liquid-solid fluidisation is applied. A better grasp of these fluidisation processes is needed to be able to determine optimal hydraulic states. In this research, models were developed, and...doctoral thesis 2021
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de Lint, Tjebbe (author)Over the past decades the diamagnetic effect has been used for a variety of applications. This ranges from levitating a living frog to stabilizing a force sensor, designing an acceleration sensor and determining the power of a laser. Diamagnetic levitation is the only method in which a passive stable levitation of an object can be achieved....master thesis 2021
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Beeftink, Mart (author), Hofs, Bas (author), Kramer, O.J.I. (author), Odegard, Ingrid (author), van der Wal, Albert (author)In the Netherlands, central softening of drinking water is widely applied for reasons of public health, client comfort, economic and environmental benefits. Currently, the detrimental contributions of softening, in particular the use of chemicals and energy, are taken into account in the carbon footprint of the Dutch drinking water companies....journal article 2021
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Kramer, O.J.I. (author), van Schaik, C. (author), Hangelbroek, J.J. (author), de Moel, P.J. (author), Colin, M.G. (author), Amsing, M. (author), Boek, E.S. (author), Breugem, W.P. (author), Padding, J.T. (author), van der Hoek, J.P. (author)Liquid-solid fluidisation is frequently encountered in drinking water treatment processes, often to obtain a large liquid-solid interfacial surface area. A large surface area is crucial for optimal seeded crystallisation in full-scale softening reactors. Due to crystallisation, particles grow and migrate to a lower zone in the reactor which...journal article 2021
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Xu, P. (author), Wellens, P.R. (author)Maritime structures in water always experience a mean hydrostatic pressure. This paper investigates the nonlinear vibration of a clamped circular thin plate subjected to a non-zero mean load. A set of coupled Helmholtz–Duffing equations is obtained by decomposing the static and dynamic deflections and employing a Galerkin procedure. The...journal article 2021
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Wei, L. (author), Li, Z. (author), Ye, G. (author), Rietveld, L.C. (author), van Halem, D. (author)Excessive F<sup>-</sup> in drinking water due to natural and anthropogenic activities is a serious health hazard affecting humans worldwide. In this study, a comparative assessment was made of eight mineral-based materials with advantageous structural properties for F<sup>-</sup> uptake: layered-double-hydroxides (LDHs), geopolymers,...journal article 2021
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Chauhan, Devi Singh (author)Aim of the blast furnace ironmaking process is the extraction of iron from iron ore, and prepare the raw iron (hot metal) for steel making. The iron oxides (ore) are charged into the furnace in the form of sinters and pellets containing the iron ore. Iron ore interacts with reducing gases and coke to form molten iron which in combination with...master thesis 2020
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Gavel, D.J. (author)The principal objective of this work is to understand the physicochemical behaviour of the ferrous raw material (pellet and/or sinter) bed mixed with nut coke under the blast furnace conditions. To investigate this behaviour, a specially designed blast furnace simulator called the Reduction Softening and Melting (RSM) apparatus is utilised ...doctoral thesis 2020
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Jafari, S. (author), Rots, J.G. (author), Esposito, R. (author)In this study, tests on cores and companion tests on triplets are compared with respect to the evaluation of the nonlinear shear-sliding behaviour of masonry, including the determination of post-peak softening response. Due to its slightly-destructive sampling nature and its good agreement with triplet results, the core testing method is...journal article 2020
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Kramer, O.J.I. (author), de Moel, P.J. (author), Padding, J.T. (author), Baars, E.T. (author), El Hasadi, Yousef M.F. (author), Boek, E.S. (author), van der Hoek, J.P. (author)In full-scale drinking water production plants in the Netherlands, central softening is widely used for reasons related to public health, client comfort, and economic and environmental benefits. Almost 500 million cubic meters of water is softened annually through seeded crystallisation in fluidised bed reactors. The societal call for a circular...journal article 2020
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Micari, M. (author), Diamantidou, D. (author), Heijman, Sebastiaan (author), Moser, M. (author), Haidari, A.H. (author), Spanjers, H. (author), Bertsch, V. (author)This work presents a joint experimental and simulation campaign aimed at characterizing two nanofiltration membranes (TS80 and NF270) in the presence of a multi-ionic water solution simulating the spent regenerant of cationic ion exchange resins employed for water softening. We identified the membrane parameters, which allowed for predicting...journal article 2020
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Gavel, D.J. (author), Adema, A.T. (author), van der Stel, Jan (author), Sietsma, J. (author), Boom, R. (author), Yang, Y. (author)Effect of nut coke addition with ferrous burden (pellet and sinter mixture) is experimentally investigated under simulated blast furnace conditions. Nut coke mixing degree was varied (0, 20 and 40 wt-%) as a replacement of the regular coke. During smelting, the ferrous bed evolves through three distinct stages of shrinkage due to indirect...journal article 2020