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Papers by Alexander Stolz
International Multi-Conference on Systems, Sygnals & Devices, 2012
ABSTRACT The presented work aims at development of a management evaluation system (condition moni... more ABSTRACT The presented work aims at development of a management evaluation system (condition monitoring) in the event of an explosion using a network of wireless sensors. The flow of information in the situation assessment system is made possible with the applied energy autonomous and energy-efficient wireless sensor nodes. Through this evaluation system, we will be able to do a real time assessment on the state of the damaged infrastructure through which we will be able to react to the situation in the area in a timely manner. We will show a new wireless sensor network topology and develop new rules for self-synchronization for energy efficient and collision free communication which is capable of data transmission in the event of an emergency situation.
Communications in Computer and Information Science, 2012
Beton- und Stahlbetonbau, 2013
ABSTRACT Within the design of reinforced concrete against explosive threats only a subjective or ... more ABSTRACT Within the design of reinforced concrete against explosive threats only a subjective or a lump safety is currently considered. Therefore the established safety is unknown. For the estimation of the existing safety of present approaches the SDOF approach has been linked to the first order reliability method, which allows for a derivation of the given reliability. Hereby it could be proven that the considered safety is, compared to the claimed reliability of the Eurocode (EC0), deficient.
Critical transport infrastructure, such as tunnels and bridges, is designed to withstand a broad ... more Critical transport infrastructure, such as tunnels and bridges, is designed to withstand a broad range of loading conditions. However, critical load-bearing members of these structures are typically visibly exposed or accessible, making them more vulnerable to terrorist attacks. Such structures therefore require special consideration and protection. Being able to predict the effects of explosions on structural integrity can aid both in determining conditions for safe usage and in developing proper protective countermeasures. Devising and applying techniques for quantitatively assessing residual load-bearing capacity of such structures when damage has occurred and what degree of damage constitutes critical damage is very important and is the focus of the described study. In order to evaluate the criticality of different possible detonation scenarios, several components of physical structures are analyzed using various state-of-the-art methods. Reinforced concrete components under bot...
1. EINFÜHRUNG Zur Beurteilung der Kritikalität eines Bauwerkes oder seiner Teile sind mehrere Ana... more 1. EINFÜHRUNG Zur Beurteilung der Kritikalität eines Bauwerkes oder seiner Teile sind mehrere Analyseschritte zu durchlaufen, die in einer Bewertung des betrachteten Objektes mündet. Abbildung 1: Analyseschema zur Beurteilung der Kritikalität der Elemente der Infrastruktur Der Ablauf der Analyse ist in Abbildung 1 als Schaubild visualisiert. Der erste Schritt innerhalb der Analyse beinhaltet die Identifikation einer maßgebenden und relevanten Bedrohung sowie die aus der Bedrohung resultierenden Risiken für die betrachteten Bauwerke. Wichtiger Bestandteil der daran anschließenden Risikoanalyse ist dabei die Prognose des zu erwartenden Schadensausmaßes am betrachteten Bauwerk oder seiner Teile infolge des definierten Bedrohungsszenarios. Durch diese ereignisbezogenen Schadensanalyse können dann für die Bauwerke bestehende Risiken im Sinne seines Tragfähigkeitsverlustes bzw. der Resttragfähigkeit bewertet und bei Bedarf entsprechende Schutzmaßnahmen entwickelt werden. Die Identifikatio...
Buildings of critical transport infrastructure, such as tunnels and bridges, often reside on spec... more Buildings of critical transport infrastructure, such as tunnels and bridges, often reside on special load-bearing members and conditions. The vulnerability concerning terroristic threats and the criticality for such buildings are the focus of the described study. In order to evaluate the criticality of different possible detonation scenarios, several components of infrastructural buildings are analyzed using different state-of-the-art methods. Reinforced concrete components under contact and close-in detonation loading are examined using validated engineering tools. The presented evaluation processes enable thereby the definition of criticality of different loading scenarios in relation to different reinforced concrete components. Global failure mechanisms are investigated by a combination of partly newly developed engineering tools, which facilitate a confirmed appraisal for internal detonation scenarios too. For the bridge cables a stepwise analysis procedure including mesomechani...
Journal of Structural Engineering, 2014
International Journal of Protective Structures, 2010
ABSTRACT Flugzeuganprall wird als außergewöhnliche Einwirkung für stark exponierte kritische Infr... more ABSTRACT Flugzeuganprall wird als außergewöhnliche Einwirkung für stark exponierte kritische Infrastrukturen wie Kernkraftwerke oder sehr große Hochhäuser in Betracht gezogen. Der Beitrag stellt die Entwicklung und Validierung neuer Bauwerkskonzepte auf Basis von Hochleistungsbetonen (HPC, UHPC) vor. Als Beispiele dienen ein Hochhaus [1, 2] und ein externes Schutzbauwerk für bestehende Kernkraftwerke [3, 4], bei denen jeweils der Einsatz von Hochleistungsbetonen die Entwicklung innovativer Tragwerke ermöglicht. Die Methoden des Zwei‐Massen‐Schwingers (ZMS) und Finite‐Elemente‐Methoden in der Struktur‐ und Kurzzeitdynamik werden zusammen mit publizierten und eigenen Validierungsexperimenten [5, 6] benützt, um die Grenzdicke (ultra‐)hochfester, faserbewehrter Stahlbetonbauteile zu ermitteln und somit zentrale Sicherheitszonen der Gebäude vor Brand und Trümmerflug zu schützen.
International Journal of Impact Engineering, 2014
ABSTRACT For chosen infrastructural buildings, the occurrence of an intentional or accidental bla... more ABSTRACT For chosen infrastructural buildings, the occurrence of an intentional or accidental blast loading has to be considered. These infrastructures building components have to withstand the loading in order to avoid fatal debris ejection and to ensure the integrity and stability of the construction under such extraordinary loading situations. To ensure a sufficient resistance in a slender construction, advanced concrete based materials are known to have high protection potential (i.e. Roller 2010). This paper investigates systematically the bearing resistance of plate elements made of the ductile concrete DUCON® under blast loading conditions. Therefore, a series of shock tube tests has been conducted to investigate different configurations of ductile concrete plates with varying thickness and degree of reinforcement. Based on the results, a mathematical description of the resistance behavior of ductile concrete has been derived. Iso-damage curves are calculated using the derived resistance function in a Single-Degree-of-Freedom model. Applying similarity analysis for non-dimensionalized formulation enables the transfer of the experimental results to arbitrary (similar) plate dimensions. Results and findings of the paper are finally compared and discussed in relation to normal strength reinforced concrete.
International Multi-Conference on Systems, Sygnals & Devices, 2012
ABSTRACT The presented work aims at development of a management evaluation system (condition moni... more ABSTRACT The presented work aims at development of a management evaluation system (condition monitoring) in the event of an explosion using a network of wireless sensors. The flow of information in the situation assessment system is made possible with the applied energy autonomous and energy-efficient wireless sensor nodes. Through this evaluation system, we will be able to do a real time assessment on the state of the damaged infrastructure through which we will be able to react to the situation in the area in a timely manner. We will show a new wireless sensor network topology and develop new rules for self-synchronization for energy efficient and collision free communication which is capable of data transmission in the event of an emergency situation.
Communications in Computer and Information Science, 2012
Beton- und Stahlbetonbau, 2013
ABSTRACT Within the design of reinforced concrete against explosive threats only a subjective or ... more ABSTRACT Within the design of reinforced concrete against explosive threats only a subjective or a lump safety is currently considered. Therefore the established safety is unknown. For the estimation of the existing safety of present approaches the SDOF approach has been linked to the first order reliability method, which allows for a derivation of the given reliability. Hereby it could be proven that the considered safety is, compared to the claimed reliability of the Eurocode (EC0), deficient.
Critical transport infrastructure, such as tunnels and bridges, is designed to withstand a broad ... more Critical transport infrastructure, such as tunnels and bridges, is designed to withstand a broad range of loading conditions. However, critical load-bearing members of these structures are typically visibly exposed or accessible, making them more vulnerable to terrorist attacks. Such structures therefore require special consideration and protection. Being able to predict the effects of explosions on structural integrity can aid both in determining conditions for safe usage and in developing proper protective countermeasures. Devising and applying techniques for quantitatively assessing residual load-bearing capacity of such structures when damage has occurred and what degree of damage constitutes critical damage is very important and is the focus of the described study. In order to evaluate the criticality of different possible detonation scenarios, several components of physical structures are analyzed using various state-of-the-art methods. Reinforced concrete components under bot...
1. EINFÜHRUNG Zur Beurteilung der Kritikalität eines Bauwerkes oder seiner Teile sind mehrere Ana... more 1. EINFÜHRUNG Zur Beurteilung der Kritikalität eines Bauwerkes oder seiner Teile sind mehrere Analyseschritte zu durchlaufen, die in einer Bewertung des betrachteten Objektes mündet. Abbildung 1: Analyseschema zur Beurteilung der Kritikalität der Elemente der Infrastruktur Der Ablauf der Analyse ist in Abbildung 1 als Schaubild visualisiert. Der erste Schritt innerhalb der Analyse beinhaltet die Identifikation einer maßgebenden und relevanten Bedrohung sowie die aus der Bedrohung resultierenden Risiken für die betrachteten Bauwerke. Wichtiger Bestandteil der daran anschließenden Risikoanalyse ist dabei die Prognose des zu erwartenden Schadensausmaßes am betrachteten Bauwerk oder seiner Teile infolge des definierten Bedrohungsszenarios. Durch diese ereignisbezogenen Schadensanalyse können dann für die Bauwerke bestehende Risiken im Sinne seines Tragfähigkeitsverlustes bzw. der Resttragfähigkeit bewertet und bei Bedarf entsprechende Schutzmaßnahmen entwickelt werden. Die Identifikatio...
Buildings of critical transport infrastructure, such as tunnels and bridges, often reside on spec... more Buildings of critical transport infrastructure, such as tunnels and bridges, often reside on special load-bearing members and conditions. The vulnerability concerning terroristic threats and the criticality for such buildings are the focus of the described study. In order to evaluate the criticality of different possible detonation scenarios, several components of infrastructural buildings are analyzed using different state-of-the-art methods. Reinforced concrete components under contact and close-in detonation loading are examined using validated engineering tools. The presented evaluation processes enable thereby the definition of criticality of different loading scenarios in relation to different reinforced concrete components. Global failure mechanisms are investigated by a combination of partly newly developed engineering tools, which facilitate a confirmed appraisal for internal detonation scenarios too. For the bridge cables a stepwise analysis procedure including mesomechani...
Journal of Structural Engineering, 2014
International Journal of Protective Structures, 2010
ABSTRACT Flugzeuganprall wird als außergewöhnliche Einwirkung für stark exponierte kritische Infr... more ABSTRACT Flugzeuganprall wird als außergewöhnliche Einwirkung für stark exponierte kritische Infrastrukturen wie Kernkraftwerke oder sehr große Hochhäuser in Betracht gezogen. Der Beitrag stellt die Entwicklung und Validierung neuer Bauwerkskonzepte auf Basis von Hochleistungsbetonen (HPC, UHPC) vor. Als Beispiele dienen ein Hochhaus [1, 2] und ein externes Schutzbauwerk für bestehende Kernkraftwerke [3, 4], bei denen jeweils der Einsatz von Hochleistungsbetonen die Entwicklung innovativer Tragwerke ermöglicht. Die Methoden des Zwei‐Massen‐Schwingers (ZMS) und Finite‐Elemente‐Methoden in der Struktur‐ und Kurzzeitdynamik werden zusammen mit publizierten und eigenen Validierungsexperimenten [5, 6] benützt, um die Grenzdicke (ultra‐)hochfester, faserbewehrter Stahlbetonbauteile zu ermitteln und somit zentrale Sicherheitszonen der Gebäude vor Brand und Trümmerflug zu schützen.
International Journal of Impact Engineering, 2014
ABSTRACT For chosen infrastructural buildings, the occurrence of an intentional or accidental bla... more ABSTRACT For chosen infrastructural buildings, the occurrence of an intentional or accidental blast loading has to be considered. These infrastructures building components have to withstand the loading in order to avoid fatal debris ejection and to ensure the integrity and stability of the construction under such extraordinary loading situations. To ensure a sufficient resistance in a slender construction, advanced concrete based materials are known to have high protection potential (i.e. Roller 2010). This paper investigates systematically the bearing resistance of plate elements made of the ductile concrete DUCON® under blast loading conditions. Therefore, a series of shock tube tests has been conducted to investigate different configurations of ductile concrete plates with varying thickness and degree of reinforcement. Based on the results, a mathematical description of the resistance behavior of ductile concrete has been derived. Iso-damage curves are calculated using the derived resistance function in a Single-Degree-of-Freedom model. Applying similarity analysis for non-dimensionalized formulation enables the transfer of the experimental results to arbitrary (similar) plate dimensions. Results and findings of the paper are finally compared and discussed in relation to normal strength reinforced concrete.