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Anistoroaiei, Christian; Heymel, Ulrich; Jung, Rolf; Sagner, Michael Erik Bridge across the Lochkov Valley, Prague Ring Road - a strutted frame construction of a special kind Steel Construction 2/2013 163-170 Reports

Kurzfassung

This bridge, which connects Slivenec with Lahovice, is the project that completes the highway bypass south of Prague, in the Lochkov Valley. The bridge structure is 425.3 m long, 35 m wide and reaches a maximum height of almost 65 m. From both the architectural and engineering points of view, the bridge is an unusual design, with a curved composite structure supported by inclined concrete piers in the central span.

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Announcement: Steel Construction 2/2013 Steel Construction 2/2013 170 Announcement

Kurzfassung

Keine Kurzfassung verfügbar.

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ECCS News: Steel Construction 2/2013 Steel Construction 2/2013 171-174 ECCS News

Kurzfassung

Conferences
Announcements
Technical Committees (TC) activities
TC News
ECCS News

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Puthli, Ram Professor Jacob Wardenier reaches 70 Steel Construction 2/2013 175 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Pirttijoki, Janne Pekka Ritakallio retired Steel Construction 2/2013 175-176 People

Kurzfassung

Keine Kurzfassung verfügbar.

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Contents: Structural Concrete 2/2013 Structural Concrete 2/2013 Contents

Kurzfassung

Keine Kurzfassung verfügbar.

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Curbach, Manfred Concrete light - possibilities and visions Structural Concrete 2/2013 87-88 Editorial

Kurzfassung

Keine Kurzfassung verfügbar.

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Corres-Peiretti, Hugo Sound engineering through conceptual design according to the fib Model Code 2010 Structural Concrete 2/2013 89-98 Technical Papers

Kurzfassung

Conceptual design is the approach that creates an idea in order to find a solution to a new proposal for a structure or solve a detail in a specific structure. It is a personal approach that is learned over time and with experience. It is not normally dealt with at university, but is vitally important for producing sound structures.
The fib Model Code for Concrete Structures 2010 introduced this concept in the first section of chapter 7 “Design”. The content of that section explains the general approach to developing conceptual design.
This paper will show different examples of conceptual design following the general guidelines stated in the Model Code.

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Balázs, György L.; Bisch, Philippe; Borosnyói, Adorján; Burdet, Olivier; Burns, Clare; Ceroni, Francesca; Cervenka, Vladimir; Chiorino, Mario A.; Debernardi, Piergiorgio; Eckfeldt, Lars; El-Badry, Mamdouh; Fehling, Ekkehard; Foster, Stephen J.; Ghali, Amin; Gribniak, Viktor; Guiglia, Matteo; Kaklauskas, Gintaris; Lark, Robert J.; Lenkei, Peter; Lorrain, Michel; Marí, Antonio; Ozbolt, Josko; Pecce, Marisa; Pérez Caldentey, Alejandro; Taliano, Maurizio; Tkalcic, Damir; Torrenti, Jean Michel; Torres, Lluis; Toutlemonde, François; Ueda, Tamon; Vitek, Jan L.; Vráblík, Luká Design for SLS according to fib Model Code 2010 Structural Concrete 2/2013 99-123 Technical Papers

Kurzfassung

This paper provides an overview of serviceability specifications given by the fib Model Code for Concrete Structures 2010 (fib MC2010 [1]). First, the reasons behind crack control and deflection control are discussed, then specific design rules are provided. Simple rules as well as detailed models are also presented. Numerical examples are provided in order to assist in the application of the design recommendations for crack control and deflection control (reinforced and prestressed concrete elements).
Simple rules mean indirect control of cracking or deflections without calculations. Indirect crack control may include limitation of stresses and selection of maximum bar diameter or maximum bar spacing. Indirect deflection control normally means limiting the span-to-depth ratio.
Detailed models are based on physical and mathematical approaches to cracking and deflections. The design crack width is expressed as the maximum bond transfer length multiplied by the mean strain between cracks. Deflection analysis can be provided by integrating curvatures or by using a simplified or refined method. Vibrations and numerical modelling of cracking are also briefly discussed.

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Tailhan, Jean-Louis; Boulay, Claude; Rossi, Pierre; Le Maou, Fabrice; Martin, Eric Compressive, tensile and bending basic creep behaviours related to the same concrete Structural Concrete 2/2013 124-130 Technical Papers

Kurzfassung

This paper concerns the relationship between compressive, tensile and flexural creep behaviours related to the same concrete. Experimental tests and a numerical simulation are performed in the scope of this work. The main conclusion of this study is that due to the strong scale effect related to the tensile and bending creep behaviours of a “standard” concrete mix design, it is not possible to simulate numerically (with classical Kelvin-Voigt chains) the bending creep behaviour of that type of concrete knowing the compressive and tensile creep behaviours obtained using the specimen geometries normally used in laboratories.

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Seo, Tae-Seok; Kim, Jung-Chul Behaviour of concrete in a stress continuity region after cracking under restrained drying shrinkage Structural Concrete 2/2013 131-137 Technical Papers

Kurzfassung

Some studies have investigated the time-dependent characteristic of concrete for predicting stress under restrained shrinkage. However, these studies investigated the shrinkage behaviour of concrete in restrained conditions before cracking, and no study has yet investigated the behaviour of concrete due to restrained shrinkage in the stress continuity region after cracking. Therefore, this study investigates the shrinkage behaviour of concrete in the stress continuity region after cracking in uniaxial restrained specimens and analyses the restrained tensile stress of concrete in this region by way of a bond analysis. The results show that the effective tensile Young's modulus considering tensile creep is approx. 22-26% of the static modulus of elasticity. Moreover, the analytical results of the restrained tensile stress of concrete considering the effective tensile Young's modulus were in accordance with the experimental results.

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Isaacs, Ben; Lark, Robert; Jefferson, Tony; Davies, Robert; Dunn, Simon Crack healing of cementitious materials using shrinkable polymer tendons Structural Concrete 2/2013 138-147 Technical Papers

Kurzfassung

This paper presents an experimental study on autogenous healing in a recently developed shrinkable polymer cementitious material system. Small-scale hollow prismatic mortar beams with unbonded shrinkable polymer tendons were loaded until a crack of predefined width had formed. The specimens were then subjected to a range of combined heating/curing regimes to activate the shrinkable polymer and to promote autogenous healing of the cementitious material prior to reloading to failure. Upon reloading, specimens loaded with the shrinkable polymer tendons remaining after heating and curing achieved between 120 and 195% of their initial peak loads, whereas specimens tested with the shrinkable polymer tendons removed after the heating and curing stages recovered on average 80% of their initial peak loads. The overall conclusion was that, provided a supply of water is present and sufficient heat is applied for polymer activation, the material system is effective at not only closing cracks and applying a prestress, but also at enhancing the self-healing of cracks in cementitious materials.

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Ng, Tian Sing; Foster, Stephen J. Development of a mix design methodology for high-performance geopolymer mortars Structural Concrete 2/2013 148-156 Technical Papers

Kurzfassung

This paper presents the development of a mix design method for geopolymer mortar mixes with a principal focus on compressive strength. The method is based on the hypothesis that the overall strength of geopolymer mortar depends on the strength of the geopolymer binder materials, the packing density of the aggregates in the mortar and the amount of geopolymer binder. First, the strength of the binder was evaluated experimentally. Fly ash obtained from two different sources and ground granulated blast-furnace slag were used as the main ingredients in the production of the geopolymer binder. Correlation between the packing density of the aggregates in the mortar and their influence on the binder demand and compressive strength were investigated. Finally, a conceptual framework for a geopolymer mortar mix design approach is proposed. In addition to describing the mortar mix design methodology in a rational way, it is hypothesized that the approach can also be extended to the development of a geopolymer concrete mix.

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Clément, Thibault; Ramos, António Pinho; Fernández Ruiz, Miguel; Muttoni, Aurelio Design for punching of prestressed concrete slabs Structural Concrete 2/2013 157-167 Technical Papers

Kurzfassung

Prestressing in flat slabs helps to control deformations and cracking under service loads and allows the required slab thickness to be reduced, thus leading to more slender structures and an economic solution for long spans. However, as a consequence of the limited thickness of these members, punching typically governs at the ultimate limit state. Studies of the punching shear strength have shown that the presence of prestressing in flat slabs has a number of potential beneficial effects, namely the vertical component (force) carried by inclined tendons, the in-plane compression stresses and the bending moments developed near the supported region. However, the approach provided by codes of practice for punching design in the presence of prestressing may differ significantly. Some codes neglect the influence of the bending moments introduced as a result of prestressing and the sections at which the deviation forces of the tendons are considered may be located at different distances from the edge of the supported region. The influence of prestressing on the punching shear strength of members without shear reinforcement is investigated in this paper by using the fundamentals of the critical shear crack theory. Using that as a basis, and also taking into account 65 tests available in the scientific literature, the suitability and accuracy of a number of design codes, e.g. Model Code 2010, Eurocode 2 and ACI 318-11, are investigated and compared.

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Xiao, Jianzhuang; Fan, Yuhui; Tawana, M.M. Residual compressive and flexural strength of a recycled aggregate concrete following elevated temperatures Structural Concrete 2/2013 168-175 Technical Papers

Kurzfassung

A recycled aggregate concrete (RAC) with different replacement percentages of recycled coarse aggregates (RCAs) (i.e. 0, 30, 50, 70, 100%) was investigated experimentally at elevated temperatures. The residual compressive strength as well as the residual flexural strength of the RAC following elevated temperatures was studied and evaluated. A relationship between the residual compressive flexural strength of RAC and the elevated temperature was proposed. Furthermore, the relationship between the residual flexural strength and the compressive strength of the RAC was compared and analysed. It was found that both the residual compressive strength and the residual flexural strength of the RAC decrease with a rise in temperature, and the effect of the RCAs replacement percentage on the residual flexural strength and the residual compressive strength of RAC was found to be obvious.

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Khazraiyan, Najmeh; Liaghat, Gholam Hossein; Khodarahmi, Hossein Normal impact of hard projectiles on concrete targets Structural Concrete 2/2013 176-183 Technical Papers

Kurzfassung

This research study involves obtaining an analytical model for the perforation of unreinforced concrete targets by a hemispherical hard projectile. Dynamic cavity expansion theory and the reflection of compressive waves from the end of the concrete targets are used for developing the analytical model. The effect of the friction coefficient is also investigated in the analysis. Numerical modelling of the problem has been performed in LS-DYNA code for validating the analytical results. Johnson-Holmquist concrete and rigid material models have been employed for the concrete and the projectile respectively. The impact velocity range considered in this work is between 250 and 850 m/s. No projectile erosion is considered in this range. The analytical results have been compared with numerical results and show good agreement with numerical simulations.

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fib-news: Structural Concrete 2/2013 Structural Concrete 2/2013 185-191 fib-news

Kurzfassung

• 2013 fib symposium in Tel Aviv: Engineering a Concrete Future
• 2013 fib Medal of Merit and Honorary Membership
• 2013 Achievement Award for Young Engineers
fibUK meeting
• Advances in Cement and Concrete Technology in Africa (ACCTA)
• Report from the Norwegian fib Member Group)
• Congresses and symposia

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Contents: UnternehmerBrief Bauwirtschaft 2/2013 UnternehmerBrief Bauwirtschaft 2/2013 Contents

Kurzfassung

No Abstract.

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Schalk, Günther Wer nicht wirbt, der stirbt ?? UnternehmerBrief Bauwirtschaft 2/2013 1 Editorial

Kurzfassung

No Abstract.

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Kurz infomiert UnternehmerBrief Bauwirtschaft 2/2013 2 Kurz informiert

Kurzfassung

Mit dem BauGB im Kampf gegen verwahrloste Immobilien
Finanzierungslücke im Verkehrsbereich “alarmierend”
Getrübte Erwartungen der Architekten

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Riesterer, Ramona Öffentlichkeitsarbeit - auch für kleine Baufirmen ein Thema! UnternehmerBrief Bauwirtschaft 2/2013 3-10 Berichte

Kurzfassung

Autohäuser, Restaurants, Bekleidungsgeschäfte und Supermärkte - für alle ist Werbung selbstverständlich. Aber für Bauunternehmen? Auch eine Baufirma braucht Werbung. Die Kombination entpuppt sich in der Praxis allerdings vielfach als kompliziert und ungelenk: Die Kommunikationswissenschaft und das Fach Marketing stellen zwar viele Modelle und Handlungsempfehlungen bereit, die (auch Bau-)Unternehmen dabei helfen sollen, ihre externe Kommunikation strategisch und operativ optimal zu gestalten. Doch viele Unternehmer, nicht nur kleine Firmen, blicken eher etwas ratlos auf bis zu 12-stufige Kommunikationsmanagement-Prozesse [1] und fragen sich, woher man Zeit und Geld nehmen soll, um in der Praxis abzubilden, was in der Theorie wortreich beschrieben ist.

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Fuchs, Bastian; Schalk, Günther Aktuelles aus der Rechtsprechung UnternehmerBrief Bauwirtschaft 2/2013 11-13 Berichte

Kurzfassung

No Abstract.

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Gewerbeertrag: Einspruch trotz Vorläufigkeitsvermerks UnternehmerBrief Bauwirtschaft 2/2013 14 Berichte

Kurzfassung

No Abstract.

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Steuererklärung jetzt zwingend elektronisch einzureichen? UnternehmerBrief Bauwirtschaft 2/2013 14 Berichte

Kurzfassung

No Abstract.

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Telefonkosten auf beruflicher Auswärtstätigkeit UnternehmerBrief Bauwirtschaft 2/2013 15 Berichte

Kurzfassung

No Abstract.

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