The two-shearfield test – A suitable method for the empirical shear capacity design of masonry.
by Dipl.-Ing. Viktor Dunjic, Dipl.-Ing. Andreas Rudisch, Univ.-Prof. Dipl.-Ing. Dr. techn. Andreas Kolbitsch.
The investigations demonstrate that the two-shearfield test is a suitable method for the determination of the shear capacity of masonry. The testing equipment is mounted directly on the wall in order to retain realistic boundary conditions like stiffness, load and prior damage. The behaviour factor q and the capacity curves of certain masonry walls can be directly obtained from the experimental results and realistic material behaviour in earthquake design can be represented. In particular, existing masonry can be assessed realistically with methods like the response spectrum, the push-over and the capacity spectrum by using the two-shearfield test.
The full article has been published in issue 05/2016 of the journal Mauerwerk - European Journal of Masonry.
This book presents the theoretical background as well as best practice examples of estimating in heavy construction. In this way the book helps to avoid errors in estimating of machine-intensive construction projects like roads, bridges, tunnels, and foundations.
The jury chose the new prize winner of
Ulrich Finsterwalder Structural Engineering Award 2017
The jury session for the Ulrich Finsterwalder Structural Engineering Award 2017 took place on 11 November 2016 in rooms provided by the TU Berlin. At the end of the day, the jury voted by a majority for the
Refurbishment of the Kochertalbrücke, Geislingen
Fore more projects were chosen for award prizes:
- Ribbed Vault of the Chapel of the Castle in Dresden
- Hagneck Hydropower Station
- Tram Stop at the Main Station, Berlin
- Ship Lift at the Three Gorges Dam, Sandouping (China)
More information, the rationals of the jury, images and all 34 entries you can find at: www.ingenieurbaupreis.de (in German)
Thomson Reuters recently published the impact factors 2015 for scientific journals. Our journal Beton- und Stahlbetonbau (Concrete and Reinforced Concrete Structures) is still our most-cited German language journal, followed by Bautechnik (Construction Technology) and Stahlbau (Steel Structures). The journal Structural Concrete has achieved a notable place in the international landscape of scientific journals for civil and structural engineering.
This book contains more than 70 articles and presents international trends in structural glazing and facade construction. Renowned authors from all over the world report on current research results and innovative construction projects.
New approach for spacing of movement joints in reinforced and unreinforced masonry veneer walls.
by Prof. Ir.arch. Dirk R.W. Martens
The spacing of movement joints has been subject of many discussions. The current methods for the determination of the spacing of movement joints are based on local traditions and bad experience with cracked veneer walls. This has resulted in various design rules throughout Europe with very stringent limits for spacing of movement joints. According to EC6, one of the solutions for increasing the spacing of movement joints is to introduce bed joint reinforcement, although unfortunately no specific design rules are given. Until now, most scientific research has been focused on numerical simulations without taking time-dependent effects into account, which is a conservative approach. In this paper, a new approach is described. It is based on Peter Schubert's model and on practical experience with masonry buildings.
The full article has been published in issue 04/2016 of the journal Mauerwerk - European Journal of Masonry.
TBM Tunnel under the Bosphorus for the Istanbul Strait Road Crossing Project
The population increase in Istanbul is also reflected in car ownership, which brings an extensive traffic load to the city, especially to the two bridges over the Bosphorus. After feasibility studies, a double deck, 3.4 km subsea tunnel with a 13.7 m diameter at a maximum depth of 106 m below sea level and a capacity of 100,000 cars/day was initiated as a solution for the city. The tunnel, excavated by a custom-made mixshield slurry TBM, passes through very complex geological structures including the Trakya formation, transition zones and marine sediments in a highly seismic area.
The full article is published in issue 04/2016 of the journal Geomechanics & Tunnelling.
Reading Recommendation: TBM Excavation in Difficult Ground Conditions - Case Studies from Turkey
Romanian projects and integral bridge solutions based on composite dowels
by Assoc. Prof. Dr.-Ing. Edward Petzek, Dipl.-Ing. Victor Schmitt, Dipl.-Ing. Elena Meteş, Dipl.-Ing. George Ispăşoiu and Dipl.-Ing. Alexandru Ţurcan
The design and construction of sustainable and durable bridges with low maintenance costs is one of the tasks of road and railway administrations of the European Countries. The structures must be safe, economical and need less maintenance during their service life. All these needs can be found in integral abutment bridges. This solution, which eliminates the bearings and expansion joints, leads to low construction and maintenance costs. Integral bridges also have good earthquake resistance. Bridges are vital structures in the transport infrastructure; it is a fact that, in the last decades, composite bridges have become a popular solution in many European countries as a cost-effective and aesthetic alternative to concrete bridges. Their competitiveness depends on several aspects, such as site conditions, local costs of materials and personnel and the contractor's experience.
The full article is published in issue 03/2016 of the journal Steel Construction.
Taken from the technical paper Background to the European seismic design provisions for retroﬁtting RC elements using FRP materials:
"[...] Fibre reinforced polymers (FRP) were introduced into civil engineering practice in the early 1990s, but they only became popular after they became known for their effectiveness as a fast remedy when retroﬁtting damaged reinforced concrete and masonry structures in the wake of the catastrophic earthquakes at the end of that decade (Northridge, 1994, Kocaeli, 1999, Athens, 1999). Since that time, extensive research has been undertaken to support design procedures for retroﬁts with FRP wraps and laminates, leading to several versions of design guidelines. [...] A large part of the research effort was directed towards the development of conﬁnement models, whereas all other actions were primarily considered for static loads (shear and anchorage). Earthquake retroﬁt detailing was hampered by the need to address global structural response issues as well in order to determine the retroﬁt priorities, whereas the literature on models that could support the development of guidelines was already marked by signiﬁcant discord regarding the deformation indices of retroﬁtted behaviour, thus complicating the detailing process.
The aim of this paper is to establish a new-generation framework for the design of seismic retroﬁts using FRP materials. Following prevailing earthquake and design practice, the paper establishes performance-based criteria for global and local retroﬁt requirements so that the rehabilitated structure can develop acceptable, repairable levels of damage in a severe earthquake and minimal (limited) levels of damage in the frequent event. The aims of FRP retroﬁt designs are the enhancement of strength and deformation capacity as well as the mode of failure control of the structure and its individual structural members. It is intended that this paper should serve as the background for the development of European seismic retroﬁt provisions using FRPs. [...]"
The full article is available online for free until November 19th, 2016. Contiune reading on WileyOnlineLibrary.
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