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Structural Concrete 1/2015: Bond and anchorage of embedded steel reinforcement in fib Model Code 2010
This paper describes the changes to design provisions for embedded steel reinforcement in the fib Model Code for Concrete Structures 2010. The changes introduce new coefficients for steel grade and clear spacing between bars, and extend the range of concrete strengths covered. The way in which the contribution of hooks or anchorages is calculated has been revised and the contribution of end bearing to laps and anchorages of compression bars is recognized. The revised rules represent a move away from a distinction between laps and anchorages per se towards a distinction based on the presence or absence of transverse pressure perpendicular to the bar axis within the bond length. The benefits of staggering laps with only a proportion of bars lapped at a section are also reviewed. Finally, the potential impact of lap and anchorage performance on structural robustness is discussed, and it is concluded that this can only be achieved if bar yield precedes splitting mode bond failures.
Structural Concrete 1/2015: Further investigation of transverse stresses and bursting forces in post‐tensioned anchorage zones
In the post-tensioned anchorage zone, the load transfer path of an anchor force can be visualized by an infinite number of isostatic lines of compression (ILCs). The method was initially proposed by Guyon and recently attracted significant interest from a number of researchers. Based on the work of these predecessors, an updated mathematical model has been proposed in order to analyse the bursting forces and the distribution of transverse stresses in the anchorage zone. Compared with the results of a finite element analysis, the updated equations are more accurate than the previous ones. Based on the observation that the sixth-order polynomial expression is better than the fourth-order one, as far as the solution of bursting stresses is concerned, it can be reasonably postulated that a de facto function of the ILCs must exist. Additionally, it is equally interesting that the bursting forces derived with the updated analytical model are the same as those obtained with the formula in the current AASHTO-LRFD Bridge Design Specifications based on numerical stress analyses.
Steel Construction 1/2015: Eurocode 3: Design of steel structures – Present status and further developments
Together with standards for fabrication and erection and harmonized product standards, the structural Eurocodes form the basis for the design of structures and structural products. From April 2010 onwards, the Eurocodes are obligatory for the design of structures and the national design codes have to be withdrawn.
Eurocode 3 covers design of steel structures. This paper gives an overview of the context in which Eurocode 3 exists and of the accompanying codes. The various individual parts of Eurocode3 are mentioned. Attention will be paid to the safety elements such as the partial safety factors for strength and stability. The National Annexes are discussed. Furthermore, corrections and amendments are mentioned and finally an opinion is presented on the possibilities and difficulties the practitioners will experience when using Eurocode 3 and on the future developments that are needed.
Geomechanics and Tunnelling 1/2015: Surge tanks for high head hydropower plants - Hydraulic layout – New developments
High head hydropower plants can generate high electrical power at very short notice, or if equipped with pumps can also draw electricity from the distribution grid and store its energy very efficiently. In this way, hydropower plants can make an indispensable contribution to regulating the grid and the use of regenerative energy sources. Physically, this requires reservoirs at various altitudes connected through headraces.
Mauerwerk - European Journal of Masonry 1/2015: The bending strength of masonry
Bending strength of masonry becomes an important design aspect especially when the walls subjected to lateral loads like, cellar walls which are subject to earth pressure, and façades/ infill walls which are exposed to the wind actions.
Bending strength is required wherever the applied load is perpendicular to the wall. It is also required in non-load-bearing partition walls, where the load applied in both the normal and perpendicular directions. Besides, the tensile properties of the brick/block and lengthwise parameters related to geometry and materials technology also influence the bending strength of masonry.
New publications autumn 2015
New publications from the areas: engineering and steel construction. You can find detailed information on the individual product pages.
Steel Construction Issue 04/15
Cover Story: The servohydraulic biaxial testing machines of the Essen Laboratory for Lightweight Structures (ELLF), Institute for Metal and Lightweight Structures of University of Duisburg-Essen, have maximum loading capacities of 20 kN and 50 kN. The cruciform test specimens are biaxially loaded in the plane of the fabric. (see pp. 222−229). (© ELLF, Institute for Metal and Lightweight Structures, University of Duisburg-Essen)
Jubilee prize competition 2015
To celebrate 20 years of Christmas prize competition there is a special prize. The jubilee is celebrated by presenting a problem which is more challenging than usual, and by establishing a total prize of 10,000 Euro.
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European Journal of Masonry 05/15
Cover story: The Hamburg port warehouse complex, with its interconnecting network of streets, canals and bridges and the modern, brick-built architecture of the office building complex are of unusually universal value and the largest contiguous and unified warehouse complex in the world. (Photo: HHLA)
