Roik M.,Halfen GmbH
Structures and Architecture - Proceedings of the 3rd International Conference on Structures and Architecture, ICSA 2016 | Year: 2016
The technique of textile reinforcing shows it’s advantages where conventional reinforcing methods reach their limitations. Unlike conventional reinforcement, textile reinforcement can be positioned much more precisely in the building element requiring a considerably smaller concrete cover. These textile reinforcements consist of glass- or carbon-fiber mesh which are produced in specialized weaving processes. Special glass or carbon reinforcement with assured spacing between the layers in particular ensure a high manufacturing accuracy through a precise regulation of the reinforcement distance. The use of textile reinforcement is especially appropriate for applications in which very small concrete covers are required. This occurs mainly in cases when the height of a concrete element is strongly limited e.g. in subsequent concrete complements in the course of rehabilitation measures, retrofitting or proofing. Curtain wall facings represent another application range for thin concrete panels. Large-size panels with thicknesses down to 3,0 cm are highly interesting due to their small dead weight. Of course such small thicknesses require special demands towards planning and construction work. Details need to be designed painstakingly and extensively with special focus on the fixings. The fixings are in special focus. Due to the thin concrete panels and due to the reduced effective anchorage depth the fixings have to be examined accurately. Only reduced concrete breakout areas can be provided so the constructions are very sensitive to tolerances. Especially post installed fixings such as dowels or bolts are very sensitive to tolerances and installation conditions so the here examined fixing methods are pre installed fixings, i.e. the fixings are placed in wet concrete. © 2016 Taylor & Francis Group, London.
Agency: European Commission | Branch: H2020 | Program: IA | Phase: EeB-08-2015 | Award Amount: 9.14M | Year: 2015
Heating consumption in the residential sector in Europe is around 2300 TWh/y, DHW consumptions reaches 500 TWh/y, while cooling consumption is less than 100 TWh/y. The construction sector offers unique opportunities to decarbonise the European economy. However, as the replacement rate of the existing stock is very small (1-1.5 % per year), acceleration is needed. On top of this, the reorganisation of the sector poses tremendous challenges due to its extreme fragmentation: more than 50% of the residential buildings are owned by private single owners. Moreover, whilst few major industrial players are active on the market, it is largely dominated (more than 95%) by SMEs both on the manufacturers and the professionals side. BuildHEAT addresses this challenging sector by: - elaborating systemic packages for the deep rehabilitation of residential buildings - developing innovative technologies facilitating the implementation of the renovation measures - developing financial tools enabling large public and private investments - involving the construction chain from the very beginning and all along the building life cycle. A set of reliable, energy efficient and affordable retrofit solutions will be mad available, which execution is facilitated by industrialised, modular and flexible HVAC, faade and ICT systems developed. Despite the affordability, innovative solutions are more expensive compared to off the shelf ones. Therefore financing models are needed to facilitate the massive entry to market of the new technologies. BuildHEAT aims to leverage large private investments by using European structural funds, thus promoting retrofit actions at quarter level. Finally, BuildHEAT involves the entire construction chain from owners to professionals to investors in the retrofit process and all along the lifetime of the building, by addressing technical, behavioural, cultural and economic perspectives. In this way, awareness and involvement are triggered.
Agency: European Commission | Branch: FP7 | Program: BSG-SME-AG | Phase: SME-2 | Award Amount: 3.96M | Year: 2009
The seismic behaviour of connections in precast construction systems has been largely recognized as a crucial matter to be addressed both by the industry sector and by the related research community. In spite of this situation, the complexity of the problem and the variety of inherent issues to be harmonizedly dealt with in proposing design procedures for connections and precast structures as a whole, have made it difficult so far to conceive self-sufficient solutions and approaches of general validity. Scope of SAFECAST is to give effective answers to this need of self-sufficient, harmonized solution of the problems of correct seismic design of joints and connections in precast structures. The innovative aspect of the project is the unified performance based perspective in which the problem of the characterization of the seismic behaviour of connections will be dealt with. Such complex problem, in fact, needs to be dealt with in a unified performance based framework, since when dimensioning and designing the system for an optimum performance under earthquake loading, all the other basic performance requirements, i.e. durability, deformability limits, energy dissipation, are also to be taken into account and complied with. The proposed consortium represents a unique combination of countries joined by two peculiar characteristics: for all of them seismic loads play a fundamental role in the construction sector. Secondly, all partners are concrete counties, nations for which concrete is the main construction material. For these reasons, the immediate expected consequence of the proposed project is to improve competitiveness of precasting, as a sector, to promote a general increase in the quality and safety of constructions offered to the market and end-users in general, to enhance the contents of precast building solutions in terms of quality guarantee, performance optimization, reliability, safety in the event of an earthquake.
Ricker M.,Halfen GmbH
Bauingenieur | Year: 2011
Several punching tests on compact footings with and without shear reinforcement were conducted at RWTH University by the Institute of Structural Concrete (IMB) and the Institute of Geotechnical Engineering (GiB). Additional nonlinear finite element analyses were performed to investigate the influence of the main parameters on the punching shear strength more in detail. After calibrating by existing punching tests on compact footings, the numerical results were in good accordance with the experimental failure loads as well as with the measured strains. As main parameters on the punching shear strength, the shear slenderness, the concrete strength, the size effect of the effective depth, and the ratio of the column perimeter to the effective depth were investigated. The numerical model revealed a change of the failure mode in dependence of the shear slenderness and confirmed the observations in tests. Additional parametric studies on footings including shear reinforcement confirmed the influence of the spacing of the stirrups on the punching strength.
Ricker M.,Halfen GmbH |
Hausler F.,Halfen GmbH
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2014
Double-headed studs are used as punching shear reinforcement in reinforced or prestressed slabs and footings. Owing to an improved anchoring behaviour, double-headed studs have a higher load capacity than stirrups. Doubleheaded studs are quick to install and are therefore more cost-effective than stirrups. Previously in Europe, national technical approvals specified the design of double-headed studs. Since the end of 2012, European technical approvals have been available. All approvals are based on the same design method, which is used in combination with BS EN 1992-1-1. It is necessary to distinguish between punching shear failure in slabs and foundations with and without shear reinforcement. In slabs and foundations with shear reinforcement, a failure can occur at maximum load level, in and outside the shear-reinforced zone. The European technical approvals provide design equations for all types of failure modes. To quantify the safety level of the design provisions for slabs, footings, and ground slabs with and without shear reinforcement, test evaluations based on a reliable data bank are shown. The paper also provides useful background information and additional design recommendations for applications, which are not covered by the design provisions of the European technical approvals. © 2014, Thomas Telford Services Ltd. All rights reserved.
Halfen GmbH | Date: 2015-02-12
A bolt having a head and a shank fixed to the head. The shank having an end side remote from the head. A base face and a relief are formed on the end side of the shank. The relief is molded at least partially in a three-dimensional manner from the base face. The end side is realized in an at least partially colored manner.
Halfen GmbH | Date: 2015-09-03
A structure has a plate and a strengthening element made of high-strength concrete which increases the punching shear strength. The strengthening element is configured to have an annular shape and an opening. The strengthening element is made of multiple prefabricated segments which are arranged in an annular shape around the opening.
Halfen GmbH | Date: 2013-04-12
A thermally insulating construction component for arranging between two load-bearing parts of a building includes an elongate insulating body and also reinforcing bars extending therethrough transversely with respect, to its longitudinal direction. Bearings project from side walls of the insulating body and absorb thrust and shear forces. The insulating body includes an upper and a lower parallelepipedal dimensionally stable box member filled with insulating material. The insulating body further includes a further dimensionality stable box member which is filled with an insulating material and which is arranged as a middle box member between the upper-box member and the lower box member. The middle box member is fixedly connected to the upper box member and the lower box member.
Halfen GmbH | Date: 2016-04-18
The invention relates to an anchoring rail with a substantially C-shaped cross section for anchoring in concrete. The anchoring rail comprises a cross-sectionally substantially U-shaped base body, two free limbs and at least one anchor. The two free limbs are arranged on the base body opposite the anchor and, between the free limbs, a slot is formed in the longitudinal direction of the anchoring rail. The base body at least partially has a profiling on the outer side thereof facing the concrete.
Halfen GmbH | Date: 2016-04-18
The invention relates to an anchoring rail with a substantially C-shaped cross section for anchoring in concrete. The anchoring rail includes a cross sectionally substantially U-shaped base body, two free limbs and at least one anchor. The base body includes a base and two side walls. The two free limbs are arranged opposite the base of the base body. The at least one anchor is arranged on the base. Between the free limbs, a slot is formed in the longitudinal direction of the anchoring rail. The anchoring rail has at least one thickened portion on the base body.