Versuche zur Ermittlung der Eigenschaften von gebrochenem Verbundsicherheitsglas (VSG) und Berechnung der Resttragfähigkeit eines Glasbogens

Tests to determine the characteristics of broken laminated safety glass and a calculation of the remaining structural capacity of a glass arch. The aim of this work is to show, in an exemplary way, using a glass arch with tension rod possibilities to calculate the remaining structural capacity of broken laminated glass. To achieve this aim tensile and bending tests on PVB‐foil and broken laminated safety glass were carried out at 10 °C. Furthermore experiments to determine the friction between broken laminated glass and steel and neoprene were performed.     

Großelement‐Dämmtechnik (GeDt) zur energetischen Fassadensanierung

Technology of large‐sized heat‐insulating elements for energetic redevelopment of facades. Sustainable reduction of heating energy – required for our buildings – can be reached by additional insulation of existing old building facades. Sometimes homeowners interest about the heat‐insulating redevelopment of their building facades seemed to be quite small, because of longer construction times and restrictions by scaffolding, noise and pollution often concerned with conventional technologies. New impulses for the realization of additional redevelopment measures can be given by innovative, timesaving and less disturbing redevelopment technologies – like the following described. So the federal ministry for economy and technology and 4 industry partners promoted the research project “Energetic redevelopment of facades with industrial prefabrication technologies” [1], [2] at the University of Bochum (Institute of constructional civil engineering). In the context of this research project all essentials of the technology of large‐sized heat‐insulating elements for sustainable heating energy saving redevelopment of facades were developped. This technology is based on large‐sized heat‐insulating elements (height of about 2,80 m and length up to 8 m) considering aspects of structural analysis, physics relating to construction and assembling elements. For the application of the large‐sized elements at building facades two fixing systems were created and tested – one based on dot‐shaped fixings, the other on bar‐shaped fixings. To ensure the prefabrication of those large‐sized redevelopment elements and their exact assembling the development of a contactless surveying and marking out system was necessary – separately realized at the University of Bochum (area of geodetics). Large size and system‐specific implementation details of the redevelopment elements mentioned above caused the development of suitable tools for assembling and transporting elements.     

Rechnerischer Nachweis der Randverformungen bei Wärmedämmverbundsystemen (WDVS) mit Holzfaserdämmplatten und großer Dämmdicke bis ca. 200 mm

Numerical analysis of edge deformations in external thermal insulation compound systems with wood‐fibre insulating boards and large insulation thickness up to approx. 200 mm. In Germany, external thermal insulation compound systems (ETICS) with wooden fibreboards are regulated by approvals. So far, the thickness of the thermal insulation was limited to 120 mm, however, some companies wanted to be free to use thicker thermal insulation. Therefore, it seemed to be necessary to have a closer look on tensions and deformations of the system. This article comprises methods for the assessment of system deforma tions of ETICS with mechanical fixed wooden fibreboards. Due to the complexity of the topic, this article is structured as following: – hygric and thermal expansion of the thermal insulation, and – hygric and thermal expansion of the rendering plane‐parallel to the surface. The article concludes that it is not necessary to regard additional requirements for thermal insulation material with larger thickness than 120 mm. The calculated deformation of approx. 1,8 mm during a loading condition “primal shrinkage and temperature change” of a theoretically endless ETICS will generate to micro cracks, which are uncritical in general. Furthermore, this article provides options for more precise calculations of deformations of ETICS.