Concrete Plant + Precast Technology Betonwerk ... - BFT International
Concrete Plant + Precast Technology Betonwerk ... - BFT International
Concrete Plant + Precast Technology Betonwerk ... - BFT International
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54. BetonTage Kongressunterlagen |<br />
given anchorage type is the criterion for determining<br />
the crack width.<br />
» In calculating the internal forces in the facing panel, the<br />
structural eff ect of the panel and the infl uence of the<br />
shear-elastic coupling of the wall layers (composite action)<br />
have to be taken into consideration. This unintended<br />
sandwich eff ect can lead to considerable longitudinal<br />
tensile forces in the facing panel. Normal forces<br />
and bending moments can be determined based on the<br />
sandwich theory or the theory of elastic bonding. Depending<br />
on the framework conditions of supported or<br />
unsupported facing panels, solutions of diff erential<br />
equation were worked out.<br />
» The loadbearing and deformation behavior of the connection<br />
devices are to be investigated In tests performed<br />
on shear bodies, taking into consideration various types<br />
of insulation material under shear loading. Subsequently,<br />
four-point bending tests are carried out on<br />
three-layered panel strips. Based on the experimentally<br />
determined bond stiff nesses, a good agreement between<br />
the results obtained in the test and the results of<br />
the reanalysis could be shown.<br />
Outlook<br />
Given the great number of infl uencing parameters and<br />
due to the complexity of the determination of internal<br />
forces, it does not appear expedient to cite closed equations<br />
for the design of sandwich walls. Instead, there is a<br />
need for practice-related preparation of the design results<br />
in the form of type-tested tables or design diagrams for<br />
the individual connection devices.<br />
<strong>BFT</strong> 02/2010<br />
Podium 6<br />
eine gute Übereinstimmung zwischen Versuch und<br />
Nachrechnung nachgewiesen werden.<br />
Ausblick<br />
Aufgrund der Vielzahl an Einfl ussparametern und der<br />
Komplexität der Schnittgrößenermittlungerscheint es<br />
nicht sinnvoll, für die Bemessung von Sandwichwänden<br />
geschlossene Gleichungen anzugeben. Vielmehr besteht<br />
für die einzelnen Verbundmittel die Notwendigkeit einer<br />
praxisgerechten Aufbereitung von Bemessungsergebnissen<br />
in Form von typengeprüften Tabellen oder<br />
Bemessungs diagrammen.<br />
References/Literatur<br />
[1] DIBt-Mitteilungen 5/95: Grundsätze zur Temperaturbeanspruchung<br />
mehrschichtiger Wandtafeln mit Betondeckschicht. Mitteilungen<br />
des Deutschen Instituts für Bautechnik, 5/1995, S.148<br />
[2] Gastmeyer, R.: Bemessung der Vorsatzschalen dreischichtiger<br />
Außenwandplatten aus Stahlbeton. Bauingenieur 72, S. 235–240,<br />
Springer VDI-Verlag, 1997<br />
www. -online.info<br />
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