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Sandwich Panels Subjected to Point Loads: Design Approach Using Effective Widths in Elastic Range
Niklas Ardelmann1, Bernd Naujoks1
1Department of Steel- and Composite-Structures, University of Wuppertal, Pauluskirchstraße 11, 42285 Wuppertal, Germany.
Materials (Basel, Switzerland)
|June 27, 2025
Summary
This study investigates how local loads from attached systems, like photovoltaic panels, affect sandwich panel structural integrity. Findings reveal crucial insights into stress distribution and load-bearing behavior under these specific conditions.
Area of Science:
- Structural Engineering
- Materials Science
- Building Physics
Background:
- Sandwich panels are widely used as self-supporting and insulating elements in hall construction.
- Subsequent installations like photovoltaic (PV) systems or cladding introduce localized point loads to sandwich panels.
- Existing designs primarily account for uniform surface loads, not concentrated or cyclical point loads.
Purpose of the Study:
- To analyze the impact of local load introductions on the load-bearing behavior of sandwich panels.
- To investigate the resulting stress distribution within sandwich panels under these specific loading conditions.
- To develop a design concept for sandwich panels subjected to point loads.
Main Methods:
- Component tests were conducted to determine stress distributions in the elastic range.
- Numerical models were employed to complement experimental data.
- The method of effective widths was utilized to quantify stress concentrations across the panel width.
Main Results:
- Local load introductions significantly alter the stress distribution in sandwich panels compared to uniform loads.
- Stress concentrations were identified and quantified using the effective width method.
- The study provides data on panel behavior under both elastic and ultimate load conditions.
Conclusions:
- The effective width method, based on elastic range analysis, provides a viable approach for designing sandwich panels under local loads.
- Understanding stress concentrations is critical for ensuring the structural integrity and safety of sandwich panels with attached systems.
- The findings inform improved design strategies for sandwich panels in applications with non-uniform loading.
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