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We propose a testing protocol that can be combined with widely available analytical methods to assess the mechanical properties of shear connectors for use in the design of insulated concrete wall panels to predict full-scale insulated panel behavior.
This document contains recommendations for performing a non-standard, double-shear test suitable for both continuous and discrete insulated concrete sandwich wall panels (ICSWPs). Such a standardized test does not exist, but several iterations of this and similar tests have been performed in the literature to varying degrees of success. Further, the tests in the literature are rarely-if ever-described in detail or discussed at length with respect to the testing, data analysis, or safety procedures. A test specimen configuration is recommended herein, and variations are discussed. Important mechanical properties are identified from the load versus displacement data, and their extraction is detailed. The use of test data for design, such as for determining the stiffness of the connectors, is briefly demonstrated to show how ICSWP deflection and cracking behavior may be calculated. The strength behavior of panels may be determined using the full load versus displacement curve or only the maximum connector strength. Shortcomings and unknowns are acknowledged, and significant future work is delineated.
Insulated concrete sandwich wall panels (ICSWPs) comprise a layer of insulation placed in between two concrete layers, often called wythes, which synergically provide a thermally and structurally efficient component for building envelopes or load-bearing panels1 (Figure 1). To adapt to the rapidly changing construction industry and new building code regulations on thermal efficiency, precasters are fabricating ICSWPs with thinner concrete layers and thicker insulation layers with higher thermal resistance; additionally, designers are using more refined methods to account for the partially composite interaction of t....
1. Fabricating the testing specimen
Figure 8 and Figure 9A show a typical load per connector versus the average displacement curve resulting from a double-shear test of a fiber-reinforced polymer (FRP) connector in the laboratory. As the figures depict, the load increases steadily up to the maximum point and then drops dramatically, which is typically observed in most testing involving polymers. However, as Figure 9B suggests, the curve flattens after the maximum load.......
Many researchers have used some variation of this type of test for ICSWP, but this is the first instance of outlining all the individual steps. The literature does not address the critical steps in testing, including sensor types and specimen handling. This method describes a manner of testing that mimics more closely the behavior of the connectors when a panel is loaded in flexure as opposed to the single-shear test. There are several variables for this work that are yet to be studied. Specifically, information related .......
The authors have nothing to disclose.
The work described above was not directly financed by a single organization or over the course of a single grant, but the information was gathered over years of industry-sponsored research. To that end, the authors thank their sponsors from over the last decade and are grateful to work in a rapidly evolving industry.
....Name | Company | Catalog Number | Comments |
Battery-powered Drill | |||
Concrete Screws | 50 mm long commercial concrete scews. | ||
Data Logger | Capable of sampling at a frequency of at least 10 Hz. | ||
Double Shear Test Specimen | Fabricated according to the dimmensions in the testing protocol. | ||
Four Linear Variable Displacement Transformer | With at least 25 mm range for Fiber-reinforced Polymer (FRP) connectors and 50 mm for ductile steel connectors. | ||
Hydraulic Actuator | With at least 50-Ton capacity. | ||
Lifting anchors rated at 1 Ton | |||
Load Cell | With at least 50-Ton capacity. | ||
Load Frame | Capable of resisting the forces generated by the testing specimen. | ||
Polytetrafluoroethylene (PTFE) Pads | 3 mm x 100 mm x 600 mm | ||
Ratchet Strap | At least 50 mm wide. | ||
Steel angle | |||
Steel Plate | Two 20 mm x 150 mm x 150 mm steel plates. | ||
Steel Washers | Capable of producing a separation of at least 5 mm between the steel angle and the specimen. |
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