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| :: FLEXURAL AND PUSH-OUT TESTS |
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The Solaio Compound, patented and manufactured by Coperlegno S.r.l., is a glulam + concrete deck composed of:
- Glulam beams with a special milling on top.
- Malta tripe into the milling.
- Steel joist (FeB44k) with 7 cm base and 9.5 / 12.5 cm height.
- Decking elements
- Upper concrete slab that forms the necessary rigid element assuring the right connection between vertical structures.
Regulatory requirements
All the tests where performed using the prescription of the "Nicole Document": in the presence of one-dimensional wooden element formed of several elements assembled and connected to each other by mechanical, it prescribes calculations and studies using a linear mathematical relations between stress and slide and considering the shifts along the interfaces between the elements; when considering the case of glulams (wood element) coupled using connectors with a different material, the calculations must be done according to the classical constructions methods.
Instead in case of unions between Glulams (wood) and Concrete, the “Nicole Document” prescribes that the weight-bearing capacity and the rigidity of this configuration must be determined experimentally with the exception of the following cases:
- Cylindrical connectors laterally strained
- Cylindrical connectors axially strained
- Connection with concrete pawl wedge in wood
In the images shown are generated by a numeric model using the software Ansys 9.0 and represent the geometry, the deflection analysis and the stresses of the model.
An examination of the deformed one can draw the following observations:
- The deformation of glulams is much greater than those of the conglomerate;
- Predominant deformations in the glulams are longitudinal;
- It can be observed the crushing of the front of the wood pawl;
- The backs of the internal wood pawls are almost intact while the last wood pawl shows a prominent deflection
These images show the distribution of tensions resulting from the software Ansys 9.0.
In particular, they show the distribution of compression parallel to the fibers.
PUSH-OUT TESTS
Results
The tests were performed on days 12, 13, 14, 15, 18, 19 and 20 of June 2007 at the laboratory testing materials and structures. The temperature stood at 25 ° C and relative humidity was 60%.
For each test are shown:
- The main values obtained during the tests (tensile strength Fu and it’s relative average shift d(Fu) )
- The resistance referred to the length of the connection;
- The mode of collapse observed;
- A photo relevant to the mode of collapse observed;
- The load-shift diagrams of the 4 displacement transducers;
- The medium experimental load-shift diagram;
- The numerical values of the average shifting, related to a pre-defined levels of the F (tensile strength) compared to the Fu;
- Rigidities calculated at fixed levels of loading F compared with tensile strength Fu;
- Rigidities normalized to the standard length of the connection calculated at a pre-defined level of F (tensile strength) compared to the Fu.
FLEXURAL TESTS
The cast of the concrete was made April 18 2007.
During the maturation of the concrete cast and in conjunction with the loading tests were carried out No. 10 destructive tests on cubic samples of concrete taken during the second concrete cast following the UNI 6132/72 prescriptions, resulting in the strength values given in Table 4.1.
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