EXPERIMENTAL RESEARCH ON TENSILE AND SHEAR ACTION OF TRUSS CONNECTIONS OF LOW-ENERGY SANDWICH INSULATION WALLS

The truss connection between the inner and outer leaf wall panels of the prefabricated concrete sandwich insulation wall is in the tension and shear state under the outer wall panel self weight and wind suction. In order to study the mechanical properties of the truss connection under tension and shear composite stress, 6 tensile-shear models of the Peikko PD truss connection were tested. The test results showed that the shear capacity of sandwich wall decreased with the increase of tensile force when the thickness of insulation layer was constant in the tension and shear state,while the shear capacity and deformation of sandwich wall increased with the increase of thickness of insulation layer when the tensile force was constant.According to the final failure form of the specimens, under the tensile-shear composite stress the failure form of the truss connection was that the web member in larger tension was broken or the welding spot was pulled apart at the joint.The test result showed that the tensile-shear bearing capacity of this kind of truss connectors was larger than the current design bearing capacity,which has a certain safety reserve.