低能耗夹芯保温墙桁架连接件拉剪试验研究

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

预制混凝土夹芯保温墙内外叶墙板间的桁架连接件在外墙板重力和风吸力作用下处于拉剪受力状态。为研究桁架连接件的拉剪复合受力性能,针对佩克PD型桁架连接件,对6个拉剪模型进行试验研究。试验结果表明:在拉剪作用下,保温层厚度不变时,夹芯墙的抗剪承载力随着拉力的增大而减小;而在拉力不变条件下,随着保温层厚度的增加,夹芯墙的抗剪极限承载力和变形均增大;由试件的最终破坏形态可知,桁架连接件在拉剪复合受力下的破坏形式表现为受力较大腹杆拉断或节点处焊点拉开。由试验所得该类桁架连接件的拉剪承载力大于现行设计承载力取值,具备一定的安全储备。

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.