Experimental Study on Tensile Performance of Embedded Truss-Type Curtain Wall Connections in Insulated Sandwich Wall Panels
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摘要: 提出了一种桁架式幕墙连接节点,采用预埋钢筋桁架实现夹心保温墙板与幕墙体系之间的连接。设置不同的钢筋桁架腹杆直径(8,10,12 mm)、桁架内弦杆焊点间距(100,130 mm)和保温层厚度(80,120 mm),对5个幕墙节点试件进行了抗拉力学性能试验,研究了节点试件的破坏过程、荷载-位移关系、抗拉承载力和变形能力等。试验结果表明:预埋桁架式幕墙连接节点的受拉破坏模式包括锚板内侧局部混凝土的开裂和剥落、锚板受弯屈服以及钢筋桁架外弦杆焊点断裂失效;试验过程中内叶板和预埋钢筋桁架之间未出现锚固破坏;所有节点试件的屈服承载力相近,抗拉承载力均满足设计荷载要求,且具有较大的安全储备量;增大钢筋桁架的腹杆直径能够增加幕墙节点的抗拉承载力和塑性变形能力,而桁架内弦杆焊点间距和保温层厚度对幕墙节点的抗拉承载力和塑性变形能力的影响较小。Abstract: In this paper, a truss-type curtain wall connection was proposed, which used embedded steel bar trusses to connect the insulated sandwich wall panels and curtain wall systems. Considering different steel truss web member diameters (8, 10,12 mm), spacing of welding joints on the inner truss chord member (100,130 mm), and insulation layer thickness (80,120 mm), tensile mechanical performance tests were conducted on five curtain wall connection specimens to study the failure process, load-displacement relationships, tensile strength and deformation capabilities of the connection specimens. The experimental results indicated that the tensile failure modes of the embedded truss-type curtain wall connections included the cracking and spalling of local concrete on the inner side of the anchor plate, flexural yielding of the anchor plate, and fracture failure of welding joints on the outer truss chord member. During the tests, no anchorage failure occurred between the inner leaf plate and the embedded steel trusses. All connection specimens exhibited comparable yield strength, with tensile strength not only satisfying the design load requirements but also exhibiting substantial safety margins. Increasing the steel truss web member diameter can increase both the tensile strength and plastic deformation capability of the curtain wall connection, while the spacing of welding joints on the inner truss chord member and the thickness of the insulation layer showed little influence on these mechanical properties.
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