考虑整体效应的盒状压型钢板受弯性能试验研究

Experimental Study on Flexural Behavior of Box-Shape Profiled Steel Sheet Integrating with System Effect

为研究外层钢板及衬檩对盒状压型钢板受弯性能的影响,考虑风压和风吸两种荷载,对8个双层压型钢板的组合试件和2个盒状压型钢板的标准试件进行了受弯加载试验,分析了外层钢板刚度、衬檩高度对盒状压型钢板的受弯承载力、受弯刚度的影响.试验结果表明:1)当衬檩高度为100 mm时,外层钢板为Ⅰ型和Ⅱ型的组合试件相对于标准试件,在风压荷载下的受弯承载力分别提高27.6%和111.3%,受弯刚度提高17.3%和56.7%;在风吸荷载下的受弯承载力分别提高32.1%和77.6%,受弯刚度提高29.4%和48.1%.2)当外层钢板为Ⅱ型时,衬檩高度为200 mm和100 mm的组合试件相对于标准试件,在风压荷载下的受弯承载力分别提高66.9%和111.3%,受弯刚度提高39.9%和56.7%;在风吸荷载下的受弯承载力分别提高59.1%和77.6%,受弯刚度提高33.5%和48.1%.3)考虑外层钢板及衬檩的整体效应可提高盒状压型钢板的受弯承载力和受弯刚度,且外层钢板的刚度越大,衬檩高度越低,提高幅度越明显.4)提出的考虑整体效应的盒状压型钢板受弯计算式其计算结果与试验结果吻合良好.

Box-shape profiled steel sheet is usually used as the bearing element,with external claddings and spacers together,they constitute a double-layer profiled steel sheet wall system.In order to study the influence of external cladding and spacers on the flexural behavior of box-shape profiled steel sheet,8 double-layer profiled steel sheet composite specimens and 2 box-shape profiled steel sheet standard specimens were tested for both pressure and suction loading conditions.The influences of the stiffness of external cladding and the height of spacers on the bending capacity and flexural stiffness of the double-layer profiled steel sheet were analyzed.The test results showed that when the spacer height is 100 mm,compared with the standard specimen,the bending capacity can be increased by 27.6%and 111.3%,and the flexural stiffness by 17.3%and 56.7%for the composite specimens with external cladding type I andⅡ,respectively,under wind pressure loading condition;and the bending capacity can be increased by 32.1%and 77.6%,and the flexural stiffness can be increased by 29.4%and 48.1%respectively for wind suction case.When the external cladding is typeⅡ,compared with the standard specimen,the bending capacity can be increased by 66.9%and 111.3%,and the flexural stiffness by 39.9%and 56.7%for the composite specimens with spacer height 200 mm and 100 mm,respectively,under wind pressure loading condition;and the bending capacity can be increased by 59.1%and 77.6%,and the flexural stiffness can be increased by 33.5%and 48.1%respectively for wind suction case.Thus considering the system effect of the external cladding and spacers,the bending capacity and flexural stiffness of the inner box-shape profiled steel sheet can be significantly improved,and greater stiffness of the external cladding can bring better performance.Based on theoretical analysis and Eurocode,combining with the influence of the stiffness of external cladding and the height of spacers,the global design formula of the box-shape profiled steel sheet is proposed,including system effect.The analytical results obtained using this formula coincide well with the experimental ones.