轻钢-尾砂微晶发泡板组合墙平面外受力性能试验

本文提出了一种轻钢-尾砂微晶发泡板组合墙,是由内部嵌入钢筋的尾砂微晶发泡板与轻钢龙骨组合而成。为研究其风吸或风压作用下弹性变形性能以及平面外受弯破坏全过程,进行了8个轻钢-尾砂微晶发泡板组合墙足尺试件的单向加载试验。试件参数包括组合墙高度、发泡板强度、嵌入发泡板的钢筋直径、发泡板是否带釉面、发泡板是否复合轻质砌块。每个试件均进行3个工况的加载,前两个工况模拟风吸作用,加载至试件外表面产生裂缝;第三个工况模拟风压作用,加载至试件破坏。采用门式加载架,悬吊试件实现简支,通过简支分配梁将集中荷载分成与试件八点接触加载,各加载点设置球铰支座。研究表明:轻钢龙骨与发泡板有良好的平面外共同工作性能;采取增大组合墙截面高度、提高发泡板材料强度、发泡板设置釉面层、发泡板复合粉煤灰砌块的构造措施,均可提高组合墙的平面外受力性能,复合粉煤灰砌块对提高试件平面外承载能力效果最为显著;利用截面换算方式对组合墙板平面外极限承载力进行计算,计算结果与试验符合较好。结合试验数据及外围护墙板的风荷载计算公式,计算出组合墙的极限风荷载值,为该组合墙的设计及工程应用提供了参考。

Test on the outer plane force performance of light steel-tail sand microcrystalline foam board composite wall

In this paper,a light steel-tail sand microcrystalline foam board composite wall is proposed,which is composed of a tail sand microcrystalline foam board embedded with steel bars and two light steel keels.In order to study the elastic deformation performance of the composite wall under wind suction or wind pressure and the whole process of out-of-plane bending failure,unidirectional loading tests of eight light steel-tail sand microcrystalline foam board combined wall full scale specimens was carried out.The parameters include the height of the combined wall,the strength of the foam board,the diameter of the steel rod embedded in the foamed board,whether the foam board has a glazed surface,whether the foam board is composed of light blocks.Each specimen was loaded under three working conditions.The first two working conditions simulate the wind suction effect.Loading until cracks occur on the outer surfaces of the specimens.The third working condition simulates wind pressure.Loading until the specimen is destroyed.The portal loading frame is used to suspend the specimen to achieve the simple support.The concentrated load is divided into eight points contacted with the specimen by simply supported beam,and the spherical hinged supports are set at each loading point.The research shows that the light steel keel and foam board have good out-of-plane working performance.The structural measures such as increasing the cross-section height of composite wall,increasing the strength of foam board material,setting glaze layer on foam board and compositing fly ash block can improve the out-of-plane bearing capacity of composite wall,and the composite fly ash block has the most significant effect on the out-of-plane bearing capacity of composite wall.The out-of-plane ultimate bearing capacity of the composite wallboard is calculated by the section conversion method.The calculation results are in good agreement with the test.Combined with the test data and the wind load calculation formula of the peripheral siding,the ultimate wind load value of the composite wall is calculated,which provides a reference for the design and engineering application of the composite wall.