H形钢-木组合梁受弯性能试验研究

发布时间：2018-11-08 11:29

【摘要】：提出一种以焊接H形钢梁为骨架,钢梁翼缘外表面黏结木板组成工字形截面的钢-木组合梁。以组合梁中的木板厚度、钢梁翼缘厚度及宽度、腹板高度为参数,对9根钢-木组合梁进行弯曲性能试验,观察在各级荷载作用下钢板和木板的应变变化、组合梁挠度的发展、破坏过程及破坏形态,探讨其受弯承载力和抗弯刚度等弯曲性能。结果表明,H形钢和木板整体工作性能好,组合效应显著,构件跨中横截面应变呈线性分布。试件荷载-跨中挠度曲线呈弹性和弹塑性两个阶段,最终以下翼缘木材跨中断裂而破坏。随着木板厚度、钢梁翼缘厚度及宽度、腹板高度的增大,试件的承载力呈现不同程度的提高。提出了计算钢-木组合梁跨中挠度及受弯承载力的简化计算式,将其计算结果与试验结果进行对比,结果表明计算式精度较高,可以为钢-木组合梁的应用提供设计依据。
[Abstract]:A kind of steel-wood composite beam with I-shaped cross section composed of welded H-shaped steel beam and external surface of steel beam flange is proposed. Taking the thickness of plank, the thickness and width of steel beam flange and the height of web plate as parameters, the bending behavior tests of 9 steel-wood composite beams were carried out. The strain changes of steel plates and planks and the development of deflection of composite beams under various loads were observed. The failure process and failure mode are discussed, and the flexural properties such as bending capacity and flexural stiffness are discussed. The results show that the H-shape steel and plank have good overall performance, the combination effect is obvious, and the strain of the cross section of the middle span of the member is linearly distributed. The load-span deflection curve of the specimen is elastic and elastic-plastic, and the following flange wood is broken in the middle span. With the thickness of plank, the thickness and width of steel beam flange, and the height of web plate, the bearing capacity of the specimen increases in varying degrees. A simplified formula for calculating the mid-span deflection and flexural bearing capacity of steel-wood composite beams is presented. The results are compared with the experimental results. The results show that the formula has a high accuracy and can provide a design basis for the application of steel-wood composite beams.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：中央高校基本科研业务费专项(2014JBM079)
【分类号】：TU398.6

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