意杨旋切板胶合木箱型梁受弯性能试验研究

Experimental Study on Flexural Performance of Poplar Laminated Veneer Lumber Box Beam

摘要: 箱型梁具有强度高、自重轻和受力性能良好等特点。本文将新型工程木意杨LVL与箱型截面形式相结合，研究意杨旋切板胶合木箱型梁受弯性能。通过八组意杨LVL箱型梁和一组实心梁的试验，以翼缘、腹板厚度、梁跨度为变量，对其力学性能、破坏形态等展开研究。分析不同因素对箱型梁承载力的影响，试验结果表明腹板和翼缘厚度对箱型梁受弯性能影响最大，LVL箱型梁出现底部受拉区拉断、腹板翼缘错层和腹板与翼缘拉断等三种破坏形式；经对比数据分析，推算出的箱型梁极限弯矩值与试验实测值较为吻合；旋切板胶合木箱型梁拥有较好的受力性能及较高的利用率，是一种能够适用于建筑结构的工程构件。

Abstract: Box girder has the characteristics of high strength, light weight and good mechanical performance. This paper combines LVL of new engineering Poplar with box section form to study flexural performance of poplar veneer box girder. Eight groups of Yiyang LVL box girders and one group of solid beams were tested. The mechanical properties and failure modes of flange, web thickness and beam span were studied. The influence of different factors on the bearing capacity of box girders is analyzed. The test results show that the thickness of web and flange has the greatest influence on the flexural performance of box girders. LVL box girders have three failure modes, i.e. bottom tension zone rupture, web flange staggered layer and web and flange rupture. Through comparative analysis, the ultimate bending moment of box girders is calculated. The results are in good agreement with the measured values. The plywood box girder with rotary cutting board has better mechanical performance and higher utilization ratio, and it is a kind of engineering component which can be applied to building structures.