一種新型復合木梁的受彎性能研究
楊會峰，劉偉慶
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(南京工業(yè)大學土木工程學院，南京 210009)［摘要］主要研究了楊木旋切板膠合木(LVL)受彎構件的結構性能，建立了受彎構件的計算模型。通過試驗，探討了材料的部分物理力學性能，分析了受彎構件的破壞形態(tài)與破壞機理，并將其受彎性能與建筑中常用的鋸材構件作了對比分析。試驗結果表明，LVL梁的結構性能大大超出了鋸材構件，其不僅具有較高的強度與剛度，還具有較低的強度變異性；分析了旋切板厚度與荷載作用方向?qū)嫾Y構性能的影響；驗證了平截面假定。利用極限應變法對構件的彎曲性能進行了理論分析，其結果與試驗結果吻合良好。［關鍵詞］復合木材；旋切板膠合木；梁；受彎性能；試驗研究；理論分析Study on flexural behaviour of a novel wood composite beamYang Huifeng, Liu Weiqing(College of Civil Engineering, Nanjing University of Technology, Nanjing 210009, China)Abstract:The structural behavior of poplar laminated veneer lumber (LVL) beams is reported, and a design model is put forward. Based on the experimental work, some physical and mechanical behaviors of the materials are discussed. And then the failure modes and failure mechanism of the tested beams are analyzed. Also the flexural behaviors are studied and then compared with structural sawn timber beams. The experimental results show that the structural behaviors of LVL beams are much better than those of sawn timber beams. Its strength variability is lower as well as it has higher strength and stiffness for LVL beams. In addition, the influences of the veneer thickness and the load direction on the structural performance are discussed. Also the test results show that the plane cross-section assumption is valid. Moreover, the limiting strain method is used in the theoretical study of the flexural behavior of the beams, and the theoretical analysis shows a good agreement with the experimental results.Keywords:wood composite; LVL; beam; flexural behaviour; experimental study; theoretical analysis*國家自然科學基金資助項目(50578075)；南京工業(yè)大學青年教師學術基金2009年度重點項目(39713006)。作者簡介：楊會峰，博士，講師，Email:yhfbloon@163.com。參考文獻［1］LIU W Q, YANG H F. Advanced glued laminated construction and its engineering applications［C］//8th International Symposium on Structural Engineering for Young Experts (ISSEYE-8), Xi’an, China, 2004: 698-703.［2］YANG H F, LIU W Q, JIANG D M, et al. Study on material and structural behaviors of engineered wood composite beams［C］//Proceedings of the International Symposium on Innovation & Sustainability of Structures in Civil Engineering (ISISS-2005), Nanjing, China, 2005: 2503-2511.［3］MILNER M W, BAINBRIDGE R J. New opportunities for timber engineering［J］. The Structural Engineer, 1997, 75(16)：278-282.［4］OZARSKA B. A review of the utilization of hardwoods for LVL ［J］. Wood Science and Technology, 1999, 33：341-351.［5］ISSA C A, KMEID Z. Advanced wood engineering: glulam beams［J］. Construction and Building Materials, 2005, 19: 99-106.［6］SERRANO E, GUSTAFSSON P J, LARSEN H J. Modeling of finger-joint failure in glued-laminated timber beams［J］. Journal of Structural Engineering, ASCE, 2001, 127(8): 914-921.［7］BULLEIT W M, SANDBERG L B, WOODS G J. Steel reinforced glued-laminated timber［J］. Journal of Structural Engineering, ASCE, 1989, 115(2): 433-444.［8］BULLEIT W M. Reinforcement of wood materials: a review［J］. Wood and Fiber Science, 1984, 16(3): 391-397.［9］TRIANTAFILLOU T C, DESKOVIC N. Prestressed FRP sheets as external reinforcement of wood members［J］. Journal of Structural Engineering, ASCE, 1992, 118(5): 1270-1284.［10］KRUEGER G P, SANDBERG L B. Ultimate-strength design of reinforced timber: evaluation of design parameters［J］. Wood Science, 1974, 6(4): 316-329.
