Ultimate bending capacity evaluation of laminated bamboo lumber beams
Ultimate bending capacity evaluation of laminated bamboo lumber beams
复制标题
DOI：
10.1016/j.conbuildmat.2017.11.058
复制
发表时间：
2018-01-30
影响因子：
7.4
通讯作者：
Su, Jingwen
中科院分区：
文献类型：
--
作者：
Li, Haitao;Wu, Gang;Su, Jingwen
为了评价竹材叠合梁的抗弯性能，进行了材料性能试验和梁试验。基于平行于颗粒进行的压缩和拉伸试验，提出了一个应变-应力关系。根据梁试件中裂纹的位置，确定了两种破坏模式。弯曲方向和内部节点的位置对LBL梁的力学性能有影响。内部关节对切向弯曲(其中秆弯曲横跨其宽度)下的标本比在径向弯曲(其中秆弯曲横跨其厚度)下的标本有更多的影响。在不考虑弯曲方向的情况下，层合竹梁的横截面应变在整个试验过程中呈线性变化，遵循标准梁理论，基于该理论和建议的梁的简化应变-应力关系，提出了三种弯曲破坏模式下的极限弯矩和极限弯曲挠度的计算方法，与试验结果吻合较好。皇冠版权所有(C)2017由爱思唯尔有限公司出版。保留所有权利。
In order to evaluate the bending capacity of laminated bamboo lumber (LBL) beams, material performance tests and beam tests have been carried out. A strain-stress relationship is proposed based on compression and tensile tests conducted parallel to the grain. Two failure modes are identified based on the locations of cracks in the beam specimens. Direction of bending and the location of internal joints are shown to influence the mechanical properties of LBL beams. Internal joints have more influence on specimens under tangential bending (where the culms are bent across their width) than that under radial bending (where the culms are bent across their thickness). Irrespective of the bending direction, the strain across the cross-section of the laminated bamboo beam is shown to be linear throughout the test process, following standard beam theory, Based on this theory and the proposed simplified strain-stress relationship for the beam, calculation approaches for the ultimate bending moment and ultimate bending deflection are proposed for three bending failure modes which give a good agreement with the test results. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.