受损木梁的抗弯加固试验与承载力计算分析

发布时间：2018-06-16 08:15

本文选题：受损木梁 + 抗弯性能　；参考：《应用数学和力学》2014年S1期

【摘要】：针对雅安地震中大量受损的木结构,统计了木梁的主要损伤情况,研究了受损木梁的抗弯加固试验,分析了裂缝和木结对梁和加固梁在受弯过程中的载荷、位移的影响,建立了加固木梁的极限承载力与梁参数、裂缝形式与分布,以及CFRP(carbon fiber reinforced polymer)加固率影响的理论计算公式。试验结果表明:抗弯加固木梁的整个变形过程符合平截面假定,碳纤维布能有效提高梁极限承载力,提高幅度可达到25.2%;受木结和初始裂缝的影响,随着CFRP加固层数的增加,其承载力提高幅度反而下降;裂缝和木结对木梁极限承载力影响很大,是木梁破坏的主要原因,新裂缝的萌生点位于木节处,木梁破坏的主要位置为木结处。同时,基于最大有效应力建立的木梁承载力计算模型,计算值与试验值符合较好,其误差在8%以内,符合工程计算要求。
[Abstract]:In view of the large number of damaged wooden structures in the Ya'an earthquake, the main damage conditions of the wood beams are counted, the flexural strengthening tests of the damaged wood beams are studied, and the effects of the loads and displacements of the cracks and wood pair beams and the strengthened beams on the bending process are analyzed. The theoretical formulas for calculating the ultimate bearing capacity and beam parameters, crack form and distribution, and the effect of CFRP fiber reinforced polymer) reinforcement rate on the strengthened wood beams are established. The experimental results show that the whole deformation process of the flexural strengthened wood beam accords with the assumption of plane section, the ultimate bearing capacity of the beam can be effectively increased by carbon fiber sheet, and the increase can reach 25.2.The effect of the wood joint and initial crack, with the increase of the number of CFRP reinforcement layers, The ultimate bearing capacity of wood beams is greatly affected by cracks and wood joints, which is the main reason for the failure of wood beams. The initiation point of new cracks is located at the joints, and the main position of the destruction of wood beams is at the joint. At the same time, the calculation model of the bearing capacity of wood beam based on the maximum effective stress is in good agreement with the experimental value, and the error is less than 8%, which accords with the requirement of engineering calculation.
【作者单位】：四川大学建筑与环境学院;四川大学破坏力学与工程防灾减灾四川省重点实验室;
【基金】：中国博士后科学基金(2014T70870) 国家自然科学基金(51408382)~~
【分类号】：TU366.2

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