高性能竹基复材加固木梁的协同工作性能研究  

Experimental study on cooperative work performance of wooden beams strengthened with high-performance bamboo-based composites

作　　者：周长东[1,2] 王玉虔 郑玉槟 Zhou Changdong;Wang Yuqian;Zheng Yubin(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]北京交通大学结构风工程与城市风环境北京市重点实验室,北京100044

出　　处：《土木工程学报》2025年第1期35-46,共12页China Civil Engineering Journal

基　　金：国家自然科学基金(52078030,51678039)。

摘　　要：竹钢是一种高性能竹基复合材料和重组竹制品,具有可以和钢材媲美的拉、压、弯曲强度。用钢带(无损)或钢带加少量钢钉(微损)锚固竹钢板材加固古建筑木梁,可以实现对古建筑木梁的无损/微损和可逆加固。为了研究不同加固方法和竹钢板厚度等因素对木梁协同工作性能的影响,该文对10根木梁进行了弯曲加载试验,对试件的受力过程、破坏形态、初始抗弯刚度及变形能力进行了比较和分析。研究结果表明:竹钢板与木梁可以协同工作,加固后木梁的抗弯承载力、刚度均显著提升,抗弯承载力的提高幅度为47.94%~139.74%,刚度的提高幅度为4%~128%;其中全包加固试件加固效果最佳;拉压复合加固和全包加固试件破坏后的残余抗弯承载能力可达未加固木梁极限抗弯承载力的74%~138%,说明采用这两种加固方式对有缺陷木梁进行加固可以弥补木材初始缺陷的不足。建立了竹钢板加固木梁的抗弯承载力计算公式,理论计算与试验结果吻合良好。Bamboo Steel is a kind of high-performance bamboo-based composite and bamboo scrimber product with tensile,compressive and bending strengthen comparable to steel.The timber beams in ancient building can be strengthened by steel belts(nondestructive)or steel belts together with Bamboo Steel anchored by a small number of steel nails(micro-damage),so the non-destructive or micro-damaged strengthening and reversible retrofit of ancient timber beams can be realized.To study the influences of different strengthening methods and the thickness of Bamboo Steel plates on the cooperative work performance of timber beams,the bending tests on ten timber beams were carried out,and the influences of strengthening method,reinforcement amount in tensile/compression zone,and the number of nails on the reinforcement effect were studied.The strengthening effects were compared and analyzed in terms of failure mode,bearing capacity and stiffness of specimens.The test results show that Bamboo Steel plates and timber beams can work cooperatively,and the flexural-load bearing capacity and stiffness of the strengthened timber beams are significantly improved,with the flexural-load bearing capacity increasing from 47.94%to 139.74%and the stiffness increasing from 4%to 128%,and the strengthening effect of specimens with completely-covered strengthening shall be the best.After their failures,the residual bearing capacity of specimens with the tension-compression composite strengthening and completely covered strengthening may even reach 74%-138%of the ultimate bearing capacity of the unreinforced timber beam,indicating that the two reinforcement methods can compensate the deficiency caused by the initial defects of wood.The calculation formula for the flexural-load bearing capacity of timber beams strengthened with Bamboo Steel plates was proposed,and the results of theoretical calculation agree well with the experimental results.

关 键 词：木梁 高性能竹基复材 可逆加固 协同工作 抗弯性能 

分 类 号：TU366[建筑科学—结构工程]