Experimental study on cooperative work performance of wooden beams strengthened with high-performance bamboo-based composites
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(non-destructive)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.
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