粘贴钢板加固裂损木梁受力性能试验研究

Experimental study on mechanical performance of longitudinal cracked wooden beams retrofitted with bonded steel plates

纵向干缩裂缝是既有木梁中常见裂缝,对木梁受力性能影响较大.本文在综合比较多种加固方法后,拟采用粘贴钢板方法对严重裂损木梁进行补强加固.结合3个采用不同厚度钢板加固裂损木梁试件和1个未加固对比试件的试验研究,对粘贴钢板加固裂损木梁的传力机理和破坏形态进行了分析.试验研究结果表明,采用粘贴钢板加固技术能有效阻止既有纵向裂缝开展、有效提高裂损木梁承载能力和刚度,适合于裂损严重且不易更换的既有裂损木梁的补强加固.进一步结合试验结果,初步建立了粘贴钢板加固裂损木梁的承载能力计算方法.

The longitudinal shrinkage cracks are very common in beams of existing wooden structures building,and these longitudinal cracks play important roles on the mechanical performance and always lead to failure or collapse.With comparison of several retrofitted methods studied before,a retrofitted method with bonded steel plates was introduced to strengthen the wooden beams severely cracked.Based on experimental results of three bonded steel plates retrofitted wooded beam specimens and one control specimen unretrofitted,the failure pattern and failure mechanics of retrofitted specimens were studied.Seen from the experimental results,it was denoted that the steel plates method could effectively postpone and stop the longitudinal cracks,and the bending capacity as well as the flexure rigidity of the wooden beams were substantial improved,therefore the steel plates method was suitable for retrofitting the wooden beams that severely cracked and hard to be replaced.Furthermore,based on the experimental results,the calculation method of bending capacity of retrofitted beams were derived and proposed.