重组竹压弯构件承载力非弹性分析方法

Inelastic method for analyzing load-carrying capacity of parallel strand bamboo compressive-bending members

重组竹是一种类似于木材的定向复合材料,其顺纹受压应力-应变非线性特征显著,故重组竹受弯构件和压弯构件在承载能力极限状态下亦呈明显的非线性特征。而现行相关设计规范仍采用线弹性计算方法,不能准确预估压弯构件的承载力。为此,将重组竹受弯构件和偏心受压构件统一为压弯构件,基于Euler梁理论,考虑材料的非线性应力-应变关系,建立了压弯构件在非弹性工作状态下的承载力计算方法。通过重组竹梁受弯试验和重组竹柱偏心受压试验,验证了所提方法的准确性。

Parallel strand bamboo （PSB） is a wood-like oriented composite, of which the stress-strain relationship exhibits pronounced nonlinearity. The failure of the PSB bending and compressive-bending members presents nonlinear progressive process under the ultimate state. However, current correlative design specifications are all based on the linear elastic theory, which cannot accurately estimate the load-carrying capacity of members. In this study, the PSB beams and columns with eccentrically compressive loading are generally treated as PSB compressive-bending members. With considering the nonlinear stress-strain relationships of PSB composites, the inelastic method to calculate the load- carrying capacity of PSB compressive-bending members under ultimate state was established based on Euler beam theory. Eventually, the method proposed in this paper was validated through the bending experiments of PSB beams and PSB columns under eccentrically compressive loading.