考虑横截面塑性区域扩展的竹木复合夹芯梁弯曲变形的理论研究

简述了竹木复合梁的研究现状，研究了竹木复合夹芯梁弯曲变形的破坏过程，运用理想弹塑性材料应力演化规律将横截面塑性区域的扩展过程分成了4个阶段，以平面假设为基础建立了竹木复合夹芯梁强度预测的理论模型。并通过对实例的计算，分析了夹芯梁弯曲变形过程中不同时刻横截面的弯矩与最大应力之间的关系。以此模型为基础计算的3点弯曲夹芯梁各阶段的跨中挠度理论值与试验结果具有较好的一致性，最大误差不超过6％。图3表2参11

Bending deformation of bamboo-wood sandwich beam based on the plastic area extension across the cross section

Bamboo-wood composites have been studied widely and deeply, especially in the effects of technological conditions on the mechanical properties. The bamboo-wood sandwich beams are often damaged by bending. With the application of the stress evolution regularity on the perfect elasto-plastie material extension, the plastic areas across the cross section are divided into four steps. And a calculation model of predicting the bending behaviors is presented based on the plane hypothesize. The relations of the theoretic moment and the instantaneous maximum stress across the cross section are analyzed though a ease. The theoretical deflections in four stages based on the obtained solution agree well with the available results from experiments, the maximum difference less than 6%. It indicates that the calculation model is effective to predict the ultimate strength and bending deformation, and important to optimize design for structure. [ Ch, 3 fig. 2 tab. 11 ref.]