增强木梁受弯性能数值计算

Numerical Calculation of Bending Performance of Reinforced Timber Beams

采用极限状态设计法对增强木梁受弯性能进行预测,仅能得到木梁的极限受弯承载力。为了实现对增强木梁受弯时挠曲行为的全过程预测,本文基于有限条带法计算增强木梁横截面的弯矩-曲率关系,利用有限积分计算梁的挠度,考虑增强材料对木材极限拉应变的增强效应。同时,对采用不同材料和不同方式增强木梁的受弯性能试验进行了数值计算模拟。结果表明:荷载-跨中挠度计算曲线与试验曲线吻合良好,验证了数值计算结果的可靠性。分析了增强材料类型和配置率(增强材料与木梁横截面面积比)等关键参数对增强木梁受弯性能的影响规律。本研究将为增强木梁弯曲行为预测提供一种有效数值计算方法,同时也适用于未增强木梁。

Using limit state design method to predict the bending performance of reinforced timber beams can only obtain the ultimate bending capacity of the beams.In order to capture the entire process of load-deflection behavior of the reinforced timber beams,the moment-curvature relationship curve of the cross-section of the reinforced timber beams was calculated based on the finite strip method,and the beam deflection was calculated using finite integration.The enhancement effect of reinforcing materials on the ultimate tensile strain of timber was considered.Numerical simulations of flexural performance experiments with different materials and different ways of reinforcing timber beams were carried out.The results showed that the calculated load-span deflection curves were in good agreement with the experimental curves,verifying the reliability of the numerical calculation results.The influence of several key parameters including type of reinforcement and configuration ratio(reinforcement to beam cross-sectional area ratio),on the flexural performance of the reinforced timber beams was analyzed.This study provided an effective numerical calculation method for predicting the bending behavior of reinforced timber beams,which was also applicable to the unreinforced timber beams.