工程竹结构设计非弹性方法综述

Overview on inelastic design method of engineered bamboo structures

工程竹顺纹受压极限状态存在显著的非弹性响应,采用线弹性理论计算工程竹受弯与偏心受压构件强度会导致其极限承载力被严重低估。因此,工程竹顺纹应力-应变关系的非弹性特点对工程竹构件的极限承载力与变形影响不可忽略。系统总结了工程竹基本力学性能、工程竹受弯构件和压弯构件非弹性分析等方面的研究成果,列出了受弯构件和压弯构件极限承载力计算的主要公式。不同于现行规范中的强度校核公式,公式考虑了材料受压非线性,可用于计算构件极限承载力,为进一步给出受弯构件、压弯构件承载力实用计算公式提供了依据。

Engineered bamboo exhibits pronounced inelastic response once the material undergoes its compressive ultimate state,so using linear elastic theory to calculate the strength of bending and eccentric compression engineered bamboo members causes its ultimate bearing capacity to be seriously underestimated.Therefore,the inelastic characteristics of the stress-strain relationship along the grain of the engineered bamboo cannot be ignored on the ultimate bearing capacity and deformation of the engineered bamboo members.The basic mechanical properties of engineered bamboo,the inelastic analysis of engineered bending bamboo bending members and compression-bending members were systematically summarized,and the main formulas for calculating the ultimate bearing capacity of bending members and compressionbending members were listed.Different from the strength check formula in the current code,the formula takes into account the nonlinearity of the material under compression and could be used to calculate the ultimate bearing capacity of members,providing a basis for further giving practical calculation formulas for the bearing capacity of bending members and bendingcompression members.