预应力钢-竹组合工字形梁受弯性能有限元分析  

Finite Element Analysis of Bending Properties of Prestressed Steel-Bamboo Combined I-Beams

作　　者：王会芳 茅鸣 张振文[1] 童科挺 李玉顺 WANG Huifang;MAO Ming;ZHANG Zhenwen;TONG Keting;LI Yushun(School of Civil Engineering and Geography and Environment,Ningbo University,Ningbo 315211,China;School of Civil Engineering,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211 [2]青岛农业大学建筑工程学院,山东青岛266109

出　　处：《工业建筑》2024年第4期126-133,共8页Industrial Construction

基　　金：国家自然科学基金项目(52278264,51978345)。

摘　　要：采用有限元软件ABAQUS对预应力钢-竹组合工字形梁的受弯性能进行了三维非线性有限元分析,模型中考虑了重组竹的各向异性和屈服准则,引入内聚力单元模拟了钢-竹界面的黏结滑移,并将模拟结果与试验结果进行了对比,探讨了预应力大小对组合梁受弯性能的影响规律。结果表明:模拟与试验中,预应力钢-竹组合工字形梁的破坏特征及荷载-挠度曲线基本一致,容许承载力及最大跨中挠度吻合较好;配置预应力筋可提高组合梁的刚度,但随着预应力值的增大,组合梁刚度无明显变化,而极限承载力及变形能力提高,钢-竹界面胶层破坏情况延缓,当预应力过大时会导致组合梁钢-竹界面过早脱胶、极限承载力降低,为了满足承载能力和变形性能的要求,建议预应力施加值为普通钢-竹组合工字形梁的容许承载力值。The three-dimensional nonlinear finite element analysis of the bending properties of prestressed steel-bamboo composite I-beams was carried out by using the finite element software ABAQUS,the anisotropy and yield criterion of recombinant bamboo were considered in the model,the cohesion element was introduced to simulate the bonding slip of the steel-bamboo interface,and the simulation results were compared with the test results,and the influence of prestress on the bending properties of the composite beam was discussed.The results showed that the failure characteristics,the load-deflection curves,the allowable load and the maximum mid-span deflection of the prestressed steel-bamboo composite beams in the test and simulation were consistent.The configuration of prestressed ribs could improve the stiffness of the composite beam,but with the increase of the prestress value,the stiffness of the composite beam did not change significantly,the ultimate bearing capacity and deformability were improved,and the failure of the glue layer at the steel-bamboo interface was delayed.When the prestress was too large,it would lead to premature degumming of the steel-bamboo interface of the composite beam and the reduction in the ultimate bearing capacity.In order to meet the requirements of bearing capacity and deformation performance,it was recommended that the prestress application value should be the allowable bearing capacity value of ordinary steel-bamboo composite I-beams.

关 键 词：预应力钢-竹组合工字形梁 受弯性能 有限元分析 各向异性 内聚力单元 

分 类 号：TU398.6[建筑科学—结构工程]