摘要
既有钢结构建筑受损待修复期间,钢材受静态应变时效影响,其材料性能发生显著变化,致使受损钢结构修复后整体受力性能改变。为研究静态应变时效对受损钢梁受弯力学性能的影响,设计了3根Q355B热轧H型钢梁,通过两阶段加载试验方法完成受损钢梁应变时效影响试验研究,并基于试验结果建立ABAQUS有限元分析模型。通过二次模型导入和材性重定义,实现钢材经应变时效影响前后的不同材料属性建模,完成受损钢梁应变时效影响的有限元模型建立及参数分析。研究结果表明:受损钢梁的受力性能由残余变形和钢材力学性能变化两者共同决定,当钢梁发生损伤程度较小时,钢材力学性能变化不显著,钢梁因残余变形而极限承载力降低;当钢梁损伤变形导致部分截面应变达到4.5%及以上时,不再适合修复后继续使用。
During the period of waiting for repair in a damaged steel structure building,the material properties of the steel are significantly affected by static strain aging,resulting in a change in the overall mechanical properties of the repaired steel structure after restoration.In order to study the effect of strain aging on the mechanical properties of steel beams,three Q355B hot-rolled H-shaped steel beams were designed,and the strain aging effect of damaged steel beams was studied by two-stage loading test method.Based on the test results,the ABAQUS finite element model was established to analyze the mechanical properties of the damaged steel beams after strain aging.An ABAQUS finite element analysis model was established by importing a secondary model and redefining material properties to model the different material properties of the steel before and after strain aging,and subsequently,the finite element model of the damaged steel beam affected by strain aging was established and the parametric analysis was carried out.The results show that the mechanical properties of the damaged steel beam are determined by the residual deformation and the mechanical properties of the steel.When the damage degree of the steel beam is small,the mechanical properties of the steel beam do not change significantly,and the ultimate bearing capacity of the steel beam decreases due to the residual deformation.When the strain of part section reaches 4.5%or above due to the damage and deformation of steel beam,it is no longer suitable for further use after repair.
作者
王之瀚
张宝军
杨怡亭
王燕
李珂皓
Zhihan Wang;Baojun Zhang;Yiting Yang;Yan Wang;Kehao Li(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)
出处
《钢结构（中英文）》
2024年第8期1-10,共10页
Steel Construction（Chinese & English）
基金
国家自然科学基金(青年)项目(51908306)。
关键词
热轧H型钢梁
应变时效
部分损伤
抗弯性能
hot-rolled H-shaped steel beam
strain aging
partially damaged
flexural behavior
