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基于超期服役钢结构厂房现场检测数据,研究了锈蚀对非对称截面钢格构柱受力性能的影响。根据PKPM软件弹性阶段内力计算结果,运用ABAQUS软件对考虑不同锈蚀深度的钢格构柱按三种锈蚀方式进行非线性数值分析,探究其承载力的衰减规律。根据锈蚀破坏形态、极限荷载-锈蚀深度(P_u-D)和锈蚀荷载-轴向位移(P-s)曲线可知,随锈蚀深度D的增加,P_u-D曲线出现分界点,破坏形态发生改变,当腹板参与锈蚀,且锈蚀深度D≥4mm时钢格构柱发生有脆性特征的破坏;与翼缘锈蚀相比,在构件屈曲中起支撑作用的腹板锈蚀对钢格构柱危害更大;翼缘单面锈蚀深度D≤3mm、腹板锈蚀深度D≤1mm时,钢格构柱极限荷载、塑性性能均有所提高和改善;最后提出临界锈蚀深度概念,可用于结构状态监测和维修加固。
Based on the on-site inspection data of over-service steel structure workshop, the influence of corrosion on the stress behavior of asymmetric steel lattice columns was studied. According to the calculation results of the internal force of PKPM during the elastic phase, ABAQUS software was used to analyze the attenuation of the bearing capacity of steel lattice columns with different corrosion depths by three numerical methods. According to the curve of corrosion failure mode, ultimate load-corrosion depth (P_u-D) and corrosion load-axial displacement (Ps), the demarcation point of P_u-D curve changes with the increase of corrosion depth D, Plate involved in corrosion, and corrosion depth of D ≥ 4mm brittle fracture characteristics of steel columns; compared with the flange corrosion, the buckling in the component of the web rust plays a more damaging role on the steel lattice column; wing When the depth of single-sided corrosion is less than or equal to 3mm and the depth of corrosion of web is less than or equal to 1mm, the ultimate load and plasticity of the steel lattice columns are improved and improved. Finally, the concept of critical depth of corrosion is put forward, which can be used for structural condition monitoring and maintenance and reinforcement.