冻融循环作用下锈蚀预应力混凝土梁受弯性能数值分析  

Numerical analysis of flexural performance of corroded prestressed concrete beams under freeze⁃thaw cycles

作　　者：刘志鹏 黄悦 于雯 商怀帅[1] LIU Zhipeng;HUANG Yue;YU Wen;SHANG Huaishuai(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《建筑结构》2024年第16期86-92,共7页Building Structure

基　　金：国家自然科学基金项目(51608135),山东省泰山学者项目(tsqn201909127)。

摘　　要：利用ABAQUS软件建立预应力混凝土梁三维有限元模型,对冻融循环以及锈蚀后的预应力混凝土梁分别进行了受弯性能非线性数值模拟分析和试验研究,模拟分析所得荷载⁃跨中挠度曲线与试验研究所得吻合良好,验证了模拟分析结果的合理性。在此基础上,建立冻融循环与锈蚀共同作用下的预应力混凝土梁有限元模型,分析不同参数下预应力混凝土梁的受弯性能。结果表明,冻融循环与锈蚀共同作用下预应力混凝土梁的抗裂能力与抗弯承载力相对于单一环境作用下明显减小;冻融循环与锈蚀共同作用下预应力混凝土梁出现了两种典型的破坏方式:混凝土压碎与预应力筋拉断;随着混凝土强度降低、冻融循环次数增多、锈蚀率增大,预应力混凝土梁的极限承载力与对应下的跨中极限挠度呈现不同程度衰减趋势;冻融循环次数和预应力水平对构件刚度影响较大。ABAQUS was used to establish a three⁃dimensional finite element model of prestressed concrete beams,and the nonlinear numerical simulation analysis and experimental study of flexural performance of the prestressed concrete beams after freeze⁃thaw cycles and corrosion were carried out respectively.The load⁃midspan deflection curve obtained by simulation analysis is in good agreement with the experimental results,which verifies the rationality of the simulation analysis results.On this basis,a finite element model of prestressed concrete beams under the combined action of freeze⁃thaw cycles and corrosion was established,and the flexural performance of prestressed concrete beams under different parameters was analyzed.The results show that the cracking resistance and flexural bearing capacity of prestressed concrete beams under the combined action of freeze⁃thaw cycles and corrosion are significantly reduced compared with single environmental factors.There are two typical failure modes of prestressed concrete beams under the combined action of freeze⁃thaw cycles and corrosion:concrete crushing and prestressed tendon breaking.As the strength of concrete decreases,the number of freeze⁃thaw cycles increases,and the corrosion rate increases,the ultimate bearing capacity of prestressed concrete beams and the corresponding midspan ultimate deflection show different degrees of attenuation trends;the number of freeze⁃thaw cycles and the prestress level have a greater impact on the stiffness of the member.

关 键 词：预应力混凝土梁 冻融循环 锈蚀 受弯性能 抗裂能力 抗弯承载力 

分 类 号：TU378.2[建筑科学—结构工程]