百年混凝土桥梁方形带肋钢筋力学性能研究  

Study on Mechanical Properties of Square Ribbed Steel Bars in a Century-old Concrete Bridge

作　　者：翟慕赛 刘可凡 陶怡然 陈建兵[1] ZHAI Musai;LIU Kefan;TAO Yiran;CHEN Jianbing(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215009

出　　处：《材料导报》2025年第5期170-175,共6页Materials Reports

基　　金：国家自然科学基金(51908395);江苏省自然科学基金(BK20190945);江苏省高等学校自然科学研究面上项目(19KJB580004);江苏省结构工程重点实验室开放课题(ZD1804);苏州市科技计划(基础研究)项目(SJC2023002)。

摘　　要：为研究混凝土桥梁方形带肋钢筋的基本力学性能,针对从苏州市某百年混凝土桥梁获取的26根方形带肋钢筋,利用宏微观形态分析、化学成分测定、静力拉伸试验等方法开展了方形带肋钢筋表观特征、元素含量、力学性能等分析。结果表明百年混凝土桥梁方形带肋钢筋表观特征部分满足现行规范要求。钢筋基体组织主要由铁素体与珠光体构成,同时存在一定的硫化物、硅酸盐等夹杂物,其中硅酸盐夹杂物含量显著高于现代钢筋;含碳量低于0.25%,属于低碳钢,化学元素Si与Mn含量满足现行规范要求,S与P含量高于现行规范的最高限值。钢筋屈服强度、极限强度、断裂伸长率、弹性模量、强屈比的平均值分别为276.40 MPa、413.43 MPa、35.49%、1.92×10^(5) MPa、1.49;弹性模量略低于现代桥梁用钢筋的弹性模量,强屈比、断裂伸长率均满足现行规范对桥梁用钢筋的要求。本工作的成果为同时期混凝土桥梁和历史建筑提供基本力学参数,对同类型混凝土建筑物的维护与加固具有工程意义。To study the basic mechanical properties of square ribbed steel bars in concrete bridges,26 pieces of the square ribbed steel bar samples were acquired from a century-old concrete bridge in Suzhou city,and analyses on surface characteristics,element content,mechanical properties of the samples was carried out by means of macro-and micro-morphology observation,chemical composition measurement,and static tensile test.The results showed that the surface characteristics of square ribbed steel bars in the century-old concrete bridge partly meet the cur-rent standard specifications.The microstructure of the steel bars consisted mainly of ferrites and pearlites,with a certain amount of inclusions such as sulfides and silicates in which the content of the latter was significantly higher than that in modern steel bars.The carbon content was less than 0.25%,indicating that the square ribbed steel bars were made of low-carbon steel.The contents of Si and Mn elements met the current standard specifications,while the contents of S and P were higher than the upper acceptable limits in the current standard.The century-old steel bars were measured to have yield strength,ultimate tensile strength,percentage elongation after fracture,elastic modulus,and strength-to-yield ratio(all were average values)of 276.40 MPa,413.43 MPa,35.49%,1.92×10^(5) MPa,and 1.49,respectively.The elastic modulus was slight-ly lower than that of the steel bars used in modern bridges,while the strength-to-yield ratio and the percentage elongation after fracture both met the current standard specifications for steel bars in bridges.The output of this work provides basic mechanical parameters for concrete bridges and historical buildings at the same period,which are of a certain engineering importance for the maintenance and reinforcement of similar con-crete structures.

关 键 词：百年混凝土桥梁 方形带肋钢筋 表观特征 力学性能 拉伸试验 

分 类 号：TB31[一般工业技术—材料科学与工程] U446.1[建筑科学—桥梁与隧道工程]