预应力筋应力腐蚀后预应力混凝土梁受力性能研究  

Mechanical behaviors of prestressed concrete beams after stress corrosion of prestressed reinforcement

作　　者：李琮琦[1,2] 葛文杰[1,3] 曹大富[1] 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]江苏大学土木工程与力学学院,江苏镇江212013 [3]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《南京理工大学学报》2014年第6期811-817,共7页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(50978224;51278230;51308490);住房和城乡建设部科学技术计划项目(2013-K4-17);江苏省自然科学基金(BK20130450);江苏省高校自然科学基金(13KJB560015);江苏省2012年度普通高校研究生科研创新计划项目(CXZZ12_0655);东南大学混凝土及预应力混凝土结构教育部重点实验室开放基金;扬州市科技计划项目(2012149)

摘　　要：为研究预应力筋应力腐蚀对预应力混凝土梁承载力和耐久性的影响,设计制作了7根用人工坑蚀模拟预应力筋受应力腐蚀的预应力混凝土梁,进行静力受力性能试验。试验结果表明:预应力筋坑蚀后的预应力混凝土梁的开裂荷载、极限荷载低于普通预应力混凝土梁,并随坑蚀深度的增大而下降;增大预应力度可提高应力腐蚀预应力筋混凝土梁的开裂荷载;增大非预应力钢筋的配筋率可提高预应力混凝土梁的开裂荷载、极限荷载;随着坑蚀的增大,构件抗弯刚度迅速下降;提高预应力度可减缓构件抗弯刚度的下降,而增大非预应力钢筋的配筋率对抗弯刚度的影响则较小。根据该文预应力筋坑蚀后的预应力混凝土梁极限承载力计算公式得到的理论值与实测值相吻合,可供工程实践参考。In order to study the influences of stress corrosion of prestressed reinforcement on the bearing capacity and durability of prestressed concrete beams,7 prestressed concrete beams undergone simulated stress corrosion,i. e. pit corrosion,are tested by static flexural experiments. The experimental results show that the cracking load and ultimate load of prestressed concrete beams after stress corrosion of prestressed reinforcement are less than those of normal prestressed concrete beams and decrease with the increase of corrosion depth. Cracking load increases with the increase of prestress degree. Cracking load and ultimate load increase with the increase of non-prestressed reinforcement ratio. Stiffness decreases rapidly with the increase of corrosion depth. The decrease of the stiffness is slow down with the increase of prestress degree while non-prestressed reinforcement ratio has no obvious influence. The ultimate load calculation formulae of prestressed concrete beams after stress corrosion of prestressed reinforcement is given,and verified by experimental value,which can be used in practical engineering.

关 键 词：预应力筋 应力腐蚀 混凝土梁 人工坑蚀 静力 开裂荷载 极限荷载 抗弯刚度 

分 类 号：TU375.1[建筑科学—结构工程]