既有预应力混凝土梁桥现存预应力影响参数分析  

Existing Prestressing Influence Parameters Analysis of Existing Prestressed Concrete Beam Bridge

作　　者：黄颖[1] 许永吉 HUANG Ying;XU Yongi(Fujian Chuanzheng Communications Collge,Fuzhou 350007,China;Fujian Province Transpotation Construction Engineering Test Co.,Ltd.,Fuzhou 350007,China)

机构地区：[1]福建船政交通职业学院,福州350007 [2]福建省交通建设工程试验检测有限公司,福州350008

出　　处：《四川轻化工大学学报（自然科学版）》2020年第6期83-90,共8页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：福建省教育厅应用技术协同创新中心项目(闽教科[2018]105号);福建省交通厅科质项目(202033)。

摘　　要：建立预应力混凝土简支梁有限元模型两阶段分析方法,利用粘结滑移单元(3个非线性弹簧单元)模拟预应力筋单元和混凝土单元间的关系,通过调整弹簧单元刚度来模拟预应力筋和混凝土间的粘结性能,以此实现预应力筋从无粘结到有粘结的转换。基于该精细化有限元模型,研究了在梁体外加荷载、预应力大小、预应力筋布置线型(包括分段布筋和连续布筋)、预应力筋布置位置(包括竖向偏心距和水平偏心距)、混凝土强度等各参数变化的情况下伴随预应力损失的梁体响应,通过分析响应规律明确各参数指标的影响程度,为预应力混凝土结构设计提供参考。A two-stage analysis method for the finite element model of prestressed concrete simple beam is established.The bond-slip element(three nonlinear spring elements)is used to simulate the relationship between the prestressed reinforcement element and the concrete element,and the stiffness of the spring element is adjusted to simulate the bond performance between the prestressed reinforcement and the concrete,so as to realize the conversion of the prestressed reinforcement from non-bond to bond.Based on the refined finite element model,the response of the beam with prestress loss is studied under the condition of the external load of the beam,the size of the prestress,the layout line of the prestressed reinforcement(including sectional reinforcement and continuous reinforcement),the layout position of the prestressed reinforcement(including the vertical and horizontal eccentricities),the concrete strength and other parameters.The influence degree of each parameter index is clear through the analysis of the response law,which provides a reference for the design of prestressed concrete structure.

关 键 词：既有预应力 有限元 参数分析 线型布置 偏心距 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]