混凝土箱梁结构力学特性分析与安全评价研究  

Mechanical Character Analysis and Safety Evaluation of Box Girder

作　　者：张晓峰[1] 张景飞[2] 刘雪峰[1] 

机构地区：[1]武警水电第二总队第五支队,江苏常州213031 [2]郑州大学力学与工程科学学院,河南郑州450001

出　　处：《施工技术》2013年第12期17-20,共4页Construction Technology

摘　　要：为全面了解预应力箱梁结构的非线性力学性能,基于大型非线性有限元软件MSC.MARC,建立预应力箱梁三维非线性有限元模型,混凝土采用六面体单元,钢筋采用truss杆单元,预应力通过钢筋单元的初始应力输入施加。模拟分析了预应力箱梁在集中荷载作用下的结构力学特性,并通过试验对计算结果进行验证,通过计算与试验结果对既有结构的安全性进行评价。To study the nonlinear mechanical character comprehensively of the prestressed concrete box girder,three-dimensional nonlinear finite element model of the girder was established by software MSC.MARC.The concrete model uses hexahedral 3-D entity unit,reinforced by MARC program dedicated truss modules.Primary pre-stressing values of pre-stressed reinforcements were imposed to the reinforced bar elements.The mechanical properties of the pre-stressed box girder under concentrated loads have been simulated.An experiment with same conditions has been carried to verify the calculation results.The calculated and experimental results were used to evaluate the safety of the existing structure.It provides a reference for the architectural design and analysis of pre-stressed concrete.

关 键 词：混凝土 预应力混凝土箱梁 有限元分析 力学特性 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]