摘要
为研究预应力混凝土框架桥的力学性能,建立普通混凝土框架桥和预应力框架桥的数值模型,利用数值模拟方法得出两种结构的内力、应力及变形情况,最后对比分析两种结构的受力计算结果。计算结果表明:相较于普通框架桥,预应力框架桥顶板和底板的弯矩及变形均较小,施加预应力后,结构顶板挠度明显降低,挠度从原来的8.1 mm降低为5.7 mm,顶板和底板跨中弯矩值分别减少39.8%、29.8%;预应力框架桥顶板与底板拉应力最大值分别为0.47 MPa、0.41 MPa,故施加预应力可以减小顶板和底板的拉应力,增大结构顶底板的抗裂能力;通过施加预应力还可以进一步减小结构顶底板厚度,以减小结构自重。
In order to study the mechanical properties of prestressed frame bridge,taking the ordinary concrete frame bridge as comparison,the internal force,stress and deformation conditions of two kinds of structure were calculated.Mechanical properties of prestressed frame bridges were obtained by comparing the calculation results of the two structures.Compared with the original frame bridge,the bending moment and deformation of the prestressed frame bridge roof and floor are smaller,and the deflection of the prestressed frame bridge roof is significantly reduced from 8.1 mm to 5.7 mm after applying prestress.The mid-span bending moment of the roof and floor are reduced by 39.8%and 29.8%respectively.The maximum tensile stress of roof and floor of prestressed frame bridge are 0.47 MPa and 0.41 MPa respectively.Applying prestress can reduce the tensile stress of roof and floor and increase the crack resistance of roof and floor of structure.By applying prestress,the thickness of roof and floor of the structure can be further reduced to reduce the weight of the structure.
作者
王建省
陈晓强
黄逸龙
Wang Jianxing;Chen Xiaoqiang;Huang Yilong(College of Civil Engineering,North China University of Technology,Beijing 100144,China)
出处
《铁道勘察》
2021年第3期112-116,共5页
Railway Investigation and Surveying
基金
国家自然科学基金项目(51478004,11572001)
北京市大学生科研训练项目(216051360020XN190)。
关键词
预应力混凝土
框架桥
力学性能
数值分析
结构计算
prestressed concrete
frame bridge
mechanical properties
numerical analysis
structural calculation
