摘要
借助ANSYS软件对预应力混凝土连续梁弯桥建立三维仿真分析模型,分析了圆心角、预应力、汽车偏载、腹板预应力筋布置形式对剪力滞系数沿纵、横向分布规律的影响。结果表明,预应力的作用可以显著降低各断面的最大剪力滞系数;当弯曲程度变大时,弯桥内圆弧侧剪力滞系数增加,外圆弧侧剪力滞系数减小;汽车偏心加载于外圆弧侧时,会显著增加弯扭耦合效应;改变弯桥腹板预应力筋的横向布置形式,使外侧腹板处预应力筋的纵向弯曲程度大于内侧,会使同一断面内的剪力滞系数在横桥向变得更加不均匀。
Establishing a 3-D simulation model by means of ANSYS software,the effect of central angle,prestress,bias load,distribution form of tendons in the web on the longitudinal and transverse distribution pattern of shear lag coefficients were analysed.The results indicated that the prestressing can reduce the maximum shear lag coefficient of every section significantly;when the angle increases,shear lag coefficients near the inner side increase,while the outer ones decrease;outer-biased vehicle loading can increase the bending-torsion coupling significantly;when the transverse distribution form of tendons in the web is changed to make the outer tendons more curved longitudinally than the inner ones,the shear lag coefficients in the same section will become more uneven transversely.
出处
《结构工程师》
2010年第6期49-53,共5页
Structural Engineers
关键词
预应力混凝土
剪力滞
弯扭耦合
汽车偏载
圆心角
prestressed concrete
shear lag
curved bridge
bending-torsion coupling
bias load
central angle
