整体式板桥横向内力的计算分析

Calculation and analysis of the monolithic slab transverse internal force

整体式板在荷载作用下,除产生纵向弯曲外,也会产生横向弯曲,当桥面板宽跨比较大时,除计算纵向弯矩外,尚需计算横向弯矩。文章应用ANSYS有限元软件建立力学模型,给出了在汽车荷载作用下纵、横向弯矩的计算结果;提出工程设计中常用的解析法计算横向弯矩的方法,计算结果满足设计要求。计算表明,桥梁宽跨比越大,最大横向弯矩与最大纵向弯矩之比越大,因此设计时应对横向弯矩的计算予以充分重视,否则会由于横向分布钢筋配置不足,导致桥梁产生纵向裂缝。

The integral plate under the action of load,in addition to produce longitudinal bending,also can produce transverse bending,when wide span ratio of bridge panel is bigger,in addition to calculate the longitudinal bending moment,still need to calculate lateral bending moment. This paper uses ANSYS finite element software to establish mechanical model,gives the longitudinal and transverse bending moment under vehicle load; Proposed analytical method that commonly used in engineering design to calculate lateral bending moment,the calculation results meet the design requirements. Bridge calculation shows that the bigger the wide span ratio,the greater the ratio of maximum transverse bending moment and the maximum longitudinal bending moment,so the calculation of transverse bending moment should be given full attention at the time of design,otherwise it will due to lack of transverse distribution steel bring about bridge longitudinal cracks.