弯桥直做对20mT形主梁的内力影响

The Internal Force Influence on the 20 m T-beams of the Straight Fabrication of Curved Bridge

以20 m T梁为对象,使用MIDAS建立直桥与弯桥模型,通过进行对比分析。研究弯桥直做法主梁的内力和相同跨径直桥主梁内力之间的差异。结果表明对二级公路中设计速度为60 km/h平曲线半径介于125 m和200 m之间的弯桥直做法的简支梁桥设计中,控制应力可在等跨径直桥的相应设计值基础上增大12%。

Through analysis of models of straight bridge and curved bridge,research on the difference of the internal force on the T-beams between the straight fabrication of curved bridge and the straight bridge of same span.The conclusions are as below：in the design of simple supported beam bridge,in the second-class highway with the design speed of 60 km/h,and the plane curve radius between 125 m and 200 m,control force can be 12% more than the design value of the straight bridge with same span.