在公路桥设计中需要明确的几个问题

Problems that must be Solved before Designing Highway Bridges

为使公路桥设计更能适应发展趋势，通过参考英、美两本新桥规，提出所需明确的６个问题：①常规和特殊活荷载；②分线加载；③常规活荷载的表达；④多线加载的折减；⑤常规和特殊活荷载的共同加载；⑥极限状态法中的荷载系数。供工程界探讨和改进。

For improving our highway bridge design,the authors refer to two new specifications from UK and USA,and raise 6 problems for discussion:1.Normal and special traffic live loading;2.Loading by lanes;3.Expressions for normal live loading;4.Reduction for multiple presense;5.Coincident loading of normal and special live loading;6.Loading factors in the limit state method.Such a discussion will be beneficial for our bridge engineering.