Multiple V-ring packing, combined with liveloading, maintains packing compression under high-cycle and severe service applications.
多重V形环填料，组合动负载，维护填料压缩，适用于使用频率高，环境严酷的应用场合。
2
Then the vertical load calculation of internal structure, then the earthquake, constant, liveloading income of several combination.
接着计算了竖向荷载作用下的结构内力，然后进行了地震，恒荷，活荷作用所得内力的几种组合。
3
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 liveloading;