traffic discharge meaning in English

交通量

With the rise on the highway and railway of traffic discharge ^ the raising of vehicle vociety and the growth of wheel load , a higher demand was presented on intensity , rigidity and durability of the existing bridges , and so forth
随着公路和铁路交通流量的增加、车速的提高、车辆轮载的增大，于是对沿线的桥梁在强度、刚度、耐久性等诸多方面提出了更高的要求。
In our country , most of bridges were built in 1960s or 1970s , which were based on that time traffic discharge and development planning , so design criterion of these bridges were very lower . in addition , it was inevitable to bring about cracks > concrete rupture , steel rust ^ honeycomb and water proof layer failure , because some established bridges were built by poor construction and maintenance during the course of operating period . all above mentioned lead to durability and bearing capacity could n ' t gain to design standard
由于我国很多桥梁建于上个世纪六、七十年代，基于当时的车流量和各方面的发展规划，桥梁设计等级普遍偏低；另外，某些既有桥梁由于施工质量差和运营期间维护不到位，不可避免地会产生裂缝、混凝土破损、钢筋锈蚀、蜂窝及防水层失效等缺陷，从而导致耐久性及承载力达不到设计要求。