设备更新率
设备更新率-
通过类比设备更新收益率，定义桥梁结构的维修收益率，提出了经济指标的计算公式，建立了考虑多种性能的桥梁复合寿命的分析方法。
According to the equipment renewing profit rate , the bridge structure maintenance profit rate is defined by analogy , and a formula of economy index is proposed . Then the analysis method for bridge composite life considering various performances is built .