桥梁全寿命设计方法框架性研究

分析了目前桥梁设计方法存在的问题,在寿命周期成本分析的基础上,提出了一种新的基于桥梁性能的桥梁全寿命设计方法和思路,即在满足桥梁服务水平的前提下,以桥梁寿命周期成本最小为优化目标对设计方案进行评估。研究了桥梁寿命周期成本的组成,并以此建立混合寿命周期成本优化模型,通过优化分析,得到最优的桥梁设计方案。通过算例研究,验证了该方法的有效性。该方法的实现不仅能保证桥梁提供长期稳定的服务水平,而且能起到控制长期投资、减小对社会不利影响的目的。

Framework Research on Design Method for Bridge Life Cycle

The main problems of existing bridge design method are analyzed in this paper.On the basis of life cycle cost analysis method,a new bridge life cycle design method is proposed,which evaluates design strategies by minimizing life cycle cost under satisfying lifetime serviceability of bridges.The optimal strategy is decided by constructing cost optimization model of hybrid life cycle based on constitutes of life cycle cost.Flowchart and approach of lifetime design method are developed,and its effectiveness is demonstrated by a numerical example.This method has potential to ensure bridge long-term serviceability,and control long-term investments and decrease adverse impacts on society.