Lifecycle Analysis of Traffic Infrastructures using Accelerated Exposures Test Results

本研究在获得钢桥耐久性基础数据的基础上，对钢桥进行了全寿命周期成本分析和全寿命周期环境影响分析，建立了考虑现场环境影响的涂装钢和基础隔震橡胶支座耐久性评估方法。采用A型、B型、C型和I型4种涂装系统对重涂钢试件进行了长期加速暴露试验。为了检查测试数据的有效性，使用从使用70年的钢桥上切下的重新涂漆的钢进行第二系列加速暴露测试。建立了三种涂装体系的耐久性劣化曲线，对桥梁的耐久性进行了评价 关于我们 老化橡胶支座对单钢桥墩地震反应的影响。研究了老化与基础隔震橡胶支座长期性能的关系。然后将橡胶支座隔震钢桥墩模型化为两自由度体系，通过动力分析计算了结构的响应和损伤。将橡胶支座更换为老化橡胶支座，并对桥墩的抗震性能进行了评价。对橡胶支座老化的影响进行了比较和讨论。最后，提出了基于钢桥墩长期抗震性能的基础隔震橡胶支座维修策略的确定方法，并对既有桥梁和改造后的桥梁进行了全寿命分析。通过与现有桥梁类型的比较，阐明了考虑劣化的全寿命周期成本和全寿命周期环境影响的特点。这些结果对建立桥梁的全面管理系统具有重要的参考价值。少

In this study the fundamental data of durability of steel bridges were obtained and the lifecycle analysis related to lifecycle cost and lifecycle environmental impact was done using them, The evaluation procedures of the durability of painted steels and base-isolated rubber bearing were established considering the site environment.Firstly the durability of re-painted steels was dealt with using the accelerated exposure test in the S-6 JIS environment. The re-painted steel specimens using four types of painting systems, i.e. A-type, B-type, C-type and I-type were applied to the long-term accelerated exposure test. In order to check the validity of the test data, the second series of accelerated exposure test was performed using the re-painted steels cut from the used steel bridge by 70 years. The deteriorated curves for three types of painting systems were established to evaluate the durability of the bridge.The purpose of third series of test study is to evaluate the influence factors … More of aged rubber bearings on the seismic response of single steel bridge piers. The relationship between ageing and base-isolated rubber bearings' long-term performance is studied. Then the steel bridge piers with base-isolated rubber bearing are modeled as two-degree of freedom systems, and through dynamic analysis the response and damage of the structures are calculated. The rubber bearing is replaced by an aged one and the seismic performance of the pier is evaluated. The influence of rubber bearing's ageing is compared and discussed. Finally, a procedure to determine the maintenance strategy of the base-isolated rubber bearing is proposed based on the long-term seismic performance of the steel bridge pier.The lifecycle analysis of existing types of bridges and rationalized bridges were performed. The characteristics of the lifecycle cost and lifecycle environmental impact considering the deterioration were clarified compared the existing types of bridges. These results will be very useful to establish the total management system of bridges. Less