基于LCA和时变可靠度分析的桥梁维护策略优化

来源 :公路交通科技 | 被引量 : 0次 | 上传用户:yueyue7373
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
为研究桥梁在生命周期过程中维护对安全性的提升,及桥梁维护过程所带来的环境影响,基于不确定性的思想,将失效概率作为结构安全性的表征指标,分析了桥梁结构有无维护和进行预防性维护、实质性维护的时变可靠度变化;基于考虑终点破坏模型的生态指标法,做出了桥梁的生命周期环境影响评价(Life cycle assessment,LCA);采用帕累托优化方法进行了失效概率与生命周期环境影响值双目标下的桥梁维护策略优化。运用该方法分析了某钢筋混凝土桥梁在有预防性维护和没有预防性维护情景下,以及预防性维护首次实施时间与实施周期的不同所引起的生命周期累积失效概率和环境影响的变化,并对其维护策略进行了优化分析。结论表明合理安排多次预防性维护能够有效延迟实质性维护的发生时间并降低生命周期环境影响,可以根据对结构安全储备要求和环境影响要求选择桥梁最优维护策略。 In order to study the maintenance of the bridge during the life cycle of the bridge to enhance the safety and environmental impact of the bridge maintenance process, based on the uncertainty of thinking, the probability of failure as a structural safety indicators, analysis of the bridge structure with or without Maintain and carry out preventive maintenance and substantive maintenance. Based on the ecological indicator method that takes the end-point failure model into account, a life cycle assessment (LCA) of the bridge was made. Pareto Optimization The method was used to optimize the bridge maintenance strategy under the dual objective of failure probability and life cycle environmental impact value. This method is used to analyze the change of life cycle cumulative failure probability and environmental impact caused by the difference between the first implementation time and the implementation period of preventive maintenance in the condition of preventive maintenance and non-preventive maintenance of a reinforced concrete bridge. Its maintenance strategy has been optimized and analyzed. The conclusion shows that rational arrangement of multiple preventive maintenance can effectively delay the occurrence time of substantive maintenance and reduce the environmental impact of life cycle, and can choose the optimal bridge maintenance strategy according to the requirement of structural safety reserve and environmental impact.
其他文献
Predicting long-term potential human health risks from contaminants in the multimedia environment requires the use of models.However, there is uncertainty assoc
为进一步了解东北季节性冰冻条件下固化剂稳定细粒土的工程特性,采用新型TG-2型液体土壤固化剂配合水泥、石灰对粘性土进行了综合加固处理。在水泥、石灰和土工程性质试验的
We study the attack vulnerability of network with duplication-divergence mechanism. Numerical results have shown that the duplication-divergence network with la
鉴于现有冷补沥青混合料易松散的特性,通过进行不同纤维掺量下冷补沥青混合料的开裂能试验、冻融劈裂试验和飞散试验,分析纤维掺量对冷补沥青混合料路用性能的影响。试验结果
The quantitative structure-activity relationship (QSAR) of 16 pyrazole compounds was studied by ab initio method at the HF/3-21G level using Guassian03 soft. Th
为研究地震力作用下黄土边坡的稳定性,根据地震角将地震力分解为水平地震力和竖向地震力。引入均方根加速度表征地震振幅大小,结合地震波加速度反应谱,分别计算出1/4持时、1/
能量法为分析沥青混合料疲劳特性的有效方法之一,应用于分析水泥混凝土桥面铺装复合结构的疲劳特性。首先,介绍了沥青混合料的能耗分析方法;其次,根据铺装复合结构设计原理,
蝶形拱桥由于拱肋外倾其非线性行为规律较之普通拱桥更加难以掌握,传统未充分考虑非线性影响的设计方法已不再适用。在自编程序的基础上,全面分析了各种非线性因素对蝶形拱桥
为研究某公路、铁路两用斜拉桥公路桥面钢-混结合段的受力性能,对其进行了非线性有限元分析.同时依据相似性原则设计了钢-混结合段的大比例试验模型,测试了荷载作用下试验模
带有任意悬臂的梯形单箱单室箱梁,在定义其位移翘曲函数时,需要在全截面上附加一均匀的轴向位移,以使纵向位移在全截面上构成轴力自平衡。为确定附加轴向位移对箱梁上、下翼