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Methodology of Reliability Analysis and Evaluation of Earthquake Resistant Performance of Deteriorating Concrete Bridges

劣化混凝土桥梁抗震性能可靠性分析与评价方法

基本信息

批准号：
11650466
负责人：
MORIKAWA Hidenori
金额：
$ 2.5万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650466/
关键词：
concrete bridge deterioration earthquake resistant performance reliability condition rating shear strength damage correlation Marcov-chain 非破壊試験 ASR 個別要素法

项目摘要

(1) On chloride induced deterioration and carbonation of concrete, a condition rating method based on visual inspection, electro-chemical experiments and prediction of deterioration, was developed and applied to an actual deteriorating RC structure and demonstrated its suitability. This method considers the state of deterioration (Latent period, Development period, Acceleration period, Deterioration period) and the performance such as load carrying capacity influence on surrounding, and, performance over time for these two items.(2) A series of shear strength testing of RC beams were conducted considering the distribution of concrete strength and the cold joint defect and a estimation equation of shear strength considering these factors was proposed.(3) The earthquake response analyses of bridge structural system including RC single piers were performed to evaluate the damage correlation among members such as piers, bearings, and, superstructures.(4) The performance requirements for concrete structures were classified and the relationship between deterioration and performance degradation was modeled. Then, a basic concept of performance verification and scenario for lifetime of concrete structures were proposed.(5) An evaluation method for multiple damage states of bridge structural system due to strong earthquake was proposed. The probability of multiple damage states of structural elements were evaluated by Marcov-chain.(6) A series of shear strength testing of RC beams with deterioration due to Alkali-Silica Reaction were carried out to evaluate degradation in shear strength under reversed cyclic loading.(7) A study on a number of factors such as ground motion components, structural defects, etc., influencing the failure of RC single column bridge piers was carried out by the Discrete Element Method (DEM).

(1)针对混凝土氯致劣化和碳化问题，提出了一种基于目测、电化学实验和劣化预测的状态评定方法，并将其应用于实际劣化RC结构，验证了其适用性。该方法考虑了劣化状态（潜伏期、发展期、加速期、劣化期）和承载能力等性能对周围环境的影响，以及这两个项目的性能随时间的变化。(2)考虑混凝土强度分布和冷缝缺陷，对钢筋混凝土梁进行了一系列抗剪强度试验，提出了考虑这些因素的抗剪强度估算方程。(3)对含RC单桥墩的桥梁结构体系进行地震反应分析，评价桥墩、支座、上部结构等构件之间的损伤相关性。(4)对混凝土结构的性能要求进行了分类，并建立了劣化与性能退化的关系模型。在此基础上，提出了混凝土结构性能验证和寿命场景的基本概念。(5)提出了桥梁结构体系在强震作用下多种损伤状态的评估方法。采用马尔可夫链法对结构单元出现多种损伤状态的概率进行了评估。(6)对碱-硅反应劣化的RC梁进行了一系列抗剪强度试验，以评价反循环荷载作用下的抗剪强度劣化。(7)采用离散元法（DEM）对影响RC单柱桥墩破坏的地震动分量、结构缺陷等因素进行了研究。