Seismic Design Methodology Based on Reliability Theory in Consideration of Lifetime

基于可靠性理论并考虑寿命的抗震设计方法

基本信息

批准号：
11450168
负责人：
SUZUKI Motoyuki
金额：
$ 6.46万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450168/
关键词：
lifetime reliability theory seismic design RC bridge pier pile foundation seismic risk analysis structural optimal theory damage index 橋梁鉄筋コンクリート橋梁システム破壊確率限界状態不確定要因損傷終局限界状態動的解析プログラム

项目摘要

1. New evaluation method of lifetime risk in RC member is proposed on the basis probability matrix. It is clarified that current seismic method does not necessarily provide sufficient safety during the lifetime of RC structure.2. A new evaluation method for the probability of failure of a structural system based on reliability theory is proposed. From the numerical examples, it is demonstrated that this method possesses high accuracy and simplicity.3. Design flow charts which can cope with an arbitrarily given safety level are formulated by reliability-based optimal theory considering structural system. Then the proposed method is applied to the seismic design of rigid-frame bridge piers and RC bridge pier. As a result, it is confirmed that (1) the RC bridge piers so as to attain the prescribed reliability can be designed by the proposal method and (2) the safety of bridge piers, which are deigned based on the current code, are not uniform.4. The effect of uncertainties in reinforced concrete (RC) bridge systems on the response of the RC bridge pier and cast in place pile were statistically and analytically studied, and quantitative evaluations of variations in that response were obtained. Then seismic design method was discussed in which such uncertainties were considered in order to keep cast in place pile from yielding. The horizontal seismic coefficient for cast in place pile was proposed based on the system reliability theory and dynamic analysis for the bridge systems.

1.提出了基于概率矩阵的RC成员终身风险评价新方法。说明当前的抗震方法不一定能在RC结构的使用寿命内提供足够的安全性。 2．提出了一种基于可靠性理论的结构系统失效概率评估新方法。算例表明该方法具有较高的精度和简单性。 3．通过考虑结构系统的基于可靠性的优化理论，制定了能够应对任意给定安全水平的设计流程图。然后将该方法应用于刚构桥墩和钢筋混凝土桥墩的抗震设计。结果表明：（1）可以通过建议方法设计RC桥墩以达到规定的可靠性；（2）根据现行规范设计的桥墩安全性不符合要求。制服.4。对钢筋混凝土（RC）桥梁系统的不确定性对 RC 桥墩和现浇桩响应的影响进行了统计和分析研究，并获得了响应变化的定量评估。然后讨论了考虑这些不确定性的抗震设计方法，以防止现浇桩屈服。基于系统可靠性理论和桥梁系统动力分析，提出了现浇桩水平抗震系数。