Effect of earthquake ground motions on fragility curves of highway bridge piers based on numerical simulation     

Kazi R. Karim  Fumio Yamazaki 《地震工程与结构动力学》2001,30(12):1839-1856

Fragility curves express the probability of structural damage due to earthquakes as a function of ground motion indices, e.g., PGA, PGV. Based on the actual damage data of highway bridges from the 1995 Hyogoken‐Nanbu (Kobe) earthquake, a set of empirical fragility curves was constructed. However, the type of structure, structural performance (static and dynamic) and variation of input ground motion were not considered to construct the empirical fragility curves. In this study, an analytical approach was adopted to construct fragility curves for highway bridge piers of specific bridges. A typical bridge structure was considered and its piers were designed according to the seismic design codes in Japan. Using the strong motion records from Japan and the United States, non‐linear dynamic response analyses were performed, and the damage indices for the bridge piers were obtained. Using the damage indices and ground motion indices, fragility curves for the bridge piers were constructed assuming a lognormal distribution. The analytical fragility curves were compared with the empirical ones. The proposed approach may be used in constructing the fragility curves for highway bridge structures. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

新亚欧大陆桥的走向及相关问题探讨     

顾家Yu 《干旱区地理》1996,19(2):74-77

第二亚欧大陆桥已成为国际社会关注的焦点之一，但各国对其走向有着不同的见解和主张。本文概述了第二亚欧大陆桥各种走向的有关问题，并强调对其沿线环境灾害必须重视加以治理。  相似文献   

上海地区桥梁工程地质勘察与评价     

曾荣波 《上海国土资源》1993,(2):38-45

本文通过总结多年来桥梁工程勘察的实践经验,针对上海地区的工程地质特点,建造桥梁对勘察的要求,对桥梁墩、台基础型式,基础持力层的选择,地基土特性,勘察方法,土工试验项目的确定,勘察报告的编写等作了分析,论述 。  相似文献   

双向近场地震作用下HDR隔震梁桥地震响应研究     

李琛  徐文平  孟宪锋  赵国辉  李宇 《震灾防御技术》2020,15(1):67-76

以HDR隔震梁桥多自由度（MDOF）模型和等效双线性单自由度（SDOF）模型为研究对象，以典型近场地震动作为输入，研究HDR支座双向耦合效应对HDR隔震梁桥地震响应的影响。研究结果表明:不考虑双向耦合效应的HDR支座滞回曲线呈典型双线性；考虑双向耦合效应的HDR支座滞回曲线面积小于不考虑双向耦合效应的HDR支座滞回曲线面积。不考虑双向耦合效应的顺桥向HDR支座位移峰值d_b大于考虑双向耦合效应时，但横桥向的结果相反。近场地震作用下，对梁桥进行HDR支座隔震设计时，忽略双向耦合效应计算得到的墩底剪力峰值和弯矩峰值均偏于保守。可忽略HDR支座双向耦合效应对HDR隔震梁桥近场地震能量的影响。  相似文献   

Effect of near-fault earthquake on bridges: lessons learned from Chi-Chi earthquake   总被引：4，自引：1，他引：3  

Chin-Hsiung?LohEmail author  Wen-I?Liao  Juin-Fu?Chai 《地震工程与工程振动(英文版)》2002,1(1):86-93

The objective of this paper is to describe the lessons learned and actions that have been taken related to the seismic design of bridge structures after the Chi-Chi, Taiwan earthquake. Much variable near-fault ground motion data was collected from the rupture of Chelungpu fault during the Chi-Chi earthquake, allowing the seismic response of bridge structures subjected to these near-fault ground motions to be carefully examined. To study the near-fault ground motion effect on bridge seismic design codes, a two-level seismic design of bridge structures was developed and implemented. This design code reflects the near-fault factors in the seismic design forces. Finally, a risk assessment methodology, based on bridge vulnerability, is also developed to assist in decisions for reducing seismic risk due to failure of bridges. Director of Center for Research on Earthquake Engineering. Supported by: the Science Council, Chinese Taipei, under grant no. SC 90-2211-E-002-028.  相似文献   

Modelling considerations in probabilistic performance‐based seismic evaluation: case study of the I‐880 viaduct     

Sashi K. Kunnath  Leah Larson  Eduardo Miranda 《地震工程与结构动力学》2006,35(1):57-75

Limitations associated with deterministic methods to quantify demands and develop rational acceptance criteria have led to the emergence of probabilistic procedures in performance‐based seismic engineering. The Pacific Earthquake Engineering Research performance‐based methodology is one such approach. In this paper, the impact of certain modelling decisions made at different stages of the evaluation process on the performance assessment of a typical multi‐bent viaduct is examined. Modelling, in the context of this paper, covers hazard modelling, structural modelling and loss modelling. The specific application considered in this study is a section of an existing viaduct in California: the I‐880 interstate highway. Several simulation models of the viaduct are developed, a series of nonlinear time‐history analyses are carried out to predict demands, measures of damage are evaluated and the probability of closure of the viaduct is estimated using the specified hazard for the site. It is concluded that the methodology offers several advantages over existing deterministic performance‐based procedures. Results of the investigation indicate that the assessment methodology is particularly sensitive to the reliability of decisions made by bridge inspectors following a seismic event, and to the dispersion in the demand estimation, which in turn is influenced by several factors including soil–structure interaction effects and ground motion scaling procedures. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

多波束在海底复杂地形条件下大比例尺测量方法探讨     

马文亮  卢秋芽 《上海国土资源》2006,22(1):19-22,28

文章主要对使用大比例尺进行海底地形测量方法进行了简要的描述,测量过程中的方法技术、数据处理方法、测量效果说明多波束在复杂地形条件下可以取得良好的效果。  相似文献   

特大型桥梁施工GPS高程控制网技术研究   总被引：2，自引：0，他引：2  

吴迪军  黄全义  张建军  李书银  熊小莉 《测绘信息与工程》2006,31(5):18-19

探索了采用GPS技术建立桥梁施工高程控制网的难点及关键问题,分析了GPS跨河高程传递测量方法的技术要点,结合工程实例得出了一些结论和建议。  相似文献   

核筒悬挂结构三道抗震防线时程分析设计方法   总被引：2，自引：0，他引：2  

周坚  伍孝波 《世界地震工程》2006,22(1):49-56

提出了高层建筑核筒式悬挂结构三道抗震防线的时程分析设计计算方法,并编制了相应的计算程序Hangsys。计算结果与核筒悬挂结构模拟地震振动台试验的结果符合较好。因此,核筒悬挂结构完全可以通过精心设计使该类结构具有多道抗震防线,使悬挂结构既具有安全性又具有适用性。  相似文献   

基于改进遗传算法的公路桥梁损伤程度标定的两阶段法     

薛祥  霍达  滕海文 《世界地震工程》2006,22(3):60-65

提出了基于改进遗传算法的公路桥梁损伤程度标定的两阶段法。第一阶段:应用静应变残差进行损伤定位;第二阶段:基于已经识别出的损伤位置,利用改进的遗传算法进行损伤程度的标定。两阶段方法有效地克服了同时进行常规的损伤位置识别和损伤程度的标定的收敛速度慢、存储空间大及可能误标定等问题。某三跨连续桥梁应用分析发现,在已知很少实测数据的情况下,对损伤程度的识别取得较理想的效果,证实了基于改进遗传算法的两阶段法用于损伤程度的识别具有更高的效率,更好的灵敏度、稳定性和可靠性。  相似文献