NEESR-SG: Seismic Simulation and Design of Bridge Columns under Combined Actions, and Implications on System Response

NEESR-SG：联合作用下桥梁柱的地震模拟和设计及其对系统响应的影响

• 批准号: 0530737
• 负责人: David Sanders
• 金额: $ 142万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-15 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0530737&HistoricalAwards=false
• 关键词: NEESR; SG; Seismic; Simulation; Design

NEESR-SG: Seismic Simulation and Design of Bridge Columns under Combined Actions, and Implications on System ResponseABSTRACTDavid Sanders, University of Nevada, Reno, PIAbdeldjelil DJ Belarbi, University of Missouri, Rolla, Co-PIShirley Dyke, Washington University, Co-PIAmr Elnashai, University of Illinois, Urbana-Champaign, Co-PIJian Zhang, University of California, Los Angeles, Co-PIBridge columns are subjected to combinations of actions and deformations, caused by spatially-complex earthquake ground motions, features of structural configurations and the interaction between input and response characteristics. Combined actions/loadings can have significant effects on the force and deformation capacity of reinforced concrete columns, resulting in unexpected large deformations and extensive damage that in turn influences the performance of bridges as vital components of transportation systems. These effects should be considered in earthquake analysis and design of bridges so that significant earthquake damage and severe disruption of transportation systems can be reduced. The objectives of the project are to develop a fundamental knowledge of the impact of combined actions on column performance and system response and to establish analysis and design procedures that include the impact at both the component and system levels. The objectives will be realized by integrating analytical and experimental research where physical tests are driven by analyses and simulations that examine the system response of various bridge types under different loading conditions. The analytical models are calibrated by experimental data and then extended to system response. The experimental program includes quasi-static testing of twenty-four large columns (fourteen will be funded by NEES) providing fundamental behavior including the impact of torsional moments at University of Missouri, Rolla (UMR), pseudo-dynamic testing of three large and four small scale columns with variable axial load, within a bridge system simulation, at the University of Illinois at Urbana-Champaign (UIUC), real-time dynamic testing of eight large scale columns with bidirectional, torsional and variable axial load inputs at University of Nevada, Reno (UNR), four tests provided by the University of Mexico (UNAM), plus an integrated experiment with three columns linked through simulation, conducted at UIUC by UMR. Fragility analysis will be undertaken, leading to the derivation of probabilistically-based fragility relationships for bridges subjected to combined action. Simplified analysis and design tools will be developed as well as the necessary code language to change the existing practice. Design and analysis methods will be derived that will affect the earthquake design practice in the US and internationally. Coordination of an integrated test program has already begun between the US and Japanese researchers. Analysis components will be done at UCLA, UIUC, UMR and UNR. An integrated education, training and outreach program, lead by Washington University, will span from 4th graders to practicing engineers. Modules will be developed for teachers and professors that can be inserted in their courses. Modules will be used by the research team in summer camps, visits to local elementary, middle and high schools, undergraduate and graduate courses and in continuing education courses. Specific programs are targeted towards underrepresented groups. To achieve its objectives, the project will utilize the NEESit cyber-infrastructure, state-of-the-art instrumentation and high-speed data acquisition systems, the NEES equipment sites at UNR and UIUC and the non-NEES site at UMR, which has committed to joining NEESgrid.

NEESR-SG：复合作用下桥梁柱的地震模拟与设计及其对系统响应的影响摘要David Sanders，内华达州大学，里诺，PIAbdeldjelil DJ Belarbi，密苏里州大学，Rolla，Co-PIShirley Dyke，华盛顿大学，Co-PIAmr Elnashai，伊利诺伊大学，厄巴纳-香槟分校，Co-PIJian Zhang，加州大学，洛杉矶，Co-PI桥梁柱承受复合作用和变形，由于地震动的空间复杂性、结构的外形特征以及输入与反应特性的相互作用，组合作用/荷载会对钢筋混凝土柱的受力和变形能力产生显著影响，导致意外的大变形和大范围损坏，进而影响桥梁作为交通系统重要组成部分的性能。在桥梁的地震分析和设计中应考虑这些影响，以便减少重大地震破坏和交通系统的严重中断。该项目的目标是发展综合行动对色谱柱性能和系统响应的影响的基本知识，并建立分析和设计程序，包括组件和系统两级的影响。这些目标将通过整合分析和实验研究来实现，其中物理测试由分析和模拟驱动，这些分析和模拟将检查各种桥梁类型在不同负载条件下的系统响应。 分析模型由实验数据校准，然后扩展到系统响应。 实验方案包括24根大柱的准静态试验（其中14个项目将由NEES资助）提供基本性能，包括密苏里州罗拉大学（UMR）的扭转力矩影响，伊利诺伊大学香槟分校（UIUC）的桥梁系统模拟中的3个大型和4个小型柱的伪动态试验，在内华达州里诺大学（UNR）进行的八个大型柱的双向、扭转和可变轴向载荷输入的实时动态测试，墨西哥大学（UNAM）提供的四个测试，以及UMR在UIUC进行的通过模拟连接的三个柱的综合实验。 脆弱性分析将进行，导致推导出基于概率的脆弱性关系的桥梁受到联合行动。将开发简化的分析和设计工具以及必要的代码语言，以改变现有做法。设计和分析方法将影响美国和国际上的地震设计实践。美国和日本研究人员已经开始协调一项综合测试计划。 分析组件将在UCLA、UIUC、UMR和UNR进行。由华盛顿大学牵头的一个综合教育、培训和推广项目将涵盖从四年级学生到执业工程师的各个方面。 将为教师和教授开发可插入其课程的模块。 研究小组将在夏令营、访问当地小学、初中和高中、本科和研究生课程以及继续教育课程中使用这些模块。具体方案针对代表性不足的群体。为了实现其目标，该项目将利用NEESit网络基础设施，最先进的仪器和高速数据采集系统，UNR和UIUC的NEES设备站点以及UMR的非NEES站点，该站点已承诺加入NEESgrid。