Deformation-Based Seismic Analysis and Design of Waterfront Retaining Structures

基于变形的滨水区挡土结构地震分析与设计

• 批准号: 9900211
• 负责人: Panos Dakoulas
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900211&HistoricalAwards=false
• 关键词: Deformation; Based; Seismic; Analysis; Design

Waterfront structures include gravity walls, sheet pile walls, and pile supported wharfs which are vulnerable to earthquake damage the response of such structures to strong ground shaking depends primarily on the complex soil-structure-foundation interaction and the undrained behavior of the foundation and backfill soils. Current philosophy in the design of such system aims at limiting deformations of the supported structures to acceptable levels. Depending on their importance and function.The objective of this research is to develop a deformation-based method of analysis for the seismic evaluation and design of waterfront structures. The seismic behavior and damage of typical two-dimensional gravity walls and sheet pile walls that are vulnerable to excess pore water pressure buildup and liquefaction, will be investigated. The performance of various ground improvement techniques using as criterion the predicted permanent deformation for different levels of ground shaking intensity and will provide guidelines for remediation optimization. An effective-stress, nonlinear finite element method, coupled with boundary elements for accurate modeling of the energy radiation through outgoing waves will be used. The foundation, backfill and near-field soils are modeled with a rigorous, efficient critical state model, that can predict densification, pore water pressure buildup, liquefaction and cyclic mobility in sands. The numerical model can simulate successfully the generation, redistribution and dissipation of excess pore water pressures and reveal the deformational mechanisms leading to possible failure. The investigation will be performed in close collaboration with researchers from Shimizu Corporation, Japan and NTUA, Greece. This is an award supported under the 2nd year initiative, NSF 98-36 "US-Japan Urban Earthquake Disaster Mitigation Research."

滨水结构包括重力墙、板桩墙和桩支撑码头，这些结构易受地震破坏，此类结构对强烈地面震动的响应主要取决于复杂的土-结构-地基相互作用以及地基和回填土的不排水行为。 目前此类系统的设计理念旨在将支撑结构的变形限制在可接受的水平。 根据它们的重要性和功能。本研究的目的是开发一种基于变形的分析方法，用于滨水结构的地震评估和设计。 将研究易受超孔隙水压力积聚和液化影响的典型二维重力墙和板桩墙的地震行为和损坏。 各种地面改良技术的性能以不同程度的地面震动强度的预测永久变形为标准，将为修复优化提供指导。 将使用有效应力、非线性有限元方法与边界元相结合，对通过出射波的能量辐射进行精确建模。 使用严格、高效的临界状态模型对地基、回填土和近场土壤进行建模，该模型可以预测沙子的致密化、孔隙水压力积聚、液化和循环流动性。 该数值模型可以成功模拟超孔隙水压力的产生、重新分布和消散，并揭示导致可能失效的变形机制。 该调查将与日本清水公司和希腊 NTUA 的研究人员密切合作进行。 该奖项由第二年倡议 NSF 98-36“美日城市地震减灾研究”支持。