A Novel Method of Analysis of Single Piles and Pile Groups Subjected to Lateral Loads

承受横向荷载的单桩和群桩分析新方法

• 批准号: 0556347
• 负责人: Rodrigo Salgado
• 金额: $ 31.5万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0556347&HistoricalAwards=false
• 关键词: Novel; Method; Analysis; Single; Piles

PROJECT ABSTRACTIn this project, a completely new method for the analysis and design of laterally-loaded piles will be developed. The new method is now possible because of an analytical breakthrough in the solution of the problem of a pile subjected to lateral load in a layered elastic soil. The solution obtained for a pile loaded at its head by a force and/or a moment is based on the use of the principle of virtual work, the results of the calculus of variations and the method of initial parameters. The method will be applicable to soil deposits with an arbitrary number of soil layers and to single piles or pile groups. Introduction of non-linearity in the stress-strain response of the soil will make the analysis ideal to address realistic engineering problems.This innovative approach to the design of piles supporting structures subjected to wind, seismic, traffic, wave, and earth-pressure loads is based on a closed-form solution for elastic response, and is therefore simpler to use and easier for engineers to relate to (because the soil stress-strain response is introduced at the element level through parameters that are familiar to engineers). It captures aspects of the interaction of the soil and pile that other methods cannot capture, such as the 3D interaction of the pile cross-section with the surrounding soil and the shear stresses that appear in the soil and along the soil-pile interface. The proposed method will also provide the displacement field in the soil around the pile, allowing, by combination with a non-linear stress-strain model, the accounting of soil non-linearity in a rational way. The pile deflection, bending moment and shear force profiles along the pile length (needed for structural design) are directly obtained. Extensive validation is planned by field and laboratory experimental methods (including centrifuge tests and advanced X-Ray Computed Tomography technology) and by numerical methods.To facilitate adoption of this novel method by the industry, a technology transfer program will be developed. An educational program will also be developed, which will include short courses and webinars to be offered to practicing engineers, educators and students (incentives will be available for minority educators and students to attend the short courses). The project will allow establishment of new international collaborative ties with Kumamoto University in Japan and with the Centre for Geomechanics at the University of Nottingham in the U.K.

项目摘要在本项目中，将开发一种全新的横向受载桩的分析和设计方法。 由于在层状弹性土中受横向荷载作用的桩问题的解析解上的突破，新方法现在成为可能。 桩顶受力和/或力矩作用时的解是根据虚功原理、变分法结果和初始参数法得出的。 该方法适用于任意土层数的土层堆积，也适用于单桩或群桩。 在土的应力应变响应中引入非线性将使分析理想地解决实际工程问题。这种创新的方法设计的桩支撑结构承受风，地震，交通，波浪和土压力荷载是基于弹性响应的封闭形式的解决方案，因此使用起来更简单，工程师也更容易理解（因为土壤应力-应变响应是通过工程师熟悉的参数在单元级引入的）。 它捕捉了其他方法无法捕捉的土壤和桩的相互作用方面，例如桩横截面与周围土壤的三维相互作用以及土壤中和沿着土壤-桩界面出现的剪切应力。 所提出的方法还将提供桩周围土壤中的位移场，通过与非线性应力-应变模型相结合，以合理的方式计算土壤非线性。 直接得到桩身挠度、弯矩和剪力沿桩长的沿着分布（结构设计所需）。计划通过现场和实验室实验方法（包括离心试验和先进的X射线计算机断层扫描技术）以及数值方法进行广泛的验证。为了促进工业界采用这种新方法，将制定一项技术转让计划。 还将制定一个教育方案，其中包括向执业工程师、教育工作者和学生提供的短期课程和网络研讨会（将为少数民族教育工作者和学生提供参加短期课程的奖励）。该项目将与日本熊本大学和英国诺丁汉大学地质力学中心建立新的国际合作关系。