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​​该项目中，将开发一种全新的横向承载桩分析和设计方法。 由于在解决层状弹性土中承受侧向荷载的桩问题的分析上取得了突破，这种新方法现在成为可能。 对于头部受力和/或力矩加载的桩所获得的解基于虚功原理、变分计算的结果和初始参数的方法。 该方法适用于具有任意土层数的土壤沉积物以及单桩或桩群。 在土壤应力应变响应中引入非线性将使该分析成为解决实际工程问题的理想选择。这种创新方法用于设计承受风、地震、交通、波浪和土压力载荷的桩支撑结构基于弹性响应的封闭式解决方案，因此更易于使用，也更易于工程师理解（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别引入的）。 它捕获其他方法无法捕获的土壤和桩相互作用的各个方面，例如桩横截面与周围土壤的 3D 相互作用以及出现在土壤中和沿土-桩界面的剪应力。 该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，可以合理地计算土壤非线性。 直接获得沿桩长方向的桩挠度、弯矩和剪力分布（结构设计所需）。计划通过现场和实验室实验方法（包括离心机测试和先进的 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。为了促进业界采用这种新颖的方法，将制定一项技术转让计划。 还将制定一项教育计划，其中包括向执业工程师、教育工作者和学生提供短期课程和网络研讨会（将为少数族裔教育工作者和学生参加短期课程提供激励）。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。