SBIR Phase I: A Non-Destructive Method for Examining BridgeFoundations

SBIR 第一阶段：检查桥梁基础的非破坏性方法

• 批准号: 9660071
• 负责人: Edward Mercado
• 金额: $ 7.98万
• 依托单位: North American Geotechnical Co
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9660071&HistoricalAwards=false
• 关键词: SBIR; Phase; Non; Destructive; Method

This Small Business Innovation Research Phase I project will develop and refine non-destructive methods by which the lengths and numbers of piles and drilled shafts and the existence of severe structural defects in bridge foundations can be determined through non-destructive and non-invasive seismic survey means. The survey techniques proposed are the shear wave reflection profiling survey (SWRS) method and the ambient vibration survey (AVS) method. A secondary objective will be to determine through field experimentation any limitations that the methods may have. A known limitation is that none of the currently available conventional methods can determine pile widths. After the migration data processing step, it is possible to determine the pile width or shaft diameter and the number of piles in a pile group from the SWRS data Measuring pile numbers/group, shaft separation and width/diameter is a function of the horizontal resolution obtainable from the data, which is controlled by the field data acquisition parameters of detector spacing and source peak frequency. Specifically, shear-wave seismic reflection profiling surveys and ambient vibration surveys will be conducted, using traffic on the bridge as the exciting force, of bridge foundations along I-45 near the University of Houston in the Houston District of the Texas Department of Transportation (TxDOT) as a means of verifying the validity and utility of both methods. The Houston District of TxDOT has indicated that they will assist the project in gaining access to the test sites and to the as-built construction records. The Federal Highway Administration estimates that over the next 20 years $164.9 billion must be invested to address the tremendous rehabilitation backlog and improve accruing bridge deficiencies. The benefits of the proposed research would be very significant cost savings in the rehabilitation of bridge foundations by identifying which bridge foundations are safe and which need rehabilitation. The potential for such significant cost savings will make the commercial availability of a survey system a profitable undertaking for both the system supplier and the end user.

该小型企业创新研究第一阶段项目将开发和完善非破坏性方法，通过这些方法，可以通过非破坏性和非侵入性地震勘测手段确定桩和钻孔轴的长度和数量以及桥梁基础中是否存在严重的结构缺陷。 建议的测量技术是横波反射剖面测量（SWRS）方法和环境振动测量（AVS）方法。 第二个目标是通过实地试验确定这些方法可能具有的任何局限性。 一个已知的限制是，目前可用的传统方法都不能确定绒头宽度。 在偏移数据处理步骤之后，可以从SWRS数据确定桩宽或桩身直径以及桩群中的桩数 测量桩数量/组、轴间距和宽度/直径是从数据获得的水平分辨率的函数，其由检测器间距和源峰值频率的现场数据采集参数控制。 具体而言，将使用桥上的交通作为激振力，对德克萨斯州交通部（TxDOT）休斯顿区休斯顿大学附近沿着I-45的桥梁基础进行剪切波地震反射剖面测量和环境振动测量，以验证这两种方法的有效性和实用性。 TxDOT的休斯顿地区表示，他们将协助该项目进入测试场地和竣工施工记录。 联邦公路管理局估计，在未来20年内，必须投资1649亿美元，以解决巨大的修复积压和改善日益严重的桥梁缺陷。 拟议的研究的好处是通过确定哪些桥梁基础是安全的，哪些需要修复，在修复桥梁基础方面节省了大量成本。 这种大幅度节省成本的潜力将使测量系统的商业可用性成为系统供应商和最终用户的有利可图的事业。