Abstract: Methods are disclosed for nondestructive testing and measuring the structural health of prestressed concrete structures, such as slabs, columns, girders, bridges, towers, elevated storage tanks, silos, cooling towers, wind power generation towers, liquefied gas storage tanks, nuclear power containment buildings, and the like. Measurements are made as the structure undergoes tensioning and detensioning operations. By measuring actual movements of cardinal points on the structure, in an absolute three-dimensional coordinate system, and comparing the measurements to a model—as tension on a tendon is changed—a margin of safety is assured. High accuracy measurements are made by electronic distance measurement (EDM) instruments over hundreds of meters, which yield coordinates of cardinal points with an uncertainty of the order of one part per million.
Type:
Application
Filed:
May 26, 2016
Publication date:
September 22, 2016
Applicants:
Sophie Lin, Trustee of the John Michael Payne Family Trust
Abstract: Methods are disclosed wherein the structural health of a civil structure, pressure vessel, or the like is measured by electronic distance measurement (EDM) from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analyses includes: comparison to a Finite Element Model (FEM); comparison to historical data; and modeling based on linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic analysis.
Type:
Grant
Filed:
May 31, 2012
Date of Patent:
May 31, 2016
Assignees:
Sophie Lin, Trustee of the John Michael Payne Family Trust
Inventors:
David H. Parker, John M. Payne, Sophie Lin
Abstract: Methods are disclosed wherein the structural health of a civil structure, pressure vessel, or the like is measured by electronic distance measurement (EDM) from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analyses includes: comparison to a Finite Element Model (FEM); comparison to historical data; and modeling based on linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic analysis.
Type:
Application
Filed:
May 31, 2012
Publication date:
October 4, 2012
Applicants:
Sophie Lin, Trustee of the John Michael Payne Family Trust
Inventors:
David H. Parker, John M. Payne, Sophie Lin
Abstract: Methods are disclosed wherein the structural health of a civil structure, such as, but not limited to, a bridge or the like is measured by electronic distance measurement (EDM) from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analysis includes: comparison to a Finite Element Model (FEM); comparison to historical data; and modeling based on linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic analysis.
Type:
Grant
Filed:
December 20, 2010
Date of Patent:
June 26, 2012
Assignees:
Sophie Lin
Inventors:
David H. Parker, John M. Payne, Sophie Lin, legal representative