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- W2247432020 abstract "THE IOWA DEFLECTION FORMULA IS BASED ON THE ASSUMPTION THAT THE SUPPORTING STRENGTH OF BURIED CORRUGATED METAL PIPE INSTALLATIONS ARISES THROUGH THE LATERAL REACTIVE SOIL PRESSURES INDUCED AT THE SIDES OF THE PIPE. SINCE ITS INTRODUCTION MORE THAN 30 YEARS AGO, THE IOWA DEFLECTION FORMULA HAS SERVED AS A BASIC CRITERION FOR THE DESIGN OF BURIED FLEXIBLE PIPE SYSTEMS. THE FORMULA IS BASED ON AN ASSUMED DISTRIBUTION OF LOADING AROUND THE PIPE, AND CONTAINS THREE PARAMETERS THAT ARE EMPIRICAL IN NATURE. THE PRESENT STUDY EXAMINES THE SIGNIFICANCE AND POSSIBLE VARIATION OF THESE PARAMETERS IN THE DEFLECTION EQUATION. LIMITED FIELD STUDIES HAVE INDICATED THAT REALISTIC VARIATIONS IN THESE PARAMETERS CAN LEAD TO AN ALMOST THREEFOLD CHANGE IN DESIGN REQUIREMENTS. ONE OF THE MOST INFLUENTIAL PARAMETERS IN THE FORMULA IS THE MODULUS E'. VALUES OF E' AS DETERMINED FROM THE MEASURED RESPONSE OF FULL-SCALE INSTALLATIONS EXHIBIT A THIRTYFOLD VARIATION. YET THESE DATA FORM THE BASIS FOR ESTABLISHING RECOMMENDED VALUES OF E' FOR DESIGN USE. EXTRAPOLATION OF THE OBSERVED DEFLECTIONS FROM FIELD TESTS SHOWS THAT IN MOST CASES USE OF THE SUGGESTED DESIGN CRITERIA YIELDS UNCONSERVATIVE FILL HEIGHTS. THE PRESENT STUDY SHOWS NO STRONG CORRELATION BETWEEN E' AND PERCENTAGE OF STANDARD PROCTOR DENSITY FOR THE SOIL ADJACENT TO THE PIPE, THE PIPE DIAMETER, OR THE RATIO OF FILL HEIGHT TO PIPE DIAMETER. A STATISTICAL ANALYSIS COMPARES OBSERVED VALUES OF E' WITH COMMON PROBABILITY DISTRIBUTIONS, AND A LOG-NORMAL DISTRIBUTION IS FITTED. PROBABILITIES ASSOCIATED WITH VARIOUS RANGES OF E' CONFIRM THAT THERE IS NO RATIONAL BASIS FOR RECOMMENDING A DESIGN VALUE THAT IS MUCH GREATER THAN THE MEDIAN, OR CENTRAL, VALUE." @default.
- W2247432020 created "2016-06-24" @default.
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- W2247432020 date "1972-01-01" @default.
- W2247432020 modified "2023-09-24" @default.
- W2247432020 title "THE IOWA DEFLECTION FORMULA: AN APPRAISAL WITH DISCUSSION" @default.
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