bopshan.blogg.se

1. MODULUS 6 BACKCALCULATION PDF
2. MODULUS 6 BACKCALCULATION MANUAL
3. MODULUS 6 BACKCALCULATION VERIFICATION

In backcalculating layer moduli, the measure of how well the calculated deflection basin matches (or converges to) the measured deflection basin was previously described as the “error check.” This is also referred to as the “goodness of fit” or “convergence error.” The primary measure of convergence is typically Root Mean Square (RMS) or Root Mean Square Error (RMSE). However, the pavement layer moduli backcalculation techniques used so far have been. MICH-BACK software is based on the back-calculation programs which makes repeated calls to an elastic layer sub-routine to match the measured and calculated deflections and whether they are within a tolerance. Backcalculation Flowchart Measure of Convergence Backcalculation in KUAB software searches a database of calculated deflection basin that best matches the measured deflection basin. In some backcalculation programs, a range (minimum and maximum) of moduli are selected or calculated to prevent program convergence to unreasonable moduli levels (either high or low).įigure 1. Various methods have been employed within the various backcalculation programs to converge on a set of layer moduli which produces an acceptable error between the measured and calculated deflection basins. There are various error measures which can be used to make such comparisons (more on this in a subsequent paragraph in this section). Six programs were selected for detailed evaluation - ELCON and ELI-BACK for rigid pavement, and ISSEM4, MODCOMP3, MODULUS and WDEF for flexible pavements.

MODULUS 6 BACKCALCULATION VERIFICATION

This element simply compares the measured and calculated basins. FIGURE 6 Line-of-equality graph of verification data by use of binder shift factors: (a) loglog and (b) arithmetic scales. Layered elastic computer programs are generally used to calculate a deflection basin. These moduli are usually estimated from user experience or various equations. circular plate with a radius of 6 inches resting on the. 6 et al, 2008) is similar to that of a vehicle loading at a high speed. The final product was used in backcalculating pavement layer moduli from actual field.

The seed moduli are the initial moduli used in the computer program to calculate surface deflections. backcalculated moduli (Irwin, 1989), which is strongly related to pavement. FPS 21 Click here to go to the FPS 21 download page.

MODULUS 6 BACKCALCULATION MANUAL

Right-click and choose 'Save Target As' to save the manual to your hard drive.

MODULUS 6 BACKCALCULATION PDF

Click here to open the Modulus 6 PDF manual. The surface layer modulus cal culated by ELMOD 6 for the four-layer m odel was high, ranging from 72 MPa to 34,319 MPa, with an average of 13,2 51 MPa (Table 5). Includes all layer thicknesses and load levels for a specific test location. Modulus 7.0 Click here to go to the Modulus 7.0 download page. Includes the measured pavement surface deflections and associated distances from the load.