000004487 001__ 4487
000004487 005__ 20141118192659.0
000004487 0177_ $$2doi$$a10.3850/978-981-07-2219-7_P136

000004487 0247_ $$210.3850/978-981-07-2219-7_P136
$$adoi
000004487 04107 $$aeng
000004487 046__ $$k2012-05-23
000004487 100__ $$aChen, Jie-Ru
000004487 24500 $$aCalibration of Multiple Resistance Factors for Drilled Shafts in Multiple Strata

000004487 24630 $$n5.$$pProceedings of the 5th Asian-Pacific Symposium on Structural Reliability and its Applications
000004487 260__ $$bResearch Publishing, No:83 Genting Lane, #08-01, Genting Building, 349568 SINGAPORE
000004487 506__ $$arestricted
000004487 520__ $$2eng$$aDrilled shaft is advantageous for its low noise and vibration during installation. Soil profile with multiple soil layers is often encountered in several metropolises around the world. Analysis and design of drilled shafts in this type of soil profile should consider resistances contributed from different soil types. For reliability based design, the multiple resistance factor design (MRFD) format is the realistic approach, so that different level of safety measure required for clay, sand, gravel, and rock layers can be considered. In this study, the MRFD factors are developed based on a load test database of drilled shafts in multiple strata. The correlations models for unit side resistance are re-examined based on an expanded global database, and the transformation uncertainties are evaluated. The calibration for the MRFD factors considers not only the transformation uncertainties in the correlation models but also the measurement errors in the geotechnical parameters. The resulting MRFD factors are found to be non-uniform, but simple regression equations as given in the form of Eq. (1) can be developed to determine the calibrated MRFD factors.
 <sub></sub> γ=C<sub>0</sub> + C<sub>1</sub>δ<sub>s<sub>u</sub></sub> + C<sub>2</sub>δ<sub>σ<sup>'</sup><sub>v</sub></sub> + C<sub>3</sub>δ<sub>qu</sub> + C<sub>4</sub>R<sub>c</sub> + C<sub>5</sub>R<sub>c</sub><sup>2</sup> + C<sub>6</sub>R<sub>s</sub> + C<sub>7</sub>R<sub>s</sub><sup>2</sup> + C<sub>8</sub>R<sub>r</sub> + C<sub>9</sub>R<sub>r</sub><sup>2</sup>
 where δ is the c.o.v. of the measurement error for the designated geotechnical parameter; R<sub>x</sub> is the ratio of the nominal resistance: R<sub>x</sub> = S<sub>x</sub><sup>*</sup>/( S<sub>c</sub><sup>*</sup>+S<sub>s</sub><sup>*</sup>+S<sub>g</sub><sup>*</sup>+S<sub>r</sub><sup>*</sup>). The regression coefficients c<sub>i</sub>, i = 0 to 9, for all MRFD factors corresponding to a target reliability index of 3.0 are shown in Table 1. The maximum errors of the regression equations are typically small.

000004487 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004487 653__ $$aReliability, MRFD, Drilled shafts, Axial capacity, Side resistance.

000004487 7112_ $$a5th Asian-Pacific Symposium on Structural Reliability and its Applications$$cSingapore (SG)$$d2012-05-23 / 2012-05-25$$gAPSSRA2012
000004487 720__ $$aChen, Jie-Ru$$iChing, Jianye$$iChuang, Bo-Yi
000004487 8560_ $$ffischerc@itam.cas.cz
000004487 8564_ $$s340718$$uhttps://invenio.itam.cas.cz/record/4487/files/P136.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004487 962__ $$r4180
000004487 980__ $$aPAPER