000004489 001__ 4489
000004489 005__ 20141118192700.0
000004489 0177_ $$2doi$$a10.3850/978-981-07-2219-7_P139

000004489 0247_ $$210.3850/978-981-07-2219-7_P139
$$adoi
000004489 04107 $$aeng
000004489 046__ $$k2012-05-23
000004489 100__ $$aCao, Zijun
000004489 24500 $$aExpanded Reliability-based Design for Spread Foundations

000004489 24630 $$n5.$$pProceedings of the 5th Asian-Pacific Symposium on Structural Reliability and its Applications
000004489 260__ $$bResearch Publishing, No:83 Genting Lane, #08-01, Genting Building, 349568 SINGAPORE
000004489 506__ $$arestricted
000004489 520__ $$2eng$$aDesign is a process of determining a set of parameters that describe and specify a geo-structure (e.g., spread foundation) that satisfies a series of performance requirements, including the ultimate limit state (ULS), serviceability limit state (SLS), reliability and economic requirements. This paper presents a general reliability-based design (RBD) approach for foundations that addresses, explicitly and simultaneously, the ULS, SLS, reliability and economic requirements (Wang et al. 2011 and Wang 2011). The design process is formulated as an expanded reliability problem (Au 2005) that is evaluated by a single run of Monte Carlo simulation (MCS). The expanded reliability-based design (i.e., expanded RBD or RBD<sup>E</sup>) approach with MCS is illustrated through a design example of a spread foundation with a fixed depth that has been used for the evaluation of Eurocode 7 (Orr and Breysse 2008). The results are consistent with those from previous reliability analysis reported in literature. In addition, the expanded RBD approach with MCS addresses the Eurocode 7's reliability requirement explicitly and simultaneously with the ULS and SLS requirements, and it leads to a design that satisfies both the ULS design target failure probability PT<sup>ULS</sup> = 7.2X10<sup>-5</sup> and SLS design target failure probability PT<sup>SLS</sup> = 6.7X10<sup>-2</sup> in Eurocode 7. A design calculation using the expanded RBD approach with MCS is equivalent to a sensitivity study on failure probability P<sub>f</sub> versus the design parameters. These results provide additional insights into how the expected performance level of spread foundations changes as design parameters change. They also allow design engineers to adjust target failure probability P<sub>T</sub>, without additional computational efforts, to accommodate specific needs of particular projects, such as failure consequences. Such adjustment is not possible for current RBD approaches, without re-calibration of partial factors, although it is common in traditional allowable stress design (ASD) practice where the design factor of safety (FS) can be adjusted, where and when warranted.

000004489 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004489 653__ $$aUncertainty, Foundations, Reliability-based design, Limit states, Simulation.

000004489 7112_ $$a5th Asian-Pacific Symposium on Structural Reliability and its Applications$$cSingapore (SG)$$d2012-05-23 / 2012-05-25$$gAPSSRA2012
000004489 720__ $$aCao, Zijun$$iWang, Jingmei$$iWang, Yu
000004489 8560_ $$ffischerc@itam.cas.cz
000004489 8564_ $$s154550$$uhttps://invenio.itam.cas.cz/record/4489/files/P139.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004489 962__ $$r4180
000004489 980__ $$aPAPER