Bridges for Service Life Beyond 100 Years: Service Limit State Design (2014) / Chapter Skim
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48 C h a p t e r 3 3.1 Introduction The new generation of bridge design codes is based on probabilistic methods. Load and resistance (load-carrying capacity)
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49 state equation must be developed on the basis of a prescribed failure mechanism. The limit state equation should include all the parameters that describe the failure mechanism and that would normally be used to carry out a deterministic design of the structure or structural component.
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50 5. Develop the reliability analysis procedure.
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51 Calibration framework Calculate the reliability indices for current design code or current practice Select structural types and design cases Determine load parameters for selected design cases Determine resistance parameters for selected design cases Develop statistical models for loads and load combinations Develop statistical models for resistance variables Statistical parameters of loads Statistical parameters of resistance Formulate the limit state function Experimental data Engineering judgment β ≈ βT End of the calibration procedure Load survey Experimental data Observations Develop the reliability analysis procedure Review the results and select the target reliability index, βT Select potential load and resistance factors Calculate reliability indices Modify potential load and resistance factors List obtained load and resistance factors No Yes Figure 3.1. Flowchart of basic calibration framework.
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52 Sometimes, R - Q is termed M, the margin of safety. Using this terminology, b is given by Equation 3.5: (3.5)
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53 randomly from these distributions. For example, for the simple load combination of dead load plus live load, random values of dead load and live load are chosen from the normal distributions fitted in the region of interest.
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54 Table 3.1. Statistical Parameters of Component Resistance Type of Structure Material and Fabrication Factors (M and F)
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55 3.4 Customizing the process The data used in the calibration described in this report are provided in Appendix F The key to providing the ability for owners to adjust the calibration of the SLSs for their own experience is to either adjust the data in Appendix F or supply state-specific information of the same type.
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