Load Combination for Assessment
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Define the ULS and SLS load combinations to be used for the assessment checks using the result output from different type of analysis, i.e., construction stages, static analysis, moving loads, etc. |
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From the Main Menu select Rating > Bridge Rating Design > CS454/19 > PSC Bridge > Load Combinations for Assessment |
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A list of load combinations to be used for assessment Name Assign name to the load combination. Limit State Specify whether this load combination should be used for ULS or SLS assessment. Combination Type Specify the combination type with reference to the combinations 1 to 4 as set in CS454/19 (See Appendix A). Gamma_f3 Specify the partial factor for load effects to be used for the given load combination. Description Add any comments relevant for the load combination. Copy into Assessment Load Combination Create a new load combination that is a copy of an existing one. Copy into General Load Combination Copy selected load combination from this list (Load Combinations for assessment) to the General Load Combinations (Results> Load Combinations> General). This function can be used to check results for given Assessment Load Combinations as these combinations are not directly available to checks results in the GUI or table results. Each load combination copied will generate three cases in the general load combination as below:
List the load cases and output which should be included in the combination Static Load Cases Choose the relevant load cases and output to be included in the load combination. Factor Set the factor to be used for each load case in the given load combination.
Select the moving load case to be included in the combination and the factors for the same. Auto MVL Case Select this option when 'Auto Live Load Combination' is used in a moving load case with ALL Model 2 from CS454/19 and special vehicle form BD86. For these load cases, the software will calculate the contribution of the special vehicle and the associated standard vehicle and calculate the reserve factors accordingly for the assessment checks. For such load cases, the Auto Live Load Combination is switched on and the partial factors for load effects gamma_fL are included in the moving load case analysis. For this reason, the factor section is locked and set to 1, in order not to double count the gamma_fL factor. Other MVL Case Under this option, any moving load case in which the Auto Live Load Combination is switched off can be used in the combination. Generally, this can be used when assessment check is performed by any special vehicle alone. Therefore, the reserve factor is calculated for the special vehicle and not for the accompanying standard vehicle. For this option, the factor is unlocked and the partial factor (gamma_fl) for live load needs to be specified.
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