Reliability-Based Load Criteria for Structural Design: Load Factors and Load Combinations

Issam M. Assi


The safety problem in structural engineering can be treated more rationally with probabilistic methods. These methods provide basic tools for evaluating structural safety quantitatively. Uncertainties in loads, material properties, and construction practice, which have been traditionally dealt with by empirical safety factors, can be taken into account explicitly and consistently in probabilistic safety assessment. Based on such methods, this paper introduces a study conducted to develop reliability-based load factors and load combination suitable for use with common reinforced concrete structures in Jordan. The selection of a probabilistic methodology for performing the necessary reliability analysis and the collection and examination of statistical data on structural resistance and loads were involved. The checking equation format for the proposed load criteria was selected, and the load factors and load combinations were computed using a constrained optimization procedure. Comparisons of reliabilities obtained using the proposed procedure with existing criteria were made.


Reliability analysis; concrete; load; resistance; combinations

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