Abstract
An effect of structural and technological features on the design methodology of hyperstatic precast reinforced concrete and composite steel‐concrete structures is discussed. Permanent and variable service, snow and wind loads of buildings and their extreme values are analysed. Two loading cases of precast reinforced concrete and composite steel‐concrete continuous and sway frame beams as propped and unpropped members are considered. A redistribution of bending moments for the ultimate limit state of beams is investigated. A limit state verification of hyperstatic beams by the partial factor and probability‐based methods is presented. It is recommended to calculate a long‐term survival probability of beams by the analytical method of transformed conditional probabilities.
Highlights
Composite steel-concrete structures and their construction technique utilise distinct advantages of steel and concrete components using the properties of materials as defined in Eurocode 2 [1] and Eurocode 3 [2]
Hyperstatic composite and concrete systems of buildings and similar construction works exposed to extreme gravity and lateral actions belong to highreliable structures
The analysis of hyperstatic reinforced concrete and composite steel-concrete structures subjected to action effects caused by service and climate actions depends on the features of structural concepts and construction technologies
Summary
Composite steel-concrete structures and their construction technique utilise distinct advantages of steel and concrete components using the properties of materials as defined in Eurocode 2 [1] and Eurocode 3 [2]. Real proposals, recommendations and specific features considering the effect of construction technology on structural safety of buildings are passed over in silence. This shortage is visually revealed in the analysis of the load-carrying capacity and safety of continuous beams and frames with propped and unpropped members. It is difficult to assess quantitatively the reliability of hyperstatic systems and their members by deterministic design code recommendations. The purpose of this paper is to turn an attention of structural engineers to design features of hyperstatic structures consisting of propped and unpropped members and to encourage designers having a minimum appropriate skill and experience to use the probability-based methods in their design practice
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