Classification of Self-stressed Steel-Concrete Composite Structures

Abstract

The essence of building structures preliminary stressing is the creation of internal stresses in them, opposite to those that arise during operation. The creating of initial stresses in building structures from their own weight greatly simplifies the pre-stressing process due to the unnecessary spending on additional measures and adaptations. Preliminary stresses in this case can be created due to the well-chosen nodes sizes and the development of technology for building structures preliminary assembly. In this sense, the term “self-stress” is used in this work. As is known, steel—concrete composite structures are made of successfully combined steel mainly rod elements and monolithic concrete. The creation of pre-compression of concrete in steel—concrete composite structures will have a positive effect on increasing their overall load-bearing capacity. In this work the classification of self-stressed steel—concrete composite structures depending on the method of pre-stresses creating in them and the type of deformed state on which these structures will work in the frame of the building. Preliminary self-stresses in steel—concrete composite structures can be created by the following measures: using the stressing cement for concrete mortar preparation, prediction of constructive measures for additional compaction of fresh concrete mortar (centrifugation) or for the hardened concrete pre-compression, constructive tension of the external reinforcement (sprung), changing the cross section geometric characteristics or the design scheme of the elements work in the manufacturing process, specially developed step-by-step technology of constructions manufacturing.