Compressed Structures Modeling of Hard Protection Constructions of Solid Section With Spiral Reinforcement (Part 2)

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Rubric:     Theoretical and experimental studies   
Annotation:

The author produces main points of physics modeling experimental research of rod-shape elements of solid section of hard shield constructions with spirals during statistical pressure and all results are analyzed. Considerable increase of axial strain (not less than in 2-3 times) is detected. The author studies peculiarities of changes of strained and deformated condition during elastic, elasto-plastic and plastic stage of destruction. Two types of destruction are discovered: first is connected with clamps (µcir > µx) breach and second – with spirals (µx > µcir) at reaching maximum and minimum strength respectively. The author suggests limiting condition on beam strength to normalize to deformed criteria which are settled on typical points of diagrams ?-? of helical reinforced concrete. The structure of strengthening and deformability indicators is defined and consists of 3 components: contribution of the concrete and two additives from its cogging by spirals and clamps.