Design of Concrete Structures with Stress Fields - download pdf or read online


By Dr. A. Muttoni, Dr. J. Schwartz, Prof. Dr. B. Thürlimann (auth.)

ISBN-10: 3034890478

ISBN-13: 9783034890472

ISBN-10: 3034898851

ISBN-13: 9783034898850

17 2 tension FIELDS for easy constructions 2. 1 advent during this bankruptcy the habit and energy of easy constructions made up of rein­ compelled or prestressed concrete is investigated through tension fields. particularly, the webs and flanges of beams, uncomplicated partitions, brackets, bracing beams and joints of frames are investigated. by means of this suggests, nearly all of layout instances are already lined. in truth, all structural parts are third-dimensional. right here, in spite of the fact that, parts are thought of both without delay as two-dimensional plate parts (i. e. the aircraft rigidity situation with out edition of tension over the thickness of the point) or they're subdivided into a number of plates. due to the fact two-dimensional structural components are statically redundant, it's attainable for a specific loading to be in equilibrium with many (theoretically an enormous variety of) pressure states. If the decrease certain approach to the speculation of plasticity is hired, then an admissible pressure box or any mixture of such pressure fields could be chosen. In bankruptcy four it's proven that this technique is appropriate for the layout of bolstered concrete constructions, and the final result of the alternative of the ultimate structural procedure at the structural habit is handled intimately. the 1st situations of using this technique date again to Ritter [6] and Morsch [4], who already in the beginning of the century investigated the resultants of the inner stresses via truss models.

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Extra resources for Design of Concrete Structures with Stress Fields

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Large departures from this solution have no marked influence on the serviceability. Solutions wIth either very large or very small compression field inclinations should, however, be avoided. 1. In structural codes normally a range is given, in which a free choice is possible. It is evident from Fig. 27 that the inclination of the compression field also has an influence on the intensity of the stress in the concrete. For highly stressed webs ~ must be chosen so that the effective strength of the concrete is not exceeded.

49: ---- Loading of the diaphragm Oe 20 54 Stress Fields for Simple Structures The forces acting on the individual plates as well as the corresponding stress fields are shown in Fig. 50. Fig. 50: Loading and stress fields in the flanges The shear flow in two neighboring plate edges do compensate each other within the span region but not in the loading and support regions. Thus stringers loaded in tension result, which, if a cross-section is considered, maintain equilibrium with the longitudinal components of the inclined compression fields.

3 is considered, but with the span doubled. The loads are still 800 kN (ultimate limit state) and act at one quarter of the span from the supports. 1 can be applied qualitatively for this case too (Fig. 14). 2O MPo \) 1600kN 1600 800kN Fig. 6°. Experimental investigations have shown that this stress field can only develop under certain conditions. e. if they intersect at a relatively small angle. Thus, alternative solutions with more steeply inclined struts are sought. Fig. 15 shows how the problem can be solved by combining two structural systems.

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Design of Concrete Structures with Stress Fields by Dr. A. Muttoni, Dr. J. Schwartz, Prof. Dr. B. Thürlimann (auth.)

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