Reinforced Concrete
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STEEL REINFORCED CONCRETE IS A HIGHLY VERSATILE CONSTRUCTION MATERIAL.

IT IS ACTUALLY A COMPOSITE OF CONCRETE AND STEEL, WITH THE CONCRETE EFFECTIVELY RESISTING COMPRESSIVE STRESSES AND THE STEEL ACTING IN TENSION.  SINCE CONCRETE HAS DIFFERENT PROPERTIES IN COMPRESSION AND TENSION, A COMPUTER SIMULATION VIA FINITE ELEMENT ANALYSIS (FEA) IS CONSIDERED TO BE A NON-LINEAR PROCESS.  THIS SITUATION CAN NOT BE ANALYZED BY USING NORMAL LINEAR ELASTIC BRICK OR THIN PLATE/SHELL ELEMENTS.

MECHANICAL EVENT SIMULATION (MES) SOFTWARE FROM AUTODESKŪ IS CAPABLE OF ANALYZING REINFORCED CONCRETE, INCLUDING A FULLY CRACKED SECTION.

AN EXAMPLE OF MES IN ACTION:  A CONCRETE BEAM OF CROSS SECTION 12" WIDE BY 18" DEEP WITH TWO  REBAR IN THE TENSION FACE IS DESIGNED  TO SPAN SIMPLY SUPPORTED.

CONVENTIONAL (HAND) CALCULATIONS ARE BASED ON SEVERAL SIMPLIFYING ASSUMPTIONS INTENDED TO YIELD CONSERVATIVE DESIGNS.  THESE SUGGEST THAT THE REINFORCING STEEL STRESS LEVEL WILL BE ON THE ORDER OF 20 KSI AND THE CONCRETE COMPRESSIVE STRESS WILL BE ABOUT 1200 TO 1400 PSI.

CONVENTIONAL CALCULATIONS, HOWEVER, DO NOT CONSIDER CRACK FORMATION MECHANICS, TENSION STIFFENING, SHEAR AND TENSION TRANSFER ACROSS CRACK BOUNDARIES, AND MANY OTHER ASPECTS OF ACTUAL MECHANICS OF MATERIALS.

THE AUTODESKŪ ALGORŪ SUITE OF NON-LINEAR PROCESSORS IS CAPABLE OF MODELING THE ACTUAL BEHAVIOR OF REINFORCED CONCRETE.

1 - Algor Theory.jpg (2731521 bytes)    2 - Beam GA 1.jpg (88150 bytes)    

THE MECHANICAL PROPERTIES OF CONCRETE ARE INCLUDED IN THE PROGRAM, AND A SAMPLE BEAM IS DEFINED

 

3 - Reinforced Conc beam transparent.jpg (125960 bytes)    

REINFORCING STEEL IS EMBEDDED IN THE CONCRETE MATRIX (SHOWN HERE WITH CONCRETE TRANSPARENT)

 

4 - Concrete Bm stress and deflection.jpg (572253 bytes)    5 - Reinforced Conc beam rebar stress.jpg (143827 bytes)    6 - BEAM W STEEL STRESS & CONC STRESS.jpg (128586 bytes)    8 - Stress transfer cracked section.jpg (221373 bytes)

THE RESULTS OF THE MECHANICAL EVENT SIMULATION, SHOWING THE EFFECT OF CRACKED SECTION FORMATION, AND THE ULTIMATE CONCRETE AND STEEL STRESS LEVELS AGREEING WELL WITH CONVENTIONAL THEORY

ANIMATION OF ANALYSIS RESULTS    (CLICK THIS LINK, "SAVE TARGET AS" AND RUN FROM A SUBDIRECTORY -  12 MB AVI FILE DOWNLOAD)

 

MES ANALYSIS OF SUBGRADE INDUSTRIAL REINFORCED CONCRETE WALL WITH BACK FILL PRESSURE

FIG 1.JPG (86784 bytes)    FIG 2.JPG (175611 bytes)    FIG 3.JPG (118890 bytes)    FIG 4.JPG (156172 bytes)

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