Reinforced Concrete Design Quiz

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Questions and Answers

Match the Eurocode 2 parts with their respective focus areas:

Part 1-1 = General rules and rules for buildings Part 1-2 = Structural fire design Part 2 = Bridges Part 3 = Liquid-retaining structures

Match the Eurocode 2 sections with their corresponding topics:

Section 3 = Materials Section 5 = Structural analysis Section 6 = Ultimate limit states Section 7 = Serviceability limit states

Match the basic principles with their descriptions relevant to ultimate bending strength:

Simplified stress-strain = Relationship may be used Concrete tensile strength = Considered as zero Plane sections = Remain plane after bending Perfect bonding = Concrete-to-steel rebar interface

Match the steel reinforcement properties with their values or descriptions according to Eurocode 2:

Maximum stress = Steel yield stress (500 MPa) divided by partial safety factor Modulus of elasticity = 200 GPa Partial safety factor consideration = Needed to obtain the design strength of steel Steel yield stress = $f_{yd}$ Signup and view all the answers

Match the concrete properties with their values or descriptions according to Eurocode 2:

Maximum stress for concrete = 85% of its compressive strength divided by partial safety factor Ultimate strain for concrete = 0.0035 Parabolic stress-strain behavior = Up to a strain of 0.002 Experimental data basis = Value of 0.0035 Signup and view all the answers

Match the structural element behavior with their description:

Load applied = Deformation occurred on the element will produce stress and strain Compressive Strength = 85% of its compressive strength divided by partial safety factor $\epsilon_{cu2}$ = 0.0035 Constant Stress = Increases While the strain increases Signup and view all the answers

Match the variable with its corresponding value based on the beam design example:

Design Action (w) = 49.5 kN/m Bending Moment (M) = 155 kNm Effective Depth (d) = 557 mm Concrete Compressive Strength (fck) = 30 N/mm² Signup and view all the answers

Match the calculated parameter with its formula used in the beam design:

Design Action (w) = $1.35g_k + 1.5q_k$ Bending Moment (M) = $wL^2/8$ Lever Arm (z) = $d[0.5 + (0.25 - K/1.134)^{1/2}]$ Reinforcement Area (As) = $M / (0.87f_{yk}z)$ Signup and view all the answers

Match the reinforcement area with its description:

Calculated tension reinforcement (As) = 688 $mm^2$ Provided reinforcement (3H20) = 943 $mm^2$ Minimum reinforcement area (Asmin) = 209 $mm^2$ Maximum reinforcement area (Asmax) = 6000 $mm^2$ Signup and view all the answers

Match the parameter with its corresponding formula:

K = $M / (bd^2f_{ck})$ $A_{s,min}$ = $0.26 (f_{ctm} / f_{yk}) bd$ $A_{s,max}$ = $0.04 A_c$ $K_{bal}$ = 0.167 Signup and view all the answers

Match the variable with its description in the context of reinforced concrete beam design:

b = Width of the beam h = Total depth of the beam C = Concrete cover d = Effective depth of the beam Signup and view all the answers

Match the following stress distributions with their corresponding conditions or applications:

Triangular stress distribution = Serviceability limit state Rectangular-parabolic stress block = Ultimate limit state Equivalent rectangular stress block = Simplified alternative at failure Linear strain distribution = Simple bending theory Signup and view all the answers

Match the failure modes in reinforced concrete beams with their characteristics:

Under-reinforced = Steel yields before concrete Balanced = Steel and concrete yield simultaneously Over-reinforced = Concrete fails before steel Ideal Reinforced = Steel and concrete are at the same capacity Signup and view all the answers

Match the following assumptions in reinforced concrete beam theory with their implications:

Concrete cracks in tension = Tension carried by reinforcement Plane sections remain plane = Linear strain distribution Tensile strength of concrete neglected = Simplified calculations Compressive strain limit = Concrete reaches maximum strength Signup and view all the answers

Match the following terms with their definitions:

Strain = Deformation of a material Stress = Force per unit area Yield Strength = Point at which material begins to deform permanently Failure = Collapse or break of the material Signup and view all the answers

What causes the concrete to crack during over compression?

0.0035 strain = Concrete starts to exhibit cracks Large Deformations = The assumption might not be acurate Triangular stress distribution = Stresses are proportional to strains Singly reinforced = Consist only tension reinforcement Signup and view all the answers

Match the descriptions with the type of bending they belong to:

Working Conditions = Serviceability limit state Compressive Strains = Design for the ultimate limit state Simplified Alternative = Equivalent rectangular stress block Bending Theory = Reinforced concrete Signup and view all the answers

Classify based on reinforced materials used:

Under reinforced = Steel Yields Balanced reinforcement = Steel Yields at the Same Time Over reinforcement = Not Allowed Singly Reinforced = Tension Reinforcement Signup and view all the answers

Match the phrase to their meanings, referring to bending in beams:

Tensile strains = Concrete will Crack All tensions = Carried By Reinforcement Tensile strength = Neglected Constant = Strains Signup and view all the answers

Match the following terms related to reinforced concrete beam design with their descriptions:

Singly Reinforced Beam = A beam reinforced only in the tension zone. Doubly Reinforced Beam = A beam reinforced in both the tension and compression zones. Balanced Section = A concrete section where concrete and steel reach ultimate strain simultaneously. Hanger Bars = Reinforcement bars arranged to form a cage-like structure. Signup and view all the answers

Match the following concepts with their descriptions in reinforced concrete design:

$F_{st}$ = Resultant tensile force in the reinforcing steel. $F_{cc}$ = Resultant compressive force in the concrete. d = Effective depth of the beam. h = The overall height of the beam. Signup and view all the answers

Match the reinforcement terminology to the definition:

$A_s$ = Area of tension reinforcement $A_s'$ = Area of compression reinforcement $A_{smin}$ = Minimum area of steel reinforcement required by code $A_{smax}$ = Maximum area of steel reinforcement allowed by code Signup and view all the answers

Match the components of determing the effective depth, $d$, of a beam.

Overall Height (h) = The total height of the beam from top to bottom. Concrete Cover (c) = The distance from the outer surface of the concrete to the reinforcement. Shear link diameter = Diameter of stirrups used for shear reinforcement. Tensile bar diameter = Diameter of the main reinforcing bars. Signup and view all the answers

Match the code variables to the definition:

fctm = Mean tensile strength of concrete fyk = characteristic yield strength of the reinforcement Ac = Area of concrete bd = effective area of the concrete Signup and view all the answers

Match the general descriptions of the location of forces within a reinforced concrete beam.

Tension Force = Develops in the reinforcing steel. Compression Force = Develops in the concrete. Neutral Axis = The point where strain is zero Shear Force = Develops throughout the link. Signup and view all the answers

Match the steps relating to singly beam design:

calculate action bending moment = This occurs when the design action & bending moment is not given. Calculating d is not given = effective depth, $d = \frac{\text{shear links diameter}}{2} \frac{\text{tensile bar diameter}}{2}$ shear link diameter = typical value is 10mm Tensile bar diameter = An example value used is 20mm Signup and view all the answers

Match the variables relating to reinforcement parameters, $A_{smin}$ and $A_{smax}$:

$A_{smin}$ = $0.26 (fctm/ fyk) bd$ $0.0013bd$ = A lower bound for $A_{smin}$ $A_{smax}$ = $0.04A_c$ Ac = $b \cdot h$ Signup and view all the answers

Match the role of 'K' in singly reinforced beam design to the constraint:

Unitless factor = Applies to the beam design 0.95d = Should be $\leq$ d = Is the design effective depth. The beam design = Should be less than or equal to 0.95d. Signup and view all the answers

Match the parameter relating to effective depth of concrete, 'd' .

d = Often not given calculate effective depth = effective depth, $d = \frac{\text{shear links diameter}}{2} \frac{\text{tensile bar diameter}}{2}$ Example effective depth = 440mm Signup and view all the answers

Flashcards

Reinforced Concrete (RC)

Concrete that is strengthened with steel reinforcement bars (rebar).

Eurocode 2

European standard for the design of concrete structures, covering general rules and specific applications.