Beam Checking

Using the results obtained from the analysis of the entire structure and additional design data, automatically design concrete beam members according to the following design codes: American Concrete Institute (ACI318-89, ACI318-95, ACI318-99, ACI318-02 & ACI318-05), Canadian Standards Association (CSA-A23.3-94), British Standard (BS8110-97) and European Standard (ENV 1992-1-1:1992 & EN 1992-1-1:2004).

Architectural Institute of Japan (AIJ-WSD91), Architectural Institute of Korea (AIK-USD94), Korean Society of Civil Engineers (KSCE-USD96), Korean Concrete Institute (KCI-USD99), Architectural Institute of Korea (AIK-WSD2K), China Standard (GB50010-02) and Indian Standard (IS456:2000) are available upon request.

The Beam Checking module checks serviceability as per Eurocode 2.

Note
As for how to check serviceability, refer to [Procedure for Serviceability Check as per Eurocode 2] at the bottom of the page.

Serviceability check is performed as per EN 1992-1-1:2004. Deflection is checked on the basis of the elastic analysis results (Note that deflection check is not based on the plastic section with the concrete crack taken into account).

From the Main Menu select Design > Design > RC Design > Concrete Code Check > Beam Checking.

Shortcut key : [Ctrl]+5

The strength verification results sorted by elements are based on the maximum negative and positive moments and shear forces calculated at the positions (I, M & J) of each element in accordance with the load combinations for concrete design.

The strength verification results sorted by properties are based on the maximum results obtained by considering all the elements and sectional locations pertaining to each section property in accordance with the load combinations for concrete design.

The results appear in blue when the strength verifications for the given section properties and rebars are satisfactory, otherwise they appear in red.

Strength verification can be performed by automatic design or by using the information on main rebars (diameter, number), sub-rebars (diameter, number) and design parameters entered by the user.

Strengths cannot be verified without the rebar data.

The strength verification results are produced in the unit system selected by the user.

Parameters of Beam Checking Result Dialog Box:

MEMB : Member number

PROP: Section property number

Span: Length of beam member

Section: Section name

SEL: Select members for strength verifications and production of results

Section : Section name

Bc, Hc: Width, height (depth) of beam member

bf, hf: Width, thickness of the flange of T-shape section

f'c: Design compressive strength of concrete

fy: Design yield strength of main rebars

fys: Design yield strength of shear rebars

POS: Strength verification positions (I,M,J)

The design results for M reflect the strength verification for the maximum negative and positive moments and shear forces at 1/4,

1/2 & 3/4 points.

CHK: Status of strength verification results

= "OK": Strength verification results satisfy the design strength for the factored negative moment, positive moment and shear

force

= "N**": Strength verification results do not satisfy the design strength for the factored negative moment

= "*P*": Strength verification results do not satisfy the design strength for the factored positive moment

= "**V": Strength verification results do not satisfy the design strength for the factored shear force

= "NP*": Strength verification results do not satisfy the design strength for the factored negative and positive moments

= "*PV": Strength verification results do not satisfy the design strength for the factored positive moment and shear force

= "N*V": Strength verification results do not satisfy the design strength for the factored negative moment and shear force

= "NPV": Strength verification results do not satisfy the design strength for the factored negative moment, positive moment and

shear force

AsTop: Steel area of the top main rebars entered by the user or updated by in the automatic design.

AsBot : Steel area of the bottom main rebars entered by the user or updated by in the automatic design.

N(-)Mu or N(-)M_Ed, LCB: Maximum factored negative moment occurring in the relevant element or section and the corresponding load combination.

x/d: Ratio of neutral axis depth to effective depth.

N(-)phiMn or N(-)M_Rd: Maximum negative design moment strength calculated for the given section dimensions and rebar placement of the beam member.

Rat-N: Factored negative moment / Negative design moment strength, which shows in red if it exceeds 1.0

P(+)Mu or P(+)M_Ed, LCB: Maximum factored positive moment occurring in the relevant element or section and the corresponding load combination.

P(+)phiMn or P(+)M_Rd: Maximum positive design moment strength calculated for the given section dimensions and rebar placement of the beam member.

Rat-P: Factored positive moment / Positive design moment strength, which shows in red if it exceeds 1.0

Vu or V_Ed, LCB: Maximum factored shear force occurring in the relevant element or section and the corresponding load combination.

phiVc: Concrete design shear strength for the beam member

ACI318-89, ACI318-95, ACI318-99 & ACI-02, Vc = (unit: lb/in2)

BS8110-97, concrete shear stress vc =

Allowance has been made in these figures for a of 1.25.

where, should not be taken as greater than 3, should not be taken as less than 1.

For characteristic concrete strengths greater than 25 N/mm2, the values may be multiplied by . The value of

should not be taken as greater than 40.

Eurocode2, concrete shear strength VRd1 =

where, = basic design shear strength = should be taken as 1.5. = 1 for members where more

than 50% of the bottom reinforcement is curtailed.

otherwise, (d in metres)

= the area of tension reinforcement extending not less than beyond the section considered.

= minimum width of the section over the effective depth.

V_Rdc: Shear strength by concrete section only (without shear reinforcement).

V_Rds: Shear strength by rebar.

Rat_Vc: V_Ed/V_Rdc.

Rat_Vs: V_Ed/V_Rds.

AIK-USD94, Vc = (unit: kgf/cm2)

KSCE-USD96, Vc = (unit: kgf/cm2)

KCI-USD99, Vc = (unit: kgf/cm2)

Rat-V: Factored shear force / Design shear strength, which shows in red if it exceeds 1.0.

Ast,req, Ast,use:  Required transverse reinforcement or used transverse reinforcement for torsion.

Asl,req, Asl,use:  Required longitudinal reinforcement or used longitudinal reinforcement for torsion.

Rat-TV: Design ratio for combined effect of torsion and shear.

Common Control

 : Display the applicable code for strength verification.

"Sorted by Element" displays the results of strength verification for the maximum factored negative moment, positive moment and shear force at the sectional locations (I,M & J) extracted from all the load combinations.

"Sorted by Property" displays the results of strength verification of the member producing the maximum factored negative moment, positive moment and shear force at the sectional locations (I, M & J) representing all the elements attributed to the relevant section property. Since the results do not pertain to a single element, ELEM (element number) is "0".

Once property is selected, SEL controls all the elements attributed to the same section properties.

 : Display the unit system selected by the user.

 : Select all members

 : Cancel the selection of all members

Re-verify the strengths of the selected members. When the strength re-verification is executed from the results displayed by section properties all the elements attributed to the same sections are included.

 : Display detail strength verification results

 : Display simplified strength verification results

 : Select the sectional location data to be included in the output.

 : Produce the strength verification results in summary calculations for the selected members.

 : Produce the strength verification results in detail calculations for the selected members.

The design results "Sorted by Element" support the detail calculations.

 : Produce the summary list of strength verification results for the selected members.

"Sorted by Property" produces the results of the maximum quantity of rebars representing all the members of same properties.

"*" is displayed to the right of the output data when RatN, RatP and RatV exceed 1.0.

= All : Produce all the strength-verified results in the Checking Results dialog box

= OK : From the strength-verified results, display only the results that have met the design requirements(OK) in the Checking Results dialog box

= NG : From the strength-verified results, display only the results that have not satisfied the design requirements(NG) in the Checking Results dialog box

 : Check in the option to select and highlight the selected members in Model View.

 : Close the dialog box

Procedure for Serviceability Check as per Eurocode 2

1. Select the design code: Eurocode2

2. Generate load combinations as per Eurocode2

3. Enter the ratios of the modulus of elasticity of reinforcement to the modulus of elasticity of concrete for short-term and long-term, respectively

- The default value for short-term is Es/Ec.

- The default value for long-term is 2(Es/Ec).  

4. Assign/Confirm Serviceability Load Combination Type

Design > General Design Parameter > Serviceability Load Combination Type

5. Enter Serviceability parameters

Design > Concrete Design Parameter > Serviceability Parameters

6. Check Result Dialog: Select 'Serviceability'

Design > Concrete Code Checking > Beam Checking

       [Notation]

7. Check Graphic Results

When "strength"is selected, Strength checking results will be produced. When 'serviceability'is selected, Serviceability checking results will be produced.

8. Check Detail Results

Both 'Strength' and 'Serviceability' results are produced in the Detail Report.

Revision of Gen 2015 (v1.1)

Q1. How midas Gen calculates maximum deflection in a member in Service Limit State Check?