CFVR7251 - Seismic margin in reinforced beam according to ACI 349-01
Check a reinforced concrete beam subjected to shear force
A beam which is fixed at the right and simply supported at left end has a rectangular reinforced concrete section and it is subjected to a uniform distributed load of 6.75 Mp/m.
The aim of this example is to obtain the scale factor for elastic (FSE) and permissible inelastic response (FSI) according to ACI 349 code.
Inelastic energy absorption factors for shear is 1.25.
Element types used in the model: BEAM3 Needed CivilFEM Modules: |
|
| Model Statistics | |
| Number of elements | 20 |
| Number of nodes | 21 |
| Number of civil materials | 2 |
| Number of cross sections | 1 |
| Number of shell vertices | 0 |
Log file: CFVR7251.DAT
!! FINISH ~CFCLEAR,,1 NomFile='CFVR7251' /TITLE,%NomFile%, SHEAR CHECKING ACCORDING TO HCLPF FOR ACI 349 ! ------------------------------------------------------------------------------------- ! Initial data ! ------------------------------------------------------------------------------------- ! CivilFEM SETUP ~CFACTIV,NUCL,Y ~UNITS,,LENG,M ~UNITS,,TIME,S ~UNITS,,FORC,MP ~CODESEL,EC3-92,ACI349,,,EC8-94 ! Preprocessor /PREP7 ! Parameters L=10 ! Length between supports, in m b=.3 ! Cross-section width in m. h=.5 ! Depth in m. Q=4.5 ! Uniform distributed load in Mp/m Q_NS = Q/8 Q_S = Q/2 ! Material Definition ~CFMP,3,LIB,CONCRETE,ACI,fc_4500 ~CFMP,4,LIB,REINF,ACI,fy_60000 ! Element Type Definition ET,1,Beam3 ! Element Type 1: 2D Beam ! Cross-section definition ~CSECDMS,2,REC,3,0.5,0.3 ! Reinforcement definition ~RNFDEF,2,1,4,4,,,0.6368E-02 ! Bot. reinf. for bending ~RNFDEF,2,2,4,2,,,0.2283E-02 ! Top reinf. for bending ~RNFDEF,2,SHEAR,4,,,.00128 ! Shear reinf. ! Code properties definition ~SECMDF,2,ACI349PR,REC ,,5e-002 ~SECMDF,2,ACI349PR,DUCT_SH ,,1.25,0,0,0 ! Beam & shell properties ~BMSHPRO,1,BEAM,2,2,,,3,,,,Beam property ! Model Construction MAT,3 N,1 ! Nodes input N,21,L FILL,1,21 E,1,2 ! Elements input EGEN,20,1,1,1 D,1, , , , , ,UX,UY ! Boundary conditions D,21, , , , , ,UY ~CFSAVE,%NomFile% FINISH /FILNAME,NON_SEISMIC ~CFRESUM,%NomFile% /SOLU SFBEAM,ALL,1,PRES,Q_NS SOLVE ! Calculation FINISH /FILNAME,SEISMIC ~CFRESUM,%NomFile% /SOLU SFBEAM,ALL,1,PRES,Q_S SOLVE ! Calculation FINISH /FILNAME,NON_SEISMIC /POST1 ! Postprocessor ~CFSET,,1,1 ! Read first load step ~CFFILE2,4,SEISMIC.RCV ! Shear in Y checking according to ACI 349 ~HCLPFCN,SHT,SHEAR,0, , ,1,,,,,,,,1,1 ~PLHCLPF,BEAM,FSE ~CFGET,FSE, ELEMENT, 1 ,RESULT , FSE, I, , , 1 ~CFSAVE,%NomFile% FINISH /FILNAME,SEISMIC_SCALED ~CFRESUM,%NomFile% /SOLU SFBEAM,ALL,1,PRES,Q_S*FSE SOLVE ! Calculation FINISH /FILNAME,NON_SEISMIC /POST1 ~CFSET,,1 ~CFFILE2,4,SEISMIC_SCALED.RCV ~HCLPFCN,SHT,SHEAR,0, , ,1,,,,,,,,1,1 !-------------------------------------------------------------------------------------- ! DATA CHECK !-------------------------------------------------------------------------------------- ! Data comparison number NComp = 2 NComp_ch = 0 ! Matrix dim. *DIM,LABEL,CHAR,Ncomp,1 *DIM,LABEL_CH,CHAR,Ncomp_ch,1 *DIM,VALUE,,Ncomp,3 *DIM,VALUE_CH,CHAR,Ncomp_ch,3 *DIM,TOLER,,Ncomp,2 ! Labels LABEL(1,1) = 'DUCT' LABEL(2,1) = 'FSE' ! Correct values VALUE(1,1)=1.25 VALUE(2,1)=1. ! Comparison ! CivilFEM data ~CFGET,VALUE(1,2),SECTION,2,ACI349PR,DUCT_SH ~PLHCLPF,BEAM,FSE ~CFGET,VALUE(2,2), ELEMENT, 20 ,RESULT , FSE, J, , , 1 ! Warning and error tolerances TOLER( 1, 1)= 1E-02 $ TOLER( 1, 2)= 1E-02 TOLER( 2, 1)= 5E-02 $ TOLER( 2, 2)= 5E-02 !-------------------------------------------------------------------------------------- ! Results comparison !-------------------------------------------------------------------------------------- COMPARA.MAC |
Results
| Label | Target | CivilFEM | Ratio | Tolerance |
| DUCT | 1.25 | 1.25 | 1.000 | 0.01 |
| FSE | 1 | 1 | 1.000 | 0.05 |
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