##### Document Text Contents

Page 1

3

Analysis & Design of Reinforced Concrete

Buildings for Earthquake and Wind Forces

Page 2

COPYRIGHT

The computer program EngSolutions RCB and all associated documentation are proprietary

and copyrighted products. Worldwide rights of ownership rest with EngSolutions, Inc .

Unlicensed use of the program or reproduction of the documentation in any form, without prior

written authorization from EngSolutions, Inc., is explicitly prohibited.

Further information and copies of this documentation may be obtained from:

EngSolutions, Inc.

At: Dr. Ricardo E. Barbosa

8170 SW 29th Ct

Ft. Lauderdale FL 33328

Tel: (954) 370-6603

Fax: (954) 370-0150

www.EngSolutionsRCB.com

Email: [email protected]

© EngSolutions, Inc., 2000-2009

© Ricardo E. Barbosa, Ph.D. 1992-2000

http://www.engsolutionsrcb.com/

mailto:[email protected]

Page 100

94

The total weight of the building, computed from the load combination that was used to

determine the mass matrix (W = D0 + DL + 0.25 LL), is reported along with the static

base shear Vo in each direction. Press ENTER to accept the computed values. The

combined dynamic base shear cannot be smaller than Vo. The corresponding table is

shown in Figure 5.17.

• EngSolutions RCB reports in a table the Period T, for each mode of vibration and

the corresponding spectral acceleration Sa. In this table, the user may edit the values

of Sa. Hence, any response spectrum different from the code specified design

spectrum, includding the spectrum of a specific earthquake record, could be

considered in the spectral analysis. For our example we accept the spectral

acceleration obtained from the selected code. Click Next>>.

• A window is displayed, showing various methods of modal combination available,

including SAV, SRSS, CQC, ½(SAV+SRSS) and 0.25 SAV + 0.75 SRSS. For this

example select SRSS (square root of sum of squares) and click OK.

Figure 5.18. Design Base Shear

• EngSolutions RCB displays a table with the modal inelastic spectral acceleration

Sa/R, modal effective weight W’, and modal base shear Vm, for each mode and in

Page 101

95

each direction of earthquake loading. This table also shows, for each direction, the

Dynamic (combined) base shear, the Static base shear and the Design base shear,

which is the larger from of the previous values. The engineer may edit the value of

the design base shear. If the design base shear is different from the dynamic base

shear, EngSolutions RCB automatically scales the combined shears for all stories.

The design base shear for the example structure are: Vx = 731 kip and Vy = 590

kip.

• Click Next >>. Click Next >> again to accept the default values of accidental

eccentricity, which are the values specified in the selected seismic code (For ASCE

7-05, accidental torsion is 5% of the corresponding building dimension).

• A window is displayed asking which method to use to compute the center of rigidity

of each floor level. Select the option based on the fundamental mode shapes, and

click OK.

• Click OK to accept the default definitions of design eccentricity, which is the

appropriate for the selected seismic code. The design eccentricity is defined in terms

of the static (inherent) eccentricity (es distance from the center of mass to the center

of torsion), and the accidental eccentricity (δε). For ASCE 7-05 the design

eccentricities are: es + δε and es - δε.

• A table is displayed showing for the first definition of design eccentricity (es + δε), the

following data for each story and for each direction of earthquake loading: center of

mass, static (inherent) eccentricity, accidental eccentricity, and design eccentricity.

• Click Next >> to display the above data for the second definition of design

eccentricity (es - δε).

• Click Next >> to generate load case EQX. The program draws combined nodal

forces and displays a table showing for each story the resultant dynamic force,

accumulated shear, and accidental torsion. When the actual analysis is conducted,

the program solves the model for these combined forces, and based on the results,

establishes initial values and signs for displacements and element internal forces.

Then the program establishes the actual result envelopes from the spectral analysis.

• Click Next >> to generate load case EQY. The program draws combined nodal

forces and displays a table showing for each story the resultant dynamic force,

accumulated shear, and accidental torsion. When the actual analysis is conducted,

the program solves the model for these combined forces, and based on the results,

establishes initial values and signs for displacements and element internal forces.

Then the program establishes the actual result envelopes from the spectral analysis.

• The program produces a report with a summary of the earthquake loading definition.

This report can be printed with its own Print command, or it can be Saved as either a

text file (*.txt) or as an Eprint file (*.epr), which can latter be printed with program

Eprint. Users of Adobe Acrobat can print the report selecting as printer Adobe PDF,

to create a pdf file.

• Close the Report.

• Save the model.

Analyzing the Structure

To run the analysis

• Activate the Run Analysis command in the Standard toolbar or in the Analysis

menu.

Page 200

64

Guayanita Building, Caracas, Venezuela – Structural Engineer Solarte & Cia. S.A., Colombia

Special RC shear walls

Page 201

65

Orthodox Chapel, Bosque Real, Huixquilucan, Mexico – Structural Engineer Burela & Ortíz S.A. de

C.V.

Special moment-resisting-steel-frame system

3

Analysis & Design of Reinforced Concrete

Buildings for Earthquake and Wind Forces

Page 2

COPYRIGHT

The computer program EngSolutions RCB and all associated documentation are proprietary

and copyrighted products. Worldwide rights of ownership rest with EngSolutions, Inc .

Unlicensed use of the program or reproduction of the documentation in any form, without prior

written authorization from EngSolutions, Inc., is explicitly prohibited.

Further information and copies of this documentation may be obtained from:

EngSolutions, Inc.

At: Dr. Ricardo E. Barbosa

8170 SW 29th Ct

Ft. Lauderdale FL 33328

Tel: (954) 370-6603

Fax: (954) 370-0150

www.EngSolutionsRCB.com

Email: [email protected]

© EngSolutions, Inc., 2000-2009

© Ricardo E. Barbosa, Ph.D. 1992-2000

http://www.engsolutionsrcb.com/

mailto:[email protected]

Page 100

94

The total weight of the building, computed from the load combination that was used to

determine the mass matrix (W = D0 + DL + 0.25 LL), is reported along with the static

base shear Vo in each direction. Press ENTER to accept the computed values. The

combined dynamic base shear cannot be smaller than Vo. The corresponding table is

shown in Figure 5.17.

• EngSolutions RCB reports in a table the Period T, for each mode of vibration and

the corresponding spectral acceleration Sa. In this table, the user may edit the values

of Sa. Hence, any response spectrum different from the code specified design

spectrum, includding the spectrum of a specific earthquake record, could be

considered in the spectral analysis. For our example we accept the spectral

acceleration obtained from the selected code. Click Next>>.

• A window is displayed, showing various methods of modal combination available,

including SAV, SRSS, CQC, ½(SAV+SRSS) and 0.25 SAV + 0.75 SRSS. For this

example select SRSS (square root of sum of squares) and click OK.

Figure 5.18. Design Base Shear

• EngSolutions RCB displays a table with the modal inelastic spectral acceleration

Sa/R, modal effective weight W’, and modal base shear Vm, for each mode and in

Page 101

95

each direction of earthquake loading. This table also shows, for each direction, the

Dynamic (combined) base shear, the Static base shear and the Design base shear,

which is the larger from of the previous values. The engineer may edit the value of

the design base shear. If the design base shear is different from the dynamic base

shear, EngSolutions RCB automatically scales the combined shears for all stories.

The design base shear for the example structure are: Vx = 731 kip and Vy = 590

kip.

• Click Next >>. Click Next >> again to accept the default values of accidental

eccentricity, which are the values specified in the selected seismic code (For ASCE

7-05, accidental torsion is 5% of the corresponding building dimension).

• A window is displayed asking which method to use to compute the center of rigidity

of each floor level. Select the option based on the fundamental mode shapes, and

click OK.

• Click OK to accept the default definitions of design eccentricity, which is the

appropriate for the selected seismic code. The design eccentricity is defined in terms

of the static (inherent) eccentricity (es distance from the center of mass to the center

of torsion), and the accidental eccentricity (δε). For ASCE 7-05 the design

eccentricities are: es + δε and es - δε.

• A table is displayed showing for the first definition of design eccentricity (es + δε), the

following data for each story and for each direction of earthquake loading: center of

mass, static (inherent) eccentricity, accidental eccentricity, and design eccentricity.

• Click Next >> to display the above data for the second definition of design

eccentricity (es - δε).

• Click Next >> to generate load case EQX. The program draws combined nodal

forces and displays a table showing for each story the resultant dynamic force,

accumulated shear, and accidental torsion. When the actual analysis is conducted,

the program solves the model for these combined forces, and based on the results,

establishes initial values and signs for displacements and element internal forces.

Then the program establishes the actual result envelopes from the spectral analysis.

• Click Next >> to generate load case EQY. The program draws combined nodal

forces and displays a table showing for each story the resultant dynamic force,

accumulated shear, and accidental torsion. When the actual analysis is conducted,

the program solves the model for these combined forces, and based on the results,

establishes initial values and signs for displacements and element internal forces.

Then the program establishes the actual result envelopes from the spectral analysis.

• The program produces a report with a summary of the earthquake loading definition.

This report can be printed with its own Print command, or it can be Saved as either a

text file (*.txt) or as an Eprint file (*.epr), which can latter be printed with program

Eprint. Users of Adobe Acrobat can print the report selecting as printer Adobe PDF,

to create a pdf file.

• Close the Report.

• Save the model.

Analyzing the Structure

To run the analysis

• Activate the Run Analysis command in the Standard toolbar or in the Analysis

menu.

Page 200

64

Guayanita Building, Caracas, Venezuela – Structural Engineer Solarte & Cia. S.A., Colombia

Special RC shear walls

Page 201

65

Orthodox Chapel, Bosque Real, Huixquilucan, Mexico – Structural Engineer Burela & Ortíz S.A. de

C.V.

Special moment-resisting-steel-frame system