Earthquake Analysis - Shear Walls

Introduction

The following tutorial focuses on the SSD workflow for the analysis of shear walls within the scope of earthquake analysis.

The analysed structure is modelled in Revit 2020 and the finite element model is generated by using SOFiSTiK Analysis + Design for Revit 2020.

Shear walls are modelled with quad elements. Furthermore, design elements are assigned to the shear walls within the Revit model. They provide for a fully automatic interpolation and integration of quad internal forces for the corresponding shear walls` cross sections; thus, enabling a straight-forward assessment and further design on the basis of cross-sectional forces.

For more information about the definition of design elements in Revit 2020, please see the following tutorial: Generation of Design Elements for Shear Walls.

For additional infomation on the earthquake analysis with the Response Spectrum Analysis (RSA), please check the following tutorial: Earthquake Analysis with RSA.

Project Description

Please see the following project information before setting up the project files. The modell is based on the example given in “Eurocode 8: Seismic Design of Buildings Worked examples” by Bisch et al, 2011.

Materials

Number

Material

Strength

1

concrete

C 25/30

3

reinforcement steel

S 500

Cross Sections

Number

Element

Dimension

1

Columns C7-C10

B/H = 50/50 cm

2

Columns C12-C15

B/H = 40/70 cm

3

T-Beam

B/H/Bw/Hf = 195/50/25/18 cm

4

T-Beam

B/H/Bw/Hf = 220/50/25/18 cm

5

Columns C1-C6, C11-C16

B/H = 30/70 cm

6

Edge Beams

B/H = 25/50 cm

7

Walls W3, W4 (design element)

B/H = 25/400 cm

8

Wall N1B (design element)

B/H = 25/168 cm

9

Wall N1A (design element)

B/H = 25/335 cm

10

Wall N1C (design element)

B/H = 25/168 cm

11

Walls W1, W2 (design element)

B/H = 30/400 cm

Geometry

../../_images/cross_section.svg../../_images/section_A.svg../../_images/section_B.svg

Loads

LC Number

Title

Loads

1

Self Weight

automatic generation

10

Additional dead load

g1 = 2.00 kN/m² (100% mass active)

30

Live Load

q1 = 2,00 kN/m² (30% mass active)

36

Roof live load

q2 = 2,00 kN/m² (30% mass active)

The following picture shows the load cases and load values defined on the structure.

../../_images/loads1.png

For the Response Spectrum Analysis the following values will be used:

Response Spectrum according Eurocode

Type 1 –> EC-1

Type of Spectrum

Design Spectrum

Acceleration

Ag = 2.5 m/s²

Soil Class

B

Behaviour factor

3.0

SSD Workflow - Earthquake analysis of Shear Walls

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