# OS-E: 7000 Response Spectrum Analysis

Demonstrates the response of water filled elevated tank structure.

Response spectrum analysis is carried out to estimate the maximum response of a
structure for a transient event. On a modal space when a response spectrum is
specified as dynamic loading, estimate the maximum displacement and stresses as a
response of the spectrum.

## Model Files

Before you begin, copy the file(s) used in this example to
your working directory.

## Model Description

The finite element model, as shown in Figure 1 is constrained at the bottom of the
structure with all DOF’s fixed, modal damping with respect to natural frequency and
frequency dependent dynamic loads are applied on the structure.

**FE Model**- Element Types
- CTRIA3

The linear material properties are:

**Linear Material 1: STEEL**- Young's Modulus (E)
- 2.1e5 MPa
- Damping coefficient
- 0.02
- Density (Rho)
- 7.9e-9 t/mm3

**Linear Material 2: STEEL_SANDWICH**- Young's Modulus (E)
- 3e4 MPa
- Damping coefficient
- 0.02
- Density (Rho)
- 9e-10 t/mm3

## Results

The maximum response of the structure is analyzed for the transient loadings.