Software system dPIPE 
CVSpec-TH program is intended for developing and processing data used for seismic input in form of generated accelerograms and seismic response spectra.
Seismic design common practice assumes use of response spectra as input data for seismic loads. Such approach is justified in connection with Response Spectrum Method calculations. However some tasks require considering different nonlinear effects or non-proportional damping. In such cases Time History Analysis method is applicable for solving of the structure motion equations in the time domain. In that case seismic input is represented by an acceleration time-dependent record, called accelerogram or time history. The program is equipped with all necessary options for handling the Response Spectra: developing of Response Spectra from the Accelerograms according to the given set of damping and vice versa; scaling; interpolation of accelerations for given range or set of frequencies; interpolation of accelerations for intermediate values of damping; mutual recalculation of accelerations/velocities/displacements spectra; enveloping; statistical operations; options required by different Regulations.
CVSpec-TH is specialized software developed for Mechanical and Structural Engineers and used as a powerful tool for developing and processing of Accelerograms and Seismic Response Spectra.
- The program equipped with all necessary options for handling the Response Spectra:
- developing of Response Spectra from the Accelerograms according to the given set of damping;
- scaling;
- interpolation of accelerations for given range or set of frequencies;
- interpolation of accelerations for intermediate values of damping;
- mutual recalculation of accelerations/velocities/displacements spectra;
- enveloping;
- statistical operations, including:
- averaging of spectral accelerations;
- median + sigma processing
- options required by different Regulations:
- peak broadening;
- valley flattening;
- ASME BPVC Code Case N-411-1 cross-spectral damping interpolation
- Generation of accelerograms compatible with given Response Spectra:
- ZPA correction;
- baseline correction;
- automatic check of the frequency range and time/frequency step;
- control of errors in the different frequency domain.
Envelope Spectrum
Average Spectrum
Peak Broadening
Generation of accelerogram:
A specific feature of the CVSpec-TH is ability to work with huge set of data in conjunction with flexible interface for import of input data and export of results
CVSpec-TH can be used as integrated software within dPIPE, as well as stand-alone application
Integration with dPIPE:
- CVSpec was developed based on the recommendations taken from the wide set of Normative and general Seismic Engineering Literature Sources:
- NP-031-01. Regulations for NPP Seismic Design, Russia
- RB-006-98. Safety Guide. Determination of the Initial Seismic Ground Motion for Design Basis.
- SNiP II-7-81, Construction in Seismic Areas
- RD 10-249-98, Strength Design Code for Stationary Boilers and Steam and Hot Water Piping
- US NRC RG 1.60. Design Response Spectra for Seismic Design of Nuclear Power Plants. Rev.1. 1973.
- US NRC RG 1.122. Development of Floor Design Response Spectra for Seismic Design of Floor-Supported Equipment or Components. Rev.1. 1978.
- US NRC SRP 3.7.1. Seismic Design Parameters. NUREG-0800, Rev.2.
- ASCE 4-98. Seismic Analysis of Safety-Related Nuclear Structures and Commentary on Standard for Analysis of Safety-Related Nuclear Structures.
- ASME BPVC Case N-411-1 and Appendix N of ASME BPVC. 1998;
- A.N. Birbraer, Seismic Analysis of Structures