Blast Analysis SDOF Software
RCBlast is an easy to use yet powerful and intuitive blast analysis tool based on the single-degree-of-freedom (SDOF) approach. Developed for inelastic analysis of structural members subjected to blast-induced shock waves, RCBlast can quickly generate SDOF time histories and PI diagrams for user defined blast threats.
Dynamic SDOF Analysis
RCBlast generates SDOF displacement time-histories by direct numerical integration of the dynamic equation of motion using the average acceleration technique with a predictor-corrector scheme to accomodate nonlinear resistance functions. The user has the ability to input custom load–deformation functions (obtained from test data, hand calculations, or other sources), or they may utilize those computed within the structural analysis module for one-way reinforced concrete members. There are no limitations on the user-defined applied pressure–time history, Pr(t), and resistance curves. The program can handle both inbound and rebound displacements and can consider hysteretic behavior (both non-degrading and degrading stiffness hysteretic models are available) to determine post-peak member response. Finally, the program can account for multiple cycles of loading or pre-existing damage using an accumulated damage subroutine.
Blast Load Input
Blast loads can be input as a series of pressure-time data points defined by the user. The user may also specify the TNT equivalent explosive mass and stand-off distance and let RCBlast compute blast-pressure distribution automatically. Alternatively, the peak pressure and duration can be specified for use with a triangular blast load approximation.
Built-in Structural Analysis Module
RCBlast has the built-in capability to generate resistance functions for one-way reinforced concrete members. The program incorporates some advanced structural analysis phenomenon not considered by other tools, such as:
- Formation and progression of plastic hinging
- Member softening caused by post-peak behavior
- Ultimate displacement based on material properties
- Detailed material modelling
- Variation in axial load during response
Pressure-impulse diagrams can be generated for any resistance function, however simple or complex. The program assumes a triangular forcing function with peak applied pressure and a linearly decrease load-time function. The tool can consider both positive phase only, and positive and negative phase on the PI diagram.
Graphical User Interface
A graphical user interface (GUI) was developed to stream-line the analysis process. All parameters used in the solution of the dynamic equation of motion may be modified by the user within the GUI. Results are plotted on the screen, and the software has the capability to overlay plots of experimental results and theoretical predictions to facilitate data analysis. Program outputs are also made readily available for spreadsheet manipulations.
The RCBlast system requirements are as follows:
- .NET Framework 4.5.2
- Windows XP or greater
- 1Ghz CPU & 512 MB RAM
- 25 MB hard disk space