MasterFrame: Dynamic and Seismic - Overview
In addition to the static analysis methods available within Masterframe, the Dynamic and Seismic modules expand the analysis capabilities to allow structures to be analysed under time varying loadings. To analyse a model under dynamic model, the software uses a linear combination of the mode shapes of the model. The cornerstone of the dynamic module is, therefore, the assessment of the natural frequencies of the structure. To do, this the software carries out an eigenvector and eigenvalue analysis of the structural stiffness matrix.
The Dynamic module allows the analysis of the structure under footfall analysis of structures using either the approach given in SCI P354 "Design of floors for vibration: A new Approach", or using Concrete Centre publication "A design guide to footfall induced vibration of Structures". Both analysis methods will return Response Factors for the structure.
In addition, the Dynamic Module includes options to analyse a structure under a user defined Force Profile, which allows a user to define time varying loadings and apply them to specific nodes within a structure. Also included in the Dynamic module is the steady state analysis, which allows a structure to be analysed for sinusoidal loading which can be determined at a user input frequency, phase and amplitude and applied to nodes within the model. In both the Force Profile and Steady State analysis methods, the software can calculate snap shots of the nodal deflection or the member forces. These snap shots can then be included in a static analysis in Masterframe so that the effects of the dynamic loading are included in the design of the structure.
The Seismic Module expands the Dynamic Module to also include the Response Spectrum analysis for the seismic design of structures to Eurocode 8, IBC 2012, ASCE 7 and UBC 1997. The Dynamic module also includes a Base Acceleration design within the Dynamic module which allows user defined base accelerations to be defined from which nodal deflections and member forces can be calculated and then included in the static analysis within MasterFrame. The Seismic module also adds the option to carry out a lateral force method design within Masterframe, without the need for a dynamic analysis.