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VKI solver will be available as part of the Advanced Analysis option VKI in-core solver will be used for models with under 20,000 joints VKI out-of-core solver for models over 20000 joints The VKI in-core solver is 500 to 2,000 times faster than the STAAD solver The VKI out-of-core solver is between 50% and 100% as fast as the VKI in-core solver VKI solver is also good for dynamic analysis, master/slave models, and models requiring iterative solutions.Ĥ. Advanced Solver: In the STAAD.pro 2007 the user will have three types of solvers: 1. Load case results are the maximums over all of the frequencies.įigure 6: Steady state analysis outputs – Displacement vs. The joint displacement, velocity, or acceleration can be displayed as the response value versus frequency.
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This response consists of a series of Steady State responses for a list of frequencies. In addition, a Harmonic response can be calculated. The results are the steady-state response which is the absolute maximum of displacement (and other output quantities) and the corresponding phase angle after the steady state condition has been reached. There is an option to change the number of points between frequencies and an option to add frequencies to the list of output frequencies.įigure 5: Steady state analysis inputs in the STAAD.pro input file Output frequency points are selected automatically for modal frequencies and for a set number of frequencies between modal frequencies. Each global direction may be at a different phase angle. Ground motion or a joint force distribution may be specified. This steady state response can be computed without calculating the transient time history response prior to the steady state condition. Steady State Analysis: A structure will reach a steady state of vibration that will repeat every forcing cycle.
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In the current implementation of the pushover analysis, the user can provide hinge properties as per Table 5-6 and 5-7 of the FEMA 356 manual (Generalized Force-Deformation Relationship) and also enter the expected yield stress of steel.įigure 4: Hinge properties can be defined in the Loads tab in the modeling mode STAAD.pro's pushover analysis is currently only applicable to steel structures.
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The displacement diagram after 225 steps and the location of plastic hinges at the 11th step is shown in Figure 3 and 4 respectively.įigure 2: Node displacements at Step 220 in STAAD.pro 2006 Pushover Tabįigure 3: Location of Plastic Hinges in STAAD.pro 2006 Pushover Tab An example of the capacity curve is shown in Figure1. pushing the structure and plotting the total applied shear force and associated lateral displacement at each increment, until the structure or collapse condition.
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It is an incremental static analysis used to determine the forcedisplacement relationship, or the capacity curve, for a structure or structural element.įigure 1: Capacity Curve for a Structure in STAAD.pro 2006 Pushover Tab The analysis involves applying horizontal loads, in a prescribed pattern, to the structure incrementally, i.e.
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Pushover analysis is a static, nonlinear procedure using simplified nonlinear technique to estimate seismic structural deformations. Pushover Analysis: Pushover Analysis option will allow engineers to perform pushover analysis as per FEMA 356 : 2000 and ATC 40. The Advanced Analysis Module includes the four major features: 1.