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  1. Jwiggins

    Converting 5% damped response spectrum to 2% damping

    The USGS spectral response graphs are all based off of 5% damping, however IEEE-693 (6.9) and ASCE 113 (5.6.2.1) for electrical substation design both state that a maximum damping value of 2% must be assumed for all structures. These structures are basically inverted pendulums supporting...
  2. Jwiggins

    Converting 5% damped response spectrum to 2% damping

    The USGS spectral response graphs are all based off of 5% damping, however IEEE-693 and ASCE 113 for electrical substation design both state that a maximum damping value of 2% must be assumed for all structures. Is there a good way to convert the USGS 5% damped response spectrum into a 2%...
  3. Jwiggins

    Finding Ss and S1 values for a structure with 2% damping

    The USGS spectral response graphs are all based off of 5% damping, however IEEE-693 and ASCE 113 for electrical substation design both state that a maximum damping value of 2% must be assumed for all structures. Is there any way to convert the USGS 5% damped response spectrum into a 2% damped...
  4. Jwiggins

    SAP2000: Cable geometry problem

    I've had troubles with SAP2000 cables as well. Have you tried using SAG10 and inputting the cable tensions as point loads on the structure?
  5. Jwiggins

    Cable Connection (Pulley/Roller)

    Dang... and here I thought it was a simple question... Is SAP seriously not capable of modeling a cable over a frictionless connection? Doesn't this happen pretty much all the time? Am really I the only one who has ever had this problem? Starting to regret purchasing this senselessly complex...
  6. Jwiggins

    Cable Connection (Pulley/Roller)

    I'm designing a simple guyed structure where the guy wires are strung across horizontal arms. Typically called a "Sidewalk" guy. The guy cable starts by attaching to the top of the pole and then drapes across a frictionless pulley on the extended horizontal arm before anchoring to the ground...

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