ASCE 31-03 PDF

I am repairing a steel frame parking structure substantial alteration due to scope which has a braced frame lateral system that does not meet current code, but is close. I have reread the code 3 times looking for an error on my part, but get the same conclusion. Obviously since the lateral system is not too far from meeting the current code, I was hoping to save the expense of seismic retrofit and assumed the standard would be somewhat relaxed compared to cuurrent code. Any ideas about what I missed or confirmation of the result would be appreciated. What are the site parameters for 1 second and for short term accelerations?

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I am repairing a steel frame parking structure substantial alteration due to scope which has a braced frame lateral system that does not meet current code, but is close. I have reread the code 3 times looking for an error on my part, but get the same conclusion. Obviously since the lateral system is not too far from meeting the current code, I was hoping to save the expense of seismic retrofit and assumed the standard would be somewhat relaxed compared to cuurrent code.

Any ideas about what I missed or confirmation of the result would be appreciated. What are the site parameters for 1 second and for short term accelerations? What live load mass is assumed and at what level? ASCE loads included 10 psf of live load, which was not included in the ASCE calculation, but calculates a pseudo seismic force of approximately 1.

Structure period is estimated at approximately 0. I forgot the effect of rho and the difference in mass in the ASCE calcs when I wrote the post, so the difference is more like a factor of 2. Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

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