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Re: Seismic Upgrades of Unreinforced Masonry -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Seismic Upgrades of Unreinforced Masonry -Reply
- From: David Puskas <david_puskas(--nospam--at)bswintl.com>
- Date: Wed, 10 Feb 1999 08:19:52 -0600
** High Priority ** Mr. Martin; There are a number of accepted codes in regards to the seismic upgrade for existing unreinforced masonry buildings which entails the testing of the existing masonry for shear strength etc. A couple of potential design problems with these types of structures is A) foundations are inadequate to sustain the new and or existing gravity loads, B) the diaphragms often are needed to be strengthened for the revised loads. Care must be taken with regards to the connections of the new floor to the walls, vs. the braced frame with the relative stiffness ratio of the two elements. Depending on the test results of the existing masonry and existing foundations, etc, costs will many times exceed the budget. I would suggest having the testing and observation done to determine the extent of upgrade to the building so that the client will be aware of the potential costs. Dave Puskas BSW International
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