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Rs1281 utah urm guide 1 THE UTAH GUIDE FOR THE SEISMIC IMPROVEMENT OF UNREINFORCED MASONRY DWELLINGS Utah Seismic Safety Commission Existing Buildings Committee Second Edition THE UTAH GUIDE FOR THE SEISMIC IMPROVEMENT OF UNREINFORCED MASONRY DWELLINGS Ut

THE UTAH GUIDE FOR THE SEISMIC IMPROVEMENT OF UNREINFORCED MASONRY DWELLINGS Utah Seismic Safety Commission Existing Buildings Committee Second Edition THE UTAH GUIDE FOR THE SEISMIC IMPROVEMENT OF UNREINFORCED MASONRY DWELLINGS Utah Seismic Safety Commission Existing Buildings Committee Second Edition The Utah Guide for the Seismic Improvement of Unreinforced Masonry Dwellings iii PREFACE This publication is prepared for information purposes to assist owners of unreinforced masonry URM dwellings homes in gaining a better understanding of the seismic improvement of their dwellings It is recommended that owners enlist the expertise of a Utah-licensed contractor or repair specialist prior to the implementation of the ?xes illustrated herein While several generalized dwelling types are addressed in this publication each home is unique and for greater assurance and reliability a Utahlicensed Professional Engineer and or Architect should be retained to design and detail speci ?cally tailored corrective measures This document is intended for general informational use by homeowners and small residential contractors and if any non-dwelling building or other non-residential commercial building repair is being considered the owner should certainly involve a Utah-licensed Structural Engineer This publication is not to be used as a construction document The agencies and businesses involved in the design and preparation of this publication accept no responsibility for rehabilitation work or any action taken based on information found in this publication Unreinforced masonry and lightly reinforced masonry dwellings were typically constructed prior to Beginning in the building codes began to introduce more signi ?cant seismic requirements Such dwellings were commonly constructed using solid masonry bearing walls without adequate steel reinforcing As a result URM dwellings lack the ductility required to absorb seismic energy in a signi ?cant earthquake Often the dwellings are quite brittle and lack proper attachment between the walls and roof preventing the roof from stabilizing the wall In multi-story dwellings the same concept applies to attachments between the oor and walls Because of these structural de ?ciencies URM dwellings can quickly fail during earthquakes and should not be expected to perform adequately during a large earthquake While it is impractical to make any dwelling earthquake proof the techniques shown in this publication are intended to generally improve the seismic performance of a URM dwelling Potential earthquakes have a wide range of magnitudes and other characteristics and it should be expected that damage can still occur even after the upgrading of URM structures Moderate magnitude earthquakes occur periodically and although minor damage is usually associated with these events they have been known to cause major damage High magnitude earthquakes such as above magnitude have been known to cause damage to even strengthened or partially-strengthened structures Generally the more seismic upgrade measures that are taken to improve any given structure the greater the potential reduction in damage due to the earthquake The purpose of this guide is to minimize the possibility of a catastrophic failure of a dwelling by the implementation of seismic upgrades all in an e ?ort to mitigate the loss of life during a major