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St. Joseph County Public Library 307 South Michigan Street Page 2 • Extensive spider cracking and spalling of the terra cotta's glaze was observed throughout the fagade Proposed Structural Back-up Support System Two alternatives were developed conceptually to serve as a new structural back-up for the existing east wall and fagade while permitting demolition of the existing structure. Installation of a new structural back-up system would allow demolition of the existing building structure while maintaining the existing east exterior wall and terra cotta fagade in place. Steel Support Structure The fagade back-up steel support structure would be a moment resisting frame composed of ASTM A992 Structural Steel. The steel frame would be constructed inside the existing building to support the east wall prior to demolition of the remaining existing building. The structural steel could be either painted or enclosed with siding to protect it from the weather. The conceptual design of the Steel structure can be found on SK2 in Appendix C. The steel frame support structure has a preliminary estimated cost between $ 325,000.00 and $350,000.00. This estimate includes an allowance for added demolition costs to account for a controlled demolition process of the current building and construction of the new steel backup structure. This cost would be in addition to the current demolition project costs and does not address restoration of the existing fagade. Concrete Support Structure The concrete support structure would be a moment resisting frame of cast -in place concrete. Similar to the steel frame, the concrete frame would be constructed inside the existing building prior to demolition of the existing building. The conceptual design of the concrete structure can be found on SK3 in Appendix D. The concrete frame support structure has a preliminary estimated cost between $ 300,000.00 and $320,000.00. This estimate includes an allowance for added demolition costs to account for a controlled demolition process of the current building and construction of the new concrete backup structure. This cost would be in addition to the current demolition project costs and does not address restoration of the existing fagade. Conclusion In closing, we recommend steps be taken to address the loose tiles noted in the inspection if demolition of the building does not proceed in a timely manner. Feel free to call should there be any questions or to discuss any details further. i Troy A. Madlem, PE, MLSE Vice President i6it Engineering & Consulting Company 0 Copyright 2005. All rights reserved. Corau S.w t our CL 4 CommiLrunt to our CWnb