Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

This article reports on a 5-storey historic building which was completely cored to build a new one inside its historic façades. A bending resistant steel framework was installed inside the construction ground and tied positively with the façades to stiffen them during construction works. Vertical loads were taken by a jet grouting gravity retaining wall, which also acted as supporting system for the building pit. To carry lateral loads the framework was tied back into the ground by vertical and inclined pre-stressed anchors. Several months after installing the gravity walls, just after the end of the demolition works and after fully straining of the supporting system, cracks in the historic façade were detected as well as an inclination of the façade with a tangential deviation of 1:160. The tilting of the façade was induced by different vertical movements of the framework caused by an expansion process within the jet grouting material. Because of the ongoing expansion by means of delayed ettringite formation, it was necessary to dismantle the jet grouting structures.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Tilting of a Historic Façade During Construction Works – Geotechnical Cause and Effect on the Stiffening System

New York, New York

This article reports on a 5-storey historic building which was completely cored to build a new one inside its historic façades. A bending resistant steel framework was installed inside the construction ground and tied positively with the façades to stiffen them during construction works. Vertical loads were taken by a jet grouting gravity retaining wall, which also acted as supporting system for the building pit. To carry lateral loads the framework was tied back into the ground by vertical and inclined pre-stressed anchors. Several months after installing the gravity walls, just after the end of the demolition works and after fully straining of the supporting system, cracks in the historic façade were detected as well as an inclination of the façade with a tangential deviation of 1:160. The tilting of the façade was induced by different vertical movements of the framework caused by an expansion process within the jet grouting material. Because of the ongoing expansion by means of delayed ettringite formation, it was necessary to dismantle the jet grouting structures.