Ellen M. Laase
i Senior Consulting Engineer, Simpson Gumpertz & Heger, Inc., Waltham, Massachusetts, USA, emlaase@sgh.com
ABSTRACT
Designing stone dutchman repairs requires a nuanced approach to ensure long-term durability and stability. A successful stone dutchman repair must consider many factors, including material compatibility, precise workmanship, and effective reinforcement. Dutchman repairs in stones within the field of the wall are typically not structurally challenging to design or implement, in that the gravity loads within the loadbearing walls have alternative load paths both around the repair and behind the partial depth. However, through-depth dutchman repairs in slender linear elements such as window mullions and columns present additional challenges that are discussed herein. This paper will explore stone dutchman repair considerations, including additional considerations when the dutchman repairs are located within slender linear elements such as vertical mullions between windows and must resist gravity loads and magnified wind loads imparted from the adjacent windows. The paper will present how to design an effective repair when the dutchman repair is full-depth with no alternative load path around or behind the repair. By exploring the multiple considerations for dutchman repairs, particularly at slender elements, the paper will explain the complexities of dutchman repairs in historic masonry and offer insights into designing repairs that are capable of resisting both gravity and lateral loading to ensure repairs that are durable, stable, and respectful to the building’s history.
KEYWORDS: Restoration, stone, dutchman.
167-Laase.pdf
