This thesis focuses on the development and experimental verification of modeling approaches for the lateral force design of post-tensioned timber frame and wall buildings. Furthermore, experimental testing is required to verify the accuracy of these models. Therefore, accurate modeling approaches which define both the strength and deformation of post-tensioned timber buildings are required. Because timber buildings are often governed by deflection, rather than strength, this can lead to the exceedence of design displacement limitations imposed by New Zealand codes.
#Michael timber framer code
Current code provisions for seismic design are based on the strength of the structure, and do not adequately account for its deformation. The development of post-tensioned timber systems has created a need for improved lateral force design approaches for timber buildings. These systems incorporate large timber sections connected by high strength post-tensioning tendons, and timber-concrete composite floor systems, and aim to compete with existing structural systems in terms of cost, constructability, operational and seismic performance. At the University of Canterbury, new structural systems for commercial multistorey timber buildings have been under development since 2005. So, the wattle and daub construction was one long-hidden secret we uncovered, but I do wonder what other secrets this house may still hold.Currently there is a worldwide renaissance in timber building design. The timbers were dismantled and reassembled with most of the principal ones left in their original configuration. Michael believes that around 1750, the wattle and daub failed due to our horrible humidity. Wattle and daub construction is very common in the UK and other European countries but is very rare in our area. This is a type of construction in which vertical stakes, or wattles, are woven with horizontal twigs and branches and then daubed with a combination of clay, mud, and animal dung. Michael uncovered evidence that this home was built using the wattle and daub infill. He turned to me and said, “I have to change the date of this house.” Then he told me the original story and a half house likely dated to 1727. When Michael came to inspect the work, he carefully examined the posts and beams. They then reinforced the posts and beams with pressure treated lumber. At the end of September, our volunteers began to remove large sections of stucco to reveal the timber frame structure and stone infill. We received a grant from Visit Bucks County which helped pay for this effort. With the help of Michael Cuba, a plan was developed to stabilize this wall. Serious cracks developed in the stucco, and one corner of the wall was in need of repair. The WTHA was very concerned about the north wall of the house. When the results finally came back, we learned that one of the core samples dated to 1727 and could have come from the original build. We wondered what the results of the dendrochronology could reveal, but it would be several months before we received the findings.
I admit I was disappointed that it was rebuilt and dated after Tennent’s death, but I wasn’t going to give up. They suspected the house was totally rebuilt, possibly using materials from the original building and other structures, and dated to approximately 1750. In the meantime, Michael and Jeffrey Marshall toured the house examining every detail. Before he could take samples, our volunteers had to expose some of the timber structure inside the house. Dendrochronology involves analyzing wood samples and is one of several investigational means of dating a structure. We decided to have Michael collect core samples of wood to send to the Oxford Dendrochronology Lab in Oxford, England. Soon he involved Jeffrey Marshall, President of the Heritage Conservancy in Doylestown, PA. Michael was intrigued by what he saw when he examined the structure. In the summer of 2019, the William Tennent House Association began working with Michael Cuba, who is a timber framer and founder of Transom Historic Preservation Consulting. Somehow, I felt the house held a secret.” “I admit I was disappointed … but I wasn’t going to give up.
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