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UBC Theses and Dissertations

Reliability study of North American dimension lumber in the Chinese timber structures design code Zhuang, Xiaojun

Abstract

Reliability evaluation principles, procedures as applied in the Chinese timber structure design code were reviewed. The general method to establish the design values of Chinese wood strength properties was investigated. In particular, Chinese load information, including the statistical models and parameters, was analyzed. Also, the reliability associated with wood structural design requirements in Canada was studied. The emphasis was placed on the in-grade testing method, which is a more reliable method to get the lumber strength properties compared with small clear wood testing method used in China. Finally, Canadian procedures for establishing the design values of wood strength properties were reviewed. Using Chinese load information and Canadian in-grade testing data, reliability evaluations were conducted for the design values of common Canadian Species in the Chinese timber design code. These design values were previous soft converted from allowable stresses approved by the American Lumber Standards Committee. Reliability results were compared with the target reliability levels tabulated in the Chinese national unified reliability code. This reliability analysis was implemented by using the "RELAN" (Reliability ANalysis) program developed by Dr. R.O. Foschi of UBC. Recommendations were made to develop a formal reliability evaluation of the performance of North American dimension lumber under the Chinese load conditions.

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