Volume 1 Issue 10 - October 26, 2007
Residual Stress-Strain Relationship for Concrete after Exposure to High Temperature
Min-Fu Hsu

Department of Architecture, College of Planning and Design

Wen-Shao Chang, Min-Fu Hsu, Kohei Komatsu, Wei-Jye Chen, FEB 2007, On mechanical behavior of traditional timber shear wall in Taiwan II: simplified calculation and experimental verification, J. WOOD SCIENCE 53 (1): 24-30
Wen-Shao Chang, Kohei Komatsu, Min-Fu Hsu, Wei-Jye Chen, FEB 2007, On mechanical behavior of traditional timber shear wall in Taiwan I: background and theory derivation , J. WOOD SCIENCE 53 (1): 17-23

In the past, only few efforts have been invested to investigation of seismic behaviour of traditional timber structures in Taiwan. In 1999, the Chi-Chi earthquake struck central Taiwan and destroyed many traditional timber structures, since then a series of multi-year project has been initiated focusing on this issue. This project is part of the multi-year project aforementioned.

The wooden shear walls are usually used as partitions in the traditional timber structures, however it plays an important role when the entire structure is subjected to external excitation. All over the world, various traditional, climatic, and territorial situations result in different wall systems in tectonic even the same materials are used, this requires further study into these various wall systems. This study investigates the factors that affect the stiffness, strength and related mechanical properties of these wooden shear wall systems developed in traditional timber structures in Taiwan.

An extensive field survey was conducted to collect important information required in the experimental program. The results showed that the wooden shear wall comprises 9%, 54% and 79% in the high, medium and low part of the timber frames observed. The Chinese Fir (Cunninghamia lanceolata) is usually used as constructional material, while few use Taiwanese red cypress(Chamaecyparis formosensis Mats.).

A total of 15 specimens was tested and compared with the theoretical models established in this study, which is used to investigate the factors that affect the mechanical properties of wooden shear wall in this study. Figure 1 shows the validity of the theoretical model proposed. The model indicates that the horizontal force resistances of wooden shear wall are contributed from three mechanisms, including the compression of in beams perpendicular to the grain, the frictions between the panel units and beams, and bamboo nail, among which the friction between the panel units and beams are dominant. Further investigations show that the horizontal stiffness and strength are in proportion to the dimensions of wall width. Linear relationship can also be found between the stiffness and wall height. The results of parametric analyses show that the stiffness and strength will increase with the increase of modulus of elasticity of top and bottom beams.

This study proposed a theoretical model and compared with the experimental results, which can help to understand the mechanical properties of wooden shear walls in traditional timber structures. By incorporating the results obtained in previous works, acceptable results between comparison of analytical and experimental approach can be obtained (Figure 2).
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