Dynamic parallel-to-grain compressive properties of three softwoods under seismic strain rates: tests and constitutive modeling

Author:

Xie Qifang12ORCID,Zhang Lipeng12,Zhang Baozhuang12,Yang Gaojie3,Yao Jitao12

Affiliation:

1. School of Civil Engineering , Xi’an University of Architecture and Technology , Xi’an 710055, Shaanxi , China

2. Key Laboratory of Structure Engineering and Earthquake Resistance, Ministry of Education (XAUAT) , Xi’an 710055, Shaanxi , China

3. CISDI Engineering Co., Ltd. , No. 1 Saidi Road, Liangjiang New Area, 401122 Chongqing , China

Abstract

Abstract Softwood is commonly used in timber structures, whose dynamic compressive properties along the grain direction under seismic rate actions are of major concern. In the present study, 108 samples were examined from three species of softwoods (spruce, Dahurian larch and pine) and subjected to four levels of strain rates (10−4 s−1, 10−3 s−1, 10−2 s−1 and 0.1 s−1) under parallel-to-grain monotonic and repeated compression. The seismic strain rate effects on softwood were investigated by observing the failure mechanisms, engineering stress-strain curves, initial crushing strength, elastic modulus and peak strain. Results demonstrated the high sensitivity of softwood to seismic strain rates. Finally, a rate-dependent constitutive model was developed to predict the stress-strain relationship (both monotonic and repeated loading cases) of softwood under different seismic strain rates.

Publisher

Walter de Gruyter GmbH

Subject

Biomaterials

Reference26 articles.

1. Bindiganavile, V.S. (2003) Dynamic fracture toughness of fiber reinforced concrete. PhD thesis, University of British Columbia.

2. CRIWI GB 1928 (2009) GB 1928-2009 General requirements for physical and mechanical tests of wood. China Standards Press, Beijing, China.

3. CRIWI GB 1931 (2009) GB 1931-2009 China Standards Publication. Method for determination of moisture content of wood. China Standards Press, Beijing, China.

4. CRIWI GB 1933 (2009) GB 1933-2009 China Standards Publication. Method for determination of moisture density of wood. China Standards Press, Beijing, China.

5. CRIWI GB 1935 (2009) GB 1935-2009 China Standards Publication. Method of testing in compressive strength parallel to grain of wood. China Standards Press, Beijing, China.

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