Screening for internal defects of timber members based on impact evaluation method
| Autor: | Cheng Guan, Houjiang Zhang, Dian Zhang, Yongzhu Yu, Guo Kailong, Fenglu Liu, Zhenbo Xin |
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| Rok vydání: | 2020 |
| Předmět: |
Validation test
Impact evaluation education 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction Impact test Boundary values Hardness 0201 civil engineering Frequency domain 021105 building & construction Statistics Screening method General Materials Science Civil and Structural Engineering Mathematics |
| Zdroj: | Construction and Building Materials. 263:120145 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2020.120145 |
| Popis: | This paper proposes a screening method and quantitative criteria for screening the internal defects of ancient timber members. Based on the impact evaluation (IE) method, two parameters, i.e. time of impact (TI) and proportion of integral area (PIA), were used to assess the internal defects. Impact tests were also conducted to study the effects of different influencing factors on the parameters (TI and PIA). The results demonstrated the satisfactory screening ability of PIA when the optimal proportion for the boundary value (fb) in the frequency domain was set as 50%. TI had a strong correlation with both the length of internal defects (ld) and the surface hardness (R2 = 0.74 and 0.93); however, PIA only had a significant correlation with ld (R2 = 0.84). The validation test results revealed that the proposed method and quantitative criteria could be used to detect the internal defects of ancient timber when the distance between internal defects and the surface (ha) was less than 35 mm. |
| Databáze: | OpenAIRE |
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