| 1 | Research on Sleeve Grouting Density Detection Based on the Impact Echo Method显示文摘Grouting defects are an inherent challenge in construction practices,exerting a considerable impact on the operational structural integrity of connections.This investigation employed the impact-echo technique for the detection of grouting anomalies within connections,enhancing its precision through the integration of wavelet packet energy principles for damage identification purposes.A series of grouting completeness assessments were meticulously conducted,taking into account variables such as the divergent material properties of the sleeves and the configuration of adjacent reinforcement.The findings revealed that:(i)the energy distribution for the highstrength concrete cohort predominantly occupied the frequency bands 42,44,45,and 47,whereas for other groups,it was concentrated within the 37 to 40 frequency band;(ii)the delineation of empty sleeves was effectively discernible by examining the wavelet packet energy ratios across the spectrum of frequencies,albeit distinguishing between sleeves with 50%and full grouting density proved challenging;and(iii)the wavelet packet energy analysis yielded variable detection outcomes contingent on the material attributes of the sleeves,demonstrating heightened sensitivity when applied to ultrahigh-performance concrete matrices and GFRP-reinforced steel bars. | Pu Zhang Yingjun Li Xinyu Zhu Shizhan Xu Pinwu Guan Wei Liu Yanwei Guo Haibo Wang | 2024 | Structural Durability & Health Monitoring2024，18，2： | 0 |
| 2 | Study of the packaging materials and the structural renewal of'Snow Bud'in Shutao Company显示文摘The improved'Snow Bud'packaging mainly includes the medium packing and the external packaging,with the cuboid as the main structure,and the paper as the main material.The inner packaging uses the tin foil paper bag.Because of the thin thickness of the carton used and the problems in colors,patterns,character design,structures and other aspects,the purpose of the improvement is to use the new structures to enhance the practical functions of the packaging and to explore the application of the new materials in the tea packaging. | XU Yiming GU Siyang LI Pinwu | 2019 | International English Education Research2019，，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员