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Song Xiaoguang,Zhang Yingying,Zhang Qilin 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.4
This paper presents the research on failure modes and loading bearing capacity of two types of purlin-sheet roofs under uniform loadings. The full-size experiments are carried out on the purlin-sheet roofs and the allowable design stress and design proposals are proposed. Besides, the finite element analysis is conducted to compare with the experiments. Results show that the failure modes and loading bearing capacity of two types of purlin-sheet roofs are different. The first is that the adjustments are pulled out from the base, while the mechanical occlusions between the adjacent sheet and adjustments are well. The latter is that the mechanical occlusions between the adjustment and sheets are tensioned fracture, while the adjustment are tensioned straight and pulled out from the sheets. The numerical calculations and experiment data are in good agreement, and the deviations are mainly because of initial defects of specimens, construction errors of specimens and loading protocols. The numerical calculation method is reliable and can be used to analyze the sheet-purlin roof connected by standing seam clips.
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Yingying Zhang,Xiaoguang Song,Qilin Zhang 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.2
This paper presents the parametric numerical analysis on the ultimate bearing capacity of the purlin-sheet roofs connected by standing seam clips. The effects of several factors on failure modes and ultimate bearing capacity of the purlins are studied, including setup of anti-sag bar, purlin type, sheet thickness and connection type et al. A simplified design formula is proposed for predicting the ultimate bearing capacity of purlins. Results show that setting the anti-sag bars can improve the ultimate bearing capacity and change the failure modes of C purlins significantly. The failure modes and ultimate bearing capacity of C purlins are significantly different from those of Z purlins, in the purlin-sheet roof connected by standing seam clips. Setting the anti-sag bars near the lower flange is more favorable for increasing the ultimate bearing capacity of purlins. The ultimate bearing capacity of C purlins increases slightly with sheet thickness increasing from 0.6 mm to 0.8 mm. The ultimate bearing capacity of the purlin-sheet roofs connected by standing seam clips is always higher than those by self-drilling screws. The predictions of the proposed design formulas are relatively in good agreement with those of EN 1993-1-3: 2006, compared with GB 50018-2002.
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Dynamic characteristics and wind-induced vibration coefficients of purlin-sheet roofs
Yingying Zhang,Xiaoguang Song,Qilin Zhang 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.5
This paper presents the dynamic characteristics analysis of the purlin-sheet roofs by the random vibration theories. Results show that the natural vibration frequency of the purlin-sheet roof is low, while the frequencies and mode distributions are very intensive. The random vibration theory should be used for the dynamic characteristics of the roof structures due to complex vibration response. Among the first 20th vibration modes, the first vibration mode is mainly the deformations of purlins, while the rest modes are the overall deformations of the roof. In the following 30th modes, it mainly performs unilateral local deformations of the roof. The frequency distribution of the first 20th modes varies significantly while those of the following 30th modes are relatively sensitive. For different parts, the contributions of vibration modes on the vibration response are different. For the part far from the roof ridge, only considering the first 5th modes can reflect the wind-induced vibration response. For the part near the ridge, at least the first 12 modes should be considered, due to complex vibration response. The wind vibration coefficients of the upwind side are slightly higher than that of the leeward side. Finally, the corresponding wind vibration coefficient for the purlin-sheet roof is proposed.
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Yingying Zhang,Jigang Xue,Xiaoguang Song,Qilin Zhang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
This paper presents the numerical parametric analysis on the loading capacity of Channel purlins with screw-fastened sheeting, in which the eff ects of anti-sag bar and corrugated steel sheet on the ultimate capacity are studied. Results show that the setup of anti-sag bars can reduce the deformations and improve the ultimate capacity of C purlins. The traditional method of setting the anti-sag bars in the middle of the web is favorable. The changing of sheeting type, sheeting thickness and rib spacing has signifi cant eff ects on the ultimate capacity of C purlins without anti-sag bars, compared with those with anti-sag bars. The proposed design formulas are relatively consistent with the calculations of EN 1993-1-3:2006, which is diff erent from those of GB 50018-2002.
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A Medium Access Control Mechanism for Distributed In-band Full-Duplex Wireless Networks
( Haiwei Zuo ),( Yanjing Sun ),( Song Li ),( Qiang Ni ),( Xiaolin Wang ),( Xiaoguang Zhang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.11
In-band full-duplex (IBFD) wireless communication supports symmetric dual transmission between two nodes and asymmetric dual transmission among three nodes, which allows improved throughput for distributed IBFD wireless networks. However, inter-node interference (INI) can affect desired packet reception in the downlink of three-node topology. The current Half-duplex (HD) medium access control (MAC) mechanism RTS/CTS is unable to establish an asymmetric dual link and consequently to suppress INI. In this paper, we propose a medium access control mechanism for use in distributed IBFD wireless networks, FD-DMAC (Full-Duplex Distributed MAC). In this approach, communication nodes only require single channel access to establish symmetric or asymmetric dual link, and we fully consider the two transmission modes of asymmetric dual link. Through FD-DMAC medium access, the neighbors of communication nodes can clearly know network transmission status, which will provide other opportunities of asymmetric IBFD dual communication and solve hidden node problem. Additionally, we leverage FD-DMAC to transmit received power information. This approach can assist communication nodes to adjust transmit powers and suppress INI. Finally, we give a theoretical analysis of network performance using a discrete-time Markov model. The numerical results show that FD-DMAC achieves a significant improvement over RTS/CTS in terms of throughput and delay.
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