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31.
Numerically based proposals for the stiffness and strength of masonry infills with openings in reinforced concrete frames
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Aimed at investigating the effect of openings on the in‐plane behaviour of masonry infills in reinforced concrete frames, a parametric study is presented based on model calibration via experimental tests. Two types of openings are investigated: central window openings and different combinations of door and window openings based on the typologies of southern European countries. First, a finite element model of the structure is made using the DIANA software program. Then, after calibration with experimental results, a parametric analysis is carried out to investigate the effect of the presence and location of the different types of openings on the in‐plane behaviour of the infilled frame. Finally, different equations for predicting the initial stiffness and lateral strength of infilled frames with any types of openings were obtained. An α factor related to the geometry of the piers between openings is proposed to take into account the location of the openings in the developed equations. Subsequently, the masonry infill panel is replaced by a diagonal strut. An empirical equation is also proposed for the width of an equivalent strut to replace a masonry infill panel with openings in such a way that they possess the same initial stiffness. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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新型平口式集沙仪对不同粒级颗粒的收集效率 总被引:1,自引:2,他引:1
目前,国内缺少对集沙仪集沙效率问题的深入研究。采用风洞实验手段,就新型平口式集沙仪对不同粒级颗粒的收集效率进行了研究。结果表明:该集沙仪对1~0.85、0.85~0.5、0.5~0.25、0.5~0.1、0.25~0.1、0.1~0.05、<0.1、<0.05mm粒级颗粒的平均收集效率分别为54.9%、59.6%、69.7%、52.6%、24.6%、21.0%、17.7%、13.2%,表现出对>0.25mm粒级颗粒收集效率较高、对<0.25mm粒级颗粒收集效率较低的特点。该集沙仪的集沙效率不是随着颗粒粒级增大而一直增大的,而是在0.5mm左右存在一个峰值。集沙仪的集沙效率没有表现出随风速变化的明显规律性,与各粒级颗粒风蚀强度之间也没有必然的联系。造成集沙仪对不同粒级颗粒收集效率差距较大的原因可能是不同粒级颗粒运动状态的差异和沙网孔径的大小。 相似文献
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PRESENTSITUATION,FEATUREANDDEVELOPMENTAL IDEASOFBORDEROPENINGINXINJIANGXieXiangfang(谢香方);LiChunhua(李春华)(XinjiangInstituteofGe... 相似文献
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Xiang Yu Chao Zhan Mengquan Wu Xueli Niu Xueyu Zhang 《Marine Georesources & Geotechnology》2020,38(8):887-895
AbstractTidal waterways perform as the paths through which seawater invades. Their spatial-temporal variation with the shift in Yellow River’s route requires the accurate measurement of their status. Visual interpretation for delineating tidal waterways is inefficient due to a substantial amount of work. Buffer analysis provides an alternative to visual interpretation. However, it is difficult to use the buffer distance threshold to identify tidal waterways from other freshwater bodies. In this study, we present a straightforward method for mapping tidal waterways. First, we adopted the normalized difference water body index (NDWI) to extract water bodies. Waterlines were subsequently delineated based on a morphological opening filter with a kernel of 9?×?9. Finally, tidal waterways were mapped based on the proposed topological relation in ArcGIS. We showed the utility of this approach by mapping tidal waterways in the Yellow River Delta, China. The proposed method enables tidal waterways be mapped precisely and was replicable and universal in other similar studies. 相似文献
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本文用计算确定双拖网曳纲的空间形状与张力,估算在一定拖速下两船间距、水深与网具水平扩张的关系。根据模型试验测出的水平与垂直扩张值,换算出双拖网网口高度并与实测结果比较。可针对各级渔轮和生产条件,广泛计算并列出图表,以便在生产中用于双拖网调整。 相似文献
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Jayme M. Santangelo Adriana de M. Rocha Reinaldo L. Bozelli Luciana S. Carneiro Francisco de A. Esteves 《Estuarine, Coastal and Shelf Science》2007,71(3-4):657-668
The effects of a disturbance by sandbar opening on the zooplankton community were evaluated through a long-term study in an eutrophic and oligohaline system, Imboassica Lagoon, Rio de Janeiro, Brazil. Zooplankton samples and limnological data were collected monthly from March 2000 to February 2003. Before the sandbar was opened in February 2001, the lagoon showed eutrophic conditions, with high mean nutrient concentrations and low salinity (total nitrogen – TN = 190.28 μM, chlorophyll a content – Chl. a = 104.60 μg/L and salinity = 0.87′). During this period, the zooplankton species present, such as the rotifers Brachionus calyciflorus and Brachionus havanaensis, were typical of freshwater to oligohaline and eutrophic environments. After the sandbar opening, the lagoon changed to a lower trophic status and increased salinity (TN = 55.11 μM, Chl. a = 27.56 μg/L and salinity = 19.64′). As a result, the zooplankton community came to consist largely of the rotifer Brachionus plicatilis, marine copepods and meroplanktonic larvae, mainly Gastropoda. Salinity was the main force structuring the zooplankton community after the sandbar opening. Two years after this episode, the prior zooplankton community had not reestablished itself, indicating a low resilience to this disturbance. The conditions developed prior to a sandbar opening can be crucial to the community responses in the face of this disturbance and for the capacity of the original zooplankton community to re-establish itself. 相似文献