Results 31 to 40 of about 2,403 (196)
Jianzhu Gangjiegou Jinzhan综合考虑桥梁系统灾变全过程，提出了一种适用于高地震烈度寒区的钢-混凝土组合梁桥抗震韧性评价方法。基于现有统计数据，综合考虑桩基沉降损伤、疲劳损伤以及冻融损伤，建立了高地震烈度寒区钢-混凝土组合梁桥震前功能损失函数；将地震易损性分析与桥梁抗震韧性评价相结合，建立了桥梁系统震后恢复函数；提出了震前临界维修加固年限和临时保通状态。结果表明：在高地震烈度冻土区的钢-混凝土组合梁桥系统的临界维修加固年限随地震动峰值加速度的增大而减小，当地震动峰值加速度分别为0.10g、0.15g、0.20g、0.30g时 ...
熊治华, 刘旭尧, 李佳奇, 刘陈
doaj +2 more sources
, 2017 碳纤维增强塑料筋(CFRP筋)因其耐腐蚀等优点被应用于组合梁。现在研究其耐火性能的计算一般认为混凝土没有开裂，与实际情况存在差别，并带来安全问题。本文基于ISO834标准升温曲线模拟CFRP组合梁在室内火灾下的情况，考虑CFRP筋组合梁在弯曲荷载和温度荷载共同作用下的耐火极限和受力分析。通过建立火灾下考虑裂缝影响的CFRP筋组合梁热力耦合模型，得到裂缝对不同保护层厚度、配筋率和作用荷载比的CFRP筋混凝土梁耐火极限的影响规律，总结出CFRP筋组合梁的防火相关设计建议。 Carbon fiber ...
朱庸, 查晓雄
semanticscholar +1 more source
, 2016 为了研究全焊接组合梁–柱节点的承载力，通过两个中跨全焊接组合梁–柱节点在单调静力作用下和低周往复荷载作用下的破坏试验，获得了节点承载性能、滞回性能和破坏模式。由试验结果可看出：节点主要的破坏模式为钢梁下翼缘及腹板局部屈曲和混凝土压溃。本文将介绍主要试验结果，为后续试验研究提供依据。 An experimental research on load bearing capacity of joints for composite beam to column was carried out.
李颖超, 蒋首超
semanticscholar +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 预应力波纹腹板开孔组合梁力学性能不同于普通平腹板开孔组合梁。为研究腹板开孔对预应力波纹钢-混凝土组合梁抗火性能的影响，采用有限元软件ABAQUS对该类组合梁在高温作用下的力学性能进行非线性有限元分析，重点考察了预应力波纹腹板开孔组合梁的内力、跨中挠度以及破坏模式，并对其耐火性能进行了参数研究。结果表明：孔洞所在截面波纹腹板剪应力呈非均匀分布，临界状态时，该截面腹板基本丧失抗剪能力。预应力波纹腹板组合梁纯弯区开孔时，其破坏模式与无孔组合梁一致，均为弯曲破坏，孔洞基本不影响其跨中挠度与耐火性能 ...
周焕廷, 陈祥, 伍先兴
doaj
Analytical Study on the Effective Flange Width for T-shaped Shear Walls [PDF]
, 2020 This study was organized to derive simplified expressions to estimate the effective flange width for T-shaped shear walls at different loading stages. For that purpose, the variation in the effective flange width was explored by introducing dimensionless
Li, Weibin, Lu, Nan
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Classification and instability mechanism of anchored “beam-arch” composite structure in rock burst roadways with top-coal [PDF]
The rock burst frequently occurs in the roadways with top coal, and the roof disasters are particularly severe under dynamic stress in China. In order to explore the classification and instability mechanisms of anchoring structures in the roadways with ...
Anye CAO +7 more
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Multi-bed separation grouting in “three soft” thick coal seams mining and its application [PDF]
Accurate identification of the grouting position in overburden isolated grouting and the reasonable determination of the protective layer thickness are of significant importance for preventing surface subsidence and protecting surface buildings and ...
Bibi WANG +5 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2020 为了在中小跨径桥梁中推广使用钢-混凝土组合结构桥梁,提高桥梁的工业化建造水平和组合梁桥的装配化程度,提出了一种整体预制钢-混凝土组合梁桥结构。结合常用的中小跨径的需求,考虑公路运输条件和吊装能力,构建了整体预制钢-混组合梁结构基本单元,并提出了单元之间的连接方式,进一步形成整体桥梁。计算分析表明:所提出的整体预制钢-混组合梁,在受力性能方面均优于传统分离预制钢-混组合梁,在全寿命周期的经济性能方面优于现有的预制混凝土箱梁、预制混凝土T形梁,在施工性能方面相比于现有的预制混凝土箱梁 ...
苏庆田 +4 more
doaj
石灰石粉与不同矿物掺合料复掺对高强自密实混凝土性能的影响 [PDF]
, 2018 基于混凝土的自密实性能和强度试验结果,研究了石灰石粉分别与粉煤灰、矿粉和硅灰3种不同矿物掺合料复掺组合对高强自密实混凝土性能的影响。结果表明:在合适的掺量范围和复配合比例条件下,将低活性的石灰石粉与高活性的硅灰复掺有很好的互补效应,对混凝土的自密实性能和强度产生了积极影响;石灰石粉与矿粉复掺不仅可以改善混凝土的自密实性能,同时也能满足高强要求。石灰石粉与硅灰、石灰石粉与矿粉复掺组合是制备高强自密实混凝土的有效技术手段。石灰石粉与粉煤灰复掺虽然显著提高了混凝土的自密实性能,但是不能满足高强要求,只能制备中、
李巧, 罗德富, 胡红梅, 高菲菲
core
Determination of grouting layer and stability analysis of slurry-resisting overburden in separation grouting [PDF]
The technology of bed separation grouting subsidence reduction is one of the important means of protecting surface buildings and infrastructures in mining areas, the selection of the grouting layer and the integrity of the slurry-resisting overburden ...
Dongtao WU +4 more
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