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Jianzhu Gangjiegou Jinzhan, 2023 为提高风电塔架的抗震性能，提出了考虑耗能时序的混合式风电塔架的概念，重点研究了结构抗震设计与评估的关键指标——强度折减系数。利用等效单自由度体系表征具有三线性滞回特征的新型塔架，并基于不同周期和滞回参数组成的变量矩阵，以320条近场地震动作为激励对等效单自由度体系进行了大量非线性动力分析，获取了3 600万个强度折减系数。强度折减系数均值对结构周期及滞回参数敏感，故基于对比研究选取的对数正态分布概率模型，通过多轮非线性回归分析建立了一系列预测方程，从而实现强度折减系数概率谱模型的建立 ...
李红, 柯珂
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Jianzhu Gangjiegou Jinzhan进行了14根电力火灾后圆端形不锈钢管混凝土短柱的轴压试验，分析截面高宽比、受火时间和含钢率对其火灾后剩余承载力的影响。试验表明：该类短柱的破坏模态均为局部屈曲、焊缝开裂和混凝土被压碎；试件的剩余承载力随着受火时间或高宽比的增加而降低，受火120 min后该类试件的承载力降低了7.8%~13.9%。接着建立了有限元模型，该模型可很好地模拟实测结果。基于有限元模型开展了理论分析，结果表明初始荷载对该类组合柱的剩余承载力影响较小。参数分析表明当混凝土强度从30 MPa增加到90 MPa时 ...
高献 +4 more
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Jianzhu Gangjiegou Jinzhan为提高钢桁框体系的抗震可恢复性，提出了自复位钢桁框体系的概念，研究了其在脉冲地震下的强度折减系数。以等效单自由度体系表征具有三折线滞回特征的钢桁框体系，选取182条脉冲型地震动对等效单自由度体系进行非线性动力分析，得到包含6 022万个强度折减系数（R）的数据库，揭示了不同滞回参数和脉冲型地震动对强度折减系数的影响规律。此外，借助BP神经网络拟合强度折减系数在地震下的对数正态分布模型参数，并建立了基于概率的钢桁框体系强度折减系数模型。结果表明提出的模型具有较高的准确性。
刘艳芝, 蓝雅云, 颜阳, 柯珂
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Jianzhu Gangjiegou Jinzhan进行了14根电力火灾后圆端形不锈钢管混凝土短柱的轴压试验，分析截面高宽比、受火时间和含钢率对其火灾后剩余承载力的影响。试验表明：该类短柱的破坏模态均为局部屈曲、焊缝开裂和混凝土压碎；试件的剩余承载力随着受火时间或高宽比的增大而降低，受火120 min后该类试件的承载力降低了7.8%~13.9%。接着建立了有限元模型，该模型可很好地模拟实测结果。基于有限元模型开展了理论分析，分析表明初始荷载对该类组合柱的剩余承载力影响较小。参数分析表明当混凝土强度从30 MPa增加到90 MPa时 ...
高献 +4 more
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Experimental study on mechanical properties of filling-bulk ce-menting combination body [PDF]
, 2023 In order to study the influence of caved rocks in the goaf on the backfilling body in the backfilling mining, uniaxial compression test are carried out on the backfilling body-cemented granular body combination with different granular heights, discrete ...
Bingchao ZHAO +7 more
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Effects of α and α′ Subunit of β-conglycinin on Microstructure and Functional Properties of Soy Protein Isolate Films(β-伴大豆球蛋白中α、α′亚基对大豆分离蛋白薄膜微观结构和功能特性的影响) [PDF]
Shipin kexue jishu xuebao, 2022 In order to study the effect of different subunit compositions of β-conglycinin on the microstructure and functional properties of soy protein isolate film, Dong Nong 47 (Wild control), α-lack, α′-lack and (α+α′)-lack soybeans were selected as raw ...
YANG Xiaoqing(杨晓晴) +6 more
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Inhibitory Mechanism of Ferulic Acid on Xanthine Oxidase(阿魏酸对黄嘌呤氧化酶的抑制机理) [PDF]
Shipin kexue jishu xuebao, 2023 In order to systematically explore the molecular mechanism of ferulic acid suppressing the activity of xanthine oxidase (XO), the effects of ferulic acid on the inhibitory reversibility, inhibition kinetics, binding properties, and structure were ...
ZHANG Nanhai(张南海) +7 more
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考虑孔周应力集中的摩擦型高强度螺栓抗滑移性能分析与设计方法研究
Jianzhu Gangjiegou Jinzhan, 2023 抗滑移性能是摩擦型高强度螺栓受剪连接的重要力学性能之一。为研究抗滑移性能的影响因素，设计并完成了单个高强度螺栓抗滑移性能试验和高强度螺栓群抗滑移性能试验，连接试件均为双面剪切且表面进行了抛丸处理。基于试验结果，建立了准确、可靠的有限元验证模型，据此对高强度螺栓受剪连接进行了参数分析，主要研究参数包括：螺栓预紧次序、连接板件厚度、垂直于内力方向的螺栓间距与边距以及顺内力方向的螺栓间距与边距。分析结果表明：连接板件最危险截面的塑性区分布对摩擦型高强度螺栓的抗滑移性能有着显著影响 ...
高兴, 王伟
doaj
Stability assessment of the road cut slopes in the Xigeda mudstone considering long-term creep deterioration and suggestion for countermeasures: A case study of cut slopes along the Xichang–Panzhihua Expressway [PDF]
The Xigeda clay-rock strata exhibit typical characteristics of long-term creep deterioration and saturation softening, which is typical slide-prone stratum.
Feng WANG +4 more
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Experimental study on mechanical properties of rock degraded by hydraulic fracturing [PDF]
The accurate determination of the degree of mechanical property degradation of rock layers after hydraulic fracturing is the basis for revealing the pressure relief mechanism of hydraulic fracturing and evaluating the fracturing effect.
Junfeng PAN +5 more
core +1 more source