Ultimate Strength of High Strength Concrete Columns Reinforced with Concrete Filled Steel Tube Under Axial Compression and their Reliability Analysis [PDF]
, 2005 为了探求一个合理的设计公式来计算带圆钢管的劲性高强混凝土柱在轴压下的极限强度,完成了包含13个短柱试件在内的轴心受压试验以研究该类柱在轴压下的破坏模式和极限强度.试验结果表明,在荷载作用下,直到荷载接近极限值时,柱中钢管、纵向钢筋以及混凝土三者之间的纵向应变基本上是协调的,计算结果与试验结果吻合良好,因此可以采用叠加原理来计算带圆钢管的劲性高强混凝土柱在轴压下的极限承载力.此外,分析了该极限承载力计算公式的可靠度水平.分析结果表明,该承载力计算满足GB50068-2001对构件可靠指标的要求.This ...
易伟建 +4 more
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Thermal and mechanical properties of fracture-filled granite with different structural forms under high temperature and high pressure [PDF]
The reservoir of deep hot dry rock (HDR) geothermal energy is not intact rock mass, which includes a large number of fractures induced by geological tectonic movement. The tectonic fractures are subsequently filled by hydrothermal fluid.
Weitao YIN, Zijun FENG
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Jianzhu Gangjiegou Jinzhan火灾下轴心受压约束钢构件的力学响应复杂，所产生的温度内力导致其耐火极限的确定与计算难度大。为简化结构构件在高温承载极限状态时约束钢构件的防火设计，采用有限元数值模拟方法开展了大量参数分析，以确定火灾高温下轴心受压约束钢构件的承载与失效规律。基于经试验验证的可靠有限元模型，研究了不同长细比、轴向约束刚度比和初始荷载比等参数对轴心受压约束钢构件火灾响应的影响。结果表明，上述参数均将显著影响约束钢构件的火灾响应，且当长细比较大、轴向约束刚度比较小、初始荷载比较大时 ...
朱劭骏 +6 more
doaj
Wave velocity evolution and fracture distribution of soft coal under uniaxial compression [PDF]
In order to study the ultrasonic propagation law and damage characteristics of the soft coal body, coal briquette is selected to replace raw coal, three wave propagation paths were set, and MTS rock mechanics experiment machine and PCI-II acoustic ...
Ancheng WANG +4 more
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Investigation of physicochemical and triaxial compressive properties of conglomerate in acidic leachate [PDF]
The seepage effect of leaching solution in the process of in-situ leaching mining may lead to the deterioration of the mechanical properties of the aquifuge, and affect the safety of coal uranium co-mining.
Chen LI +4 more
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Gaoya dianqi, 2008 阐述了电容分压器的电路原理,根据同轴型电容分压器的容值计算公式计算了电容分压器的理论分压比,研制了一种用于测量上升沿小于10 ns脉冲高压的同轴型电容分压器,并利用方波源和电阻分压器对其进行了标定。实验测试表明,该电容分压器满足测量要求,能很好地测量快前沿的陡脉冲电压信号。
刘轩东 +3 more
doaj
Mechanical properties and energy evolution mechanism of coal prone to ejection [PDF]
In this paper, true triaxial loading and unloading tests under different principal stress conditions were conducted to study the mechanical properties, failure characteristics, and energy evolution laws of coal bodies that are prone to ejection under ...
Wentao XU, Yunhai CHENG
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Rock strength and permeability under compression-shear coupling corresponding to different loading angles [PDF]
The Ordovician limestone aquifer is widely developed in the basement of the Carboniferous Permian coal bearing strata in North China. Coal mining is threatened by both water inrush disasters and water resource loss from the floor confined aquifer.
Dongsheng ZHANG +3 more
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Jianzhu Gangjiegou Jinzhan, 2017 根据已有残余应力分布模型对冷弯厚壁型钢典型截面进行了理论分析,得到残余应力对冷弯厚壁型钢轴压构件承载力的影响规律。在理论分析的基础上对不同厚度、不同宽厚比的Q235、Q345冷弯厚壁型钢进行有限元分析,得到不同长细比的各构件在考虑和不考虑残余应力两种情况下的轴压承载力,并研究残余应力对冷弯厚壁型钢长柱轴压承载力的影响。结果表明:残余应力对冷弯厚壁型钢轴压承载力的影响在长细比为90时达到最大,且对Q235钢的影响比Q345钢的影响略小 ...
李元齐, 李功文, 沈祖炎
doaj
Study on water inrush failure mode of karst tunnel based on three-dimensional discrete-continuous coupling [PDF]
During the construction of karst tunnel, it is difficult to avoid approaching the cavern, even high pressure water cavern. Water inrush damage very easily causes safety accidents and would have irreversible impact on the tunnel.
Baohua DENG +5 more
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