Results 51 to 60 of about 702 (163)
Well wall water leakage control technology of vertical well drilling method in coal mines based on grouting of ground directional drilling [PDF]
The coal mine drilling shaft wall is a single-layer structure, and water leakage in the deep alluvium will seriously threaten mine safety. If there are construction defects in the stubble part of the well wall at the construction stage, it will lead to ...
Chuanxin RONG +4 more
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Simulation and analysis method for dynamic fatigue reliability of shovel stick for mining electric shovel [PDF]
In order to reduce the stick fracture caused by random load during the operation of the electric shovel in open-pit mines, a simulation and analysis method of the dynamic reliability of the stick of the electric shovel in the mining was proposed.
Chong CHEN +3 more
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Jianzhu Gangjiegou Jinzhan抗滑移系数是影响摩擦型高强螺栓连接承载力的主要因素之一。为研究火灾后摩擦型高强螺栓连接的剩余承载力，本文设计了由10.9级M20摩擦型高强螺栓和Q355B钢板组成试件的受剪试验，研究了钢板不同表面处理方式、不同加热温度自然冷却后摩擦型高强螺栓的抗滑移系数及其折减系数的变化规律。研究结果表明：钢板表面处理方式会影响摩擦型高强螺栓连接的抗滑移系数，且这种影响会随着加热温度的升高有所增大，加热温度相同时采用喷砂表面处理方式螺栓连接的抗滑移系数比采用金属去毛刺打磨表面处理方式螺栓连接的抗滑移系数更大 ...
张菊 +4 more
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Jianzhu Gangjiegou Jinzhan, 2014 小尺寸闭口截面柱的螺栓拼接技术国内外研究较少,提出了一种新型的以内套筒作为连接件,以高强度螺栓和对穿螺栓作为紧固件的拼接节点形式。通过轴压破坏试验分析节点的受力特性、承载力和破坏方式,提出节点强度设计建议。结果表明,节点连接安全可靠,但由于存在螺栓滑移,适用于承受静力荷载和间接承受动力荷载的连接中。
刘康 +4 more
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Jianzhu Gangjiegou Jinzhan, 2022 为分析Q690和Q275双排螺栓连接角钢的块剪破坏承载性能，采用ABAQUS软件建立非线性有限元计算模型，结合已有角钢螺栓连接受拉块剪破坏的试验数据，验证了模型的准确性。在此基础上，建立参数化模型分析了钢材强度等级、螺栓端距、螺栓数量和连接形式对角钢承载性能的影响，并基于分析结果对中、美钢结构设计规范和文献提出的块剪破坏计算公式进行了评估。结果表明：Q690高强度双排螺栓连接角钢的延性低于Q275强度角钢的延性，但仍然呈现出明显的延性破坏特性。螺栓端距和数量的增加可以提高角钢块剪破坏时的极限承载力 ...
张茗渊, 柯珂
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Jianzhu Gangjiegou Jinzhan为提升高强度螺栓摩擦型连接的连接效率，本文提出了将硬金属波纹板与软金属进行组合的新型高效螺栓连接形式，通过接触面间的犁沟效应和黏着效应，可以显著提高螺栓连接的抗滑移系数。采用理论和试验相结合的研究方法，阐明了该种高效螺栓连接形式的作用机理及影响因素，设计并进行了27个抗滑移系数试验和4个表面硬度测试试验，探究了不同表面处理方式、不同孔型对螺栓连接抗滑移系数的影响，并与理论分析值进行对比。试验结果表明：硬金属和软金属的硬度比是影响高效螺栓连接抗滑移系数的重要因素，连接采用非标准孔将会降低抗滑移系数 ...
陈振明, 马琳, 高飞, 王综轶
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Jianzhu Gangjiegou Jinzhan, 2013 通过建立系列有限元分析模型研究了外伸端板高强度螺栓抗拉连接的力学性能,分析中考虑了不同端板厚度和螺栓直径变化对连接节点受力性能的影响。研究结果表明,高强度螺栓总拉力应由外加荷载引起的螺栓拉力和端板弯曲变形产生的撬力组成。通过分析拟合得到由外加荷载产生的螺栓拉力和螺栓撬力的分布模型和计算公式,并分别给出摩擦型和承压型两种类型的高强度螺栓考虑撬力影响抗拉连接承载力计算公式。
刘秀丽, 王燕
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Analysis of the influence of different damage forms on the residual ultimate strength of ship structure [PDF]
ObjectivesShips are essential for waterborne transportation, and the safety of their structures is of utmost importance. However, during operation, ships may encounter various accidents such as collisions and groundings, which may damage the hull ...
Weiguo WU +2 more
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Experimental study on seismic performance of composite reinforced structure with shock absorption and energy dissipation of potentially collapsedrock mass [PDF]
At present, there are two types of structures for strengthening dangerous rock mass in earthquake area construction: anchorage and retaining. The connection between the two types of reinforced structures and the dangerous rock mass is rigid with very ...
Aishe ZHANG +5 more
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Jianzhu Gangjiegou Jinzhan, 2020 针对大量使用的钢结构闭口截面构件难以全螺栓连接、风电等大直径高耸钢管结构在风致动载作用下拼接接头抗疲劳能力不足、承受动载的大型钢结构基础预应力抗拔锚栓缺乏设计与施工成套技术等3大问题,通过概念设计、理论分析、试验研究、数值模拟、产品研制、装备开发等手段,研制了单向(边)高强螺栓紧固件、反向平衡法兰连接技术和螺栓预拉力直接张拉法设备、可更换预应力锚栓和大型锚栓施工定位装置,开发了锚栓预应力直接张拉安装技术,提出了梁柱全螺栓连接半刚性钢框架设计方法 ...
李国强 +7 more
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