Results 51 to 60 of about 632 (134)
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
doaj
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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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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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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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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Development and prospect of oil & gas pipeline engineering from the perspective of the philosophy of engineering [PDF]
Objective The emergence of the science-technology-engineering ternary framework symbolized the rise of the philosophy of engineering as a branch of the discipline of philosophy.
Pengchao CHEN, Zhongyuan GUAN
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Distribution of refrigerated products to Family Mart stores in Shanghai [PDF]
, 2018 Provisioning and replenishment of goods is essential for the success of Family Mart stores. Family Mart is a convenience store franchise chain launched in Japan that has expanded to more 7 countries, China among them.
Domènech Roca, Marta
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Jianzhu Gangjiegou Jinzhan, 2021 针对中德两国规范关于带部分螺纹的螺杆伸入螺孔中的普通螺栓连接构件,在受静态剪力的作用下,其承载力的计算规定的不同情况,设计了18个试件在不同的螺纹伸入螺孔中深度的单剪单螺栓连接试验,分析螺纹伸入螺孔中的深度对连接承载性能的影响。并运用有限元建模方法,改变螺纹伸入螺孔中的深度、螺栓直径和连接板的厚度进行参数分析。结果表明,有限元分析得到的极限承载力、荷载-位移曲线和破坏形式与试验结果吻合良好,为参数分析提供依据;当螺纹伸入螺孔中的深度为0.88t(t为连接板的厚度)时 ...
徐忠根, 陈千, 邓长根, 陈荣毅
doaj
The control of fragmenting swelling deformation disasters in deep mine roadways and the efficient TBM tunneling technology under such conditions [PDF]
As shallow coal resources are gradually exhausted, the exploitation of deep coal resources goes deeper, where all mines in eastern China and some mines in central-western China have entered the deep mining stage.
Bin LIU +16 more
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