Results 41 to 50 of about 3,002 (128)
Jianzhu Gangjiegou Jinzhan, 2016 采用铸造工艺直接加工十字形截面核心的屈曲约束支撑(BRB,Buckling-Restrained Brace),避免在核心部件上直接施焊,可以消除焊接残余应力的影响。通过低周往复加载试验,研究了该类试件的滞回性能、骨架曲线、累积塑性变形、拉压不对称性、等效刚度等。试验结果表明,该类型的屈曲约束支撑可以避免焊接残余应力对试件抗震性能的影响,支撑试验滞回曲线饱满,具有稳定的受力特性,累积塑性变形基本达到200,且拉压不对称系数小于1.3,满足美国AISC钢结构规范的要求。由于铸造用钢有材料上的缺陷 ...
郭立行, 吴京
doaj
Damage and failure mechanism of pre-static loaded rock under cyclic impact [PDF]
To study the damage and failure mechanism of rocks under the coupling effect of high ground stress static load and cyclic impact disturbance generated by mining and excavation, the multi-strain rate dynamic static superposition rock mechanics test system
Bing ZHANG +4 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 碟簧垫片具有良好的变形和弹性复位能力,通过预压碟簧垫片可实现结构或构件的震后复位。通过将碟簧垫片引入至方钢管混凝土柱-H形钢梁连接节点,实现了此类节点的自复位功能。采用通用有限元程序ANSYS建立了节点的精细化有限元模型,并对带有碟簧的方钢管混凝土柱-H形钢梁连接节点进行了参数分析,重点考虑了碟簧初始预应力、碟簧数量、碟簧组合方式对此类节点滞回性能、抗弯承载力、节点刚度、耗能能力及残余转角的影响,并和传统角钢节点进行了对比。分析结果表明:通过对碟簧的合理设计,可实现此类节点在震后恢复至初始状态 ...
王一心 +3 more
doaj
The Research of Wind-induced Control based on the energy balance principle [PDF]
, 2013 随着建筑功能的多样化，以及新材料、新结构与新体系的迅猛发展与应用，高层建筑的楼层数逐渐增多，高度也逐渐增高，结构也变得越来越柔，这给我们的结构设计带来了新的要求和挑战，结构的抗风设计也因此变的更加重要。传统的抗风设计方法已不能很好的满足设计的要求，即使满足了要求，也是不经济的。有效、可靠、安全、经济的方法是采用结构的风振控制技术，即通过在结构中设置减震装置来减小结构的动力响应。本文在以往研究的基础上，基于能量的平衡原理，分别对一维和三维建筑结构进行风振控制研究，主要完成了以下工作： 1 ...
傅建芳
core
Sensitive neighborhood range of red sandstone under rheological disturbance condition [PDF]
Under the action of disturbance load, the rheological rock mass in the “sensitive neighborhood” is prone to deformation and failure. In order to study the influence of confining pressure on the range of disturbance “sensitive neighborhood”, the red ...
Bo WANG +7 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2023 采用精细塑性铰法考虑残余应力和逐步塑性，并引入弓形效应来提高计算精度，同时基于截面组合法建立的工字形或H形截面的屈服面方程进行严格推导，提出一种单元恢复力迭代算法，减少了半理论半经验公式的使用。此外，所采用的梁柱单元还可以考虑梁构件剪切变形和几何初始缺陷的影响。相比之前的方法，该方法能在进行塑性铰分析的同时，在单元的轴力表达式中考虑二阶效应，更全面地考虑非线性因素影响。最后，通过两个经典算例的对比，证明了该方法具有高效率和高精度的特点。
朱贺, 汤轶群, 杜二峰
doaj
Study on creep characteristics of fractured rock masses in caved zones with different roof strengths [PDF]
Objective The caved zone in goaf areas is filled with fractured rock masses, and the strength of these fractured rock masses after collapse serves as a key factor causing differential long-term creep characteristics of the goaf.
CAI Guanjun +3 more
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Energy-driven mechanism of failure and instability of anchored surrounding rock in deep gob-side entry [PDF]
Affected by the dynamic load induced by the fracture of lateral roof in the deep gob-side entry, the anchored surrounding rock is prone to produce large deformation, even failure and instability.
Hongxi PEI +5 more
core +1 more source
Jianzhu Gangjiegou Jinzhan, 2018 自复位钢板剪力墙是将后张拉节点和薄钢板剪力墙相结合而构成的一种新型抗侧力体系。后张拉梁柱节点和柱脚节点提供复位能力,减小结构震后残余变形,内填钢板则是主要的抗侧力元件和耗能元件。地震后通过更换钢板可使结构恢复正常使用功能。建立了自复位钢板剪力墙有限元模型进行水平加载分析,研究了内填钢板和边缘框架的相互作用,以及内填钢板的厚度和跨高比对自复位钢板剪力墙强度、刚度、滞回性能及耗能能力的影响。分析结果表明,自复位钢板剪力墙的塑性变形发生在内填钢板上,边缘构件保持弹性以提供复位能力。随着钢板厚度和跨高比增大 ...
罗小奇, 陈麟, 吴珊瑚
doaj
Formation and catastrophic evolution of giant landslides in the alpine canyon area of western China [PDF]
Objective Most hydroelectric projects in western China are located in alpine canyons. The intricate geological engineering conditions in this area have contributed to the widespread distribution of landslide disasters across the reservoir banks of ...
HU Xinli +7 more
core +1 more source