Results 71 to 80 of about 18,303 (165)
Third-party audit and optimization design of high-rise structure beyond code-specification of one hotel tower [PDF]
, 2016 某酒店塔楼是一栋180m(含3层避难层)的超限高层建筑,采用框架-核心筒结构,在34层位置有结构转换。在对结构设计进行结构体系、结构布置、构件设计和施工图设计审核的基础上,从主体框架-核心筒结构体系的构件布置和构件设计、楼盖体系的布置和构件设计、荷载取值、计算配筋和施工图配筋等方面进行了结构设计优化。采用盈建科、SATWE、MIDAS Building等多种计算软件进行了小震下结构整体内力位移分析;采用EPDA&PUSH对结构在大震下的整体内力位移进行了分析计算。立足规范和结构性能要求 ...
杨信, 石建光, 陈家伟
core
Failure mechanisms and compensation support technology of deep high-stress soft rock roadways [PDF]
Stress redistribution of deep excavation rock mass is a complex mechanical problem of multiple stresses. First, the mechanical model of surrounding rock at the moment of excavation of deep high-stress soft rock roadways was established based on the ...
Chenyang LIU +10 more
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Jianzhu Gangjiegou Jinzhan, 2003 焊接高强钢盖板的预应力钢梁构造简单,刚度较大,节约钢材,是一种值得推广的结构型式。本文介绍了这类预应力钢梁制造方法和计算方法,并通过工程实例说明其应用方法和经济效果。
李秉南, 殷惠光, 孙宝俊
doaj
Jianzhu Gangjiegou Jinzhan, 2022 预应力波纹腹板开孔组合梁力学性能不同于普通平腹板开孔组合梁。为研究腹板开孔对预应力波纹钢-混凝土组合梁抗火性能的影响，采用有限元软件ABAQUS对该类组合梁在高温作用下的力学性能进行非线性有限元分析，重点考察了预应力波纹腹板开孔组合梁的内力、跨中挠度以及破坏模式，并对其耐火性能进行了参数研究。结果表明：孔洞所在截面波纹腹板剪应力呈非均匀分布，临界状态时，该截面腹板基本丧失抗剪能力。预应力波纹腹板组合梁纯弯区开孔时，其破坏模式与无孔组合梁一致，均为弯曲破坏，孔洞基本不影响其跨中挠度与耐火性能 ...
周焕廷, 陈祥, 伍先兴
doaj
Theory and application of mining mechanics and strata control [PDF]
Studying the dynamic response of rock mass mining and strata control technology is of great significance for promoting safe and efficient coal production and ensuring stable energy supply.
Jinquan JIANG +4 more
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Shiyou jixie, 2012 为了对水力深穿透射孔技术实施后的效果进行预测，提出了水力深穿透射孔应用效果的预测方法。将水力深穿透射孔近似看作1组多分支水平井，每一个水平孔相当于一个分支水平井，利用评价水平井产能的方法对其进行定量预测，并结合其在辽河油田应用的数据进行了验证。应用效果跟踪和定量分析结果表明，水力深穿透射孔适用于产量下降后的解堵增产或水井的解堵增注；水力深穿透射孔在薄油层应用的效果比厚油层效果好，在污染严重的地层比在污染轻微的地层应用效果好。
谭多鸿
doaj
Study on Structural Behavior of Through and Half-through Arch Bridge Based on CFRP Suspenders [PDF]
, 2017 中下承式拱桥的吊杆长期处于复杂机械振动和大气等作用下，容易受到疲劳与腐蚀等作用的影响而破坏失效。由于碳纤维(CFRP)的抗腐蚀、耐疲劳等特性恰好可以弥补钢材的这些缺点，因而可考虑将钢受拉构件替换成CFRP构件，避免此类问题的发生，并有效降低使用过程中的维护保养成本。另外CFRP材料高强度、轻质量的特点，满足了设计建造超大跨径桥梁和新型结构形式桥梁的要求。本文主要分析了CFRP受拉构件的替换对系杆拱桥结构性能的影响，并针对目前CFRP索的材料性能以及在实际工程应用中的问题，提出了相应解决方案 ...
赵斌
core
Jianzhu Gangjiegou Jinzhan预应力撑杆构件造型优美、省材高效，但由于其柔度较大，易产生多个屈曲模态交互耦合即“交互屈曲”模式的破坏，且交互屈曲对其极限承载力、屈曲性能影响显著。研究了交互屈曲对预应力对称、不对称撑杆构件轴压、压弯作用下的屈曲性能、极限承载力影响，并据此采用基于回归算法的人工神经网络建立了其极限承载力估计模型。研究结果表明，对于预应力撑杆构件，模态交互易造成不稳定后屈曲，且对其极限承载力有显著的削弱效应；该削弱效应是否产生影响由结构几何参数与参与交互的模态屈曲荷载决定，其削弱程度受结构撑杆不对称性、预应力水平影响 ...
毋凯冬, 李国强, 常好诵, 邢哲
doaj
Nikola Hajdin: the most important scientific and professional accomplishments in foreign literature commentaries : on the occasion of his eighty-fifth birthday [PDF]
, 2010 During his long scientific and professional activity spanning over half a century and going through different phases, professor Nikola Hajdin obtained results of greater or lesser significance depending on the state of development of science and ...
Marković, Nenad +2 more
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Fracture distribution and deformation mechanism of surrounding rock in two-way extremely unequal pressure soft rock roadway [PDF]
The failure of butterfly plastic zone in roadway surrounding rock is an important reason for the large deformation of roadway surrounding rock. In recent years, it has attracted the attention of roadway support workers.
Chao YUAN +5 more
core +1 more source