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Key technical innovations in the construction of Baihetan Hydropower Station Project
《工程管理前沿(英文)》 2023年 第10卷 第2期 页码 367-372 doi: 10.1007/s42524-023-0253-5
关键词: ultra-high arch dam columnar jointed basalt low-heat cement concrete temperature controlled crack prevention million-kilowatt unit intelligent construction
杨富瀛,冯晓琳,李晓萍
《中国工程科学》 2013年 第15卷 第9期 页码 55-58
三峡升船机塔柱结构复杂,属于高层薄壁结构,混凝土温度受环境温度影响较大,其混凝土温控难度极大。在施工实践中,通过优化混凝土配合比、合理布置混凝土冷却系统、科学调控冷却水温度与通水时间,科学调整外部环境温度、同时引进混凝土养护新材料、新工艺,并且加强对温控的施工管理等措施,保证了塔柱混凝土的施工质量,证明了温控方案的科学合理性。三峡升船机塔柱混凝土温控防裂技术对研究国内外升船机工程温控措施技术水平,提高水电工程混凝土施工质量,节省工程造价等具有重要的参考价值。
黄耀英,丁月梅,吕晓曼,徐佰林
《中国工程科学》 2014年 第16卷 第3期 页码 59-63
闸墩混凝土温控防裂是一个与温控措施和材料参数相关的复杂多因素系统优选问题,本文尝试已知混凝土热力学材料参数情况下的温控措施优选,将闸墩混凝土结构内部和表面主拉应力历时曲线和抗拉强度增长曲线关系的最小值作为输入,闸墩表面保温效果、浇筑温度、通水水温、通水时间作为输出,建立了温控措施优选的神经网络模型,采用均匀设计原理进行温控参数组合,并采用水管冷却有限元法仿真分析含冷却水管的闸墩混凝土结构温度场和徐变应力场,获得样本进行学习,以此训练好的网络描述结构主拉应力历时曲线和抗拉强度增长曲线关系的最小值与不同温控措施的非线性关系。将合适的结构主拉应力历时曲线和抗拉强度增长曲线关系的最小值输入训练好的网络,可自动优选出温控防裂措施。算例分析表明,本文建立的温控措施优选神经网络模型是可行的。
Crack detection for wading-concrete structures using water irrigation and electric heating
《结构与土木工程前沿(英文)》 2023年 第17卷 第3期 页码 368-377 doi: 10.1007/s11709-022-0926-x
关键词: structural health monitoring underwater concrete structure fiber Bragg grating crack detection temperature tracer method
A. SHAFIEI
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 527-535 doi: 10.1007/s11709-018-0450-1
关键词: peridynamics inclined crack dynamic fracture crack branching
Juichen YANG,Hong CHEN,Yuan YUAN,Debanjan SARKAR,Jie ZHENG
《化学科学与工程前沿(英文)》 2014年 第8卷 第4期 页码 498-510 doi: 10.1007/s11705-014-1451-9
关键词: phase structure degradation polyurethanes controlled release drug delivery
Peridynamics versus XFEM: a comparative study for quasi-static crack problems
Jinhai ZHAO, Hesheng TANG, Songtao XUE
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 548-557 doi: 10.1007/s11709-017-0434-6
关键词: XFEM peridynamic bilateral crack parallel double cracks nonlocal theory
Correlation between tension softening relation and crack extension resistance in concrete
Xiufang ZHANG , Shilang XU ,
《结构与土木工程前沿(英文)》 2009年 第3卷 第3期 页码 323-329 doi: 10.1007/s11709-009-0041-2
关键词: concrete fracture process zone crack extension GR resistance tension softening curve
Fracture resistance on aggregate bridging crack in concrete
ZHANG Xiufang, XU Shilang
《结构与土木工程前沿(英文)》 2007年 第1卷 第1期 页码 63-70 doi: 10.1007/s11709-007-0006-2
Stability and dynamics of rotor system with 45° slant crack on shaft
Yanli LIN, Xiaohui SI, Fulei CHU
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 203-213 doi: 10.1007/s11465-011-0131-4
Crack on a shaft is one of the common damages in a rotor system. In this paper, transverse vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor system. Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaft is larger than that with a transverse crack when the two types of crack have the same depth and the rotor system runs in the same condition. Stability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft under torsional excitation are analyzed by considering opening and closing of the crack. It is shown that the instability of the transverse vibration of the rotor system increases with increasing difference between the bending stiffness in two main directions, and the vibration is stable when the two bending stiffness are identical. The spectrum analysis of the steady-state response reveals that the gravity and the eccentricity produce different frequency components, and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation disappear. Further investigation shows that the vibration amplitudes in combined frequencies increase rapidly in transversal, torsional, and axial vibration with increasing slant crack depth. The results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack on a shaft and can be used for the detection of the slant crack on a shaft.
关键词: rotor dynamics slant crack stability torsional excitation open and close
Study on the cohesion and adhesion of hot-poured crack sealants
Meng GUO, Yiqiu TAN, Xuesong DU, Zhaofeng LV
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 353-359 doi: 10.1007/s11709-017-0400-3
关键词: crack sealant concrete pavement cohesion adhesion moisture damage
Mahdi AREZOUMANDI
《结构与土木工程前沿(英文)》 2015年 第9卷 第1期 页码 91-103 doi: 10.1007/s11709-015-0274-1
关键词: bridge deck crack fiber shrinkage shrinkage reducing admixture
Concurrent fatigue crack growth simulation using extended finite element method
Zizi LU, Yongming LIU,
《结构与土木工程前沿(英文)》 2010年 第4卷 第3期 页码 339-347 doi: 10.1007/s11709-010-0078-2
关键词: small time scale model extended finite element method (X-FEM) crack growth multiaxial
Jorge Alberto Rodriguez DURAN,Ronney Mancebo BOLOY,Rafael Raider LEONI
《机械工程前沿(英文)》 2015年 第10卷 第3期 页码 255-262 doi: 10.1007/s11465-015-0342-1
The well-known fatigue crack growth (FCG) curves are two-parameter dependents. The range of the stress intensity factor ?K and the load ratio R are the parameters normally used for describing these curves. For engineering purposes, the mathematical representation of these curves should be integrated between the initial and final crack sizes in order to obtain the safety factors for stresses and life. First of all, it is necessary to reduce the dependence of the FCG curves to only one parameter. ?K is almost always selected and, in these conditions, considered as the crack driving force. Using experimental data from literature, the present paper shows how to perform multiple regression analyses using the traditional Walker approach and the more recent unified approach. The correlations so obtained are graphically analyzed in three dimensions. Numerical examples of crack growth analysis for cracks growing under nominal stresses of constant amplitude in smooth and notched geometries are performed, assuming an identical material component as that of the available experimental data. The resulting curves of crack size versus number of cycles (a vs. N) are then compared. The two models give approximately the same (a vs. N) curves in both geometries. Differences between the behaviors of the (avs. N) curves in smooth and notched geometries are highlighted, and the reasons for these particular behaviors are discussed.
关键词: fatigue crack propagation modeling life prediction mean stress effects
Stress field near circular-arc interface crack tip based on electric saturation concept
Longchao DAI, Xinwei WANG
《机械工程前沿(英文)》 2009年 第4卷 第3期 页码 320-325 doi: 10.1007/s11465-009-0042-9
关键词: piezoelectric material arc crack strip saturation stress intensity factor
标题 作者 时间 类型 操作
Dynamic crack propagation in plates weakened by inclined cracks: an investigation based on peridynamics
A. SHAFIEI
期刊论文
Synthesis and characterization of biocompatible polyurethanes for controlled release of hydrophobic and
Juichen YANG,Hong CHEN,Yuan YUAN,Debanjan SARKAR,Jie ZHENG
期刊论文
Peridynamics versus XFEM: a comparative study for quasi-static crack problems
Jinhai ZHAO, Hesheng TANG, Songtao XUE
期刊论文
Correlation between tension softening relation and crack extension resistance in concrete
Xiufang ZHANG , Shilang XU ,
期刊论文
Stability and dynamics of rotor system with 45° slant crack on shaft
Yanli LIN, Xiaohui SI, Fulei CHU
期刊论文
Study on the cohesion and adhesion of hot-poured crack sealants
Meng GUO, Yiqiu TAN, Xuesong DU, Zhaofeng LV
期刊论文
Feasibility of crack free reinforced concrete bridge deck from materials composition perspective: a state
Mahdi AREZOUMANDI
期刊论文
Concurrent fatigue crack growth simulation using extended finite element method
Zizi LU, Yongming LIU,
期刊论文
Some remarks on the engineering application of the fatigue crack growth approach under nonzero mean loads
Jorge Alberto Rodriguez DURAN,Ronney Mancebo BOLOY,Rafael Raider LEONI
期刊论文