Wang Y.,Tsinghua University |
Zhou H.,Tsinghua University |
Shi Y.,Tsinghua University |
Wu Y.,Capital Engineering and Research Incorporation Ltd
Qinghua Daxue Xuebao/Journal of Tsinghua University | Year: 2013
An evaluation approach based on crack extension resistance curves was developed to accurately predict fractures of steel structural components. The crack extension resistance curve parameters for structural steels were calibrated using data regression and theoretical analyses based on crack tip opening displacement (CTOD) tests at low temperature carried out earlier by the authors. The crack extension resistance curves are then related to the fracture modes of steel components with cracks. The results indicate that steel components with crack lengths longer than the critical size having a positively sloped crack extension resistance curve in steel material toughness will fracture in the ductile mode while those with crack lengths shorter than the critical size having a positively sloped resistance curve or having a horizontal resistance curve will fracture in the brittle mode. The crack extension length corresponding to the maximum load calculated by this theoretical model agrees well with the test results, validating that the theoretical analysis is accurate and can be applied in fracture resistant designs of steel structural components.
Cao H.-L.,Tongji University |
Cao H.-L.,Capital Engineering and Research Incorporation Ltd |
Quan Y.,Tongji University |
Gu M.,Tongji University
Gongcheng Lixue/Engineering Mechanics | Year: 2013
In order to study the effects of chamfered, slotted, and tapered cross-sections on across-wind aerodynamic damping ratio of super-high-rise building, 10 aeroelastic model tests were conducted in the TJ-1 wind tunnel at Tongji University. The random decrement technique was used to evaluate across-wind aerodynamic damping ratios. The accuracy of the evaluated results was verified through comparison with previous research achievements. Results indicated that modifications of cross-sections are not always effective in suppressing the aerodynamic effects of tall buildings. Chamfer ratios from 5% to 20%, slot ratios from 5% to 10%, and taper ratio of 1% significantly decrease the magnitudes of absolute aerodynamic damping ratios. Slot ratio of 20%, and taper ratios from 3% to 5% increase wind-induced responses through changing the aerodynamic damping ratios. Based on the findings, empirical aerodynamic damping function parameters are fitted for aerodynamic damping ratios of high-rise buildings with aerodynamically modified square cross-sections at low reduced wind velocities.
Zhang J.,Beijing Jiaotong University |
Han B.,Beijing Jiaotong University |
Yang J.,Capital Engineering and Research Incorporation Ltd
Advanced Materials Research | Year: 2011
This paper presents researches on the technique for testing water content and moisture field in concrete by GPR. Through the experiments, a discussion has been carried out on the variation of velocity of radar waves and the relative dielectric constants in the concrete with different water content. Comparing the results of air drying and drying experiment, an equation is given to reflect the relation between the water content in the concrete and the radar speed of radar waves in the concrete, also the relative dielectric constants of concrete. Some suggestions are proposed for the actual concrete water content test by using Ground Penetrating Radar (GPR). © (2011) Trans Tech Publications, Switzerland.
Zheng W.-H.,ACRE Coking and Refractory Engineering Consulting Corporation Dalian |
Wen Y.-M.,Committee of Experts |
Zheng B.,Capital Engineering and Research Incorporation Ltd.
Kang T'ieh/Iron and Steel | Year: 2016
China's current steel production and consumption has entered the peak platform area, influenced by which, China's coke production and consumption has also entered the peak plateau region. As a result of excess capacity, extensive development, increasing environment pressure, lack of innovation, the industrial structure of coking industry in China is stepping into the in-depth adjustment period. In this circumstance of unprecedented difficulties applied on many businesses, it is essential to commence an intensive research on the positive and negative factors affecting the development of coking industry by analyzing the trend, transforming development patterns, changing motive force of growth and adopting countermeasures to improve value integration capability to reverse the passive situation and realize a sustainable development for the coking industry. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.
Miao L.,University of Science and Technology Beijing |
Miao L.,Capital Engineering and Research Incorporation Ltd |
Chen X.,University of Science and Technology Beijing |
Zhao S.,University of Science and Technology Beijing |
Bai Z.,University of Science and Technology Beijing
International Journal of Sensor Networks | Year: 2014
This paper presents a multi-source data fusion model method which could improve the blast furnace (BF) burden surface model accuracy. First, the three sections of straight line are used to describe the cross section of BF burden surface, and apply the motion law of the furnace burden to constrain the specific parameters of the three sections of straight line. Secondly, a multi-source data fusion method based on co-universal kriging estimation method is proposed. The temperature and height data are combined to build the unbiased estimation for the burden surface shape. Finally, an example of surface shape model using our proposed method in a 2500 m3 BF of a steel plant is discussed. The application shows that, contrasted with the traditional model, the model accuracy has arisen by 8%, and the resolution of surface shape has arisen by 0.32. The novel method can provide necessary guidance for energy saving and emission reduction in operation of the BF. Copyright © 2014 Inderscience Enterprises Ltd.
Wenyu D.,Capital Engineering and Research Incorporation Ltd. |
Haibo Y.,The MCC Group
2015 International Conference on Logistics, Informatics and Service Science, LISS 2015 | Year: 2015
Based on geological predictions of 21 tunnels on the Baise-Jingxi Freeway, this paper systematically analyzes and summarizes the performance of a combined use of three geophysical techniques (tunnel seismic prospecting (TSP), geological radar, and infrared exploration of water). Furthermore, two successful prediction examples were used to elucidate the application of the integrated geological prediction. The results indicated that, based on geophysical analysis, rational combinations of different geophysical techniques are more effective and accurate because each of them utilizes different principles and has its own merits. The statistical data of the geological predictions of the Bai-Jing Freeway verified the superior performance of the proposed approach. The prediction of faults and joint zones has an accuracy of approximately 72-90%. For karst caves, underground rivers and karst conduits, the accuracies are mostly in the range of 60-80%. The interpretation of surrounding rock classification can reach an accuracy of 80%. © 2015 IEEE.
Peng Q.,China Electric Power Research Institute |
Li J.,China Electric Power Research Institute |
Bian P.,China Electric Power Research Institute |
Kang D.,China Electric Power Research Institute |
Shan Z.,Capital Engineering and Research Incorporation Ltd
Dianwang Jishu/Power System Technology | Year: 2010
Advantages and disadvantages of three existing methods to calculate lightning shielding failure are analyzed. The electrical geometry model method is improved to solve the coordinates of intersection point of striking distance curves while the incident direction of is perpendicular to ground; according to the change of incidence angle of lightning current, then the intersection point is mapped to different geometric spaces; and then based on actual striking distance curves the coordinates of intersection point are modified to solve the trip-out rate due to lightning shielding failure. Calculation results show that the improved electrical geometry model method is more accurate than traditional methods. Finally, applying the improved method the influences of ground wire protection angle, tower height, cross arm length of middle phase and layer space on lightning shielding failure-caused trip-out rate of 1000 kV power transmission line are analyzed.
Wang L.,Capital Engineering and Research Incorporation Ltd |
Cheng L.,Capital Engineering and Research Incorporation Ltd
Advanced Materials Research | Year: 2011
This paper presents the modelling and simulation of automatic position control (APC) in an 8-high cold rolling mill hydraulic system built by CERI (Capital Engineering and Research Incorporation). Key feature of the rolling mill APC system is introduced. From modelling, the servo valve and cylinder models are built, and from simulation the dynamic response of the system can be predicted for selecting system components and optimizing system performance. As system dynamic response is not only depending on the servo valve but also on all components in the system, root locus method is applied to analyze APC system dynamic response. Simulation results with different parameters are compared. Additionally, compared with a 6-high cold rolling mill APC system, the APC system dynamic responses of CERI 8-high rolling mill can reach better results than those obtained in the 6-high rolling mill system. © (2011) Trans Tech Publications.
Liu P.,Capital Engineering and Research Incorporation Ltd |
Li H.,Capital Engineering and Research Incorporation Ltd |
Shen Z.,Capital Engineering and Research Incorporation Ltd
Advanced Materials Research | Year: 2012
This paper focuses on a new type of 8-roll cold rolling mill with the back-up bearing roll. Compared to the traditional 6-roll cold rolling mill, a thick-walled bearing roll is used to multi-support the intermediate roll. By the rack, the fan-shaped gears, the eccentric core shaft and the servo-cylinder, the work roll can be pushed down by this screw down device on the top of the mill; By contrast with the 4(6)-roll mill, this type of mill has some characteristics, such as: the small size of rolls, lighter weight, the fast response for the screw down. The bearing roll is fixed by the supporting blocks placed on the rolling-mill housing. So this mill has large traverse rigidity, and this is propitious to the flatness control. By different means of strip flatness adjustments, such as the intermediate roll shifting, the roll bending and the bearing roll adjusting, the strip flatness can be well controlled. The oil-gas lubrication is used in the bearings of the bearing rolls, and the changing rolls equipment is designed for this type of mill too. A series of this type of mills (as 450, 800, 1250, 1450 series) have been produced since it was developed in 1997. The mills for 1250 and 1450 series have been applied in five-stand cold rolling mill and single stand reversing mill, a rolling speed of 800m/min has been. © (2012) Trans Tech Publications, Switzerland.
Wang Y.-Q.,Capital Engineering and Research Incorporation Ltd |
Ge Y.-B.,Capital Engineering and Research Incorporation Ltd
Kang T'ieh/Iron and Steel (Peking) | Year: 2010
Reladling station layout includes two main patterns, which are parallel/landscape orientation layout and vertical/longitudinal layout. From the point of interface technology, technical character, hot metal turnover time, hot metal accepting capacity, occupancy factor of crane and number of reladling pits have been studied. From the point of engineering technology, steel structure and concrete structure and project investment of the two patterns have been discussed. Result shows that the two patterns can all satisfy reladling operation, while coordinating and buffering capacity of parallel pattern is better than that of vertical ones and the construction cost of vertical pattern is a little higher than that of parallel ones.