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Zhou S.,China University of Mining and Technology | Zhou S.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | Lu H.,China University of Mining and Technology | Lu H.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | And 2 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2016

The middle (seriously) deteriorated beams were strengthened with CFRP and the flexural behaviors were tested. The coupling effect of concrete deterioration and rebar corrosion on the strengthening efficiency was studied, and the influences of deterioration degree and CFRP amount on the strengthening effect were discussed. The results show that two typical failure modes were found when the beams under the ultimate flexural load, tensile failure of CFRP and shear fracture of the bonding layer. At the initial stage of loading, the plane section assumption was applicable, but it disabled at the later stage when it fragilely destroyed. The displacement ductility factor μ△ decreased slowly as the deterioration of RC beams increased. The tensile stress of CFRP was less than its limit value when the beam failed. Calculation models corresponding to the failure modes were established based on the test results and theoretical analysis. The influence of CFRP amount on strengthening effect was analyzed, and then the determining method of strengthening time was proposed. © 2016, Editorial Board of Journal of CUMT. All right reserved.


Wu Y.,China University of Mining and Technology | Wu Y.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | Lu H.,China University of Mining and Technology | Lu H.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2015

The failure modes, expansive crack width, flexural carrying capacity and load-deflection curves were studied based on the artificial environment. The coupling effects of rebar corrosion and concrete deterioration were focused on. The results show that expansive crack is not detected when the corrosion of rebar is below 3.27 percent, and the main failure mode is crushing of compressive concrete. The carrying strength decreases rapidly with the corrosion increasing. After the cracks appearing, the failure mode changes to the yield of rebar, but the carrying strength decreases slowly. As the deterioration of beams increasing, the peak value and slope of load-deflection reduce. The concrete cracks because of the corroded rebar, and the binding force of concrete to the rebar decreases. The coupling effects promote the degradation of the bond between them. And then the flexural behavior of beams decreases. The experimental phenomena was analyzed with theory, and the results of test and calculation were compared. ©, 2015, China University of Mining and Technology. All right reserved.


Ding B.-D.,State Key Laboratory for Geomechanics & Deep Underground Engineering | Ding B.-D.,China University of Mining and Technology | Ding B.-D.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | Lu H.-L.,State Key Laboratory for Geomechanics & Deep Underground Engineering | And 7 more authors.
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2015

Through the experiment for a single-layer cylindrical reticulated shell under impact forces, this paper is intended to study the dynamic response and the dynamic stability of a single-layer cylindrical reticulated shell. The time history plots of the impact force, axial stress, node displacements and accelerations have been obtained using the dynamic strain gauge, force sensor, displacement sensor and acceleration sensors. According to the corresponding relationship between the different impact force amplitudes and the measured point displacements, the failure modes and forms of the reticulated shell model in terms of the dynamic stability are analyzed and the stability bearing capacity is determined. The results show that the impact force on the model takes the shape of triangular impulse and the acting periods of the impact vary from 15 to 30 ms, whose amplitude and width increase with the impact force and both are closely related with the model stiffness. There are global and local sensitivity rods for cylindrical reticulated shell under impact loads, which show strong shock resistance ability at post buckling while no continuous fracture under the vertex vertical impact. The detailed test model is established based on ANSYS/LS-DYNA in which the failure mode of the single-layer cylindrical reticulated shell has been simulated. After comparing the simulation results with the experimental results, the validity of the numerical simulation method is verified. © 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.


Han C.,China University of Mining and Technology | Han C.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | Wang D.,China University of Mining and Technology | Wang D.,Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology | And 4 more authors.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2016

In market economy-oriented society, realization of architectural design innovation requires the joint efforts of construction investment units (customer) and architects. In architectural design innovation activities, the attitude of architects faced with the innovation risk is an important factor in achieving architectural design innovation, and the construction investment units generally prompt the architects to overcome innovation risk and ensure the effective realization of architectural design innovation through two means of external incentives and supervision. Using the mathematical model to explore the architectural design innovation risk and effectiveness issues of external incentives and supervision, can reveal the effective factors of realization the architectural design innovation, and provide the guidance and advice for further research and promoting architectural design innovation. © 2016, Editorial Office of Journal of Xi'an University of Architecture & Technology. All right reserved.

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