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Liu C.,Xian University of Architecture and Technology | Bai G.,Xian University of Architecture and Technology | Jia S.,Xian University of Architecture and Technology | Yin L.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The low-cycle repeated loading tests were carried out for recycled aggregate concrete joints with recycled replace rate 0, 50%, 100% and different axial compression ratios. The tests were designed to investigate the joint failure modes, hysteretic characteristics, ductility and energy dissipation behavior between the normal concrete joint and recycled aggregate concrete joints with different recycled replace rate. Results show that the mechanical and failure process of recycled concrete frame joints may be composed of four stages: the initial cracking, the thorough cracking, the ultimate stage and the failure stage. It is found that the recycled concrete frame joints are similar to the normal concrete joint in the hysteretic characteristics, joint deformation and energy dissipation behavior, but the recycled concrete joints are inferior to the latter according to the quantitative comparative analysis. The shear capacity of recycled concrete joints may increase with the axial compression ratio, leading to the increased brittle response, decreased ductility, and poor deformation performance. The recycled concrete joints can be applied to the seismic fortification concrete structures, but it is recommended that the appropriate axial compression ratio and the increased stirrup ratio for core area should be adopted to enhance the shear capacity.


Liu C.,Xian University of Architecture and Technology | Bai G.-L.,Xian University of Architecture and Technology | Yin L.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co.
Gongcheng Lixue/Engineering Mechanics | Year: 2014

Based on long-term crack width experiments on recycled aggregate concrete(RAC) beams with different recycled material replacement rates, the development of crack widths over time between the different beams was compared. The results show that the period of rapid cracking growth is postponed in recycled aggregate concrete beams, and also of longer duration than in normal concrete beams. The internal lever arm coefficient, average crack spacing, and steel strain non-uniformity coefficient were fitted, and a formula for calculating maximum short-term crack width is established. Its calculation results have satisfactory precision. After analyzing additional crack width time-varying coefficients, formula for maximum crack width an RAC beam with varying replacement rates is established.


Tan J.,Nanjing Southeast University | Tan J.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co. | Wang B.,Nanjing Southeast University | Li Y.,Nanjing Southeast University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

Assessment of the comprehensive value of the demand response resources is beneficial to the implementing agency in grasping the implementation effect of demand project and to the participants in learning about their input and returns. System dynamics provides a more systematic method, better dynamics and more distinct causal feedback relations for comprehensive benefits evaluation of the demand response. After defining the participants and implementation costs and benefits of the demand response and the effect of external returns, attention is focused on access to renewable energy and electric vehicles. Then an elaborate simulation model containing price-based and incentive-based programs is developed. The rationality and effectiveness of the model is verified by simulation. All participants benefit from demand response programs and interact with each other. External benefits internalized help promote comprehensive performance of the demand response. © 2014 State Grid Electric Power Research Institute Press


Zong Z.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co.
Applied Mechanics and Materials | Year: 2013

In the complex grid market environment, inhibiting the malicious behavior of grid nodes, taking punishment and incentives and guaranteeing the quality of the grid service are all important issues, which are must be resolved by the grid service market. This paper analyses the framework of the virtual network trust module. Combined with virtual domains combinatorial auction introduced into the process of trust building, this paper proposes a trust module, which finds the efficiency of trust and acts a good inhibition of a single malicious mode behavior. © (2013) Trans Tech Publications, Switzerland.


Jing D.-H.,Nanjing Southeast University | Cao S.-Y.,Nanjing Southeast University | Zhou H.-T.,Jiangsu Posts and Telecommunications Planning and Designing Institute Co.
Advanced Materials Research | Year: 2011

The steel-plate-masonry composite structure is an innovative type of structural scheme popular in masonry structures with load-bearing walls removed for a large space. A total of 4 column specimens under static loading were tested to mainly study the failure modes, load-carrying capacity, and strain distribution in the critical cross-section. Results show that the composite columns started an initial failure from local buckling of the steel plate located between binding bolts; the main factors influencing load-carrying capacity included thickness of the steel plate, type of injected material, and initial column eccentricity; the working performance of the composite column with epoxy adhesive was better than that with cement grout; and re-distribution of compressive stress existed in the steel plates of the column. Also, the ratio of service load-carrying capacity to ultimate capacity of the steel-plate-masonry composite column is about 70%. © (2011) Trans Tech Publications, Switzerland.

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