Wu D.,Tongji University |
Shao B.,Tongji University |
Feng Y.,Sichuan Provincial Architectural Design and Research Institute |
Ma L.,Tongji University
Environmental Technology (United Kingdom) | Year: 2015
The ferrous hydroxy complex (FHC), composed of structural FeII, has been shown to reduce a range of organic and inorganic contaminants. This study focused on the catalytic effects of Cu2+, Ag+, or Pd2+ on the reactivity of FHC suspensions towards 2,5-debromination (2,5-DBA). It was found that the target compound (2,5-DBA, 50 mg/L) could hardly be debrominated by FHC alone. However, Cu2+, Ag+, or Pd2+ had a significant promotion effect on the catalytic reactivity of structural FeII on 2,5-DBA reduction. Pd2+ exhibited the best catalytic activity followed by Ag+ and Cu2+ in this study and the reductive debromination by Pd/FHC and Ag/FHC followed the pseudo-first-order kinetic model. Products distribution was highly dependent on the metal ions used. A reaction pathway was proposed in which the by-products were produced by hydrogenolysis and the elution order of bromines depended on the metal ions used. The enhanced reduction of 2,5-DBA by FHC suspensions modified by metal ions may prove useful in the development of improved materials for the treatment of halogenated organic compounds. © 2014 Taylor and Francis.
Yang W.-S.,Qingdao Technological University |
Guo X.,Institute of Disaster Prevention |
Xu W.-X.,Qingdao Technological University |
Yuan X.,Sichuan Provincial Architectural Design and Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015
Attaching wing walls is a common measure in the seismic retrofit of RC frames. A 7-story RC frame designed in accordance with the conventional design norm was taken as an example to study the seismic behaviors of this kind of combined systems. A pushover analysis and a 1:4 scale shaking table test were performed. The results show that the lateral resistance of the structure is enhanced, the distribution of story drifts becomes more uniform and the realization of “strong column-weak beam” yield mechanism is facilitated based on the attached wing walls. The damage procedure observed during the tests show that wing walls will damage at first to dissipate the seismic energy. In the extreme shaking condition, the reinforcement at the bottom of wing walls is buckled first of all, while the reinforcement at the bottom of columns has not yet reached the yielding strain state. It is proved that wing walls can protect the frame columns and an extra seismic fortification line is achieved. © 2015, Chinese Vibration Engineering Society. All right reserved.
Fu J.,Chongqing University |
Zhao S.,Sichuan Provincial Architectural Design and Research Institute |
Chen G.,Sichuan Provincial Architectural Design and Research Institute |
Zhang C.,Chongqing University |
And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015
According to the simulation analysis of mechanical behavior of five lattice type steel reinforced concrete columns and one full-web type steel reinforced concrete column subjected to horizontal low-cycle repeated loading, it was proved that the finite element analysis program, OpenSees, can be used to study the factors and disciplines which may affect the ductility behaviors of such kinds of columns. Based on the OpenSees, the parametric study was conducted on the main factors which may affect the ductility property of lattice steel reinforced concrete columns. The results show that: the ductility performance of lattice steel reinforced concrete columns may increase with the increase of volume stirrup ratio and steel ratio, but it may decrease with the increase of steel strength and axial compression ratio; The horizontal bearing capacity of lattice steel reinforced concrete columns may increase with the increase of steel strength and steel ratio, while a limited change in it may be observed with the increase of volume stirrup ratio. Once the parameter study was accomplished, by using the MATLAB toolbox to conduct the multivariant non-linear regression analysis, the ultimate drift angle formula of lattice steel reinforced concrete column subjected to eccentric load can be obtained based on the volume stirrup ratio, steel ratio, steel strength, concrete strength and axial compression ratio. Furthermore, the formula was validated by the collected experimental results. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.