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Yang W.,Qingdao Technological University | Guo X.,Institute of Disaster Prevention | Xu W.,Qingdao Technological University | Yuan X.,Sichuan Provincial Architectural Design and Research Institute
Earthquake Engineering and Engineering Vibration | Year: 2016

A building retrofitted with wing walls in the bottom story, which was damaged during the 2008 M8.0 Wenchuan earthquake in China, is introduced and a corresponding 1/4 scale wing wall-frame model was subjected to shake table motions to study the seismic behavior of this retrofitted structural system. The results show that wing walls can effectively protect columns from damage by moving areas that bear reciprocating tension and compression to the sections of the wing walls, thus achieving an extra measure of seismic fortification. A ‘strong column-weak beam’ mechanism was realized, the flexural rigidity of the vertical member was strengthened, and a more uniform distribution of deformation among all the stories was measured. In addition, the joint between the wing walls and the beams suffered severe damage during the tests, due to an area of local stress concentration. A longer area of intensive stirrup is suggested in the end of the beams. © 2016, Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.


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.


Lou M.-L.,Tongji University | Dong Y.,Sichuan Provincial Architectural Design and Research Institute | Zhang R.-L.,Qingdao University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

Based on the case study of a large-scale immersed tunnel and the previous research results, several problems in establishing the refined local model for seismic response analysis of the immersed tunnel are discussed emphatically as follows: (1) problem of model range size, (2) simplified method for hydrodynamic action of overlying water body, (3) the proper model of damping matrix in time domain and its effect, (4) selection of seismic input mode and its effect. The reasonable way for three-dimensional refined local modeling of the immersed tunnel is verified by engineering examples. The numerical results show that when the seismic responses of an immersed tunnel pipe is investigated carefully, at least the influence of other three pipes at two sides of the pipe must be considered and the effect of the limited soil layer whose horizontal length is at least 5 times the thickness of the soil layer at two sides of the pipe should be included. The method of equivalent additional mass can be used to simulate the overlying water body. When the fundamental frequency of the immersed tunnel-soil layer system is lower than the predominate frequencies of the input seismic wave, the ratio coefficients of the Rayleigh proportional damping matrix are determined by the optimization method based on the fundamental frequency of the system. It should be fully noted that the excitation of multi-support seismic input along tunnel axis has a great influence on the seismic response of the immersed tunnel. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.


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.


PubMed | University of Sichuan and Sichuan Provincial Architectural Design and Research Institute
Type: Journal Article | Journal: PloS one | Year: 2016

In this study, two short precast concrete columns and two cast-in-situ concrete columns were tested under cyclic loads. It was shown that the sleeve grouted connection was equivalent to the cast-in-situ connections for short columns when the axial compression ratio was 0.6. In order to determine the influence of the axial compression ratio and the shear-span ratio on the shear capacity of the horizontal joint, a FE model was established and verified. The analysis showed that the axial compression ratio is advantageous to the joint and the shear capacity of the horizontal joint increases with increase of the shear-span ratio. Based on the results, the methods used to estimate the shear capacity of horizontal joints in the Chinese Specification and the Japanese Guidelines are discussed and it was found that both overestimated the shear capacity of the horizontal joint. In addition, the Chinese Specification failed to consider the influence of the shear-span ratio.

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