China IPPR International Engineering Corporation

Beijing, China

China IPPR International Engineering Corporation

Beijing, China
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Zhou Z.,China Earthquake Administration | Cao W.,Beijing University of Technology | Zhang Y.,China IPPR International Engineering Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2016

Four full-scale L-shaped recycled concrete low-rise shear wall specimens were tested under low-cycle repeated loading to study the influences of thermal insulation blocks of expandable polystyrene (EPS), recycled concrete strength and reinforcement ratio. The four specimens, among which three were prepared with thermal insulation blocks of EPS and one was prepared without EPS blocks, were made of recycled concrete. Seismic performance including load-bearing capacity, stiffness, ductility, energy dissipation capacity and damage evolution law of those specimens were investigated and compared. Results show that load-bearing capacity and elastic-plastic deformation capacity of the shear walls can be improved significantly by increasing concrete strength and reinforcement ratio. The low-rise shear walls with thermal insulation blocks of EPS have better seismic performance compared to the wall without thermal insulation blocks. © 2016, Editorial Office of China Civil Engineering Journal. All right reserved.


Jian X.,China National Machinery Industry Corporation | Tong-Yi Z.,China IPPR International Engineering Co. | Wei H.,China IPPR International Engineering Co. | Ming-yi H.,China IPPR International Engineering Co.
Evolving Systems | Year: 2017

Sensors deployment has played an important role in many engineering applications, and the key goal is aimed at achieving an optimal surveillance region with a set of sensors. In this paper, a probabilistic strategy was chosen as the sensing model and a Gaussian probability distribution was employed, furthermore an accumulative probability for all the utilized sensors was presented and an optimal deployment on meshed planar grid was proposed. It was proved that the deployment problem was NP-complete, and an approach for approximating this solution should be resorted to intelligent methods. Particle swarm optimization (PSO) was a widely used artificial intelligent tool, and hereby an improved discrete PSO (DPSO) was proposed for solving the deployment problem, and which was based on integer coding, and the initialization, positions and velocities updating were distinct with the traditional PSO. In final, the deployment was investigated respectively by using uniform sensors (binary coding problem) and combinational sensors (multivariate integer coding problem), which were indicated to the core structure of proposed DPSO. © 2017, Springer-Verlag Berlin Heidelberg.


Liu Z.,China IPPR International Engineering Corporation
Applied Mechanics and Materials | Year: 2012

With the development of Inner Mongolia urban construction, green building is becoming an increasingly hot word in architectural circle. This paper is based on the reality of Inner Mongolia and refers to experience both domestic and international, analyzing the strategies for promotion and construction of green buildings in Inner Mongolia. © (2012) Trans Tech Publications.


Li N.,Tsinghua University | Li N.,China IPPR International Engineering Co. | Qian J.,Tsinghua University | Ye L.,Tsinghua University | Liu S.,Inner Mongolia Mengxi Engineering Design Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

Quasi-static tests of four precast concrete shear wall specimens with shear span ratio of 2.11 were conducted. The vertical rebar of the precast shear wall was spliced by pressed sleeves. Among them, three shear walls had a rectangular section and the axial load ratios were 0.5, 0.6 and 0.2 respectively. One shear wall had a T section and an axial load ratio 0.5. The test results indicate that the shear wall specimens fail in compression and flexure interaction. The vertical rebars at boundary elements yield in tension and concrete at the edge of wall bottom crush in compression. The lateral force-displacement hysteretic loops have a degree of pinch. The ultimate rotation angles of the shear walls with rectangular section and T section, where the flange is in compression, are not less than 1/80. The ultimate rotation angle of shear wall with T section, where the web is in compression, is 1/110. The ratio of the measured compression-flexure strength to the calculated strength according to the formula of GB 50010-2010 is about 1.20 for the shear walls with rectangular section. The ratios become 1.04 and 1.11 for walls with T section, where the flange and web are in compression respectively. The pressed sleeve connector can transfer the tensile and compressive forces of rebar effectively. The seismic behavior of the precast shear wall with the vertical rebar splicing by pressed sleeve satisfies the current code requirements. © 2016, Science Press. All right reserved.


Shi L.Y.,China IPPR International Engineering Corporation | Li Z.B.,Beijing University of Technology | Zhang Z.Y.,China Academy of Launch Vehicle Technology
Advanced Materials Research | Year: 2012

The paper researched on the strain, the deformation and the failure mode of hollow latticed steel columns through two experimental conditions. They were respectively about the vertical load and the horizontal load. The results showed that for the hollow latticed steel columns with upper columns, because of the stiffness of upper columns was obviously higher than the lower ones', the upper columns were destroyed earliest under the vertical load. In addition, the columns had good horizontal bearing and deformation capacity, and the gravity second-order effects were not obvious for the columns. © (2012) Trans Tech Publications, Switzerland.


Zhai X.-M.,Harbin Institute of Technology | Huang M.,China IPPR International Engineering Corporation Ltd
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

Dynamic finite element software ANSYS/LS-DYNA was used to set up a typical finite element model for a Kiewitt8 single-layer reticulated shell containing reticulated shell member, purlin hanger, purlin, rivet, roof boarding, wall and ground. The dynamic response of the structure subjected to internal eccentric blast loading was studied by using ALE (Arbitrary-Lagrange-Euler) algorithm. Four response types were defined, they were: no impairment, member plastically developing, large deformation of reticulated shell and destruction with explosion relief. The response rules of the structure under internal eccentric blast loading with variation of explosion point position, section size of reticulated shell member, rise-span ratio, supporting condition and thickness of roof boarding were obtained through comparisons of plastic strains, plastic development levels and displacements of the structure. The results provided a theoretical basis for reasonable defense and anti-blasting design of reticulated shell structures.


Zhai X.,Harbin Institute of Technology | Huang M.,China IPPR International Engineering Corporation
Journal of Earthquake Engineering and Engineering Vibration | Year: 2012

Finite element software ANSYS/LS-DYNA is used to establish a refined kiewitt8 single-layer reticulated shell finite element model,which contains reticulated shell member, purlin hanger, purlin, rivet and roof boarding to simulate the dynamic responses of a structure subjected to external blast loading by using ALE (Arbitrary-Lagrange-Euler) algorithm. The strain rate effect of materials and the inter-collision of the components are considered. The responses of the structure under external eccentric blast loading with varied TNT equivalent weights, explosion point position, section size of reticulated shell bar, rise-span ratio, supporting condition, thickness of roof boarding, roof boarding load and the form of roof boarding are obtained by the comparison of the plastic strain, the plastic development degree and the displacement of the structure, which could provide a reference for reasonable defense design of reticulated shell structure to resisting blast. The results show that with the changes of each parameter, there are four damage modes of kiewitt8 single-layer reticulated shell under external blast loading, that is intact, local deformation local damage and total collapse.


Zhai X.,Harbin Institute of Technology | Huang M.,China IPPR International Engineering Corporation
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2013

To know the function of protective measures for reticulated shell subjected to internal blast loading, a fine finite element model for Kiewitt8 single-layer reticulated shell which contained reticulated shell member, purlin hanger, purlin, rivet, roof boarding, wall and ground was established by using finite element software ANSYS/LS-DYNA. The effect of reinforcement for reticulated shell member, selection of roof boarding and openings in the wall was studied by using ALE (Arbitrary-Lagrange-Euler) algorithm. The results showed that by selecting the outer-loop members to reinforce, choosing light roof boarding or thin roof boarding, increasing the opening rates and the height of position, and reducing the opening spacing, the dynamic response of the reticulated shell under internal blast loading could be reduced effectively.


Ke X.-J.,Xi'an University of Architecture and Technology | Ke X.-J.,Guangxi University | Chen Z.-P.,Guangxi University | Xue J.-Y.,Xi'an University of Architecture and Technology | Ma F.-B.,China IPPR International Engineering Corporation
Gongcheng Lixue/Engineering Mechanics | Year: 2013

In order to reveal the bond-slip behaviour between steel and concrete in SRC special-shaped columns under dynamic actions, 17 specimens were designed for experimental research. By the strain gauges and slip sensors embedded on the steel flange surface, the bond stress distribution along column, loading-slip hysteretic curves and skeleton curves were obtained. The influence of loading reversed times on bond stress was analyzed, calculation formula for bond degeneration was presented, and bond-slip constitutive relation in various places was established. Research results show that bond stress and slip are respectively distributed in parabola and exponential curve along columns. The maximum bond stress occurs in the upper, middle and lower of column, so these positions are vulnerable to bond failure. With the increasing of loading reversed time, bond stress decreased while slip increases gradually, indicating the occurring of bond degeneration. At the beginning of loading, loading-slip hysteretic curve is chubbiness, but it gradually becomes Z-shaped and pinched by the increasing of loading. The whole bond-slip failure can be divided into non-slip stage, elastic stage, elastic-plastic stage and plastic stage.


Cao W.,China National Petroleum Corporation | Chen X.,China IPPR International Engineering Co.
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2016

In the theory of Mononobe and Okabe, the distribution of unit seismic earth pressure is linear and the location of application point of total seismic earth pressure is at H/3 from the base of retaining wall, which is different from test results. Based on the assumption of planar sliding surface in Coulomb's earth pressure theory and the moment equilibrium of sliding soil behind retaining wall, the seismic amplification factor is introduced, the method determining the application point of total seismic earth pressure is presented, the effective formula of unit seismic earth pressure is proposed and the effects of seismic amplification factor on seismic earth pressure and its distribution are analyzed. The results show that the total seismic earth pressure without seismic amplification factor is identical with those from Mononobe theory, which indicates that the latter is a special case of the proposed method; the location of application point of total seismic earth pressure is at 0.40H∼0.50H from the base of retaining wall, which is identical with Sherif's experiments and proves that the proposed method is a further supplement of Mononobe's theory; the distribution of unit seismic earth pressure along the wall is non-linear and approaches to a parabola, and the maximum value is not at the base, which shall be paid attention during the stability design of retaining wall. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

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