The Third Engineering Scientific Research Institute of the Headquarters of the General Staff

Luoyang, China

The Third Engineering Scientific Research Institute of the Headquarters of the General Staff

Luoyang, China
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Wu J.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

Aiming at effective resistance to structures damage under blast waves, a newly-designed steel-concrete composite structure was put forward. Energy absorption by deformation and the deformation degrees of composite structure were analyzed. Based on analytical method of resisting force of one way slab under uniform loading, calculation formula of resisting force of composite structure was deduced. According to analytical method of dynamic response of one way slab under uniform impulse loading, the calculation formula of energy absorption by deformation and the deformation degrees were deduced based on large deformation of composite structure. The influence of explosive weight, wall's height and wall's thickness on deformation degrees of composite structure was also studied. The analysis indicates that deformation degree of composite structure increases as explosive weight and wall's height increase, wall's thickness and steel thickness decrease.


Gao C.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Zong Z.,Nanjing Southeast University | Wu J.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

In this paper, damage mechanisms, failure modes and progressive collapse mechanism of RC frame structures under blasting loading are studied and some parameters, such as explosion sites, distances and explosion equivalent are considered. Furthermore, nonlinear finite element (FE) dynamic analysis of the RC frame structures under blasting loads is conducted. Following conclusions can be drawn from the experiments and numerical simulation: (1) The damage under internal explosion is much greater than that caused by external explosion. Major damage emerged in the beams and columns under external explosion, whereas serious damage emerged in the joints of beam-column under internal explosion, besides failure in beam and column components. (2) After the internal explosion at the corner area of the RC frame structure, the risk of the progressive collapse of the RC frame structure increase if the corner column and its adjacent side columns fail at the same time. (3) The columns and the joints near the explosion position were seriously damaged after the internal explosion. Because many load transfer paths exist in the RC frame structure, partial collapse may incur the progressive collapse of the RC frame structure owing to the internal force redistribution. (4) Numerical simulation can well predict the dynamic disaster process of the RC frame structure under corner explosion. This method can provide reference for the further studies on the parameter analysis and the progressive collapse mode control of RC frame structures under blast loading.


Xia M.,Nanjing University of Science and Technology | Xia M.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Huang Z.-X.,Nanjing University of Science and Technology | Gu X.-H.,Nanjing University of Science and Technology | Zhang X.-F.,Nanjing University of Science and Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

The process of the shock-produced deformation of a thin-walled metal tube subjected to magnetic load caused by FCG (flux compression generator) in initial stage was analysed and decomposed into three phases: high current production, magnetic field formation and shock loading. On this basis, a theoretical model was established. Meanwhile, according to the theoretical model, associated simulation methods were applied to study the deformation characteristics by using the software MAXWELL and AUTODYN, and experimental verification was also carried out. The results show that all the theoretical, simulation and experimental results can coincide well, the deformation tendencies of the thin-walled metal tube caused by a pulsed magnetic dynamic load or an exploding load are both similar, and the distribution as well as the first peak time history of the pulsed magnetic dynamic load directly affect the final deformation of the metal tube.


Xia M.,Nanjing University of Science and Technology | Xia M.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Huang Z.-X.,Nanjing University of Science and Technology | Gu X.-H.,Nanjing University of Science and Technology | Wang Y.-Z.,Nanjing University of Science and Technology
Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics | Year: 2012

To study magnetic field of the high field magnet powered by flux compression generator (FCG), a theoretical model is established by analysis of loading process. According to this model, a comparative study on magnetic fields of six high field magnets with different structures is carried out, and the variation laws of the magnetic fields are also acquired. The results show that the parameters of FCG are the main factor in the initial stage, which cause small differences of peak strength and range of magnetic field between six magnets; but in the flux compression stage, the influence of the magnetic structure is more and more important with the variation of circuit process, and the peak strength and range of magnetic field for different magnets are changed significantly. Furthermore, the structure of magnet plays the decisive role in the spatial distribution of magnetic field, which is not affected by the loading process.


Guo J.,Wuhan Polytechnic University | Zha L.-Y.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Pang Y.-C.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Shen S.-S.,Wuhan Polytechnic University | Xia P.,Wuhan Polytechnic University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Deep excavation will cause ground settlement inevitably. The measured data of ground settlement are usually disturbed by construction and surrounding enviroment, and the validation is greatly affected because of the noise in the settlement data. Based on the large amount of data collected from deep excavations, a new model combining the wavelet analysis with the radial basis function (RBF) neural network is proposed to predict ground settlement. The wavelet analysis is used to denoise effectively the measured data, and the settlement curve close to the practical situation can be obtained and taken as the characteristic vector of the RBF neural input layer. A prediction model for the wavelet network (W-RBF) is formed to predict ground settlement based on rolling prediction. The results of case study show that the prediction performance of W-RBF model is significantly better than that by using raw data with noises. It has high prediction accuracy and is fit for modern information construction.


Wang W.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Liu R.-C.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Wu B.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff | Zhou C.-Y.,The Third Engineering Scientific Research Institute of the Headquarters of the General Staff
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

The blast waves parameters in venting area are important in damage assessment of building structures under internal blast. Once the blast waves parameters are certain, the damage level of structures and equipments near the venting area can be assessed. As internal blast wave is the superposition of multi-reflectied waves of initial blast by the inner surfaces of building structure, and the blast waves in venting area is not of the same character as free air blast waves, the traditional engineering arithmetic for blast waves parameters in venting area is not yet applicable. In the paper, based on dimensional analysis, the relationship between venting area blast wave parameters and different structure parameters was analyzed. Then the internal blast shock wave of building structure was simulated by using AUTODYN software. The evolutionary process of internal blast wave was investigated and the blast pressure wave profile in venting area was analyzed. Based on a large number of numerical simulations, the empirical equations for venting area shock waves parameters were summarized, and they can be used as the base of damage assessment of internal building blast. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

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