Applied Mechanics and Materials Vols. 166-169

Abstract: Use of hollow material in deck plate can reduce slab weight and improve the performance of fixing and installing hollow material. In this study, one-directional slabs were experimented with presence or absence of hollow material and deck plate depth etc as variable to evaluate the bending performance of deck plate that includes rectangular cross-section polystyrene hollow material. As a result of the experiment, when compared with the deck plate without hollow material, deck plate with hollow material was found to have similar bending yield strength and deformation performance. In addition, hollow material deck plate was evaluated to have greater strength performance than bending strength provided in ACI318-08 standard.

Abstract: This paper presented an experimental study on piezoelectric impedance based elastic modulus monitoring for concrete during curing. The piezoceramic (PZT) patch was attached on the concrete specimen to collect the monitoring signal. The electro-mechanical impedance (EMI) spectra of surface bonded PZT patch were collected using an impedance analyzer by sweeping the frequency. A regression analysis is conducted to establish the empirical relationship between the relative elastic modulus of concrete and the monitored relative resonant frequency change of the EMI spectra. The established empirical formula is used for concrete elastic modulus monitoring via EMI spectra. The experimental results tell that the EMI technique is a practical and reliable nondestructive test method for concrete elastic modulus monitoring.

Abstract: To study the relationships between transferring and sharing of knowledge and quality management based on Juran’s theory of quality loop with the SECI model raised by Nonaka. Suggest that the deployment of knowledge transferring and sharing in quality management would continuously promote its performance. This paper introduces quality management process, the knowledge transfer and sharing mode. In enterprise quality management, realize the effective knowledge transfer and sharing, must also solve incentive mechanism, the quality tools and technical problems.

Abstract: In order to study the seismic behavior of steel frame structure, based on the verification of the finite element program, two different end-plate connections under monotonic load and cyclic load are analysed with the finite-element software ANSYS, considering geometry, material and status nonlinearity. Some parameters such as height of endplate, array of blot, diameter of blot are analysed to study their effects on the seismic behavior of beam-to-column end-plate connection, the bearing capacity of the joint of the framework, the initial rotation stiffness, the ultimate turning power, power-wasting capacity and ductility. The results show that reasonable connection have better power-wasting capacity and ductility , so it can be applicated in multiple-story steel frame structure.

Abstract: Hilbert-Huang transform (HHT) is a signal processing technique is relatively strong and effective today, to overcome the limitations of the used techniques have been widely used as traditional Fourier transform or Wavelet transform. Hilbert-Huang transform can handle effectively nonstationary and nonlinear signal. In this paper present how to use the HHT method to detect damage of the beams under the effect of moving load. Location damage is determined by observing changes in the first instantaneous frequency curve (IF1), damage location is the highest peak in the IF curve. This paper briefly described the theoretical basis and then applies through numerical simulation. These numerical simulations are simply supported beams damaged at different locations and with different levels of damage under the effect of the moving velocity case different. The results of numerical simulation shows relative accuracy compared with the theory and practice is assumed.

Abstract: A simple design office oriented empirical model containing only two parameters has been developed to predict creep behavior of concrete made of crushed clay bricks as coarse aggregate. For this, concrete samples having three different normal compressive strengths in the range of 18.9 up to 24.0 N/mm2 are first prepared and then tested for their creep deformation. For each of the samples, a hyperbolic equation is developed from their creep-time behavior. These equations are then combined and modified according to statistical norms to finally obtain a generalized equation. Comparison of creep strain obtained from this equation with that of experimental values show that the proposed model can closely predict creep in brick aggregate made concrete.

Abstract: With the extensive application of concrete-filled steel tubular structures, much attention has been paid to the detection of concrete density of the concrete-filled steel tube. Based on the advantages and research results of infrared thermography non-destructive testing, the paper established physical model and applied ANSYS finite element analysis module to numerical simulation of temperature field to make initial exploration on the applicability of such technology to the detection of concrete density of concrete-filled steel tube.

Abstract: BP neural network has some shorcomings,such as local extreme. Support vector machine is a novel statistical learning algorithm,which is based on the principle of structural risk minimization. In the paper, support vector machine is used to perform steel pip corrosion forecasting.The collected steel pip corrosion forecasting experimental data are given,among which corrosion deeps from 8ths to 11ths are used to test the proposed prediction model. BP neural network is applied to steel pip corrosion deep forecasting,which is used to compare with support vector machine to show the superiority of support vector machine in steel pip corrosion forecasting.The comparison of the prediction error of steel pip corrosion deep between support vector machine and BP neural network is given. It can be seen that the prediction ability for steel pip corrosion deep of support vector machine is better than that of BP neural network

Abstract: The raft foundation has been widely applied to tall building, in consideration of the stress state is complex and the stress mechanism is unclear, there are many unreasonable problems while determined the raft thickness at this stage. This paper used the finite element method and the interaction design method, on the basis of analysis of stress and deformation under the condition of different raft thickness, get the raft stress and deformation principle, provides a reference experiences to practical design.

Abstract: The article analyses the game process of various benefit corpus in the reformation process of urban village by establishing the game models, getting the combination forms of corpus and its strategies. Combining the three kinds of reformation forms of urban village ,such as reconstruction , adjustment and control ,and the especially actual circumstance of Hohhot ,the article puts forward the different reformation models to different villages.