Advanced Materials Research Vols. 374-377

Abstract: New structure of long straight walls with arched retaining wall was raised to improve the anti-sliding capacity of embankment soft ground. The arched walls embedded in the soft subsoil will transfer lateral forces in reasonable ways. Detailed research shows that the structure of arched walls can greatly increase slope stability and reliability.

Abstract: Promoted by modern material and construction technology, various ingenious structural forms are created with wide use of glued-laminated timber in large-span building. On the analysis of some classical cases for large-span timber structure, this paper expounds the design thoughts and technical features of employing structure as the main body of building space form and presents the idea of integrating large-span timber structural innovation with the spatial forms.

Abstract: In order to investigate the influence of the defective piles with stem shrinkage on the working behavior of pile foundations under vertical loadings, a numerical model was set up for the analysis of pile foundations. A series of contrastive analyses were made to a group piled foundations including a pile with defect of stem shrinkage in a shallow or a deeper depth and a pile foundation with normal piles with a three dimensional nonlinear finite-infinite element method. The basic working behavior of the pile foundation with a defective pile of stem shrinkage was initially revealed by the results of the analyses; and the basic rules of the affects of pile stem shrinkage defect on the distribution of axial forces among piles and the bending moments in pile caps were obtained. The results of this research are not only helpful for the understanding and rational judgment of the working mechanism, but also of practical importance in the assessment of the bearing behavior of pile foundations including defective piles with stem shrinkage and in the structural designs of piles and pile caps.

Abstract: Heterogeneous multi-core processors are attractive for power efficient green computing because of their ability to meet varied resource requirements. The multi-level memory hierarchy of Cell Broadband Engine Architecture (CBEA) which requires explicit management by software poses significant challenges to performance increasing and programming. In this paper, with analysis of characteristic of the architecture, we implemented four access methods and a corresponding access library with a uniform memory access interface. Besides getting performance boosts beyond current level technology, the memory access library with uniform access interface could collect profile information of memory management for further performance optimization. Experimental results show the performance of proposed method is better than related works and profile information provided by the method is helpful for programmer to optimize application performance.

Abstract: Based on the theory of risk analysis, this study develops a LHS –MC method to evaluate dam overtopping probability that accounts for the uncertainties arising from wind speed and peak flood. LHS method is used to generate samples of peak flow rate and wind speed especially for rare events. One example of dam overtopping risk analysis is presented to demonstrate the validity and capability of the proposed method. By means of numerical example, it is shown that LHS method is efficient which tends to convergence within a few simulation times. Reservoir routing, which incorporates operation rules, wind setup, and run-up, is used to evaluate dam overtopping probability.

Abstract: Zhaohua is a historic town of Sichuan province in china. On May 12th, 2008, a devastating earthquake measuring 8 on Richter scale struck Wenchuan in Sichuan province. 232 historic buildings in Zhaohua town, the number of totally damaged buildings was 46, the number of partially damaged buildings was 74, and the number of slightly damaged buildings was 112.The purpose of this research is to study the extent of damage to these historic buildings in this earthquake, and then attempt to evaluate the weak points in these historic buildings. Also this research will be beneficial to the reinforcement and prevention of historic buildings. As the result, the damaged situation of historic buildings is related to the building main materials and construction. Relatively buildings made of wood and brick with stood seismic forces more than buildings made of wood and mud, which collapse easily; the connection of the materials construction is the main weak point in the traditional historic building in Sichuan. Therefore, it is necessary to evaluate the weak points in historic buildings, particularly some historic buildings made of mud, which should been reinforced prior to an earthquake.

Abstract: In order to reject environmental factor effect from long-span bridge deflection signal, this document introduced the basic theory of independent component analysis (ICA) and applied FastICA algorithm to separate background engineering simulation signal, which was based on using vector-dimension-augmenting technique to process the signal after adopting fir lowpass filter to rejecte the high frequency component, and finally relized the separations of live load deflection, temperature difference deflection and long-term deflection. Campared separation results with deflection source signal, it was shown that the separation result was good when the correlation coefficients between separation signal and source signal were larger than 0.8.

Abstract: Geological factors and engineering factors is a major factor to damage, the drivepipe deformation under pressure seismic load which used to establish mathematical model of the mechanical model can calculated the stress and strain analysis of the casing. The drivepipe damage to this article on the mechanism research on the mechanical model of drivepipe analysis under Seismic load, based on the drivepipe through the focus on the impact and stress damage to the mechanical method of drivepipe deformation studies, and the models of a drivepipe failure mechanism of the mechanical and mathematical are established, which will scientifically, accurately predict the damaged drivepipe.

Abstract: Regional architecture research to the essence of the difference will be in control, so as to get to the bottom of its distinctive regional characteristics of the formation of the reasons. This is not blindly follow the mainstream of current research point of regional building, but seize the essence of architecture—space, from the perspective of the space to discuss and analyze the regional characteristics of architecture preliminarily, and explore new ways of regional architecture design.

Abstract: This research aims to study the temperature characteristic of porous cement concrete as an alternative pavement that can help to mitigate urban heat island effect, and all the benefits it can provide, along with several offspring. Three experiments conducted in this research focus on the effect of specimen thickness,moisture content and wind speed on the thermal conduction properties of porous cement concrete. Isostatic pressing method is adopted in the molding process of specimens and reserved holes method is utilized to measure the internal temperature of the specimens.The data presented in this paper explains the tend of thermal conduction properties accompanying the increase of specimen thickness,moisture content and wind speed.