Cai Guojun

New Measurement Technology of Structural Silicone Sealant in Hidden Frame Supported Glass Curtain Wall Based on FFT Power Spectrum

The measurement based on FFT power spectrum of pulse transient dynamic response of structural silicone sealant damage in Hidden frame supported glass curtain wall was first proposed in the paper. The signal of four testing points was gathered and FFT Power Spectrum was used to analyze. Power spectral main peak frequency of the signal in contributing proportion of the total power (i ƒØ ) was taken as a dependent variable of the structural silicone sealant damage length ( a ). Experimental data were fitted to establish a functional relations between ¡¥ a ¡¦ and ¡¥ i ƒØ ¡¦byGaussian function or Lorentzian function, and the small damage value of ¡¥ a ¡¦was used to be detected. Research results show that it will be helpful for the application of the structural silicone sealant damage detection technology in the hidden frame supported glass curtain wall.

Application of Analytic Hierarchy Process in large span and shallow buried highway tunnel construction risk recognition

Recently there has been rapid development of large-span and shallow-buried highway tunnel construction and considerable risk appear, the urgent issues are that how to identify effectively risk factors which in the process of tunnel construction. With the review of disadvantages of risk recognition methods, the risk hierarchical structure for construction of the tunnel was established using the Analytic Hierarchy Process in a tunnel construction site, the synthesis weights of each basic risk event and weights of factors which cause these basic risk events were calculated. A risk recognition model of large-span and shallow-buried highway tunnel construction was established.

Axial response analysis of single pile based on SCPTU test

Analysis of single pile response is important for engineering design. Seismic cone penetration pore pressure (SCPTU) test can provide four parameters along the depth, i.e., cone tip resistance (qt), wall friction (fs), pore pressure (u2), shear wave velocity (Vs). Using the parameters due to SCPTU, pile axial load- displacement- pile capacity can be obtained effectively. Using the data of CPTU penetration test, pile base resistance and skin friction can be predicted. Moreover, by means of shear wave velocity, the initial stiffness of pile, vertical displacement and axial load transfer were evaluated. Finally, tests of PHC piles embedded in the interactive marine and terrestrial deposit soil and silty clay validate the accuracy of the proposed method.