Advanced Materials Research Vols. 919-921

Abstract: In order to popularize the application of external prestressing technique in existing building green retrofits,this paper presents the compilation of nonlinear analysis program for externally prestressed beams based on both the geometrical nonlinearity type and the material nonlinearity type. Combined the static-load-experiment with 12 concrete beams prestressed with external tendons, the calculative results showed that this program matched relatively well with the experimental results.

Abstract: The concept of two-direction vector-valued wavelet packets is proposed. An approach for constructing orthogonal two-direction vector-valued wavelet packets is developed and their properties are discussed by means of time-frequency analysis method, algebra theory and functional analysis method. Orthogonality formulas concerning these two-direction vector-valued wavelet packets are established.

Abstract: The method of postulate of relatively intact model in the disturbed concept model is reached. Because it is more difficult to assume relatively intact curve by observed experimental data, a method which could automatically calculate the stress strain relation curve of relative intact by triaxial compression test data is raised, so that the determination of material parameters becomes easier, and the improved method is verified by numerical calculation. The results show that this method can effectively determine the stress strain relation curve of relative intact.

Abstract: As people spend more time indoors, indoor air quality becomes more and more important. Displacement ventilation, as a new type of air-conditioning strategy, has showed remarkable advantages on many occasions. In this paper, the air movement and particle distribution in a displacement ventilation room is studied and analyzed through CFD numerical simulation method. The results show that the airflow field and the temperature field all have obvious hierarchical structure, and the coarse particles have more obvious settling character.

Abstract: This paper describes the principle and analysis method of reservoir basin finite element calculation. Taking the forked river as an example, this paper illustrates the factors of high arch dam reservoir basin deformation and weight analysis methods through the finite element modeling calculation and analysis of the influence of high arch dam reservoir basin deformation and calculates the weights of impact factors of forked river reservoir basin deformation using the analytic hierarchy process method and then compare in order to gain the conclusion.

Abstract: Tuned liquid column damper (TLCD) is more advantageous in terms of space than TLD so that it is far more advantageous when it comes to installation on the actual building. To investigate the effectiveness of a tuned liquid column damper (TLCD) in mitigation wind-induced excitation motion of a tall building, aeroelastic experiments were conducted. A 1: 200 scaled model of an aeroelastic tall building was built, and TLCD models of mass ratio of 1.5% and 3%, respectively, were designed and tested with the aeroelastic model. As such, this study has installed TLCD with different lengths of horizontal pipes at the top most floor of realistic model. This is similar to the actual structure, centred on the interval where the vortex-induced vibration of low wind speed occurs, by conducting aeroelastic model tests in suburban areas and the vibration response in across-wind direction shall be found in order to figure out the wind vibration control effect according to various types (horizontal length, mass ratio) changes.

Abstract: Aimed at those accidents such as bridge collapsed, lifting containers fall off etc., based on slamming theory, combined with such practical engineering problems, simplified slamming model rationally, and carried out corresponding physical model experiment, thus obtained universal peak-pressure formula on this type slamming issues. Then take further research to validate the formula through others data, the results show that the formula has a good reference for actual engineering problems.

Abstract: This paper mainly gets a equation of crack width calculation. To get the result, the lineared bond-slip model between FRP bars and concrete is used, combining with the bond stress distribution model which is found by You Chunan. Finally, the value of this paper is compared with the value of ACI440.1R-06 and JSCE code, which prove the result is right.

Abstract: The purpose of the present study is to propose a design method for the normal section of carbon textile reinforced concrete (TRC) beam according to the Code for Design of Concrete Structures and failure modes. It has been suggested that the normal section may fail in case of fiber fracture in the lower portion of the beam, concrete crushing in the upper surface of the beam, or both. Beam is preferably designed to make full use of the compressive strength of concrete. Then we proposed the basic equations for the normal section of carbon TRC beam and their application conditions. At last, the proposed method is illustrated by a real example.

Abstract: Based on the structural characteristics of glass fiber laminates, a novel finite element numerical model of the laminates was proposed and established with ANSYS software. The results from the FE analysis are compared with available test data in the literature [1], which indicate the numerical model is reasonable and reliable. At same time, tensile behavior and shear behavior of the glass fiber laminates was analyzed. This study can provide reference for glass fiber laminates design and calculation, and has important practical value.