Applied Mechanics and Materials Vols. 405-408

Abstract: The paper presents an in-deep reliability study on concrete filled FRP tube columns using four well-known design codes which include the ACI 4402R-08, the CNR-DT200, UK code (TR55) , and the Chinese code. Monte Carlo method is utilized to calculate the reliability index of the column. The simulation results reveal that the reliability index depends heavily on the design code and the ACI 4402R-08 design code is found to be the most reliable one for the design of concrete filled FRP tube columns. The variation of the unconfined concrete strength has remarkable influences on the reliability of the column while the variation of the FRP tensile strength can hardly affect the reliability. Consequently, it is concluded that the partial safety factor for concrete or the FRP proposed in existing design codes may be suitably enhanced in order to make up the reliability loss due to the increment of the variation of concrete.

Abstract: Composite foam sandwich tube, which is a sandwich structure, improves stability of the tube and strength for use compared with single-layer composite, and is available in civil engineering as bearing member of light weight, high strength, and corrosion resistance. Axial compression experiment was made for fiber reinforced resin matrix composite foam sandwich tube which is laid in 5 different ways, and the comparing analysis on damage models was made according to experimental phenomenon. The laws of influence is preliminarily recognized by analyzing influence to foam sandwich tube of fiber laying, modulus of fiber, three dimensional elastic modulus ratio, tube radius, tube thickness.

Abstract: Protection wall system is the key to promote the development of steel structure building to standardization and industrialization. On the market,there are many different kinds of wall materials, but some do not apply to steel structure buildings. In this part, it is discussed the adaptability of wall-board in steel structure, and introduce several common interior wall-board of the classification and application in practical engineering.

Abstract: The underground water seepage is always the key and difficult point in waterproof engineering. Aiming at the characteristics of underground engineering waterproof, this paper describes how to make use of Rayleigh wave detection technology to detect leakage in underground works, and find disease location through the analysis of the dispersion curve, and then combine Rayleigh wave detection technology with polymer grouting technique grouting on the disengaging position, to achieve the effect of waterproof plugging. Research results show that through combining Rayleigh wave detection technique and the combination of polymer grouting technology, it is quicker and more convenient to manage underground leakage defects, which satisfies the project need and has wide application value and social benefits.

Abstract: t is concluded the influence law of forming final value compared with design value by using one and multi-stages molding to analysis three kinds of different structure. It is shown that the hybrid structure system of concrete structure and steel structure can coordinate both force performance and make it is more consistent with design value.

Abstract: In this paper, a set of the procedures of the numerical simulation for the buried pipeline is proposed. These numerical procedures are used to compute the large deformations of the buried pipeline through the fault. In order to simulate the fault slip, displacement control is adopted. The geometric and material nonlinearity of buried pipe are considered. The beam elements are used to calculate the buckling deformation of the pipe. The ASCE (1984) soil spring models (SSM) are used to model the interaction of deformation of the soil and the buried pipe. In order to confirm rationality of numerical results using SSM, comparison between experiment result in Cornell University (CU) [5], Trautmann and ORourke experiment results [7] and SSM numerical results are studied. Two examples demonstrate the accuracy of the proposed procedures.

Abstract: tower consisted of steel tubes and angel steels has equal advantages which steel tube tower has and not easy to happen some bar breeze vibration,but but the wind vibration response for such transmission tower structure research is less. In the engineering background of a tower consisted of steel tubes and angel steels , set up the finite element model for transmission towers. Using Kaimal spectrum for numerical simulation of wind velocity time history. Of 90 ° Angle of wind direction wind to dynamic response are analyzed, the results show that for the displacement, the maximum of dynamic analysis results 88% larger than the result of the average wind, 53.7% larger than standard wind load static result; For axial force, the maximum of dynamic analysis results 147% larger than average the result of the wind, 108% larger than standard wind load static result. So in view of the transmission tower structure dynamic response analysis should be more precise.

Abstract: Wall-beam is widely applied to civil engineering structure. By using of the finite element method, the nonlinear finite element analysis is taken on to get the force transfer mechanism of wall-beam, strain distribution of wall-beam and prestressed wall-beam is compared. The study on strain distribution of different depth-span ratio is carried on. The conclusion in the paper is the academic support for crack resistance of wall-beam.

Abstract: Cracking is a common problem existing in highway bridge abutments. Combing with projects, cracking reasons of one oblique U-type gravity abutment are analyzed by using a large and commonly used finite element software-FEM in this paper; in addition, preventive methods are put forward which can act as references for designing and constructions.

Abstract: Build up a group of light-weight portal frame models with different slopes by SAP2000 software. Conduct dynamic time-history analysis on light-weight portal frame models with different slopes under the EI Centro wave. The results show that: The maximum positive and negative displacement and acceleration of the light-weight portal frame presents a variation rule as the the slope increasing; the influence of the slope on the maximum positive and negative displacement of the frame is relatively small, while it is big on the maximum positive and negative acceleration; the acceleration amplification coefficient of the frame decreases as the slope increasing when the slope exceeds a limit, which show that the earthquake damage of the large slope light-weight portal frame increases as the slope increasing.