Advanced Materials Research Vols. 594-597

Abstract: The point-supported cable truss curtain wall is widely applied in today's high-rise construction structural design. The wind load is the main loads which are bore by Point supported glass curtain wall structure. When the curtain wall glass panels are subject to wind load, the panel will transform form surface loads to point load by spider claws passed to the supporting structure. This paper adopts the method of time domain and ANSYS software to analyse point-supported glass curtain wall cable truss structure of wind-induced vibration response.

Abstract: As the capacity of strong wind-resistant of the transmission tower for long running time is relative weak, the accident of tower collapses frequently occurred is a serious threat to the safe operation of the transmission line. Firstly the check and calculation of wind-resistant of the transmission tower were did, then the paper built the finite element model of the transmission tower to study the weak location with ANSYS software based on the practical engineering accident of PingzhaⅠdual loop transmission lines. Gusset plate model was created, through numerical analysis, the strengthening method was proposed for the capacity of wind-resistant of the transmission tower. This paper is of referring value for the bearing capacity increment of the same type transmission tower in coastal areas of multiple strong winds.

Abstract: As the key component, the aggregates have a significant impact on the concrete’s mechanical properties and fracture modes. To study the impact of aggregates distribution on concrete failure, the extended finite element method (XFEM) is adopted to simulate the mesostructure failure process by virtue of random aggregate model under uniaxial tension. The result shows that aggregates distribution has little effect on the concrete mechanical properties, but aggregates distribution effect fracture modes.

Abstract: Wharf on piles is a main structure in costal engineering. Working in severe ocean circumstance, the security of wharfs is important. Recent years, the inspection and appraisal method of wharf on piles is highly regarded. Because wharf is a complex system, there are still many difficulties in scientific appraising the technical status of the wharf. This paper systematically states the main procedure or of inspection and appraisal of wharf on piles. Concerned that the wharf is still working while inspecting, some non-destructive testing method is applied in the procedure. In addition the paper points out some key factors that can spoil wharf structure based on inspection result.

Abstract: The finite element methodology is conceived to obtain the mechanical parameters about dynamic performance of multilayer A-type U-shaped corrugated structure materials under the in-plane crushing loadings with various impact velocities. A simplified energy absorption model is proposed to evaluate the energy-absorption performance. The evaluation model shows that the optimal energy absorption per unit volume is mainly determined by the dynamic plateau stress. The homogeneous deformation mode, transition deformation mode and dynamic deformation mode are gradually observed with the increasing impact velocities. These three different deformation modes are presented in detail. The in-plane dynamic plateau stress depends on the impact velocity for the multilayer A-type U-shaped corrugated structure materials with a given fixed cell wall thickness. From the physical analysis and discussion of the numerical results, the empirical formula of dynamic plateau stress is suggested in terms of impact velocity.

Abstract: This paper discribes the problem of cast-in-situ concrete hollow slab with tube fillers allocated by single-way, according to the arrangement principle of tube fillers in the cast-in-situ concrete two-way hollow slab with two-way fillers, using nonlinear finite element analysis method, through the research on mechanical behavior influence of the hollow ratio to hollow slab, and gives the corresponding design recommendations. Lastly, this paper summarizes the layout method of tube fillers and reasonable requst of the hollow ratio for guiding design.

Abstract: To study the debonding of concrete filled steel tube (CFST), pulling and bending methods were used to test the normal bond strength. Based on the test result, debonding due to temperature change and shrinkage of core concrete in CFST was analyzed. The test and analysis result shows that the bending method is a better test method; the concrete strength has little influence on bond strength while the surface condition of steel has much influence on it. The bond strength of steel which is rust is greater than that of the steel with smooth surface. According to the analysis on the bending test result, the normal bond strength of 0.86MPa was got and the debonding of CFST arch was analyzed, the analysis result shows that debonding will easily happen under the action of temperature change and shrinkage of core concrete. The test methods and results can provide a reference for engineering applications.

Abstract: Steel structure, which has higher bearing capacity, smaller sectional dimension, convenient construction and economical investment, can be abroad used in engineering. However, due to a lot of reasons, the gradual expansion and convergence of the micro-defects lead to the macro deterioration of the mechanical properties of materials. By experimental research, theoretical analysis and computer simulation, the mechanical properties of the corroded steel beams strengthened with (prestressed) CFRP sheets were studied. According to the mechanical characteristics of corrosive steel beams and corrosive composite steel-concrete beams strengthened with prestressed CFRP sheets. By using ABAQUS finite element program, the calculation model of prestressed CFRP sheets strengthened corrosion steel beams and corrosion steel-concrete composite beams is established, and the working mechanism is studied. The calculation results show that: the bearing capacity of strengthened beams increase with the increasing of the initial prestress and CFRP sheets thickness, and decrease with the increase of steel corrosion degrees.

Abstract: In order to determine the fiber direction distribution statistical characteristic of short fiber reinforced concrete, this paper put forward the equal projection model. According to the isotropic assumption of large volume of short-fiber reinforced concrete, in the three-dimensional coordinate system, when the concrete loads along all coordinate axes are equal, it is believed that a representative short fiber projection components in all axes are equal. According to the deduction, the cosine of the angle of the representative fiber and the force direction is equal to the reciprocal value of the square root of 3. On this basis, as an application example, the formula for the prediction of fiber reinforced concrete elastic modulus was deduced. The formula shows that the elastic modulus of short fiber reinforced concrete is equal to the sum of 1/3 of the elastic modulus of long fiber concrete in fiber length direction and 2/3 of the elastic modulus of long fiber concrete in the vertical direction.

Abstract: The fractional dynamics equation of a viscoelastic two-member truss system, in which fractional derivative model introduced to simulate the materials’ characteristics, is proposed. The equilibrium paths under vertical loads, horizontal loads and combined loads are discussed respectively. The results show that: there are primary and secondary equilibrium paths under vertical and horizontal loads. Bifurcations will occur under combined loads and the ultimate bearing capacity of the system will reduce. The equilibrium paths became complex because of the horizontal disturbance, and the bigger of the horizontal disturbance the smaller of the system ultimate bearing capacity.