Advanced Materials Research Vols. 1065-1069

Abstract: It is major, simple structure and wide scope of use on Gravity abutment of plain concrete, But most of the wall of abutment appears irregular cracks, affect the economy and durability of the abutment and bridge seriously. The paper is based on a bridge of Jiang Xi Rui Xun high-speed engineering, analysis the crack mechanism of abutment by using large-scale finite element software ANSYS to establish reinforcement simulation model of top and bottom ring beam. The stress and vertical deflection of the abutment are meet the requirements, it is meaningful for gravity abutment of plain concrete Strengthening in the future.

Abstract: As an improvement form of deep foundation, belled steel’s engineering research and application has matured. On the basis of belled steel pile, a new form of steel piles, explosive expansion steel piles, is proposed. Based on ABAQUS, the two-dimensional axisymmetric finite element contact model of pile and soil is set up. The parameters include: the diameter of the expanding section and highness of the expanding section have been analyzed through the Q-S curve. The results show that: the vertical bearing capacity increases significantly with the increase of the diameter of the expanding section, but decreases with the increase of the highness of the expanding section

Abstract: The failure criteria and calculating methods of static and seismic shear strength of masonry under combined shear-compression action have been researched in this paper. According to the least energy consumption principle and the failure criteria of orthogonal anisotropic materials, the correlated formulae of masonry under combined shear-compression action are established. The correlated formulae are in good agreement with experimental results. On this basis, the calculation formulae of the static and seismic shear strength are established. The calculation formulae uniformly use the axial compression ratio as main variable to express. By analyzing examples, it shows that calculations by formulae given in this paper are in accordance with values of "Code for design of masonry structures" (GB 50003-2011) and "Code for seismic design of buildings" (GB 50011-2010). The methods in this paper may provide important references to engineering design as well as code revision.

Abstract: In case a fire occurs in a steel structure building, materials properties and mechanical properties have undergone great changes, especially bending beam, its force complex than other members, charged with an important role in the structure, when the fire broke out the other members also prone to failure. This article refer to the document [1], the deflection change of bending steel beams subjected to fire are studied, analyzed its variation trend with the fire temperature, the accurate judgement of the stress state on the fire burning at different time can make the stress analysis more accurate and reasonable.

Abstract: A review on the properties of recycled aggregate concrete filled steel tubes (RACSFT) was presented, followed by the short overview on the related researches. The uniaxial mechanical behavior, flexural performance, creep performance as well as eccentric loaded behavior of RACSFT specimens were discussed. It was found that the differences between the element made of recycled aggregate concrete (RAC) and that of natural aggregate concrete (NAC) could not be ignored. The performance of the RACFST is inferior to that of natural concrete filled steel tube (CFST). But, the RACSFT can be applied into structural elements safely. Based on the test results, it was also concluded that the RACSFT is an effective method to improve the application of RAC.

Abstract: This paper presents the results of static tests of non-reinforced round timber bolted joints with slotted-in steel plates loaded perpendicular to the grain. This type of joints loading is particularly widespread in truss structures. Round timber test samples series were prepared to validate the behavior of a joint loaded in tension perpendicular to the grain. The joints samples were experimentally tested in the laboratory of the Faculty of Civil Engineering VŠB TU Ostrava. The test results were compared with the calculated load-carrying capacity of joints by Johansen’s yielding theory.

Abstract: The fire resistance ability of load-bearing column of building structure under fire is an important aspect affecting the safety of the structure. Although a large number of research results have been achieved in this respect, the researches on the numerical analysis of the bearing capacity and deformation process at high temperature are still not sufficient. The numerical simulation of the bearing capacity and deformation process at high temperature is hard to carry out and complex to operate, and not practical as well. Therefore, simplified analysis method is adopted to analyze the deformation and internal force of the controlling section of the load-bearing column subjected to fire. Besides, taking the concrete filled circular steel tubular column as example, the basic analysis theory of the fire resistance and the deformation performance of columns subjected to constant load is presented. The numerical calculation program which is developed on the basis of this theory can well simulate the process of deformation and the fire resistance of the columns subjected to fire. The simulation results are in good agreement with the experimental results.

Abstract: At present, many analysis methods and calculation formulas of the bearing capacity of concrete filled steel tubular columns have been researched. But these numerous calculation formulas of the bearing capacity have varied forms, and the application scope and the calculation precision of them are also quite different, which makes it difficult and confused for engineering designer to choose a suitable formula. Primary calculation formulas of the bearing capacity of concrete filled steel tubular columns are summarized. The calculation results of these formulas are compared with some test results of the concrete filled steel tubular columns with a large diameter. The applicability and the accuracy of these formulas are analyzed. Based on these comparisons and analyses, reasonable suggestion is given to select the suitable formula. Finally, one formula is provided to calculate the ultimate bearing capacity of concrete filled steel tubular columns reinforced with steel bars.

Abstract: Concrete filled double skins steel tube is a new components which is based on concrete filled steel tubular and use inner steel tube instead of core concrete. The components have many advantages such as little weight, good resistance for earthquake, good stiffness for resist bending and good performance for resist fire, and has been used in bridge pier, high-rise buildings, power transmission tower and so on. While these structures may inevitably suffer impact which comes from vehicles, ships, aircraft, etc. the structures which is impacted have taken much attention. This article will analysis dynamic behavior of concrete filled double steel tube under impact with simply supported, and propose formula of dynamic bearing capacity, laid the foundation for the analysis of impact performance of CFDST.

Abstract: In order to improve the traditional concrete filled steel tube's corrosion problems,when it uses as holding column of offshore platforms and as support bar of long-span bridges,this paper mainly studies stainless steel-concrete-carbon steel circular concrete-filled double skin steel tubes's flexural behaviour. Six specimen's tests were carried out.The main parameters varied in the test were the hollow ratio (χ) was 0.45 or 0.69,and shear span ratio (λ) was 1 or 3.The experiment results show how the hollow ratio and shear span ratio effect specimens' ultimate flexural capacity.Also,the experiment results provide experimental basis for structure design.