Applied Mechanics and Materials Vols. 204-208

Abstract: The paper introduces 3 types of uniaxial stress-strain relationships of concrete filled steel tube by Pan Youguang, Susantha and Saenz, and performs finite element analyses of the axial strengths of 18 CTRC columns, studies the characters of three models, and comprises between the axial strengths from FEA and existed experiments. Results show these 3 types of model are all suitable for bearing analysis, but Pan’s model is more accurate.

Abstract: In the paper,the electrical discharge machining(EDM) technique was used to cut strips for cold-formed residual stress measurement of hat-shaped section.After adjusting the electrolyte ratio,designing specific the cutting tool and improving the methodof antiseptic treatment,the test results improved significantly. Electrical resistance strain gauges with EDM cutting technique were used to establish the magnitude and distribution of the residual stresses in cold-formed hat-shaped section.Based on the experimental findings, an idealized distribution pattern of the residual stress in cold-formed hat-shaped section is presented.

Abstract: The intensity calculating of simple joints is one of the most important thing in the design of space truss with hollow sections. By using the finite element method and close reference to material and geometrical nonlinear properties, numerical simulation analysis of the ultimate strength of K-type overlapped Rectangular Hollow Section joints under the axial force and bending moment was studied. The influence of the overlapped ratios and other geometrical parameters on the ultimate bearing capacity was investigated and explained graphically. With the thickness ratio of the chord bar and web member increasing, the ultimate capacity increased. And with the overlapped ratio increasing, the node capacity reduced.

Abstract: Stiffened plates are used in a wide variety of engineering structures. Based on the published experiments, two kinds of weld models were established in simulation and the influence of weld model on the response of stiffened plates under blast loading was analyzed. The results show that the deflections and failure modes of stiffened plates from simulation are in good agreement with those from experiments, and that the weld model has little influence on the deformation and the critical charge of the plates. A simple model can be used for analyzing the large stiffened structures under blast loading.

Abstract: Laced curved concrete-filled steel tubular (CCFST) member is an attractive proposition to be widely used in large-span space structures for economic and aesthetic purposes. A finite element model (FEM) was developed to perform an analysis on the full-range load versus deformation curves of laced CCFST members under axial compression to make it possible for proposing the further practical design.

Abstract: Parametric analysis of ultimate loading capacity is performed by the finite element method considering the dual non-linear effects for inner concave cable-arch structure with different arch rise-span ratio. The results show that for the inner concave cable-arch structure with other given conditions, the failure loads of the steel arch and the cable increase with the increase arch rise-span ratio, but the increasing ratios are different. The failure modes of inner concave cable-arch structure may be divided into three types: the steel arch failure, the overall failure and the cable failure. According to the considered parameters range in this paper, the steel arch failure mode may occur when the arch rise-span ratio is less than 0.3; the overall failure mode may occur when the arch rise-span ratio is between 0.3 to 0.35; and the cable failure mode may occur when the arch rise-span ratio is greater than 0.35. This provides some useful references for rational design of such structures.

Abstract: Based on the properties of lightweight aggregate concrete, the yield curvature and the ultimate curvature are calculated by numerical method, and the relationship between curvature ductility ratio and displacement ductility ratios is established for lightweight aggregate concrete shear wall. It is shown that the calculating results agree well with experimental results. The major influencing factors for ductility of lightweight aggregate concrete shear wall include with or without constrain edge conponent, the characteristic value of stirrup of constrain edge conponent, the axial compression ratio and the height-width ratio and so on.

Abstract: The paper centers on research, application and promotion of a new seismic isolation layer technology, whose study achievement includes reinforced-asphalt seismic isolation layer and reinforced-asphalt seismic level isolation pier. The experimental results show that the proposed technology shares excellent seismic isolation performance, and provides low-cost expenditure and simple construction method, which is most suitable to vast rural areas’ building in China, and it can also be implemented to the third world countries. The reinforced-asphalt isolation layer technology has been applied to engineering practice, which is the first building adapting the new technology. Meanwhile, experimental testing is carried out on it, which suggests a superior damping effect. The proposed level isolation pier technology simplifies utilization of civil buildings in rural areas.

Abstract: With the urban construction process speeding up, the problem of slope in foundition pit engineering has become a problem urgent need to be solved. Combined with the practical engineering,this paper used the combination of soil nailing with prestressed anchors in foundation pit support design，and found this method safe, reliable, economical and well effective.

Abstract: Through the axial compression experiment of 9 GFRP tubes reinforced concrete columns, this paper analyzes the failure mode and loading-strain curves under different pipe diameter, and compares bearing capacity between the experimental data with FRP reinforced concrete and the calculated value without GFRP tubes reinforced concrete. he results show that the bearing capacity and ductility of GFRP tubes reinforced concrete column have improved, because of the restriction effect of FRP tubes. The confining ability of FRP tubes on concrete reduced for a certain thickness GFRP tubes constraint concrete short column, while the pipe diameter is increasing.