Advanced Materials Research Vols. 919-921

Abstract: With a 6 layer of concrete-filled steel tubular column-steel beam frame structure as the object of study,established finite element model of the structure is based on Sap2000,the traditional structure model and the isolation structure model were compared.The research results show that the dynamic characteristics of structure storey drifts and acceleration with Lead Rubber Bearing are smaller than the model without Lead rubber bearing under different earthquake intensities. The isolation effect is considered obvious.

Abstract: The integral hoisting construction technology of large steel truss has been widely used in the steel structure construction. Based on the principle of strain energy, the feasibility analysis on lifting point optimization of Wuhan public house’s large steel truss was conducted. It expounded the integral lifting construction technology of Wuhan public house’s large steel truss. Through the 12 different methods of lifting point setting and the application of finite element analysis software SAP2000, it discussed the optimization method of hoisting points of large steel truss on the principle of minimum potential energy. It achieved the change rule of the whole strain energy of steel truss. The scheme of 10 lifting points was identified on the economy and construction conditions. The stress state, the structural deformation state and the steady mode was analyzed under the optimum lifting point condition. The results meet the design and construction requirements, and this research method can provide the certain reference value for similar engineering.

Abstract: According to the design and construction characteristics of steel box concrete girder of a large landscape tower, C40 grade non shrinkage self-compacting concrete meeting engineering requirements was produced. The fresh concrete workability, early age shrinkage are researched, construction technology and detection methods are discussed combined with the practical engineering of steel box concrete girder.

Abstract: The Suspended Latticed Intersected Cylindrical Shell (SLICS) is a new structural system, composed by the single layer Latticed Intersected Cylindrical Shell (LICS) and the prestressed cable-strut system. Mechanical properties of this structure were investigated through nonlinear buckling analysis by the consistent imperfect buckling analysis method, compared with the single layer LICS. Structure parameters including prestress level, member section, length of bar, rise-span ratio, obliquity were analyzed. And the effect of material nonlinearity on the stability was studied. Results show that the ultimate bearing capacity of the SLICS is improved as the introduction of prestress. However the prestress level has a limited impact on the ultimate bearing capacity. And the material nonlinear is very important to the stability of the SLICS.

Abstract: In this paper, the ultimate strength of open box girders with pure torque, bending moment and combined loads are investigated using a commercial FEA program, ABAQUS. It studies the ultimate strength bending moment of Nishihara open box girders model. This paper mainly analyzes the influence of the ultimate bending moment on the open box girders by the finite element mesh, bounding conditions of the open box girders and the initial deflection.

Abstract: Cold-formed lipped channel sections may fail in local, distortional and overall buckling under compression. With the development of computer technology, finite element analyses of these sections play increasing important roles in engineering practice for economic design and time-saving purpose. A kind of typical cold-formed lipped channel beam-column with varying load eccentricity was analyzed in this paper by using the finite element program of ANSYS to observe the buckling modes and load carrying capacities of the columns. All the results can be the reference for further studies.

Abstract: The research showed focus on the performance comparison between two equivalent frame structure. i.e. the first one made by steel and the second one by all frp (fibre reinforced polymer ) pultruded material. The structure adopted for the analysis is a traditional two floors frame made by connections between columns and beams. The connection has been assumed rigid to simplify the comparison, already very hard and to point out on the overall structural answer of the two different cases. The reason why of the investigation is related to teh need to deep detail the eventually structural benefits in presence of FRP material. However the success is related to a very reduced weight of FRP material (with weight equal to 1600-1800 kg/m3) linked to a not negligible performance in term of strength and durability, even if also the easy employment play a very important rule. The two storeys frame were subjected to static and dynamic actions to analyse also in comparison the response

Abstract: Parametric sensitivity to static behavior and dynamic characteristics of Long-span Arch-truss String Structures (ATSS), which is based on statistical distribution of parameter errors including elastic modulus of the material, effective area and pre-stress of cable, and thickness of steel pipe, etc., was studied by Monte Carlo simulation method of ANSYS. The error of sectional area of cable is found to be the most sensitive parameter and the natural frequencies are greatly sensitive to the errors of modulus of members. The results help to determine suitable updating parameters of ATSS, and provide valuable advices to guide the construction control.

Abstract: During the past two centuries, steel structure has become one of the most popular structural system. How to balance the construction cost, structural properties and other factors is an important aspect needed to be addressed. This paper describes the whole process of performance based optimized design of steel structure. First, the methods on the shape and sizing optimization, cost and others are introduced. Then, the multi-object optimization of steel structure is presented, in which the main aspects of the optimizations are studied. Finally, the design principle and the analytical steps for the multi-object optimization of steel structures are discussed. This paper can be references for the optimization design of steel structures.

Abstract: The failure mode of the corroded RC beam may shift from designed failure mode to others failure mode, as the load resisting mechanism changes due to the corrosion ratio of rebars. In this study, the load resisting mechanism and the failure mode of the corroded RC beam were investigated based on the bond performance. If the corroded RC beam is non-uniformly corroded, the beam suffers beam action and fails in flexural failure. Otherwise, the load resisting mechanism and the failure mode depend on the corrosion ratio of bottom portion stirrups. Moreover, the decision point is proposed to predict the load resisting mechanisms in the corroded RC beam.