Applied Mechanics and Materials Vols. 275-277

Abstract: Based on a project of a 22+55+22m continuous composite box beam bridge made of prestressed Concrete, using influence matrix, Numerical Simulation and Iterative Algorithm, an adjusting method for suspender force of continuous beam arch combination bridge has been proposed. It uses Finite Element Numerical Model to calculate the influence matrix and Iterative Algorithm to calculate the suspender force. When rely on this project, the error could be under 0.05% through finite iterative algorithm. And the feasibility has been tested in the completed bridge. It turns out that the error of the measured suspender force of the completed bridge is smaller than that in the design.

Abstract: To investigate the seismic performance of FRP strengthened RC hollow section bridge piers under multi-dimensional earthquake excitation, the pseudo-static test was carried out to RC rectangular hollow section as-built and CFRP confined bridge piers under constant axial compression force and bidirectional horizontal repeated load. The failure characteristics, lateral force-deformation curves and ductility of specimens were analyzed. The experimental result shows that CFRP constraining may change the failure mode of hollow section bridge piers, and significantly improve the deformation ductility, plastic deformation, however, it is less contribution to horizontal force of specimens with less wall-thickness.

Abstract: Though the introduction of light rail transit status and the reinforcement of prestressed track beams, this paper explored the carbonation mechanism of prestressed track beams, and analysised the main influencing factors of prestressed track beams. Based on concrete carbonation depth forecasting model, this paper analysised the carbonation law of of prestressed track beams in Chongqing, and proposed the durability design measures to prestressed track beams.

Abstract: Structure in horizontal wind load produce lateral displacement, vertical load may have caused additional effects due to the lateral displacement and deformation of the cumulative increase leads to structural instability collapse. Due to the characteristics and problems of the structure, utilizing SAP2OOO finite element software, this paper consider the deformation of the lateral displacement of the second-order effects under wind loads and loads of the Shanxi Taiyuan Xiaodian a tall steel frame structure.

Abstract: This paper analyses the stress state of sintered hollow block infilled insulation masonry under practical conditions. Based on the fact that the static loading performance of the new masonry block can be used in masonry structure, the comparative experiment research focused on the seismic performance between masonry works made of the new block and traditional sintered perforated brick with horizontal and vertical load working simultaneously, damage regulars and corrective measures are key points. Results show the mechanical performance of the new block masonry is worse than sintered perforated brick masonry in fragility and vertical loading capability. To get the same mechanical performance, the new block masonry should be improved in rib width, rib number and distance, especially in restraint by construction columns and ring beams.

Abstract: In this paper, the vibration equation of the structure-soil nonlinear interaction system was qualitatively analyzed by using the modern dynamic theory. Based on the multilinear kinematic hardening mode, the nonlinear finite element method was applied for the solution of the horizontal and torsional stiffness between the foundation and soil interaction system. And a mechanical model of the structure-soil nonlinear interaction system was established. The Lagrange energy method is used to build the coupling vibration equation of the structural horizontal displacement and torsion. The Primary resonance of the structure-soil nonlinear interaction system was studied by using the multiple scales method. By analyzing the nonlinear coupling interaction between different structures and soil, the coupling effect of structure system was revealed by appearing energy transfer from high order horizontal vibration to low order torsional vibration, and also the vibration characteristics and the behavior of energy transfer were obtained.

Abstract: Damage-induced local response is probably easy to be captured by the higher modes of the structures, especially for the small defects. The aim of this paper is to overcome the inherent deficiency of fractal dimension to identify crack when implemented to higher mode shapes. The proposed approach reconstructs the higher mode shape through rotation transformation, and then the fractal dimension analysis is implemented on this new mode shape to yield a fractal dimension trajectory. The location of the crack can be determined by the sudden peaks at the fractal dimension trajectory. The applicability and effectiveness of the proposed method is validated by using numerical simulations on damage identification of a cracked cantilever beam.

Abstract: There are a variety of forms of industrial construction equipment load .The structural design engineers replace equipment load by equivalent load to analyze structure while it is impossible to reflect the combination of equipment and structure or synthetically dynamic characteristics exactly. This article use SAP2000 to provide three kinds of load input modes for blast furnace equipment in chemical buildings, and that blast furnace equipment should be involved in the overall structure of the modeling analysis in order to obtain accurate load information.

Abstract: Steel reinforced concrete structures are organic combination of steel and concrete and the calculation formula of inter-story drift should be between them.The calculation formula of storey yield drift for reinforced concrete frames is obtained by adding the deformantion of beams, columns and joints, and the comparison shows that theoretical results agree with test data. Inter-story yield drift ratio for steel reinforced concrete (SRC) framees are proposed by using the same assumption and procedure, and story drift limit for SRC frames with certain assurance probability are proposed according to relationship of four seismic performance levels. The conclusion obtained provide reference for engineering design of SRC frame structures.

Abstract: Steel tied arch bridge with outward rib was adopted in Aixihu bridge in Nanchang city, in which steel girder width was 73 m. Outstanding features, such as large ratio of width to length, outward inclined ribs, four groups arrangement of spatial suspender existed in this bridge. Beam-column finite element model (FEM) and shell-beam FEM for the arch bridge are established respectively. The mechanical behaviors of the arch ribs and the girder analyzed by two different models are compared. The calculation results show that both beam-column FEM and shell-beam FEM can be used in the analyzing the mechanical behavior of arch ribs, while for the wide girder mechanical character analysis should not depend on beam-column FEM but shell-beam FEM.