This paper presents a rehabilitation method on tensile strength of a corroded steel plate, which is reinforced by wire nettings or rebars with resin. In order to evaluate the effects of the method quantitatively, the rehabilitation work was conducted for the test plates with the same corroded surface made by drilling artificially. Ultimate behavior and tensile strength were investigated through axial tensile tests, changing the reinforcing condition. From the results, it was clarified that this rehabilitation method can enhance appropriately up to the tensile strength of the non-corroded plate.
This paper shows a method of member proportioning for cylindrical latticed roofs subjected to several loads. Also this paper investigates elastic plastic buckling strength of members for cylindrical latticed roofs designed based on the present method. Firstly, this paper describes briefly the method of member proportioning. Secondly, maximum load of cylindrical latticed roofs of which members designed based on the present method is investigated. Also the elastic plastic buckling strength of members for the latticed roofs is investigated. Finally, the effectiveness of the present method is discussed based on above investigations.
Two Kinds of splice plate of friction type connection using high tensile bolt are connecting plate and cover plate. High strength bolted cover plate is used for repair in order to recover load-carrying capacity of corrosion-damaged steel structures. However, the mechanism of load transfer of base plate and cover plate is not clarified. Therefore, in this study finite-element analysis of repaired connection model using high strength bolted cover plate subjected to tensile load was carried out in order to clarify this mechanism.
In this research, a residual loading capacity of corroded steel pipe pile was investigated by FE analysis. According to the analysis results, although the effect of eccentricity for a residual thickness was not so high, the damage location and distribution had a profound influence on the loading capacity. In addition, a position of damaged steel pipe pile contributed little to the loading capacity in both 2-D and 3-D frame models. However, in the case of 3-D frame model, the capacity decreased when the loading position reaches the deck edge.
We conducted loading tests in the range of large deformation for RHS columns in order to investigate restoring force characteristics with strength deterioration due to local buckling. Manufacturing processes, steel grades, width-thickness ratios and et al are employed as parameters. The major findings obtained in this study are as follows:
(1) Cold-formed columns deteriorate more significantly than weld-assembled columns.
(2) Proposed model for restoring force characteristics show good agreements with test results.
The strength evaluation of the gate arm against frictional moment at trunnion bearing is one of the most important part in the safety assessment of the radial gate. In this study, we examined the ultimate strength of the gate arm against the moment using the three gate models which had the different trunnion stiffener length each other. The result showed that the ultimate strength increased with the elongation of the stiffener, and the bending moment distribution along the gate arm went apart from the design distribution with the elongation.
It is important to evaluate the damage of the building structure and the furniture from the viewpoint of the BCP. The purpose of this paper is the analysis in the parallel damage evaluation of buildings and the furniture in the building when structural durability is changed. Targeted structure is middle and low-rise office building in the steel frame. This paper sets the Qu/Qun (the horizontal load bearing capacity; Qu / the required held horizontal yield strength; Qun) as the analysis parameters. In this study, it performs a response value evaluated by the seismic response analysis, the damage evaluation of the building itself is analyzed by earthquake losses calculated by the Seismic Risk Analysis. Moreover, the effect of the furniture in the building is analyzed by the evaluation of overturning ratio. As a result of damage evaluation of building and furniture in the parallel analysis and increased the Qu/Qun, it can be realized that to enhance the accuracy of the analysis regarding the seismic safety of the building.
The authors have developed a passive variable friction damper (VFD) which produces a decreased frictional force when its displacement exceeds a predetermined value. The purpose of this study is to evaluate the response flexural deformation control effects of steel super high-rise buildings using VFDs subjected to strong earthquakes. In the present paper, dynamic response analyses and static pushover analyses were conducted using thirty-story frame structure models with VFDs or conventional friction dampers (FDs). The result indicated that VFDs can mitigate flexural deformations compared with FDs in whole building and damper-installed span by 4-7% and 8-32%, respectively.
Bridge restrainers are installed to prevent bridge girders from falling when a large earthquake comes. The design load is determined by only deadweight of the bridge girder. And, collision velocity and cushioning effect of rubbers aren't considered in the design load. On the other hand, weight-drop tests are conducted to evaluate the dynamic performance of bridge restrainers. But, it is evident that weight-drop tests couldn't imitate real bridge mass size. So, authors attempted to imitate the dynamic behavior of bridge restrainers by using non-linear analysis. As a result, it is presented the way of simulating the dynamic behavior of bridge restrainers including cushioning rubber on experimental comparison.
In this paper, an evaluation formula of friction coefficients on bolted joints with aluminum-sprayed splice plates is derived from the results of basic slip tests. It shows that the lower the averaged values of contact pressure which depend on thickness of splice plates, diameter of bolts and tension of bolts are, the higher friction coefficients of bolted joints are. The results of the slip tests of bolted joints show the same relation between the averaged values of contact pressure and friction coefficients of bolted joints.
In recent years, the braces and knee braces have been used for a seismic retrofitting in the steel buildings. Also, the reinforcement of sectional area for steel members has been carried out. This paper proposes a new friction-type joint that is required at the time of these reinforcements. It is remarkable advantages of the proposed joint that the joint does not need bolt-holes and welding. Also, the building can be used while retrofitting construction. In this paper, the shear tests and the relaxation tests were carried out in order to confirm the performance for the structural design. And, the fatigue test of steel composite beam having the proposed joint was carried out. Then, the frictional performances for design are made clear.
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