This paper describes the results of slip tests and stress relaxation tests on nigh strength bolted friction joints in various conditions to clear the behavior of the joints in deformed H-Beam. Test results show that the projection from outside of the flange makes little difference to the slip characteristics of the joints. And FEM analysis based on the adhesive model can explain the behavior well.
Carried out in this study is the experiment using a split tee joint subjected to monotonous tensile load in order to evaluate the strength and deformability of high strength bolted tensile joints with high strength and high ductility bolts (waisted shank bolts). Then, the mechanical behavior of the joint with waisted shank bolts is discussed on the basis of the experimental results. Furthermore, the strength and the failure mode of the joints are evaluated according to the design standards, Eurocode and JSSC code for this type of joints. As a result, it is possible to apply these codes to the design of the joint with waisted shank bolts basically.
ABSTRACT It is well known that the strength of the weld metal depends on cooling time and chemical composition of weld metal. In this paper, empirical formulae estimating the tensile strength and the yield strength of the weld metal considered with cooling time and chemical composition are proposed. The tensile strength of weld metal in beam to column connection is higher than that of butt joint by 3%. For steel with the grade 400NImm2, thestrength of the weld metal is higher than that of the steel, even if heat input (HI) and interpass temperature (IT) arelarge. While, for steel with the grade 490N/mm2, the tensile strength of the weld metal is less than that of the steel, even if HI and IT are small, when chemical composition Ceq≤0.250.
To elucidate the reason why the compressive behavior of specimens corrected by heating differs from that of virgin specimens, elastic-plastic large deformation analysis was carried out. When considering only residual imperfection, the experimental phenomena could not be simulated. Then considering not only residual imperfection but also the rise of yield stress made by work hardening, the experimental phenomena could be simulated totally. From the analysis, it was elucidated that the reason why the buckling mode of specimens corrected by heating changed was both residual imperfection and the increase of yield stress made by work hardening.
Mechanical behavior of hybrid steel I-girder assembled by high manganese non-magnetic steel (Hi-Mn) and SM490YA steel (SM) under uniform vertical loading was investigated based on the results of elastic-plastic large deformation analysis. In the case of hybrid girder, vertical displacement was larger than that of Hi-Mn girder and smaller than that of SM girder. The maximum load was same as that of Hi-Mn girder. Out-of-plane displacement in the web was larger than those of Hi-Mn and SM girders. When the horizontal stiffener of hybrid girder was moved 10% down, or thickness of the web was increased 10%, out-of-plane displacement could be controlled.
Shear panel damper using low yield strength steel have been widely used for passive control of buildings against earthquakes. During design process, a series of time-history analyses are generally conducted, in order to confirm earthquake response of the damper and building. Accurate analytical model of the damper is necessary, since the damper plays an important role in overall performance of the building. In this study, cyclic loading tests have been conducted to verify the hysteretic behavior for earthquake response of the damper. Analytical model was also proposed. This proposed model could be evaluated hysteretic behavior of the damper in the plastic range.
This study shows investigations of behavior of an integrated column by multi steel pipes using damage control design. Damage control design method leads major damage into shear panels that connect each steel pipe. Shear panels are built up by low yield point steel, and they have hysteretic energy dissipation properties and reduce acceleration and displacement response of a whole column. Therefore damage of steel piers can be reduced. The experimental study with two types of specimen has been performed. The test results show that damage control design method leads major damage into shear panels.
This is an investigation of method for reduction of residual displacement of steel frame subjected to earthquake ground motion. Considering slip-type restoring force characteristics of column-base, the magnitude of lateral displacement of 5-story weak-beam steel frame model is estimated by earthquake response analysis. To reduce the residual displacement of the weak-beam steel frame, the design method of elastic 2nd floor beam together with elastic column is proposed.
In the past, we had investigated the number of 1412 steel on the basis of the mill sheet in order to clarify these steel quality, and mechanical properties and chemical compositions of these steel had been shown  . However, in these papers, the relationship between their mechanical properties and chemical compositions had not been discussed. In this paper, we investigated the relationship between mechanical properties(tensile strength and yield strength) and chemical compositions(Carbon, Silicon and Manganese) including PCM and Ceq, and these results were shown.