In this study, we examined the evaluation method and evaluation criteria for evaluating the carbonation suppression effect of finishing materials used for the exterior of reinforced concrete buildings. We proposed a test method for carbon dioxide transmission rate of finishing materials and clarified the relationship with the carbonation ratio by the accelerated carbonation test while 52 weeks. In addition, based on the carbon dioxide transmission rate after the accelerated weathering test and the value of the carbonation ratio by previous studies, we proposed an evaluation criteria for the carbonation suppression effect in consideration of the deterioration of the finishing material.
Part 1 of this study examined the relationship between height and volume of ready-mixed concrete loaded in rotating drum by geometric analysis. As a result, the following was shown within the scope of this study.
1) Rotating drum of truck agitator could be represented by geometric model based on the combination of cones and cylinder.
2) Partial volumes of cone and cylinder cut diagonally with respect to rotating drum are expressed by integral equations. Therefore, the relationship between height and volume of ready-mixed concrete loaded in rotating drum could be quantified.
The purpose of this series of studies is to propose an assurance design method of connection in wooden wall structure calculated on allowable stress design and to verify its validity. In this paper, connecting systems used at the bottom of column in wall structure are classified according to the bending resisting mechanism, and then the calculation method for tension and bending moment of several types of connections depending on their rocking behavior are proposed. As a result of comparison between the wall test with the calculation result, it was indicated that the proposed method was generally appropriate.
Non-structural members like folded roof plates are not considered as lateral braces, but these members may be effective to increase lateral buckling load of H-shaped beams. On the other hand, H-shaped beams are rigidly connected to the columns, which have high warping restraint against lateral buckling deformation. In this paper, partial frame tests of H-shaped beams subjected to cyclic loading are conducted and bracing effect of roof plates and warping restraint effect of beam-to-column joints on lateral buckling of H-shaped beams are clarified and the strength and the stiffening moment are evaluated safe according to the reference.
In the composite slab used for the steel structure, welded wire mesh, which installes for priventing the concrete cracks, acts as the tension reinforcing bars in the fire, and due to membrane action the load bearing capacity can be expected to increase. As a result, there is a possibility that fire protection can be removed from secondary beams. In this paper, the load bearing capacity and ultimate state of composite slab in the fire were examined by carrying out load-bearing fire test to flooring system consists of composite slab and unprotected secondary beam until collapse.
The characteristics of coherence of ground motion at adjacent points were evaluated from the ground motion simulation using 3-D heterogeneous soil models and clarified the relation between the coherence at adjacent points and heterogeneous parameter such as correlation distance and coefficient of variation of heterogeneous soil models. From these results, we also proposed the coherence model of ground motion at adjacent points that could express the coherence of ground motion simulation, by constructing the wave equation considering the variation of the propagation velocity and deriving the correlation of wave field at adjacent points.