The influence of the mortar flow value and the effect of the retarding effect of chemical admixtures on the activity index test results were investigated. The main conclusions are as follows. 1) The value of the mortar flow in the activity index test influences the increase or decrease of the air content of the fresh mortar. As a result, the value of mortar flow indirectly affects the compressive strength of mortar. 2) It was considered that the setting retardation effect caused by the type and amount of chemical admixture had little effect on results of the activity index test.

In 2005, foamed plastic insulation materials (EPS, XPS, PUF-B, PUF-S, PF) constructed in the Northern Regional Building Research Institute were collected and their characteristics were measured.

1. In the evaluation of the external appearance, the insulation material installed outdoors that was exposed to ultraviolet rays deteriorated, but the insulation material installed indoors did not deteriorate.

2. There was no change in the thermal conductivity of EPS and PUF-S. In the case of XPS and PUF, it changed until 100 days after construction, but continued to change gradually after that. In the case of PF, the performance continues to change slowly.

In this paper, an experiment was performed to measure the rebar corrosion rate of carbonated RC specimens with different cement types and water-cement ratio, exposed to several different humidity environments. Only when the cover thickness is 10mm and the relative humidity is 90%RH or more, the rebar corrosion rate in blast furnace cement type B is higher than that in ordinary portland cement, and the rebar corrosion rate in water-cement ratio of 60% is higher than that of 50%. The reasonable durability evaluation method for RC buildings considering both the progress of carbonation and rebar corrosion was presented.

In this paper, an experiment was performed to measure the rebar corrosion rate of carbonated reinforced concrete specimens with different cover thickness and carbonation depth parameters, exposed to several different humidity environments. As a result, the moisture content affects the corrosion rate of rebars rather than the cover thickness and the carbonation depth. The experimental results were compared with the relationship between the moisture content and the corrosion rate of rebars measured in the existing reinforced concrete building survey.

Elastic sliding bearings are one of the most common seismic isolators used in Japan. The bearing’s hysteresis loop is typically bilinear in shape, and the mechanical characteristics are mostly determined by the friction coefficient. The dependencies of velocity and temperature on the friction coefficient should be considered to reproduce a realistic dynamic behavior for earthquake response analysis. To evaluate these dependencies of the elastic sliding bearings separately, a novel loading test plan with varying speed and temperature is developed and conducted. A numerical analysis method to distinguish two dependencies is also presented.

The Kintaikyo in Iwakuni-City, which spans the Nishiki-River in Yamaguchi Prefecture, was built in 1673. The design of the arch of this bridge was studied. It was assumed that the arch of this bridge were designed in arch coordinates with multiple catenary. As a result, the design theory of this bridge was derived for the first time. The multiple catenary was identified from the Kintaikyo in Heisei, and The new Kintaikyo drawing for KAKEKAE was created that is harmony and orderly. Based on this drawing, it was proved that a harmony and orderly bridge can be realized by 3D-CG.

Currently, standard analytical models for designing CLT structures are very complicated. In this study, an evaluation method for the restoring force characteristics was proposed to enable structural analysis using a simplified model of elastoplastic bending spring model, which is more practical in structural design. In addition, the validity of the proposed model was examined by comparing its results with those of conventional models and experiments on CLT walls. As a result, although some problems remain in the stiffness evaluation, the lateral strength capacity can be evaluated accurately, and the possibility of applying the model to practical structural design was demonstrated.

In this study, a joint model was developed based on the experimental results, including the reduction in capacity of the nail joints. FEM analysis considering contact between structural panels was also performed to confirm the correspondence with the experimental results. The effects of gaps and contact conditions between structural panels on the maximum load and stiffness of load-bearing walls were also examined, and the effects of face member contact on the variation of test results were shown.

It can be seen that various pre-installed anchors have different stress states and damage states of anchors when the required yield strength is exerted. In order to reproduce this bond characteristic with adhesive post-installed anchors, it is necessary to control the individual bond stress distribution. In this study the adhesion performance is confirmed by performing the installation test, the pull-out test, and the bond test of the long post-installed anchor with the bond stress distribution controlled.

This paper proposes an analytical model relative to the tensile properties of steel fiber reinforced concrete (SFRC). Unlike ordinary concrete, the tensile stress-tensile strain curve of SFRC exhibits, after cracking, a second peak strength. This second peak strength tends to be proportional to the product of the steel fiber aspect ratio, volume ratio, orientation factor, and the 2/3 power of the concrete cylinder compressive strength. Furthermore, the cross-sectional analysis of SFRC flexural members using the proposed model for the tensile properties of SFRC confirmed that the behavior up to the flexural yield moment was evaluated with a high accuracy.

The effect of an adjacent member on the buckling of columns in the frame is examined. Formulas for equivalent stiffness of the adjacent column affecting the focused column is presented. The effect of the adjacent column is classified in three groups, that is the focused member is perfectly braced, buckle simultaneously and the adjacent member is perfectly braced, according to the critical flexural stiffness ratio. Relations between the equivalent stiffness and above mentioned 3 groups are discussed, and the flexural stiffness ratio characterizing the groups are shown, taking the height ratio, axial load ratio as the parameter.

The objective of this study is to investigate the punching shear strength and mechanism of flat slab structure with steel column and steel capital in RC slab based on FEM analysis results. Modeling for FEM analysis on the inner column-flat slab specimens was verified showing agreements with the test results; thus, reliable analytical data on inner stress transferred on the critical sections at punching shear failure. In particular, it was found that the ultimate moment resistance at the column-slab connections attained the upper limit when the shear stress on certain critical section reached its strength.