To investigate bending characteristic of the other portion except hinge of the column bottom under lower to higher levels of axial force, two experiments were conducted. This paper reports the experiment, its results, and comparison of experiment result and calculation on bending moment capacity. The followings were identified.

1) The compressive strength of the portion increased by a factor of 1.7 due to rebars and was maintained up to approximately 2.0% in compressive strain.

2) The correlation between axial force and bending yield moment and bending capacity of the portion could be revealed and accurately estimated using proposed equation.

In this study, a machine learning approach using the Isolation Forest, one of the anomaly detection machine learning algorithms, was proposed to exclude anomalous values from the training data. In addition, the influences of the modified training data on the prediction of airborne chloride were investigated. Therefore, it was found that combining statistical processing with the Isolation Forest improves the accuracy of predicting airborne chloride. Furthermore, it was revealed that the most contributing feature importance to the prediction of airborne chloride is the significant wave height.

This paper presents the results of comparing the acceleration reduction caused by soil-structure interaction in two low-rise buildings with different foundation types. From the observation records, the pile foundation has a greater acceleration reduction compared to the spread foundation. An analytic procedure to predict the reduction caused by dynamic interaction is also presented. The difference in transfer function value at the natural frequency between the base-fixed and sway-rocking models indicates the effect of inertial interaction, while the difference between the free surface and the base input represents the effect of kinematic interaction.

We have done a forward modeling of a characterized fault model, which consists of SMGA’s (Strong Motion Generation Areas), LMGA’s (Long-period Motion Generation Areas) and background areas, for simulating velocity and displacement waveforms observed very close to the seismic faults and crustal deformations during the 2023 Kahramanmaraş earthquake (M_w7.8) in Türkiye. Observed large-amplitude velocity pulses and permanent displacements along the fault have successfully been reproduced by the proposed characterized fault model. We have also examined effects of SMGA and LMGA on near-fault ground motion characteristics.

In the previous study, authors proposed new flare-like structure for the purpose of improving buckling property and evaluated the ultimate properties of high-damping rubber bearings with proposed structure theoretically and analytically. In this study, various properties of high-damping rubber bearings with proposed structure were evaluated experimentally. In addition, by comparing with the experimental results, validity of theoretical equation and analysis model proposed in previous study were evaluated.

The aim of this study is to clarify characteristics of bearing capacity and settlement of spread foundation after reaching ultimate bearing capacity under horizontal and vertical combined loads. A formula that can equivalate bearing capacity after reaching ultimate bearing capacity was presented. In addition, the validity of the proposed method was examined by experimental results. These results show that settlement of spread foundation after reaching ultimate bearing capacity is little.

In this paper, a practical calculation method for long-term deflection of void slabs which was developed for the purpose of weight reduction and improvement of workability was proposed. The calculation method is based on the method of calculating long-term deflection of solid concrete slabs shown in the AIJ RC standard, and bending rigidity of void slabs is assumed to be equivalent to bending rigidity of solid concrete slabs. Also, by calculating long-term deflection using time history of drying shrinkage strain and creep deformation, calculated value of time history of long-term deflection of void slab was shown.

For RC high-rise buildings higher than 200m, it is necessary to develop structural design method by wind force repeated thousands of times. Main conclusions of RC columns are as follows.

1. Some of tests are failed by repeated loads smaller than the ultimate bending strength Q. For a concrete strength of 60N/mm², one of specimens is failed by a repeated load of 0.85Q with axial force ratio of 0.3, and for 36N/mm² by a repeated load of 0.80Q with 0.3 or 0.5.

2. Column failure is caused by the magnitude of compressive strain in the cover concrete on compression side.

The dividing walls in the attic space of the wooden building of the Second Faculty of Engineering of Tokyo Imperial University were metal lath with mortar finish to both sides of the studs. The current Building Standard Law requires these dividing walls to be of quasi fire-resistive construction. Two specimens were examined for their ability to resist a 45-minute standard fire exposure. The heat transfer analysis was used to discuss the effect of mortar thickness on the temperature distribution in the wall.

A form generation method is proposed for generating piecewise developable surfaces based on the membrane theory of shells. Design parameters are the principal stresses of horizontal projected stresses and load distribution. The Gaussian curvature of discrete surfaces is used to evaluate developability. It is shown that simple smooth developable surfaces can be generated by appropriately specifying the principal stresses. More complex developable surfaces can also be generated by minimizing the sum of squares of the Gaussian curvature of the surface. Numerical example confirms that piecewise developable surfaces can be generated by applying line loads along the internal boundaries.