In this study, with the aim of streamlining heat curing in cold weather concreting, we analyzed temperature fluctuations, verified the validity of

predicted average temperatures, and verified the effects of reviewing weather forecast values, obtaining the following results.

1) Global warming trends and differences in temperature fluctuations need to be taken into consideration at the planning stage and immediately

before construction.

2) The method of subtracting 4 degrees from the normal value for the average temperature per season is valid.

3) Reviewing based on weather forecast values is reasonable, and curing temperature management during construction is also effective.

This study focuses on the watertight performance of the lip section of EPDM gaskets. Full-scale water leakage tests and FEM analyses were conducted to quantitatively evaluate the relationship between reaction force and watertightness. Accelerated aging tests showed that combined deformation and high temperature (100°C) reduced lip reaction force by about 50%, causing leakage even at design compression. Watertightness declined significantly when reaction force dropped below 8 N/100 mm. FEM analysis confirmed consistency with experimental results and revealed that lip thickness tolerance had twice the impact on reaction force compared to stiffness. Lip pressure is thus crucial for watertight performance.

Wind response characteristics of the Hokekyoji five-storied pagoda is investigated by applying probabilistic statistical method to displacement data during strong wind obtained from image measurements. And rainflow method is used to estimate restoring force characteristics from the displacement data at the five-storied pagoda. Using the estimated restoring force characteristics, an earthquake response analysis is performed with the ground acceleration of the Tohoku Pacific Coast Earthquake as input, and the validity of the estimated restoring force characteristics is verified. Furthermore, wind response analysis is performed using the restoring force characteristics and wind force time series obtained from wind tunnel test results.

The aim of this study is to clarify the bearing capacity and lateral resistance of a square footing after reaching ultimate bearing capacity. A failure mechanism for the ground beneath a square footing under combined load is proposed based on the upper bound theorem. By applying this failure mechanism, the reduction in ultimate bearing capacity of a square footing can be predicted. Furthermore, the bearing capacity and lateral resistance after reaching ultimate bearing capacity are evaluated. The validity of this evaluation is confirmed through comparison with experimental results. The findings may contribute to the seismic design of spread foundations.

This study carried out microtremor measurements at the Kawagoe City Former Harada Residence Misegura and the Kawagoe City Kurazukuri Museum Misegura, both Kurazukuri buildings located within the Kawagoe Traditional Buildings Preservation District in Kawagoe City, to understand the impact of aging over a decade on the natural frequency of Kurazukuri buildings. The measurements revealed that the natural vibration frequency of the Kurazukuri buildings had decreased. The factors that contributed to this were investigated, including the effects of earthquakes, seasonal changes, and aging, and it was suggested that the natural frequency had decreased due to decay associated with aging.

This paper reports a machine learning model to predict moment capacity of interior column-beam joints learning from a database of previous experimental results. Contribution analysis of design factors with the model reveals the effects not previously noted, such as that even though they are equivalent in terms of increasing the tensile force of the reinforcing bars, increasing the cross-sectional area and increasing the strength have different effects and that there is a limit to the effect of increasing the strength.

In order to propose a calculation method for the calculated lateral load strength capacities in the demolition works of multi-layered reinforcement columns and to estimate the location of the neutral axis, lateral load tests were conducted on RC column specimens with the crushed dimension as experimental variables. As a result, by using the proposed calculation formula for the maximum lateral load strengths obtained from the experimental values, the difference between the calculated and experimental values were within 15%, and the calculated values correctly evaluated the experimental values.

This study numerically investigates the seismic response of buildings with unbonded PCaPC beam members with fishbone-shaped frame analyses. Time history response analyses revealed that the ratio of maximum drift angles between bonded and unbonded frames ranged from 0.8 to 1.2 in 60% of cases. Notably, both equivalent linearization method and time history response analyses consistently demonstrated that unbonded frames reached limit states later than bonded frames, indicating a significant damage mitigation effect. Furthermore, response evaluations using the equivalent linearization method demonstrated comparable accuracy for both unbonded and bonded frames when compared to time history response analysis results.

In the seismic design of steel moment resisting frames, large structural members, particularly H-shaped beams with substantial flange thickness, are commonly utilized in high-rise steel buildings to enhance seismic resilience. However, the influence of dimensional variations on the low-cycle fatigue performance of steel beam-end connections remains inadequately clarified. This research investigates this phenomenon through a series of constant amplitude cyclic loading tests on full-scale T-shaped beam-to-column connection specimens, with beam flange thicknesses ranging up to 50mm. The results indicate that the number of cycles to fracture of the connection decreases with increasing specimen size and loading amplitude.