This paper describes a study on the limit state 2 of steel girders subjected to shear force, as defined in the Specifications for highway bridges. In this study, shear loading tests of steel girders were first conducted, and the state that can be treated as the limit state 2 were located on the obtained load-response curves. Next, the results obtained by parametric analysis based on the proposed mechanical model were examined, and a strength evaluation equation for the state that can be treated as limit state 2 was presented. Comparison with the parametric analysis confirms that the proposed strength evaluation equation can accurately estimate the strength with an error of ±6%.

 In recent years, Steels for Bridge High-performance Structure (SBHS) has been standardized in Japanese Industrial Standards (JIS). Compared with conventional steels and SBHS500, there is a lack of information on SBHS400, which was specified in JIS the latest among three types of SBHS and SBHS700, which has not been specified in Japanese Design Specifications for Highway Bridges yet. In this study, the mechanical properties of SBHS400 and SBHS700 were collected and compared with those of conventional steels and SBHS500. Then, the axial compression behavior of simply supported plates made of SBHS400 and SBHS700 was examined in detail. Axial compression tests with six stub-column specimens and analytical investigations clarified the effects of stress-strain curves of steel materials and residual stress distributions on axial force-axial displacement relationships. Parametric analyses complemented the experimental results and formulas which can evaluate the load-carrying capacity of uniaxially compressed simply supported plates made of SBHS400 or SBHS700 were proposed.

 In recent years, Shinkansen construction tends to be delayed significantly from the original plan, and the reduction of construction expenditure due to financial constraints on Shinkansen construction is one of the reasons for the delay. Although the delay of Shinkansen construction may cause economic loss, there are no previous studies that comprehensively analyze the causes of the delay and its economic and financial consequences, while certain cases have been studied separately. In this study, we quantitatively evaluate the delay of Shinkansen constructions. Then, based on assumptions regarding the relationship between financial constraints on Shinkansen construction and Shinkansen construction delays, we analyzed the effects of the current financial constraints on the national economy and tax revenues. The results indicated that the current financial constraints may cause significant economic and fiscal losses, such as a decrease in cumulative nominal GDP (up to about 266 trillion yen) and tax revenues (up to about 35 trillion yen) by 2050. In order to curb these losses, it is considered necessary to modify the austerity fiscal policy, spend sufficient project cost, and accelerate the construction of Shinkansens.

 The increase in the number of "regional experience seekers" has been attracting attention in recent years as a revitalization measure in rural areas. In particular, the growing number of such people could help to resolve the shortage of community leaders. The promotion of behavioral change among uninvolved people is highly expected to solve this problem. In this study, we clarified the factors that lead to the step-up to "regional experience seekers" focusing on the uninvolved people in Japan. Then, we categorized the candidates for "visiting regional experience seekers" who were expected to become the leaders of the community among the regional experience seekers, into 11 types of personalities. After that, we clarified the elements to improve to get them involved with the community according to each type of personality. Results indicated the following: 1) Younger people and people with hobbies and interests are more likely to step up to the next level. 2) There are trends in the elements of improvement demanded by each person type, such as public servants and time availability, and couples and the understanding of their partner. 3) Regardless of the person type, people feel that financial aspects such as travel and accommodation costs are a burden.

 In order to manage a sustainable community in the midst of an aging society, international climate change, and frequent disasters, it is useful to inherit the wisdom and ingenuity of local lifestyles rooted in the local cultural climate. In this study, it is focused on archiving function of the Crossroad Game, which is used in disaster prevention education and pre-disaster reconstruction, and examined the transmission of memory that emphasizes dialogue and makes it possible to relive the connection between the ordinary and the extraordinary. The purpose of this study is to clarify the structure of the narrative field in the making of the Crossroad Game. The study area is Kumamoto City, Kikuchi City, and Asagiri Town in Kumamoto Prefecture, which have experienced various disasters in recent years. The analysis of the content of the crossroads questions allowed us to understand the “Ba” where the story was passed down with the two axes of self ⇔ others and active ⇔ passive. The results also showed that the content and “Ba” of the questioning can be passed on to the next generation. The content of the questions and the “Ba” where they were asked could be passed on as a dilemma that anyone can relive, including the experiences of others, at the “Ba” where storytelling takes place.

 Map matching is a technique for identifying a vehicle's traveling route from probe vehicle data with positioning errors. This is a pre-processing step in traffic survey, and the information obtained by map matching is used as traffic information. This paper focused on a method of accumulating traffic information with map matching. Candidate routes for map matching will be searched and selected by utilizing travel time information obtained from past travel routes as traffic information. Map matching and database updating are repeated for each trip to accumulate travel time information in the database. It was shown that data accumulation based on the Gaussian mixture model contributes to improving the efficiency of data accumulation.

 This study introduces the background of the introduction of “Omoyai Taxi, ” a ride-sharing taxi service with real-time on-demand allocation system that began operating in Arao City, Kumamoto Prefecture, in October 2020. Using one year of reservation log data, we continuously analyzed the actual conditions of use and operation, user evaluations, competition with existing public transportation services, and comparison of operational efficiency with conventional taxi services. The results showed that the number of users of this service has doubled, that it is a complementary service to buses, that high frequency users have a fixed destination and time of day, and that CO₂ emissions and fuel costs can be reduced because the total distance traveled is shorter than that of conventional taxis.

 City residents’ recognition of policy in realizing a compact city has been pointed out as crucially important. Nevertheless, a Ministry of Land, Infrastructure, Transport and Tourism survey indicates city residents’ self-identified recognitions of compact city policy as generally low. Therefore, we administered our own questionnaire survey for this study to ascertain whether city residents have misunderstandings about compact city policy contents. Results of the analysis produced several findings: 1) A high percentage of city residents misunderstand withdrawal from mountainous areas and the construction of tower condominiums as a compact city policy. 2) The rate of misunderstanding is rather high in the group with high self-identified recognition of the compact city policy. It is noteworthy that information provided by local governments about compact city policy might itself be misleading, because groups with high selfidentified recognition also have high levels of trust in governments.

 In order to clarify the fatigue characteristics of the concrete floating of the offshore wind platform, fatigue loading tests were conducted on the small-scale partial specimens under constant compressive stress condition assuming for the service environment. As a result, the fatigue life was about 10² times shorter in water than in air, as in the past researches. In addition, when the stress-intensity ratio of the maximum amplitude was large, the fatigue life tended to be shorter at the joint than at the center. It was found that when the maximum amplitude was 70%, the fatigue life at the joint was one order shorter than that at the center. It is considered that the contact state of the joint surface has a great influence. It was confirmed that the fatigue life of PRC members (f_ck’= 60 N/mm²) can be roughly evaluated by applying the fatigue strength formula in the JSCE specifications.

 To protect marine steel structure from corrosion in subtropical climate and rough sea area, it is necessary to understand effect of cathodic protection and cathodic current flowing into carbon steel and seawater resistant stainless steel. In this study, we conducted a cathodic protection test using carbon steel and seawater resistant stainless steel from submerged zone to splash zone. Cathodic protection was effective for carbon steel in submerged zone. However, the average cathode current density flowing into carbon steel piece in submerged zone was about ten times different between the steel test pieces. The average cathodic current density flowing into seawater resistant stainless steel from submerged zone to low water level was almost the same as the normal protection current density.

 In this paper, new analytical method to introduce prestress is developed in order to have more precise prediction of friction loss of tendon forces as well as centripetal forces due to arbitrary curved tendon in PC structures with arbitrary 3-dimensional configuration. Using the development of this proposed method, it is possible to calculate the elongation amount at the end of the tendon containing the deformation of concrete, moreover the effect of the anchorage-seating loss can be also rationally calculated. Numerical analyses are performed using the proposed method for overhang erection of actual bridges example of prestressing and PC structures with helical curved surfaces, then the validity of the proposed method and issues in applying the initial strain method to prestressing problems are discussed. Furthermore, based on actual examples of tension management of PC component girders, a prestressing management chart is drawn using the proposed method, and improvements to procedure to draw the conventional prestressing management chart are also examined.

 In the time of large-scale earthquake disaster, falling down of power transmission cables and poles can cause road blockage to interfere activities of firefighters to extinguish fire in historical areas with narrow roads. The purpose of this study is to develop the methodology to analyze the effects of undergrounding of cables and poles to prevent their collapse. Then, it is applied to the area near Kamishichiken street in Kyoto City to analyze Quantitatively and show effects of undergrounding of cables and pole. The area where the fire fighting activities are difficult to conduct was reduced by undergrounding electric poles and then, disaster reduction effects were observed through the analysis.

 As part of the author’s research main agenda how to expand overseas construction business by use of “High Quality Infrastructure Export Initiative” to encourage Japanese companies which are related to construction and plant machinery industries, this paper indicates the process of local staff recruitment method during the author engaged as a director general of a Japanese construction company from February 2019 to December 2021established in Republic of Kyrgyzstan. This paper also analyzes issues arisen through these activities and presents solutions to those issues.

 This paper specifically indicates the process of establishment of a Japanese affiliated company in Republic of Kyrgyzstan in December 2017 and the following human resources management data such as recruitment process of employees including selection criteria for recruitment. Using these studies, beneficial methods of recruitment for local employees of Japanese overseas subsidiaries are presented in this paper.

 It is inevitable that a decrease in the working population will lead to a shortage of skilled bridge inspectors due to the declining population, low birthrate and aging population. It is important to improve and equalize the quality of the inspection data, which is the basis for understanding the condition of bridges, in order to allocate an appropriate and optimal budget and to formulate a life-extension repair plan. In addition, it is necessary to grasp the progress of the damage appropriately, to make an accurate diagnosis, and to plan appropriate countermeasures.

 In this study, we proposed a technique to support the inspection of bridges in the field (external work) by visualizing damaged area using heat maps based on 3D point cloud data of the bridge to be inspected, and by finding damage in the heat maps to support the bridge inspectors. The proposed method was evaluated by infrastructure engineers, and the requirements and issues for the field support technology were summarized.

 For residential relocation as an adaptation measure to sea level rise due to climate change, this study estimated costs, land-use changes and transfer distances for the Japanese coasts. A simulation was carried out to allocate affected households to available lands in ascending order of geographical distance from the inundation area. The resulting estimated relocation costs in 2050 and 2070 were 117-118 trillion yen and 150-151 trillion yen for SSP5-RCP8.5, and 100-101 trillion yen and 108-109 trillion yen for SSP1-RCP2.6. These amounts were close to the lower ends of the ranges of relocation costs in previous studies. With regard to land-use changes, the use of wastelands increased over time, whereas the uses of agricultural land and forests decreased over time. Transfer distances decreased over time as a population decline led to more wasteland being closer to the inundation area.