Inclusive urban renewal requires balancing the interests of multiple stakeholders; however, many renewal projects stall due to interest conflicts, rooted in the long-standing marginalization of residents’ subjective fairness perceptions. This study introduces the Fehr–Schmidt inequality aversion model to characterize residents’ fairness preferences, constructs a tripartite evolutionary game model involving governments, developers, and residents, and uses MATLAB numerical simulations to reveal the influence of key parameters on system steady states. The findings show that: (1) the system admits eight pure-strategy equilibrium solutions, seven of which can evolve into evolutionarily stable strategies within specific parameter ranges; (2) the intensity of higher-level government accountability, residents’ policy-based compensation and subjective fairness perception, and penalties for developer violations all exert significant influence on the smooth implementation of inclusive urban renewal; and (3) various regulatory policies exhibit complementary and synergistic attributes, whereas any single governance instrument has inherent limitations. This study provides a reference for multi-stakeholder collaborative governance in inclusive urban renewal.
The experimental method is significant for exploring the mechanical response and damage evolution of geotechnical engineering. However, quasi-static tests on geotechnical engineering structures subjected to non-uniform loading excitation remain scarce. Based on quasi-static testing and soil response analysis methods, a local pushover testing method was proposed. First, a novel pushover testing platform was developed. It consisted of a composite model container, a reaction frame, and a multi-channel electric servo loading system. The non-uniform loading program was implemented by establishing a lateral driving system that included a local pushover plate and horizontal electric servo actuators. Subsequently, the applicability of the proposed pushover testing method was preliminarily verified through an experimental pushover test conducted on sandy soil. The results show that this method effectively captures the non-uniform deformation behavior of soil subjected to non-uniform loading excitation. The local pushover loading pattern can lead to a noticeable difference in soil displacement between the driving plate zone and the slave zone. A stress attenuation mechanism in the soil was revealed, with stress decreasing in the following order: highest at a pushover distance of 30 cm in the driving zone, followed by 100 cm in the same zone, and lowest in the slave zone. This study can provide a foundation for further investigation into the responses of soil–underground structure systems under non-uniform loading.
Blasting excavation of adjacent tunnels can induce significant vibrations in existing underground structures under complex spatial constraints. This study investigates the dynamic response and vibration control of an existing water diversion tunnel subjected to blasting-induced disturbances from an adjacent tunnel. Field monitoring, three-dimensional numerical simulation, and blasting parameter optimization were integrated to reveal the vibration characteristics and control mechanisms. The propagation characteristics of blasting vibrations were first analyzed based on field measurements. A three-dimensional dynamic model was then established using MIDAS GTS NX and validated against the monitoring results. The vibration velocity, displacement response, and stress evolution of the existing tunnel lining were systematically investigated. Results indicate that vertical vibration dominates the dynamic response, while stress evolution reflects the propagation, energy transfer, and dissipation processes of blasting stress waves. Furthermore, entropy weight–gray relational analysis identified six key factors influencing blasting vibration. Based on these factors, blasting parameters were optimized by reducing energy concentration. Field verification demonstrated reductions of 11.05%, 10.69%, and 21.54% in vibration velocities along the X, Y, and Z directions, respectively. This study provides insights into vibration response mechanisms and effective control strategies for similar underground engineering projects.
Precast concrete ductile connections are designed to dissipate energy through yielding of the ductile rods, but early cracking and cover spalling of the joint concrete have been reported to limit the plastic deformation developed by the rods. This study examines whether steel fibers suppress this damage in a connection whose joint transverse reinforcement has been reduced. Five full-scale interior beam–column subassemblies, one monolithic specimen and four DDC ductile connections, were subjected to reversed cyclic loading in accordance with ACI 374.1-05, with joint transverse reinforcement ratios of 1.59% and 0.79% and steel fiber volume fractions of 0%, 1% and 2% as the variables. Joint crack width, joint shear strain, and the strains in the joint transverse reinforcement and in the ductile rods were measured. When the transverse reinforcement ratio was halved without fibers, the joint crack width increased, yielding of the transverse reinforcement was recorded, and the lateral resistance retained in the third cycle at the acceptance drift level did not satisfy the strength criterion of ACI 374.1-05. With 1% of steel fibers in the same detail, the joint crack width decreased, and no yielding of the transverse reinforcement was recorded, but the secant stiffness around zero drift in the negative loading direction did not satisfy the stiffness criterion of ACI 374.1-05. With 2% of fibers, the joint crack width decreased further, the three acceptance criteria were satisfied, and load was sustained up to large story drift ratios. The maximum measured joint shear strain was lower than the strain at which the joint shear strength is developed; for the specimen with 2% fibers, this observation applies only up to the 2.0% drift level. One specimen was tested for each configuration; within the configurations tested, the steel fibers were observed to restrain crack propagation in the joint concrete and to affect the cyclic behavior of the connection.
The sustainable conservation of vernacular dwellings requires not only the preservation of historic architectural fabric but also an understanding of how residents perceive and use traditional residential built environments. This study examines how four perceived attributes of vernacular residential built environments (authenticity, distinctiveness, aesthetics, and functionality) are associated with residents’ place attachment and built heritage conservation behavioral intention. Survey data from 1000 adult residents across five Dong-village contexts in southwestern Huaihua, China, were analyzed using partial least squares structural equation modeling with mediation, moderation, moderated-mediation, and supplementary multigroup analyses. All four built-environment perceptions were positively associated with place attachment, with distinctiveness showing the strongest relationship (β = 0.421), followed by functionality (β = 0.350). Place attachment was positively associated with conservation behavioral intention (β = 0.432), and significantly mediated all four perception–intention relationships through complementary mediation. However, tourism involvement did not significantly moderate the functionality–attachment or aesthetics–attachment relationships, and the corresponding moderated-mediation effects were nonsignificant. Exploratory Southern–Northern comparisons suggested directional contextual differences but lacked sufficient measurement invariance for confirmatory interpretation. The findings indicate that the long-term conservation of vernacular built heritage depends on balancing the preservation of culturally distinctive architectural character with the continued residential usability of traditional dwellings and settlement environments.
