China has a considerable demand for the improvement of the rural residential environment. However, limited knowledge of the rural situation and insufficient consideration of residents' demands impede development. ...
详细信息
China has a considerable demand for the improvement of the rural residential environment. However, limited knowledge of the rural situation and insufficient consideration of residents' demands impede development. To improve the current living environment, it is essential to understand the current conditions of rural housings and the decision-making process of residents on new residential construction. This study established an improved Consumer Decision Model (CDM) that describes the decision-making process of rural residents on residential construction. Based on the CDM model, a questionnaire survey was conducted to understand the rural residential situation and the expectations of residents on new construction. An in-depth analysis was carried out by logistic regression to develop the impact paths of crucial factors that affect residential construction cost and duration. A three-tier demand hierarchy was then established to depict the relationship between residents' demands and preferred decision. Policy suggestions for the improvement of the living environment in rural areas were also proposed at the end of the study. The result extends the CDM theory to the application of credence goods (e.g., rural residences) and also provides an impact path model to understand the influencing mechanism in determining rural residential decisions on new construction.
To eliminate the shortcomings in the grouting sleeve and other connection forms in precast concrete shear wall structure induced by the poor grouting, difficult quality assurance, low construction efficiency, and high...
详细信息
To eliminate the shortcomings in the grouting sleeve and other connection forms in precast concrete shear wall structure induced by the poor grouting, difficult quality assurance, low construction efficiency, and high cost, a new type of monolithic assembled concrete shear wall structure with non-connected vertical distributed reinforcement was proposed in this paper. The new shear wall structure is composed of middle precast wall panels and cast-in-place boundary members. The vertical distributed reinforcement in the middle precast wall panels is not connected between the upper and lower floors. This technique was based on the normal section bearing capacity of equal strength and inclined section bearing capacity of equal strength compared with the cast-in-place shear wall structure. Three full-scale models of precast shear walls and one cast-in-place contrast specimen were tested for their seismic performance under pseudo-static loading. All precast specimens are cast based on the manufacture specification of the factory. By analysis of test results, including the failure modes, load-lateral drift hysteresis curves, bearing capacity, hysteretic characteristics, deformation components, ductility, rigidity degeneration, energy dissipation, and strain distribution, all the specimens were obtained and compared. Comparisons between test results indicate that the proposed shear walls have a similar bearing capacity as that of the cast-in-place shear wall and improved energy dissipation and ductility. Moreover, the specimen with inclined reinforcement performs better in drift capacity compared to companion specimens. The contribution of flexural deformation to the total displacement of each specimen is the largest, follow by the contribution of shear deformation, and the contribution of slip is the smallest. The strain of non-connected vertical distributed reinforcement of the precast panel did not yield during the loading process. The cross-section of the precast shear
隐含碳排放限值是建筑结构碳排放量化调控与减碳目标保障的关键指标。本文从社会“碳中和”所需减碳路径出发,依据建筑结构保有与需求量中的新建与既有结构构成比例,提出减碳目标分解方法,为既有结构低碳维护与新建结构低碳设计提供与宏观年度减碳需求相匹配的限值预设依据。依托“双碳”目标的减碳需求构建行业预期发展情景,得出在维持现状、常规预估、拆除限制、减量预估四类典型情景下,2022年我国新建建筑结构隐含碳排放限值分别为442.6 kg CO_(2)e·m^(-2)、456.2 kg CO_(2)e·m^(-2)、485.9 kg CO_(2)e·m^(-2)、616.0 kg CO_(2)e·m^(-2)(对应结构设计使用年限50年);给出2022—2060年建筑结构建造与维护碳排放限值的变化趋势,厘清了新建结构总量控制、既有结构延寿等减碳措施促使结构单体隐含碳排放限值宽松的成效。进一步从概率化调控、区域特征量化、可操作性、数据驱动优化等方面,提出了建筑结构隐含碳排放限值设定的相关建议。
暂无评论