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Zhang Y.,Tianjin University | Zheng X.,Tianjin University | Zhang H.,Tianjin University | Chen G.,China Architecture Design & Research Group | Wang X.,Tianjin University
Frontiers of Environmental Science and Engineering | Year: 2016

In this paper, a quantitative life cycle model for carbon emission accounting was developed based on the life cycle assessment (LCA) theory. A residential building in Sino-Singapore Tianjin Eco-city (Tianjin, China) was selected as a sample, which had been constructed according to the concept of green environmental protection and sustainable development. In the scenario of this research, material production, construction, use and maintenance, and demolition phases were assessed by building carbon emission models. Results show that use and maintenance phase and material production phase are the most significant contributors to the life cycle carbon emissions of a building. We also analyzed some factor influences in LCA, including the thickness of the insulating layer and the length of building service life. The analysis suggest that thicker insulating layer does not necessarily produce less carbon emissions in the light of LCA, and if service life of a building increases, its carbon emissions during the whole life cycle will rise as well but its unit carbon emission will decrease inversely. Some advices on controlling carbon emissions from buildings are also provided. © 2016, Higher Education Press and Springer-Verlag Berlin Heidelberg.

Li X.,Tianjin Chengjian University | Li C.,Tianjin Urban Planning and Design Institute | Chen G.,China Architecture Design & Research Group | Ren S.,Tianjin Chengjian University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

The paper proposed a new transpired collector with vacuum glass-cover board and slit-like perforation, and then studied the thermal performance of solar air heating system consisted of the new collector and regenerator. Using heat balance method and frequency domain regression method, the paper built heat-transfer mathematical model of system and building. The model was verified by experiment to show its correctness. Then the paper took average solar fraction of January as target function to study the effect of collector and regenerator parameters on system performance. Simulated results showed that average solar fraction of January decreased with absorber outer emittance and perforation equivalent diameter. It firstly decreased then increased with average perforation pitch, so suitable pitch values range was P≥0.08 m. It increased with collector area and regenerator volume. However, its increasing rate with regenerator volume would decrease rapidly, so suitable ratio of regenerator volume to collector area was 0.15-0.26 m3/m2.

Yu X.,Southwest Jiaotong University | Gao P.,Southwest Jiaotong University | Liu Y.,Southwest Jiaotong University | Lei M.,Southwest Jiaotong University | Zhang P.,China Architecture Design & Research Group
Chinese Journal of Population Resources and Environment | Year: 2015

Based on the theory of life cycle assessment (LCA), this article analyzes the influence factors on carbon emissions from residential buildings. In the article, the life cycle of residential buildings has been divided into five stages: building materials production period, construction period, operation and maintenance period, demolition period, and solid waste recycle and disposal period. Based on this definition, the authors provide a theoretical model to calculate carbon emissions of residential building life cycle. In particular, the factor of human activities was introduced in the calculation of carbon emissions from the buildings. Furthermore, the authors put forward a model for calculation with the unit of carbon emissions for per-capita living space. © 2015 Shandong Normal University.

Zhang J.,Lanzhou University | Ni Y.,Lanzhou University | Yao Y.,Lanzhou University | Yao Y.,China Architecture Design & Research Group | And 5 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

4 superimposed concrete slabs and 1 cast-in-place slab, which were all built in the square shape, were tested under in-plane low-cycle repeated loading. The 4 superimposed concrete specimens were fabricated with normally reinforced and doubled negative moment reinforced longitudinal joints, and with normally reinforced and doubled negative moment reinforced transverse joints, respectively. The specimens were then evaluated for their performances according to the crack and failure mode, hysteretic characteristics, deformability, ductility, stiffness and energy dissipation capacity, respectively. The results show that the failure mode of the superimposed concrete slabs appears to be shear-slip, while that of the cast-in-place slabs appears to be shear. The superimposed slab with longitudinal joints loaded in the direction perpendicular to the joints has stronger bearing capacity and greater stiffness than the superimposed slab with longitudinal joints but loaded in the direction parallel to the joints, and in addition, the former also possesses a better ductility and energy dissipation capacity. Although the superimposed concrete slab has greater stiffness, its ductility is poorer than that of the cast-in-place slab. Increasing the negative moment reinforcement may improve the ductility, stiffness and the energy dissipation capacity of the superimposed slab, and moreover, it may lead to the more plum Physteretic curves. The precast slabs work concertedly with the cast-in-place concrete layer, and their crack patterns agree basically with each other. It is proposed that to prevent the shear-slip failure, more transverse reinforcement and negative moment reinforcement should be used in realistic applications. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.

Liu C.,China Architecture Design & Research Group | Liu C.,Tianjin University | Fan Z.,China Architecture Design & Research Group | Zhu D.,China Architecture Design & Research Group
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

By increasing the width of coupling beams on one side or both sides has been proposed to mitigate the insufficient shear capacity. The equivalent flexural rigidity of coupling beams proposed in the paper would prevent the seismic action from increasing with the growing coupling beam stiffness. The inter-story drift ratio, dynamic characteristics, lateral stiffness and internal forces of coupling beams under frequent seismic action were analyzed to validate whether wide coupling beams would improve the shear-to-compression ratio. Besides, elasto-plastic finite element analysis of both ordinary beams and wide beams were conducted to compare their hysteretic behavior and skeleton curves, proving that the deformation capacity and ductility of wide coupling beams preceded those of ordinary coupling beams. Moreover, the elasto-plastic analysis of shear wall structure further reveals the seismic behavior of wide beams in the high-rise buildings. The analysis results demonstrate that the shear capacity could be effectively enhanced by widening the coupling beam. Compared the wide beam with the ordinary coupling beam with the same flexural stiffness, the increase of span-to-depth ratio of wide coupling beam would lead to remarkable rotation capacity, ductility and dissipation capacity. Under the rare seismic effect, wide coupling beam would perform well in decreasing inter-story drift, plastic hinge distribution, shear force and shear bearing capacity. ©, 2015, Science Press. All right reserved.

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