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Feng P.,Tsinghua University | Zhang Y.,China Architecture Design & Research Group | Hu L.,Tsinghua University | Gong D.,Tsinghua University
Thin-Walled Structures | Year: 2017

The elastic buckling load of an axially compressed piecewise member was derived under various ideal boundary conditions based on the differential element method; then, the result was simplified for a symmetrical member. The theoretical results were found to be consistent with existing formulas for the elastic buckling load of uniform members. Then, the elasto-plastic buckling of an axially compressed piecewise member composed of steel and elastic materials was investigated and found to be quite different from that of a pure steel member, and a theoretical analysis approach was developed. In elasto-plastic buckling analysis, the load-bearing capacity of the steel section in the ultimate state is determined considering initial imperfections and steel hardening. Furthermore, the symmetric method for obtaining the load-bearing capacity of this member was obtained based on the ultimate state of the critical section, which is simple and reparative for design. The theoretical results of the elasto-plastic buckling analysis were consistent with experimental results, therein obtaining an average error of 4%. © 2016 Elsevier Ltd


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.


Fan Z.,China Architecture Design & Research Group | Wang J.,China Architecture Design & Research Group | Wang Y.,China Architecture Design & Research Group | Nie J.,Tsinghua University | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

As large tensile stress may occur in the bottom core tube walls of high-rise buildings, elasto-plastic finite element analysis model of steel plate concrete composite shear walls(SPCW) were established to fully study the seismic behavior of SPCW under tension-bending condition. Axial tension ratio definition was proposed and influences of axial tension ratio on SPCW were researched including lateral stiffness, hysteretic curve, equivalent viscous damping coefficient, displacement ductility factor, deformation capacity and bearing capacity. Under tension-bending stress, bearing capacity of SPCW has no obvious decrease at ultimate deformation and SPCW has full hysteretic curves and large deformation ability. The SPCW bearing capacity and displacement ductility factor decrease with the increase of tension ratio. When the tension ratio is greater than 0.2, initial lateral stiffness is decreased by more than 50%. The lateral stiffness decreases with the increase of reversed horizontal loading. Results of sealed SPCW specimen tests under low-cycle and reverse horizontal loading show that multiple horizontal through-depth cracks appear on the specimen surface and rebars fracture at root finally. The measured SPCW bearing and ultimate deformation capacities agree well with the elasto-plastic finite element analysis. The SPCW has good bearing and deformation capacities and can become an effective method to solve the excessive tension stress under earthquake action in super high-rise buildings. © 2016, Editorial Office of Journal of Building Structures. All right reserved.


Wang J.,China Architecture Design & Research Group | Fan Z.,China Architecture Design & Research Group | Xing C.,China Architecture Design & Research Group | Fan J.,Tsinghua University | And 3 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

Axial compression ratio is closely related to the seismic behavior of steel plate concrete composite shear walls(SPCW). Effects of axial compression ratio on the lateral stiffness, hysteretic behavior, energy dissipation capacity, ductility and bearing capacity of SPCW were analyzed by elasto-plastic finite element software. The results show that SPCW normal section bearing capacity changes along with axial compression ratio and reaches the maximum when the axial compression ratio is 0.4. SPCW has the maximum ductility and energy dissipation capacity when the axial compression ratio is in the range of 0.2 to 0.4. The deformation capacity, ductility and energy dissipation capacity decrease if the axial compression ratio exceeds 0.6. Meanwhile, axial compression ratio influences the initial lateral stiffness of SPCW. Lateral stiffness decreases with the cycles of reversed loading. To verify the reliability of the finite element analysis, a scaled compression-bending SPCW specimen test was carried out. The finite element analysis results agree well with the test results. While the normal section bearing capacities calculated by formula of JGJ 138-2012 'the code for design of composite structure' and the fiber finite element model are conservative. In order to ensure good seismic behaviors of SPCW, the axial compression ratio should not be too high. © 2016, Editorial Office of Journal of Building Structures. All right reserved.


Zhai X.,Harbin Institute of Technology | Gao S.,Harbin Institute of Technology | Gao S.,China Architecture Design & Research Group
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2015

In order to obtain the response characteristics of LNG (liquefied natural gas) containment tanks under wind load, an accurate model of a 160000 m3 LNG tank is established based on practical engineering. Finite element analysis via ANSYS is conducted considering static wind and along-wind vibration. Comparison is made between the Fourier series for wind pressure distribution of cylinders supposed by foreign scholars and shape coefficients for wind pressure distribution of circular section structures adopted by Chinese load code for the design of building structures. Wind pressure height coefficients are also compared between Chinese code and U.S code. It is proved that the coefficients adopted by Chinese load code are more adverse for the LNG tank. The results of deformation and stress in different wind directions are analyzed and reveals how wind directions affect the response of LNG tanks under wind load. The analysis of wind-induced response is carried out, adapting quasi-steady assumption and Davenport spectrum. The results show that under along-wind fluctuating wind load, the changing trend of deformation and stress is close to the result under static wind but the extreme response is twice. Compared to the response under other static loads, static wind load and along-wind fluctuating wind load have little influence on LNG tanks. ©, 2015, Editorial Board of Journal Harbin Institute of Technology. All right reserved.


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.


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.


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.


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.

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