Frontiers of Green Building, Materials and Civil Engineering

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Authors: Yong Tao Gao, Xiao Hu
Abstract: Due to the applicable installation height, small mass, flexible characteristic, large span, so the unit glass curtain wall (UGCW) could be differ from the glass curtain wall of frame members. Based on the characteristic of UGCW, analysis the load of UGCW and building the formula of static wind load, Earthquake Action, Temperature Function etc. The formula to calculate the load of the unit glass curtain wall (UGCW) is given on the base of analyzing the acting load and the mechanism of force transfer of the UGCW in service condition. Hope to provide some reference for similar designs.
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Authors: Yong Tao Gao, Xiao Hu
Abstract: The formula to calculate the stability of the unit glass curtain wall (UGCW) is given on the theory of the structure stability is applied to analyze the whole stability of the frame of the UGCW and the calculation formula is provided. Due to the special structure form of the vertical column of the UGCW the formula is given to calculate the critical moment of the vertical column when torsional and flexural buckling occur, and then, the design basis is provided for reasonable and safe design of the UGCW.
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Authors: Quan Sheng Sun, Jia Wei Wang
Abstract: Single Column shaped bridge is often used as a city program, it has the separate grade crossing, and multi-entry multi-exit, and greater clearance under the bridge, etc. But its stress situation is more complex, for designers and construction workers, put forward higher requirements. This article embarks from the stress of single Column shaped bridge, comparative analysis shaped bridge and curved bridge, concreting continuous beam bridge differences and similarities, and proposes the support way to the heterogeneous bridge's influence. Based on the single column bridge study, we find a simplified method on modeling, and its accuracy is in line with requirements of project. Finally, analyzes of the actual bridge, verifies the correctness of the calculation method, and proposes the key technologies.
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Authors: Biao Ma, Jun Ma, Da Long Wang, Shui Gen Peng
Abstract: Mixing the phase change material (PCM) into asphalt mixture could change the thermo physical properties of asphalt mixture. Asphalt mixture with PCM can remain in the ideal working temperature range for a relatively long time. However, the PCM easily leaks from asphalt mixture in the process of using. To solve this problem, the carrier-adsorbed packing method is applied to modify PCM in this paper. Different carriers and packaging materials are used to prepare three kinds of composite shape-stabilized phase change energy storage material (CPCM). Their microscopic characteristics and thermo physical properties are analyzed by scanning electron microscope and differential scanning calorimetry, respectively. The results show that the gel of silicon incompletely packed the macropores of activated carbon and the clustered silica, and the ethyl cellulose completely coated the clustered silica whose particle size increases and particle surface forms a compacted thin film. The phase transition temperature and latent heat of CPCM with silica are higher than CPCM with activated carbon. The PCM absorption of silica is greater than the PCM absorption of activated carbon. The mass fraction of CPCM packed by the EC is larger than the CPCM packed by the gel-sol method. The results indicate that the carrier-adsorbed packing method can effectively solve the problem of PCM leaking from asphalt mixture. The CPCM prepared with silica and ethyl cellulose is the most suitable for asphalt mixture.
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Authors: Ling Li Song, Ren Yuan Zhang, Ling Bo Mao, Wen Jie Zhu, Miao Yan Zheng
Abstract: The influences of dispersant type, supersonic time and concentration on the dispersion property of the nano-aluminium powders in glycol water were systematically studied by using Sodium dodecyl sulfate (SDS),cetyl trimethyl ammonium bromide (CTAB) and sodium hexa metah posphate(SHMP)as dispersants. During the first stage of the experiments, influences of dispersant type and ultrasonic time with these dispersants were evaluated. The next stage of the study was focused on SHMP concentration. The influence of SHMP concentration was assessed. The results show that with the increasing of ultrasonic time, the dispersion property of nano-aluminum powders first increases and then decreases, and SHMP is the best one. The excellent dispersing condition on the dispersion property of nano-aluminium is: 5g/L SHMP and 50 min ultrasonic vibration.
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Authors: Guo Xing Chen, Hua Pan
Abstract: With the fast development of rail rapid transit, stability and deformation control of subgrade are attached much more importance,meanwhile, researches on the liquefaction and post-liquefaction characteristic of sand and sand-gravel composites come to be very significative. The saturated Nanjing fine sand and sand-gravel composites samples were liquefied under the earthquake loadings simulated by the Hollow cylinder apparatus of GDS, after that, the post-liquefaction samples were subjected to stationary loading. This research is mainly concentrated on the characteristics of stress-strain relation of the two materials. It is found that the stress-strain responses are composed of three stages, including the low intensive strength stage, the superlinear strength recovery stage and the sublinear strength recovery stage. The comparison results of the behaviour of large post-liquefaction deformation between saturated sand-gravel composites and Nanjing fine sand showed : the low intensive strength stage and the superlinear strength recovery stage of saturated sand-gravel composites are shorter while the sublinear strength recovery stage is longer. Based on the tests results, a stress-strain model was established respectively according to Nanjing fine sand and sand-gravel composites , in which the initial confining pressure and the relative density can be considered synthetically. And it was found that the predicted results by the models proposed in this paper were in good agreement with experimental datas.
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Authors: Bing Yu Pan, Ji Peng Liu
Abstract: Through the investigation and analysis, on the basis of the top 10 evaluation index system, we have established a green residential area assessment and evaluation model. From two aspects of partial and comprehensive evaluation, we carries on the reasonable appraisal to planning and design quality and green residential area, so as to promote the healthy development of our green residential area.
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Authors: Ling Zhao, Guang Yu She
Abstract: The free vibration experiments for the NOPD frame structure were performed to investigate the dynamic characteristics of the frame. The influences of factors such as particle filling ratio, particle filling scheme and vibration direction of the frame on the damping effect are discussed by means of test data. Test results indicate that the particle filling ratio is a principal influencing factor for the damping effect of the frame. Under the same particle filling scheme and filling ratio, the damping increments for out plane vibration of the frame with smaller structural rigidity are normally larger than those for in plane vibration with larger structural rigidity. Within the three schemes of particle filling, the most prominent damping improvement exists in the particle-in-beam scheme under the same filling ratio and the corresponding maximum damping increment reaches 218% for out plane vibration. To obtain the most significant particle damping effect, the most effective scheme of particle filling is to put particles into the cavities of components with large vibration displacement.
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Authors: Wen Ge Hao, Yan Li, Meng Cheng Li
Abstract: In order to assess thermal insulating properties of exterior windows of building objectively, a detection device for thermal insulating properties of windows was designed scientifically according to the requirement of national standard. The design plan of detection device was introduced. The detection principle of the device and the calibration method of the system were discussed, and the error analysis for the result was also made. Accurate quantitative-detection of thermal insulating properties of exterior windows of building has been achieved, which provides an important technical safeguard for energy saving of building.
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Authors: Sha Sha Fu, Xin Fa Xu, Rong Fang Li, Pei Dong Tai
Abstract: A hydroponic culture experiment was conducted to study the effect of temperature and nutrient level on Cd accumulation in Tagetes erecta L.. In the first experiment, shoot Cd accumulation and transpiration rate at different temperature was determined. Cd accumulation was lower with higher transpiration rate at 35°C than that of 25°C or 15°C with lower transpiration rate. In the other experiment, cadmium accumulation of plants varies significantly under the condition of different nutrient supplication. Contents of Cd in roots were not high, but the contents of Cd in shoots were the highest when plants were cultivated in 0.05-fold Hoagland’s solution. Roots Cd accumulation decreased as the concentration of single nutrient element (N, P, S) decrease or absence, and shoots Cd accumulation decrease in the condition of sulfur deficiency and sulfur absence. It was shown that transpiration is not the primary factor affecting Cd accumulation in Tagetes erecta L, but growth rate of plants has certain correlation with Cd accumulation; contents of Cd in roots are most affected by the supplication of nutrient elements, yet shoots accumulation is relatively lagging behind; different nutrient element has some different effect on Cd accumulation, and the effects of nitrogen and sulfur on the shoots Cd accumulation are the greatest.
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