School of Architecture and Art, Central South Univ, Changsha, Hunan, China
研究了地震发生时单桩摩阻力动力.为揭示摩擦桩与土体在考虑基本地震荷载作用下的耦合响应规律，采用拉格朗日数值分析方法建立桩与土体计算模型，通过施加地震荷载，分析桩周摩阻力、桩体轴力以及土体的变形在不同地震历时下的情况，得到：1)桩周负摩阻力从桩顶向下呈先增大后减小的态势，在桩长0.35倍范围内出现负摩阻力；2)由于地震荷载的作用，桩侧摩阻力和轴力均不断变化，当地震时间为3 s 时，桩侧摩阻力和轴力达到最大值；3)随着地震的持续进行，桩体和土体之间的相对位移的变化导致中性点位置发生往复变化；4)由于地震荷载的作用，土体的位移明显增大.在地震历时0~10 s 范围内，地表沉降迅速增大；在地震历时10~15 s 时，地震沉降增加的速度明显减慢；当地震历时持续到15~20 s 时，地表沉降逐渐减小.
Nature Environment and Pollution Technology,2016年15(3):1055-1063 ISSN：0972-6268
[Liu, Luyun] School of Civil Engineering, Central South University, Changsha, 410004, China;[Zheng, Bohong] School of Architecture and Art, Central South University, Changsha, 410004, China;[Zheng, Jian] School of Architecture, South China University of Technology, Guangzhou, 510006, China
School of Civil Engineering, Central South University, Changsha, China
CO 2 emissions;Low-carbon new town;Scenario simulation model;Stella model
New towns are the main source of CO<inf>2</inf>emissions. Stabilizing emissions of new towns have become an important issue due to rapid urbanization. In view of this, a System Dynamics model called the New Town CO<inf>2</inf>Emissions Model was developed to predict and assess the CO<inf>2</inf>emissions of spatial planning schemes. Based on the Xishan low carbon demonstration region, we proposed three schemes, which correspond to different land use dynamic variation simulation patterns for the targets of maximum economic benefit, minimum emissions and lower ecological impacts. In addition, we analysed the sensitivity of carbon emissions by changing the parameters of the model. The seven sets of parameters used, represent the seven different planning scenarios. Finally, we simulated the CO<inf>2</inf>dynamics data using the above model to compare the three schemes in terms of environmental impact, economic benefits and land use efficiency. The model can be used to predict and assess new town CO<inf>2</inf>emissions for all of China and may be applied to other developing countries.
[Xie, Ming-Jing; Wang, Hao] Cent S Univ, Sch Architecture & Art, Changsha, Hunan, Peoples R China.
International Conference on Energy Development and Environmental Protection (EDEP)
AUG 17-19, 2018
Nanjing, PEOPLES R CHINA
[Xie, Ming-Jing;Wang, Hao] Cent S Univ, Sch Architecture & Art, Changsha, Hunan, Peoples R China.
AER-Advances in Engineering Research
Traditional folk house;the south of Hunan;transitional space;ecological experience
We conducted a summer thermal environment test on a traditional folk house and a modern folk house in Banliang Village, south of Hunan. The result shows that the indoor temperature of the traditional folk house is 3 degrees C lower than that of the modern folk house. The temperature of the outdoor spaces, transitional spaces and bedrooms shows an obvious gradient descent. In the case that the temperature outside the wall is the same, the temperature of the inside surface of the traditional folk house's wall is 5 degrees C lower than that of the modern folk house. The result indicates that the transition space of the traditional folk house is conducive to lowering the indoor temperature of the living space in summer. The thick black brick wall's insulation performance is stronger than the hollow brick wall of the modern folk house. And the southward opening of the house is conducive to enhancing the indoor natural ventilation. The ecological experience of traditional folk houses is worth learning for modern folk houses.
[Luo, Xi] School of Architecture and Art, Central South University, Changsha, 410083, China;[Li, Yuqiang; Wang, Hongcai] School of Energy Science and Engineering, Central South University, Changsha, 410083, China
School of Architecture and Art, Central South University, Changsha, China