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为了探究环氧沥青混凝土加铺层这种快速、有效的机场道面修建技术,利用ANSYS有限元程序,基于足尺多板体系,考虑了结构层之间不同的接触状态以及旧道面板之间的传荷能力,对复合道面结构层间受力状态进行了分析,结果表明:旧水泥混凝土道面板与基础之间的接触状况对加铺层弯沉影响略大,环氧沥青混凝土与旧水泥混凝土道面板之间的接触状况对复合道面结构应力指标影响明显,增强加铺层界面粘结强度能够改善复合道面结构受力状态,因此,在进行加铺层设计时要考虑选取合理的层间接触状态。 相似文献
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城区屋面雨水径流水文水质特征研究 总被引:5,自引:1,他引:4
研究城区屋面径流水文过程与污染物浓度变化特征,为有效利用城市雨水、控制非点源污染提供依据。通过体积法对新乡市城区屋面降雨径流进行采样,水质指标分析包括pH、SS、COD和DO。屋面径流系数为0.92~0.98间。研究结果表明:径流初期污染严重,后期COD、SS浓度分别在25 mg/L和30 mg/L以下。径流曲线形态与降雨过程线类似,两者波动幅度相对较小。径流中COD与SS之间的相关性较好,而DO与其之间的相关性较差。径流水质主要受降雨量、降雨强度、屋面材料、季节和气温等因素影响。 相似文献
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Liubing WANG ) Dunji YU ) Fei XUE ) Weiwei YU ) Jian CHEN ) Xu CHEN ) ) School of Chemical Engineering Technology Tianjin University Tianjin China ) Suzhou Nuclear Power Institute Suzhou China ) Key Laboratory of Efficient & Clean Energy Utilization College of Hunan Province Changsha University of Science Technology Changsha China 《金属学报(英文版)》2011,(2):101-108
Tests under mechanical strain control were performed to investigate the TMF behavior of Z2CND18.12N within the temperature range between 150–550 ? C. Different strain amplitudes and phase-angles were applied. Total strain controlled low cycle fatigue test was also performed at the peak temperature of TMF cycling. The results show that the cyclic stress response of the material displayed an initial hardening regime followed by a saturation period and then cyclic softening till failure. The TMF cycling leads to the development of significant amounts of mean stress. Some life prediction models were employed to predict the TMF life of Z2CND18.12N, and the results indicate that the energy-based models provide good prediction on the thermal-mechanical fatigue behaviors of this material. An optical microscopic observation shows that the surface crack initiations and crack propagations are typically transgranular mode. 相似文献
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In this work,we studied the effects of the discharge current,gas flow rate and vessel pressure on the electron temperature and density of Ar plasma by Langmuir probe measurement.The argon plasma was created by a one-cathode arc source.The experimental results show that with increasing discharge current and gas flow rate,the electron temperature and density increase.It is found that when the discharge current is 70 A,90 A and HO A at an argon flow rate of2000 seem,the electron densities at about 0.186 m distance from the nozzle are 13.00×10~(18) m~(-3),14.04×10~(18) m~(-3) and 15.62×10~(18) m~(-3),and the electron temperatures are 0.38 eV,0.58 eV and0.71 eV,respectively.The positive I-V characteristic is explained. 相似文献