组合网壳屋盖结构风振响应分析及等效静风荷载

结合惠州会议展览中心风洞试验结果,对波浪形组合网壳结构的风荷载和风振响应进行了分析,包括：24个风向角下屋盖荷载分布特性分析;结构整体和局部的自振特性分析;根据风洞试验结果对6个风向角（0°、30°、45°、90°、135°和180°）进行结构的风致动力响应分析。根据风振响应分析结果,基于响应的不同振动特点,提出将屋盖结构分为独立屋盖结构、屋盖结构两端挑棚结构和整体屋盖结构3个部分,指出对这3部分最不利的风向角分别为0°、30°、90°。最后综合考虑各个风向角下结构的响应及风振系数,给出了最终的风振系数建议值。     

近百年全球地表月气温数据的概况与初步整合

基于国际上最著名的4套全球地表月气温数据集,即英国东安格利亚大学气候研究所数据集（CRUTEM3）、美国国家气候数据中心数据集（GHCN-V3）、美国国家航天航空局数据集（GISSTMP）和Berkeley地球表面气温数据集,从分析现有资源的状况入手,通过广泛的国际调研与合作,整合了这4套全球地表逐月气温数据集和一些主要国家或地区的区域数据集,研发了中国第一套全球陆地表面逐月气温站点数据集。该数据集共包含全球9519站、7073站及6587站的月平均气温、最高及最低气温（序列长度不低于20年）数据,同CRUTEM3和GHCN-V3数据集相比,该数据集站点密度在各个区域都有所增加,尤其是在南美洲、非洲及亚洲地区;另外,1990年代以来的站点数量显著增加,有利于降低自1990年以来全球气温变化趋势估计的不确定性。     

1900-2009年中国均一化逐月降水数据集研制(英文)

Based on the collection and processing of the China national-wide monthly station observational precipitation data in 1900-2009,the data series for each station has been tested for their homogeneity with the Standard Normalized Homogeneity Test(SNHT) method and the inhomogeneous parts of the series are adjusted or corrected.Based on the data,the precipitation anomalies during 1900-2009 and the climatology normals during 1971-2000 have been transformed into the grid boxes at 5°×5° and 2°×2° resolutions respectively.And two grid form datasets are constructed by combining the normal and anomalies.After that,the missing values for the 5°×5° grid dataset are interpolated by Empirical Orthogonal Function(EOF) techniques.With the datasets of different resolutions,the precipitation change series during 1900-2009 over China's mainland are built,and the annual and seasonal precipitation trends for the recent 110 years are analyzed.The result indicates that the annual precipitation shows a slight dryer trend during the past 110 years,notwithstanding lack of statistical confidence.It is worth noting that after the interpolation of the missing values,the annual precipitation amounts in the early 1900s become less,which increases the changing trend of the annual precipitation in China for the whole 110 years slightly(from-7.48 mm/100a to-6.48 mm/100a).