钢筋砼结构抗火性能研究现状与展望

火灾产生的高温可使建筑结构严重破坏甚至倒塌,为了保证建筑结构具有足够的抗火能力,必须进行建筑结构的抗火分析和设计。总结了目前国内外钢筋砼结构抗火性能研究的现状,包括国内外抗火试验研究现状、温度场计算、构件承载力计算以及建筑结构抗火性能应用软件研究等,并对今后的研究方向进行了展望。     

买房之选房技巧探讨

围绕消费者买房之选房技巧，从怎样选择户型、健康住宅标准、如何看房屋设计图纸、购房如何看房屋质置、挑选房子的标准、选房要素等进行探讨，以保证购到满意住房。     

钢结构在低温下脆性破坏的研究

简要介绍国外在低温冷脆现象领域理论和实验研究的历史、现状和前景，并结合我国自然气候环境、钢结构应用现状及现行钢结构规范阐述了在我国从事该领域研究的必要性。     

散体结构岩质高边坡的开挖参数研究

目前,岩石边坡开挖参数选择多采用工程地质比拟法。使用现行的工程地质比拟法确定边坡开挖的参数,很大程度上取决于使用者的工作经验和新设计边坡与参考表所列边坡的可比性,缺乏理论依据,所设计出的开挖边坡不是过分偏于安全,就是边坡产生局部和整体失稳,发生破坏。为此,针对散体结构岩质边坡,从理论分析的角度出发,通过对几种常用参数的边坡开挖进行数值模拟,比较各种台阶坡比、台阶平台宽度、台阶高度下的边坡开挖的位移应力变化,充分考虑了边坡经开挖后的稳定性和经济性,提出了针对散体结构岩质高边坡的优化开挖参数,为边坡开挖提供理论依据,对工程实践起着重要的指导作用。     

历史与自然的交织——创造独特风格的景观环境

文章从具体的项目分析出发,结合历史因素与自然因素,探讨了如何创造独特风格的景观环境,以及如何把握好历史与自然的关系,处理好人与环境的关系等问题。     

校园环境的人文气息——南安一中校园中心环境设计

文章结合南安一中的修建性规划,阐述如何在规划过程中结合校园原有建筑的布局,划分合理的功能区;通过对校园环境的塑造,融合新旧建筑的差异,力争营造出具有传统园林特点的,富有人文气息的现代气质的学校。     

Seismic response of liquid-filled elevated tanks

The main focus of the current study is to evaluate the performance of elevated tanks under seismic loading. In this study, the finite element (FE) technique is used to investigate the seismic response of liquid-filled tanks. The fluid domain is modeled using displacement-based fluid elements. Both time history and modal analyses are performed on an elevated tank. Using the FE technique, impulsive and convective response components are obtained separately. Furthermore, the effect of tank wall flexibility and sloshing of the water free surface are accounted for in the FE analysis. In this study complexities associated with modeling of the conical shaped tanks are discussed. This study shows that the proposed finite element technique is capable of accounting for the fluid-structure interaction in liquid containing structures. Using this method, the study of liquid sloshing effects in tanks with complex geometries such as conical tanks is made possible. The results of this study show that the current practice predicts the response of elevated tanks with reasonable accuracy.     

Contribution of marine and continental aerosols to the content of major ions in the precipitation of the central Mediterranean

The region of the investigated receptor is situated in the southern part of the Adriatic Sea in the Mediterranean. The measuring station is located on the seashore, which, being considered as a border area, is representative for the qualitative and quantitative estimation of the influence of marine and continental aerosols on the content of major ions in precipitation. In the sampling period, precipitation in the region of the investigated receptor was more abundant during the summer and autumn than during the winter and spring. The most frequent precipitation heights were up to 20 mm, while high precipitation came exclusively from the continental region. The results of the measurements of ions readily soluble in water were used for the differentiation of marine from continental contributions of primary and secondary aerosols to their content in the precipitation. Using PCA, it was shown that main contribution of Cl(-), Na(+) and Mg(2+) came from primary marine aerosols, while the contribution from continental sources was dominant for the content of SO(4)(2-), NO(3)(-), NH(4)(+) and Ca(2+) in the precipitation. The continental origin of Ca(2+) was from a primary source, while SO(4)(2-), NO(3)(-) and NH(4)(+) were representatives of secondary aerosols produced by reactions between acid oxides and alkaline species in the atmosphere, but SO(4)(2-) and NO(3)(-) also exist in the precipitation as free acids. The origin of the trace elements Cd, Cu, Pb and Zn in the precipitation came from anthropogenic emission sources. The results obtained in this work are based on experimental data from 609 samples collected during the period 1995-2000.     

四面体有限单元覆盖的三维数值流形方法

构造三维流形单元的覆盖函数和总体位移函数，基于最小势能原理建立四面体有限单元覆盖的三维数值流形方法分析格式，详细推导了三维流形单元的刚度矩阵、初应力矩阵、荷载矩阵、惯性矩阵、位移约束矩阵和接触矩阵，并给出了相应的公式和算例。     

城市公园景观要素的微气候相关性分析

在园林微气候设计中,需要根据环境要素量化分析影响微气候的关键气候参数和改善微气候的适宜景观要素。以成都市百花潭公园为例,选取7个观测点,实测其气温、风速、相对湿度、太阳辐射照度等微气候参数,利用实测数据客观评估观测点的热舒适度。在此基础上,量化分析观测点微气候参数与热舒适度的相关性、微气候参数之间的相关性。研究结果表明:湿热气候区影响园林微气候舒适性的关键气候参数是风速和太阳辐射照度;水体和植物是改善高温、高湿气候相对更适宜的景观要素,水体的微气候效应优于植物。研究内容和结果为湿热气候区优化园林气候提供新的研究思路和技术方法,促进园林健康气候建设。