不规则形状地下建筑结构设计与浅析

对形状不规则的地下建筑采用替代框架法、查弹性理论计算图表法这两种方法进行简化计算,并用SAP2000有限元分析方法进行计算,得到了成果数据,进行了简单的比较和分析,得出能否进行前述两种简化计算的初步结论。并且通过计算平面形状有不同转角的不规则形状地下建筑,得出了角度的变化和弯矩变化之间的关系。

结合工程实例全面探讨不规则形状地下建筑结构设计

在我国经济快速发展的影响下,城市现代化建设、人口增长与土地资源紧张之间的矛盾关系日益突出,为更好的满足现代社会的发展,城市地下空间建设已逐步成为目前空间开发的一项重点领域。然而,由于地下建筑结构复杂,受地形影响较为明显,因此为工程建设带来了一定的难度。针对该类问题,文章结合目前地下工程建设设计的重点内容,以不规则形状地下建筑结构设计为重点,对此进行全面论述,以供参考。

Needs of thermodynamic properties measurements and modeling in the frame of new regulations on refrigerants

In 1987, the Montreal Protocol prohibited the worldwide use and production of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) and hydro fluorocarbons (HFCs) were proposed as alternative refrigerants. Unfortunately, HFCs have non negligible global warning potential and therefore new refrigerants must be proposed or old refrigerants must be used associated with HFC. Accurate experimental thermodynamic data and predictive techniques are required for better under-standing of the performance of the newly proposed refrigerants. In this communication, experimental techniques based on either analytic or synthetic methods are first described. Data are reported. Then two newly developed predictive models based on thermodynamic approach with the isofugacity criterion and artificial neural network method are presented. The results can provide better evaluation of refrigerants, especially with the aim of studying global warning effects.