昆明长水国际机场T2航站楼结构设计关键问题探讨

Discussion on key issues of structural design of Kunming Changshui International Airport Terminal 2

昆明长水国际机场T2航站楼面临高填方边坡、高抗震设防烈度、高铁下穿等多项复杂条件,给结构设计带来诸多挑战。在简单介绍T2航站楼结构体系基础上,从场地、隔震、振动控制和钢屋盖等四个方面对结构设计的关键问题进行了探讨,并给出了解决问题的途径。得出如下结论:复杂场地条件下的地震动参数应通过三维建模条件下的场地地震反应分析确定;高填方边坡在地震下的稳定性应结合拟静力法和时程分析法进行分析;不等标高基底隔震时,隔震层层间位移角限值应以控制罕遇地震下的支座变形为目标来确定;超长结构隔震应采取措施缓解混凝土收缩和温度效应对隔震支座变形的影响;混合使用不同竖向频率的隔振支座解决高铁运行导致的结构振动是可行的;树形柱分枝角度对柱的受力效率影响明显;与大跨屋盖相连的单索幕墙结构可通过自平衡方式减小索拉力对屋盖的作用。

Kunming Changshui International Airport Terminal T2 is faced with many complex conditions,such as high fill slope,high seismic fortification intensity,high-speed railway underpasses and so on,which bring many challenges to the structural design.Based on a brief introduction to the structural system of Terminal 2,the key issues of structural design were discussed from four aspects of site,seismic isolation,vibration control and steel roof,and the ways to solve the problems were given.The following conclusion can be drawn:the seismic parameters under complex site conditions should be determined through seismic response analysis of the site under three-dimensional modeling conditions.The stability of high fill slopes under earthquakes should be analyzed by using the quasi-static method and time history analysis method.When using unequal elevation base isolation,the limit value of displacement angle between isolation layers should be determined with the goal of controlling the deformation of bearings under rare earthquakes.Measures should be taken to alleviate the effects of concrete shrinkage and temperature effects on the deformation of isolation bearings for super-long structures.It is feasible to use a mixture of vibration isolation supports with different vertical frequencies to solve the structural vibration caused by high-speed rail operation.The branching angle of tree shaped columns has a significant impact on the stress efficiency of the columns.The single cable curtain wall structure connected to the large-span roof can reduce the effect of tension on the roof through self-balancing.