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长春市老年大学建筑场地在长轴方向高差达8m,给建筑的基坑降水及抗浮设计带来了较大的困难。由于建筑功能的需要,楼板大开洞较多并沿竖向贯通,形成平面不规则项超限。同时为满足建筑师的创意,西侧入口整体向内凹入,在顶部形成宽度17m、跨度50m的挑空檐口。该檐口采用钢管桁架体系,既减轻了结构自重,又能避免自重过大造成的作用于主体结构的较大水平地震作用。由于整体桁架位于室外且没有采暖,温度应力比较突出,支座采用变形能力较好的成品滑动铰支座。整体桁架采用MIDAS/Gen进行内力分析,关键节点采用ANSYS进行补充应力分析。
The construction site of the senior citizen in Changchun City has a height difference of 8m in the long axis direction, which brings great difficulties to the foundation pit dewatering and anti-floating design of the building. Due to the needs of the building function, the floor slab hole more and along the vertical through, forming a plane irregularities overrun. At the same time, in order to meet the architect’s creative ideas, the entrance on the west side is inwardly concave as a whole, forming a cornice with a width of 17m and a span of 50m at the top. The eaves using steel truss system, not only reduce the weight of the structure, but also to avoid excessive weight caused by the main structure of the larger horizontal seismic effect. As the overall truss is located outdoors and no heating, the temperature stress is more prominent, the use of deformation bearing capacity of the finished sliding hinged seat. The internal truss adopts MIDAS / Gen for internal force analysis, and the key nodes are supplemented with ANSYS stress analysis.