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国内异形结构的设计刚刚起步,以山西大同大剧院为工程背景,对结构设计过程中的一系列难点展开深入研究及分析,论证其大跨度异形壳体结构设计的合理性及可实施性。大同大剧院异形混凝土壳体形状如“山”字形,屋面波澜起伏,最大跨度约50m,厚度300mm。落地壳体、剧院框架、门厅内2个混凝土异形筒柱成为屋面壳体的主要竖向承重构件。对本项目做了风洞数值模拟试验以确定风荷载取值;利用ABAQUS有限元软件分析异形混凝土壳体的稳定性及罕遇地震作用下主要构件的性能指标;利用ANSYS有限元软件对大体积混凝土连续浇筑产生的收缩、徐变进行分析;利用MIDAS/Gen有限元软件分析异形混凝土壳体的温度应力及内力。上述分析有效地保证了结构的整体安全性。
The design of domestic special-shaped structure has just started. With the project of Datong Grand Theater in Shanxi Province as the engineering background, a series of difficulties in the structural design process have been studied and analyzed in depth. The rationality and feasibility of the structural design of long-span shaped housing have been demonstrated. Datong Grand Theater shaped concrete shell shape, such as “mountain ” shape, roof ups and downs, the maximum span of about 50m, thickness 300mm. The floor shell, the theater frame, and the two concrete shaped columns in the foyer are the main vertical load-bearing members of the roofing shell. The wind tunnel numerical simulation test was done to determine the wind load value. The ABAQUS finite element software was used to analyze the stability of the profiled concrete shell and the performance of the main components under the rare earthquakes. The finite element software ANSYS was used to simulate the mass concrete The shrinkage and creep caused by continuous pouring were analyzed. The temperature stress and internal force of profiled concrete shell were analyzed by MIDAS / Gen finite element software. The above analysis effectively guarantees the overall safety of the structure.