劲性支撑穹顶结构施工成形及力学性能试验研究

Construction forming and mechanical properties test of rigid bracing dome

为研究劲性支撑穹顶结构的施工方法及力学性能,设计了直径为6 m环向8等分的肋环型劲性支撑穹顶结构模型。采用中心场地拼装逐步张拉提升的施工方法,分别对有临时支撑和无临时支撑两种情况下结构的施工成形过程进行施工试验和监测,并对其进行施工成形分析;对8个方向、4个方向和2个方向的对称张拉方案进行研究;进行了满跨和半跨的静力加载试验,并与有限元分析结果进行对比。结果表明:提出的施工方法充分考虑了劲性支撑穹顶结构的特点,简单高效,可应用于实际工程;设临时支撑和不设临时支撑结构模型的杆件内力和节点坐标的有限元动力松弛(FEDR)法计算结果和试验值吻合较好;不同张拉方案试验值和FEDR法计算值相差均在7.8%以内,因此可依据实际工程的需要,选取适当的对称张拉方案;有限元分析结果与静力试验结果基本吻合。

In order to study the construction method and mechanical properties of rigid bracing dome,Geiger rigid bracing dome with 6 m of diameter was designed. Construction method is the lever assembly in the center of site and tension gradually upgrade. Test model was studied for two cases of temporary support and no temporary support.Construction forming analysis of model test was carried out. Construction tensioning method was studied for eight directions or four directions or two directions symmetric stretching. Mechanical properties of structure were studied at full-span load or half-span load. The experimental results were compared with the finite element analysis results. The results show that construction method takes full account of structure features of rigid bracing dome,is simple and efficient,and can be applied to practical engineering. The FEDR results of member internal force and joint coordinates are in good agreement with the experimental values. Structure of temporary support and no temporary support can use this construction method. Because the deviations of experimental values and FEDR method values of different tensile test schemes are within 7. 8%,according to the needs of practical engineering,appropriate symmetric stretching can be selected. The finite element analysis results are in good agreement with the static test results.