论文部分内容阅读
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 performance of the dome structure, a rib-ring-type stiff support dome with a diameter of 6 m and an 8th ring was designed. The construction method of gradually expanding and elevating the center site assembly is adopted. The construction test and monitoring are carried out on the construction process with and without temporary support, and the construction forming analysis is carried out on the construction process. In 8 directions, 4 Direction and two directions of the symmetrical tension program to study; carried out full span and half-span static loading test, and with the finite element analysis of the results were compared. The results show that the proposed construction method takes full account of the characteristics of the stiff support dome structure and is simple and efficient and can be applied to the actual engineering. The finite element dynamic relaxation of internal force and node coordinates of the temporary support structure and the temporary support structure model FEDR) method is in good agreement with the experimental data. The difference between the experimental results of different tensioning methods and the calculated values of FEDR method is less than 7.8%, so an appropriate symmetrical tensioning scheme can be selected according to the requirements of practical engineering. Finite element analysis And static test results basically consistent.