考虑下部支承条件下网壳结构性能分析

Performance Analysis of Latticed Shell with Sub-supporting Structure

为了考察支承结构刚度对网壳结构性能的影响,以不考虑下部支承及考虑下部支承的单层球面网壳为研究对象,利用ANSYS结构分析软件,建立跨度40 m、矢跨比为1/5的K8型单层球面网壳,通过改变网壳结构支承结构截面尺寸,对不考虑下部支承及考虑下部支承结构下网壳结构挠度、轴力及自振频率进行对比分析.研究表明,支承结构截面尺寸越大,网壳结构挠度越小;对于网壳结构的杆件,支承结构截面尺寸的改变对肋杆的影响最大,对环向杆件的影响最小;对于网壳结构的频率,支承结构截面尺寸的改变对前3阶影响较大.

In order to check how the stiffnes of bearing structure impact performance of latticed shell,we use two kinds of single-layered sphere shell as researching object,one with bottom support,another without bottom support. Then the ANSYS software is used to set up a K8 sphere with 40 m span,1 /5 rise-span ratio,aiming to analyze axial force,frequency and deflection of the sphere by changing section size. The researching result shows that the larger section size,the less the deflection. As to the effect on the ribs of the shell structure,it turns out the change of section seize has great influence on the rib rod but less effect on annular member of the structure.In addition,the influence on frequency turns to be obvious in the first three stages.