双曲网壳地震作用下的双参数破坏准则

Double-parameter Failure Criterion of Hyperboloid Reticular Shells Subjected to Earthquakes

考虑网格形式和高跨比的变化,用有限元软件ANSYS对多个单层双曲抛物面网壳算例进行地震时程分析。采用全过程动力响应分析方法研究其失效特点,利用建筑结构基于位移和能量的双参数破坏准则的模式,将结构最大位移与塑性累积耗能进行组合建立了动力强度破坏的双参数准则,以动力破坏指标判定结构的动力破坏程度。与原有网壳结构动力破坏准则相比,应用双参数准则和动力破坏指标可以更有效地评价单层双曲抛物面网壳在地震作用下的动力强度破坏程度。

By ANSYS,a full course dynamic response analysis method based on time-history calculation is performed to study the dynamic damage characteristic of single-layer hyperbolic paraboloid reticular shells subjected to earthquakes with different types and directions of seismic waves. The diversity of both grid form and height-span ratio of the shells is considered in the research. Based on numerical simulation results,a double-factor criterion of dynamical strength failure is constructed by combination of maximum displacement and total strain energy into dynamical failure index to quantify the different level of dynamical strength failure for single-layer hyperbolic paraboloid reticular shells. Compared with previous dynamical failure criterion,the double-factor criterion and dynamical failure index are more reasonable and effective. Furthermore,a correlation between dynamical failure index and limit displacement is achieved in a certain range.