立体桁架结构敏感性分析及抗连续倒塌性能

来源期刊:中南大学学报(自然科学版)2017年第12期

论文作者:徐颖 韩庆华 傅本钊

文章页码:3293 - 3301

关键词:立体桁架;连续倒塌;敏感构件;关键构件;重要性系数

Key words:spatial truss; progressive collapse; sensitive component; key component; importance coefficient

摘    要:采用ABAQUS动力隐式分析方法,考虑压杆屈曲的影响,对立体桁架结构进行敏感性分析,得到极端荷载作用下结构的连续倒塌破坏模式以及敏感构件、关键构件的分布规律,分析高跨比、跨度和截面形式对立体桁架抗连续倒塌性能的影响。研究结果表明:倒三角截面立体桁架敏感构件为支座附近的上弦杆、A类腹杆和B类腹杆;正三角截面立体桁架敏感构件为跨中下弦杆和支座附近的A类和B类腹杆。关键构件均为支座附近A类腹杆,通过增大关键构件的截面外径,可以有效提高结构的抗连续倒塌性能。在保证相同应力比的情况下,随结构高跨比增加或跨度减少,相同位置杆件的敏感性指标增加,敏感构件分布范围增大。

Abstract: ABAQUS dynamics implicit algorithm was used and compressive bucking was considered in the sensitivity analysis of the spatial truss structure. The progressive collapse modes subjected to extreme load and the distribution pattern of sensitive components and key components were acquired. Moreover, effects of the height-span ratio, structural span and its cross-section form on the progressive collapse performance of spatial trusses were also analyzed. The results indicate that the sensitive components of structures with inverted triangular cross-section are upper chord members and web members (A-type and B-type) at end-span, while the sensitive components of structures with positive triangular cross-section form are lower chord members at mid-span and web members (A-type and B-type) at end-span. Key components are the A-type web members near the supports; the progressive collapse performance of the structure can be improved effectively by increasing the sectional specification of key components. With the increase of the height-span ratio and the decrease of the structural span, the sensitivity index at the same position and the distribution range of sensitive components increase both increase in spatial trusses with the same stress ratio.

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