CAJ | 학술논문

为研究空间杆系结构鲁棒性及结构失效模式预测方法，将杆件关键系数引入应力变化率法用于结构失效模式预测和结构可靠度分析以考虑悬链线作用对杆件失效模式的影响。利用ANSYS数值模拟分析了静力阶跃荷载和竖向地震荷载作用下单层星型穹顶结构杆件失效模式，对比了考虑杆件关键系数前后应力变化率曲线。作为对比分析，应用有限元软件ALGOR分析了一种新型张弦桁架结构在7种局部构件损坏工况下剩余构件内力变化的敏感性系数，分析了结构可靠度的鲁棒性并同传统张弦桁架结构进行了对比。结果表明，考虑杆件关键系数后显著提高了临界破坏发生前若干荷载步的应力变化率，从而可利用该方法在结构失效前进行预警。通过改变下弦拉索的数量和布置方式可有效降低其对构件内力变化敏感性的影响，从而有效提高结构可靠度。在断索工况下，该高冗余度张弦桁架结构可提高结构抗连续性倒塌能力，延长结构从局部破坏到全部倒塌的过程，增加了结构安全储备，增强了结构抵抗灾变荷载的能力。
위연구공간간계결구로봉성급결구실효모식예측방법，장간건관건계수인입응력변화솔법용우결구실효모식예측화결구가고도분석이고필현련선작용대간건실효모식적영향。이용ANSYS수치모의분석료정력계약하재화수향지진하재작용하단층성형궁정결구간건실효모식，대비료고필간건관건계수전후응력변화솔곡선。작위대비분석，응용유한원연건ALGOR분석료일충신형장현항가결구재7충국부구건손배공황하잉여구건내력변화적민감성계수，분석료결구가고도적로봉성병동전통장현항가결구진행료대비。결과표명，고필간건관건계수후현저제고료림계파배발생전약간하재보적응력변화솔，종이가이용해방법재결구실효전진행예경。통과개변하현랍색적수량화포치방식가유효강저기대구건내력변화민감성적영향，종이유효제고결구가고도。재단색공황하，해고용여도장현항가결구가제고결구항련속성도탑능력，연장결구종국부파배도전부도탑적과정，증가료결구안전저비，증강료결구저항재변하재적능력。
In order to study the robustness of spatial truss structures and the prediction method of structural failure models,the member key coefficien was introduced into the stress rate method considering structural catenary curve effects on element's failure models to predict structural failure models and to analyze structural reliability.A single layer star dome's structural failure model was analyzed using ANSYS and comparing the curves of stress rate with the classical and improved stress rate methods under static step load and vertical seismic loads.As a contrast analysis,the finite element analysis software ALGOR was applied to analyze a new type of truss string structure,its structural sensitivity coefficient was computed under 7 partial failure conditions,the structural robustness was analyzed and compared with that of a traditional truss string structure.The results showed that the stress rate before the structural critical failure significantly increases after considering the member key coefficient,so this method can be used to predict structural failure;by changing the numbers and location arrangement of cables,the structural failure sensitivity is significantly reduced and the structural reliability is greatly improved;under broken cable conditions,the resisting ability against progressive collapse of the new type truss string structure is improved and the process from partial damage to full collapse is prolonged,the structure safety is improved and the structural capability to resist disaster loads is enhanced.