CAJ | 학술논문

为研究网架结构杆件安装应力的分布特征，对跨度为4、5、6m各3个，共9个网架模型进行了安装应力试验测量。为说明安装应力对网架极限承载力的影响，对跨度6m的试验模型进行了极限承载力试验，并将结果与基于理想弹塑性、马歇尔压杆模型的A baqus非线性分析结果进行了对比。安装应力测量结果表明：少数杆件安装应力接近甚至超过稳定应力。承载力对比表明：试验承载力比理论承载力下降了17．9％，结构安全储备仅为1．25。安装应力通过破坏结构原有对称性、产生杆件初弯曲、促使压杆提前失稳等方式影响网架结构性能，危害网架结构的安全。网架设计特别是满应力设计应当充分考虑安装应力的不利影响。
위연구망가결구간건안장응력적분포특정，대과도위4、5、6m각3개，공9개망가모형진행료안장응력시험측량。위설명안장응력대망가겁한승재력적영향，대과도6m적시험모형진행료겁한승재력시험，병장결과여기우이상탄소성、마헐이압간모형적A baqus비선성분석결과진행료대비。안장응력측량결과표명：소수간건안장응력접근심지초과은정응력。승재력대비표명：시험승재력비이론승재력하강료17．9％，결구안전저비부위1．25。안장응력통과파배결구원유대칭성、산생간건초만곡、촉사압간제전실은등방식영향망가결구성능，위해망가결구적안전。망가설계특별시만응력설계응당충분고필안장응력적불리영향。
To reveal distribution characteristics of member initial stresses ,nine experimental prototypes in span of 4 m ,5 m and 6 m were employed .To analyze effects of member initial stresses on ultimate capacity of space truss ,a prototype in span of 6m was applied .Meanwhile ,the results were compared with those of Abaqus nonlinear FEM which were based on elastic-perfectly plastic model and Marshall Mode .Initial stress test show s that some initial stresses approach or even exceed stability stress .It is show n that the test ultimate capacity decreases by 17 .9% than that of Marshall Mode ,and the safety margin of structure is just 1 .25 .The impact mechanism of member initial stress consists in damaging structure initial symmetry , producing member initial bending and prompting press member buckling in advance .Member initial stress must be taken into account w hen space truss design ,especially Fully-Stress design ,is conducted .