CAJ | 학술논문

为分析空间杆系结构的易损性,将日本钢结构协会建议的结构敏感性指标改进为体现移除杆件影响的单元敏感性指标。利用有限元软件ALGOR,计算平面梯形桁架在5种杆件移除工况下剩余杆件的敏感性指标,检验利用单元敏感性指标法判断杆件移除顺序和识别结构倒塌模态的可行性。将单元敏感性指标法用于张弦桁架结构易损性分析,研究双索张弦桁架结构在不同工况下剩余杆件的单元敏感性指标和结构竖向位移,阐述冗余索降低张弦桁架结构易损性的作用机理,通过有限元软件ANSYS,对构件敏感性指标进行数值计算,分析双索张弦桁架结构动力破坏模态和连续倒塌特性。结果表明,单元敏感性指标法适用于空间杆系结构易损性分析；冗余索和X型支撑杆的设计方法可增加结构冗余度,降低动力荷载作用下杆件敏感性指标和结构易损性,增强结构抗连续倒塌能力；验证了利用单元敏感性指标法分析杆系结构易损性的可行性。
위분석공간간계결구적역손성,장일본강결구협회건의적결구민감성지표개진위체현이제간건영향적단원민감성지표。이용유한원연건ALGOR,계산평면제형항가재5충간건이제공황하잉여간건적민감성지표,검험이용단원민감성지표법판단간건이제순서화식별결구도탑모태적가행성。장단원민감성지표법용우장현항가결구역손성분석,연구쌍색장현항가결구재불동공황하잉여간건적단원민감성지표화결구수향위이,천술용여색강저장현항가결구역손성적작용궤리,통과유한원연건ANSYS,대구건민감성지표진행수치계산,분석쌍색장현항가결구동력파배모태화련속도탑특성。결과표명,단원민감성지표법괄용우공간간계결구역손성분석；용여색화X형지탱간적설계방법가증가결구용여도,강저동력하재작용하간건민감성지표화결구역손성,증강결구항련속도탑능력；험증료이용단원민감성지표법분석간계결구역손성적가행성。
To analyze the vulnerability of truss structure, the structural sensitivity index suggested by the Japan Steel Construction Society was replaced by a member sensitivity index for reflecting the influences of removing bars. The member sensitivity index of a trapezoid truss in two dimensions was calculated by finite element software ALGOR un-der five working conditions of removing bars. The feasibility of member sensitivity index method was validated in de-termining the destroyed sequences of structural members and identifying the mode of structural collapse. Vulnerabili-ty analysis of truss structure was conducted by using the member sensitivity index method, structural member sensi-tivity indexes of remained bars. The structural vertical displacements under different working conditions of truss string structure with double cables were analyzed to illustrate the mechanism of vulnerability changes of truss string structure with the help of redundant cable. A dynamic progressive collapse characteristic analysis of truss string structure with double cables was carried out by the member sensitivity index method through finite element software ANSYS, by which the dynamic failure mode and progressive collapse characteristic of truss string structure with double cables were obtained. The results show that the member sensitivity index method is effective in analyzing vulnerability of spatial truss structure. The structural redundancy degree is increased by setting redundant cable and X-type supporting bars, which decrease member sensitivity index and structural vulnerability and enhance structural anti-progressive collapse ability under dynamic loads. The member sensitivity index method is verified to be feasible in analyzing vulnerability of truss structure.