CAJ | 학술논문

综合利用ANSYS软件的“单元生死”及多步求解技术,建立精细化实体有限元模型,分析了某连续梁顶板拆除及修复过程中局部应力分布及变化规律。得出：顶板拆除后,剩余顶板纵横向应力普遍增加3 MPa左右,局部角点出现应力集中；顶板修复及加强后,由于二期恒载及活载的作用,老混凝土纵向应力会继续增加,而横向应力基本不会发生变化。在承受二期恒载及活载前后,最大主压应力及最大主拉应力改变不大,但结构局部应力集中点主压应力达到21.7 MPa,应引起注意。
종합이용ANSYS연건적“단원생사”급다보구해기술,건립정세화실체유한원모형,분석료모련속량정판탁제급수복과정중국부응력분포급변화규률。득출：정판탁제후,잉여정판종횡향응력보편증가3 MPa좌우,국부각점출현응력집중；정판수복급가강후,유우이기항재급활재적작용,로혼응토종향응력회계속증가,이횡향응력기본불회발생변화。재승수이기항재급활재전후,최대주압응력급최대주랍응력개변불대,단결구국부응력집중점주압응력체도21.7 MPa,응인기주의。
In this study, by comprehensively using the element birth and death technique as well as the multi-step solving technique of ANSYS software, a refined solid finite element model was established, and the local stress distribution and variation were analyzed for a certain continuous girder in the process of its top slab being crushed and restored. The results showed that: ( a) after part of crushed top slab were removed, the longitudinal stress and the transverse stress in the rest of the top slab were generally increased by 3 MPa or so, while the phenomenon of stress concentration occurred at the local corner points; ( b ) after repairing and strengthening the top slab, the longitudinal stress of older concrete continued to increase because of the action of the secondary permanent load and live load, while the transverse stress of older concrete was not changed basically;( c) before and after bearing the secondary permanent load and live load, both the maximum principal compressive stress and maximum tensile stress were little changed, but the maximum principal compressive stress at the stress concentration points of the structure had reached up to 21.7 MPa, which should be taken into account.