CAJ | 학술논문

为深入研究部分斜拉桥的极限承载能力,以国内第1座已建混凝土部分斜拉桥--漳州战备大桥为例,对其进行极限承载能力分析.运用ANSYS有限元分析软件,采用基于非线性连续介质力学理论的全过程分析方法,假定混凝土为理想的弹塑性材料,采用Drucker-prager屈服准则,钢筋为多线性等向强化材料,采用Mises屈服准则,建立了有限元u.L.列式的几何非线性与材料非线性耦合空间分析模型.分析结果表明:当活载系数λ＜3时,部分斜拉桥结构的非线性特征不明显.部分斜拉桥达到极限承载力时,其破坏模式属材料强度达极限状态这种类型,此时结构还未出现极值点失稳现象.决定其极限承载力的主要因素是混凝土材料非线性.中跨布载时结构极限承载力最小,活载系数λ=7.8,极限安全系数k=1.78.
위심입연구부분사랍교적겁한승재능력,이국내제1좌이건혼응토부분사랍교--장주전비대교위례,대기진행겁한승재능력분석.운용ANSYS유한원분석연건,채용기우비선성련속개질역학이론적전과정분석방법,가정혼응토위이상적탄소성재료,채용Drucker-prager굴복준칙,강근위다선성등향강화재료,채용Mises굴복준칙,건립료유한원u.L.렬식적궤하비선성여재료비선성우합공간분석모형.분석결과표명:당활재계수λ＜3시,부분사랍교결구적비선성특정불명현.부분사랍교체도겁한승재력시,기파배모식속재료강도체겁한상태저충류형,차시결구환미출현겁치점실은현상.결정기겁한승재력적주요인소시혼응토재료비선성.중과포재시결구겁한승재력최소,활재계수λ=7.8,겁한안전계수k=1.78.
Partially cable-stayed bridge is a new kind of bridge lies in between continuous beam bridge and cablestayed bridge.Zhangzhou Combat Readiness Bridge,the first concrete partially cable-stayed bridge in China,was chosen to analyze the ultimate bearing capacity of partially cable-stayed bridge.The material of concrete and steel was supposed to be an ideal elastic-plastic material and multi-linear isotropic hardening material which adopt Drucker-prager and Mises yield criterion separately.The UL formula considering geometrical nonlinearity and material nonlinearity was used in finite element model by using ANSYS software and the full-range analysis method based on nonlinear continuum mechanics.The analyses indicate that (1) the nonlinear characteristic of partially cable-stayed bridge is not evident when the live load factor λ is less than 3;(2) the material strength exceeds the ultimate strength when the ultimate load bearing capacity of partially cable-stayed bridge is reached,and the destabilization phenomena does not appear;(3) the material nonlinearity of concrete is the main factor affecting the ultimate load bearing capacity of partially cable-stayed bridge;(4) the load bearing capacity is minimum when the load is disposed on midspan,and the live load factor λ is 7.8 and the ultimate safety factor k is 1.78.