CAJ | 학술논문

针对目前典型的混凝土T梁桥横向连接方式,在前期试验的基础上,对20 m标准跨径混凝土梁桥,采用和试验相同的建模方式,以数值模拟的方法研究了不同横隔梁损伤对混凝土梁式桥荷载横向分布及体系的影响.结果表明,在所有中横隔梁全部损伤以前,荷载横向分布影响线坐标变化率随着横隔梁损伤数量基本上按照线性规律变化;所有中横隔梁损伤以后,横向连接状态向翼缘连接状态急剧变化;只有当某片梁两侧的中横隔梁同时失效后,这片梁的荷载横向分布才退化到由翼缘连接决定的状态.在此基础上,提出了活载横向分布调整系数,并给出了确定原则和方法.在既有混凝土梁桥的检算评定中,可以适当的提高活载检算荷载效应,以反映桥梁实际承受荷载情况.
침대목전전형적혼응토T량교횡향련접방식,재전기시험적기출상,대20 m표준과경혼응토량교,채용화시험상동적건모방식,이수치모의적방법연구료불동횡격량손상대혼응토량식교하재횡향분포급체계적영향.결과표명,재소유중횡격량전부손상이전,하재횡향분포영향선좌표변화솔수착횡격량손상수량기본상안조선성규률변화;소유중횡격량손상이후,횡향련접상태향익연련접상태급극변화;지유당모편량량측적중횡격량동시실효후,저편량적하재횡향분포재퇴화도유익연련접결정적상태.재차기출상,제출료활재횡향분포조정계수,병급출료학정원칙화방법.재기유혼응토량교적검산평정중,가이괄당적제고활재검산하재효응,이반영교량실제승수하재정황.
The influence of damaged transverse connection on the prefabricated concrete T-beam bridges was studied by finite element analysis. One concrete model of 20 m T-beam bridge using welding steel plate was constructed. The impacts of different conditions to transverse load distribu-tion were discussed. Before the failure of all middle diaphragms, change of influence line coordi-nates was linear. After that, transverse connection changed sharply. Only when the middle dia-phragms at both sides all fail, was the transverse load distribution determined by the beam flange connection. On this basis, the live load adjustment coefficient and its determination principle were put forward, which could properly increase the influence of vehicle load during the assessment of bridges, and reflect the actual loads of the T-beam bridges.