预应力混凝土曲线桥极限承载能力分析  

STUDY ON THE ULTIMATE LOAD CAPACITY OF PRESTRESSED CONCRETE CURVED BRIDGE

作　　者：汪劲丰[1] 吴光宇[2] 林泉[1,3] 项贻强 徐兴[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310027 [2]南昌大学建筑设计研究院,江西南昌310029 [3]温州市建设工程质量监督站,浙江温州325000

出　　处：《工程力学》2008年第8期85-91,共7页Engineering Mechanics

摘　　要：针对梁段法难以客观分析预应力混凝土(P.C.)曲线桥梁极限承载能力的问题,提出采用实体退化单元的三维分析方法。基于经典的三维实体等参元和梁、板壳等理论,提出了新型实体退化单元,建立了用于钢筋模拟的三维弥散模型,从几何非线性、材料非线性及求解方法等三个方面对极限承载能力分析的具体实现方式进行了讨论。用一试验结果对该方法进行了验证,并将其用于四跨P.C.曲线梁桥,从破坏型式、应力变化及变形发展等方面对结构极限状态进行了分析。结果表明:该方法通用、可靠,应用于实桥是可行的,为更深入了解P.C.曲线梁桥极限状态性能提供了新的方法。For prestressed concrete （P.C.） curved bridge, the method based on beam theory can not be used to analyze its behavior in ultimate state. Based on the traditional solid isoparametric element and shell theory, a new type of degenerated solid element was proposed, with bars modeled using the three-dimensional disperse model. Some key issues regarding the ultimate load capacity calculation, such as geometric nonlinear, material nonlinear and numeric algorithm were particularly discussed. The method was then validated experimentally, and used to analyze the behavior of a four-span P.C. curved bridge. The structure＇s damage pattern, stress variation and deformation development were analyzed. Results show that the proposed method is feasible and reliable for real bridge analysis.

关 键 词：预应力混凝土曲线桥 极限承载能力 实体退化单元 弥散钢筋模型 非线性 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] U448.42[交通运输工程—道路与铁道工程]