杭瑞高速岳阳洞庭湖大桥为(1480+453.6)m双塔双跨钢桁梁悬索桥,主梁为采用了钢-S T C轻型组合桥面的板桁结合型钢桁加劲梁,钢-STC轻型组合桥面支承体系由横向桁架支承及桥面纵、横梁支承组成.采用ANSYS软件建立主梁节段有限元模型,针对组合桥面支承体系,从横向桁架结构形式、桥面纵横梁体系及其结构尺寸等方面进行设计优化.结果表明,带竖腹杆的横向桁架结构形式在桥面刚度、构件应力水平方面均具有较大优势;多横梁体系桥面刚度大,桥面构件应力水平低,适用于钢-STC轻型组合桥面.洞庭湖大桥板桁结合加劲梁钢-STC组合桥面支承体系采用带竖腹杆的横向桁架,纵横梁支承体系采用在横向桁架竖腹杆位置设置边纵梁、次横梁间距2.8m的多横梁体系,能够很好地兼顾结构刚度、应力水平及钢材用量.

钢筋混凝土设缝墩是一种抗推柔度较大的新型桥墩,适用于连续刚构体系桥.该文制作了3个不同填料的钢筋混凝土设缝墩和1个整体墩模型,通过静载试验和数值分析,研究其在水平与竖向荷载共同作用下的极限承载力、延性及抗推柔度.试验采用单调加载直到模型破坏,检测了模型的应力变形、裂缝开展与破坏形态;采用计算软件,考虑混凝土与缝内填料的接触作用,建立结构有限元三维模型进行分析.研究结果表明:缝内填料与混凝土之间出现滑离;各设缝墩的极限水平承载力基本相同,比整体墩水平承载力降低约16％;4个模型墩的抗推延性系数为5.5～7.1,延性较好,整体墩与橡胶板设缝墩的延性大于空缝墩和竹夹泡沫板设缝墩;3个设缝墩抗推柔度比整体墩大有提高,设缝墩抗推柔度为整体墩的2.4～3.5倍,橡胶板设缝墩和空缝墩抗推柔度较高;设缝墩抗推柔度随缝宽增大逐步减小.

以某异形拱桥为工程背景,对其进行了环境振动试验,利用频域法进行了模态参数识别,获得了前8阶模态;建立了该桥的全桥三维有限元模型,通过参数灵敏度分析选取待优化参数,以频率误差百分比平方和最小为目标函数,基于实测模态数据对有限元模型进行了模型修正.修正后参数取值合理,频率误差明显减小,得到了符合实际的基准有限元模型.

高烈度区的斜拉桥地震响应较大,要求主塔等重要结构保持在弹性范围内并要有效控制主梁位移,因此选择合理的纵桥向抗震体系就显得尤为重要.通过归纳并比较了现有的各种纵向抗震体系的设计理念,分析了各种纵向抗震体系的纵桥向传力机理,基于一座斜拉桥实例,比较了3种抗震体系的结构地震反应.详细的参数分析表明,采用纵桥向弹性约束体系,选取合理结构参数,可大幅减小主塔的地震内力和主梁地震位移.

The Structural design of prestressed concrete cable-stayed bridge with five towers and rigid-Continuous girder system in a practical project was introduced in this paper.Two new technologies are proposed: In order to adapt to the longitudinal deformation of multi span beams temperature, creep and shrinkage of concrete and the action of earthquake, improve the flexibility of anti thrust of piers, a new type of bridge pier with isolation joint is designed, that is isolation double limb piers;Due to the depth of weter, and the requirement of bridge landscape effect is high, a new type of collision avoidance system of the floating type composite material is used in the bridge pier.The two new technologies used in this study have advantages of mechanical performance, economic and aesthetic.

This paper simulates the practical engineering, using plexiglass to make a three-span continuous wide curved box girder model by the geometry scale ratio 1:30. With the model load test, measured the strain and deflection of the control cross-sections, got the distribution about the stress and deflection of the wide curved continuous box girder; And we proposed the “uniformity coefficient” to express the uneven force of the curved bridge. Compared the finite element analysis results and experimental data, the results show both are in good agreement.

以汝城至郴州高速公路文明特大桥为依托工程,介绍了一种关于高墩刚构桥梁纵、横向静风荷载效应的适用分析计算方法,可为该类结构的抗风设计提供技术参考.

论文首次提出“墩顶刚度”概念,它是一个直观反映墩梁固结的柔性桥墩刚度与内力、位移关系的力学参数.将墩项刚度应用于墩梁固结桥墩的受力分析和结构优化,是一种实用的科学研究方法.

由于预应力等因素的影响,后张预应力混凝土T梁在张拉阶段会产生一定的侧弯现象。该文以工程上应用较广,侧弯病害较明显的新版部颁通用图40m跨径预应力混凝土T梁边梁为例,建立仿真模型,得出不同受力条件下主梁的应力及位移,分析侧弯对梁体的影响,并给出针对性的处理措施。

Pingsheng Bridge in Foshan is the first single-tower and single-span hybrid girder self-anchored suspension bridge with a main span of 350m. Making use of a total bridge model, the system transition process and structure response are studied. The structure design and key technologies, model test process and static and dynamic test results of the total bridge model are introduced. In the test model of the bridge, the influence of compression and deformation of stiffening girders must be considered to satisfy the similarity conditions. During the course of transition of the structural system, the main cable's deformation is nonlinear, whereas since the structural internal force is unrelated with the order of hanger tensioning, the demanded line shape can be realized for all the transitions. Control of the unstressed length is a proper method for determining the tensile force and the structure states in the course of transition of the self-anchored suspension bridge. Under live load, the mechanical properties of self-anchored suspension bridges are linear. Some mechanical properties of self-anchored suspension bridges and earth-anchored suspension bridges are alike, while others different.

介绍了世界第一座独塔自锚式悬索桥平胜大桥的建设条件、方案构思及桥型总体设计,综述了自锚式悬索桥设计的关键和创新技术。

通过运用结构的复合非线性(几何非线性和材料非线性)极限分析理论,对国内一座在建的368 m大跨径钢管混凝土中承式系杆拱桥进行了复合非线性稳定性空间分析,在此基础上,还对该钢管混凝土拱桥主拱肋矢跨比、钢管壁厚及混凝土标号等的设计合理性进行了一些探讨.

论述了黑石铺湘江大桥主桥中承式钢管混凝土拱桥的总体设计及构造上的部分特点、各阶段的内力计算和分析,并简要介绍了主桥的施工设计.