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首页> 外文会议>PCI anniversary convention >STATIC AND FATIGUE PERFORMANCE OF HYBRID PRECAST PRESTRESSED CONCRETE BRIDGE TRUSS GIRDERS
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STATIC AND FATIGUE PERFORMANCE OF HYBRID PRECAST PRESTRESSED CONCRETE BRIDGE TRUSS GIRDERS

机译：杂交预制预应力混凝土桥梁桁架桁架桁架桁架桁架桁架大梁的静态和疲劳性能

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An innovative system for short and medium-span bridges comprising transversely spaced hybrid precast prestressed concrete truss girders and a cast-in-situ or precast concrete deck slab has been developed. The girders have top and bottom concrete chords connected by vertical compression and diagonal tension members made of concrete-filled fiber reinforced polymer (FRP) tubes. The vertical compression members are connected to the chords by means of dowels protruding from the ends. The diagonal tension members are connected to the chords using double-headed bars. The chords are pretensioned during fabrication. The girders may be post-tensioned by external tendons after erection to balance the slab weight and to provide continuity in multi-span bridges. All reinforcement and prestressing can be made of corrosion-resistant steel or glass and carbon FRP. The proposed truss girder is thus light in weight with enhanced durability. The light weight allows for longer spans and reduces the initial cost. The enhanced durability reduces the maintenance cost and leads to longer life span. An experimental evaluation of performance of large-scale truss girders under static and fatigue loading is presented. A total of ten girder specimens were fabricated and tested. All girders had identical cross-section dimensions with 1.2 m (4 ft) overall depth. Four of the girders consisted of 2, 4, 6, and 8 truss panels, respectively, with span lengths varying from 2.30 to 9.25 m (7.7 to 30.8 ft), and were tested under monotonic loading up to failure. The remaining six girders consisted of two truss panels each and were tested under cyclic fatigue loading of different level and amplitude. The post-fatigue resistance was also investigated. The tests showed excellent performance of the truss girders in terms of strength, stiffness, and fatigue life.
机译：对于包括横向隔开的混合预制短期和中期跨度桥梁的创新系统预应力混凝土桁梁和铸原位或预制混凝土楼板已经研制成功。大梁具有增强的聚合物（FRP）管顶部和由垂直压缩和由混凝土填充纤维的对角线张力构件连接底部混凝土和弦。垂直压缩部件由从端部突出的定位销连接到弦杆。对角拉构件连接到使用双头棒的和弦。该和弦制造过程中预张紧。大梁可以是后张勃起后通过外部筋平衡板坯的重量和在多跨度桥提供连续性。所有钢筋和预应力可以由耐腐蚀钢或玻璃和碳FRP的。所提出的桁梁因此处于重量增强的耐久性的光。重量轻允许更长的跨度，并降低了初始成本。增强的耐久性降低了维护成本，并导致更长的寿命。的下静态和疲劳载荷的大型桁梁性能的实验评估被呈现。总共10梁试样分别制造和测试。所有梁具有相同的横截面尺寸与1.2米（4英尺）总深度。大梁的四个分别由2，4，6，和8块桁架板，与跨度长度改变从2.30 9.25米（7.7至30.8英尺），而根据单调加载到故障进行测试。其余六个梁包括两个桁架板的每个和下不同水平和振幅的循环疲劳载荷进行了测试。后的耐疲劳性也研究。试验表明在强度，刚度和疲劳寿命方面的桁梁的优异性能。

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