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首页> 外文期刊>Journal of Composites for Construction >Flexural Behavior of a Carbon Fiber-Reinforced Polymer Prestressed Decked Bulb T-Beam Bridge System
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Flexural Behavior of a Carbon Fiber-Reinforced Polymer Prestressed Decked Bulb T-Beam Bridge System

机译：碳纤维增强的聚合物预应力装饰灯泡T型梁桥系统的弯曲行为

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摘要

Experimental and numerical investigations were conducted to evaluate the performance of a newly developed bridge system. Through the investigation, a decked bulb T-beam bridge model was constructed, instrumented, and tested under service and ultimate loads. The bridge model had a width of 2.59 m (8.5 ft), an effective span of 9.45 m (31 ft), a depth of 356 mm (14 in.), and was composed of five adjacent decked bulb T-beams. The T-beams were interconnected at their top flanges using 76-mm (3-in.)-wide ultra-high-performance concrete (UHPC) shear key joints and five full-depth equally spaced transverse diaphragms along the span. Each diaphragm was postten-sioned with two nonbonded transverse carbon fiber composite cable (CFCC) strands. The investigation revealed that the developed decked bulb T-beam bridge system maintained its structural integrity under service loads with signs of distress in neither the shear key joints nor top flanges. UHPC shear keys with the transverse diaphragms were adequate to achieve monolithic action across the width of the bridge model. In addition, transverse posttensioning forces were effective in restoring the structural integrity of the bridge model when cracks were artificially induced in the shear key joints. At the ultimate limit state the bridge model exhibited compression failure by crushing of the concrete in the top flange. The compression failure was associated with low ductility, a dense cracking pattern, and excessive deflection.
机译：进行了实验和数值研究，以评估新开发的桥梁系统的性能。通过调查，在服务和极限载荷下构造，测试并测试了带甲板灯泡T型梁桥模型。桥梁模型的宽度为2.59 m（8.5 ft），有效跨度为9.45 m（31 ft），深度为356 mm（14 in。），由五个相邻的平板T型梁组成。使用76毫米（3英寸）宽的超高性能混凝土（UHPC）剪力键接头和沿跨度的五个全深度等距横向隔板将T型梁的顶部凸缘互连。每个隔膜都用两根非粘结的横向碳纤维复合电缆（CFCC）线束张紧。调查显示，已开发的带鳞片的T形T型梁桥系统在使用载荷下仍保持其结构完整性，在剪力键连接处和顶部法兰中均未出现损坏迹象。具有横隔膜的UHPC剪切键足以在整个桥梁模型的宽度上实现整体作用。此外，当在剪力键接缝中人为地引起裂纹时，横向后张力可有效地恢复桥梁模型的结构完整性。在极限状态下，桥梁模型由于顶部法兰中的混凝土压碎而出现压缩破坏。压缩失败与低延展性，致密的裂纹模式和过度的挠曲有关。

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