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首页> 外文期刊>Construction and Building Materials >Flexural behaviors and capacity prediction on damaged reinforcement concrete (RC) bridge deck strengthened by ultra-high performance concrete (UHPC) layer
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Flexural behaviors and capacity prediction on damaged reinforcement concrete (RC) bridge deck strengthened by ultra-high performance concrete (UHPC) layer

机译：超高性能混凝土（UHPC）层加固受损钢筋混凝土（RC）桥面板的抗弯性能和承载力预测

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摘要

Based on strengthening a damaged bridge deck in the field, this paper conducted flexural experiments on a scaled damaged bridge deck strengthened by reinforced ultrahigh performance concrete (UHPC) layer with high temperature steam and normal temperature curing; this paper investigates cracking capacity, ultimate capacity, deformation features and failure mode of RC-UHPC composites under positive bending moment and negative bending moment, respectively. Experimental results indicate that cracking and ultimate capacity of composites increased by about 2.5 and 2 times respectively with UHPC located at tension face comparing with intact RC slab; while for UHPC at compression face, no change in cracking capacity was observed and ultimate capacity was 30% higher than that of intact RC slab. Meanwhile, stiffness also obviously increased with tensile stress in steel reinforcement in RC slabs, decreasing after strengthening for all strengthened slabs; and propagation of cracks in RC slabs was restrained and delayed due to ultrahigh ductility and behavior of strain hardening of UHPC. Based on experimental results and failure mode, analytical equations for cracking and ultimate flexure capacity of UHPC-RC slabs were constructed, and applicability of equations was validated by some experimental results in this paper and other literature with good accuracy by predicted equations. Finally, the research achievements of this paper were effectively applied on the reinforcement design of damaged deck of main girder in a cable-stayed bridge. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在现场加固破损桥面基础上，对高温超高强混凝土（UHPC）层经高温蒸汽和常温固化加固的鳞片破损桥面进行了抗弯试验。本文分别研究了RC-UHPC复合材料在正弯矩和负弯矩下的开裂能力，极限承载力，变形特征和破坏模式。实验结果表明，与完整的RC板相比，位于张拉面上的UHPC的复合材料的开裂和极限承载力分别增加了约2.5倍和2倍。而对于UHPC压缩面，未观察到开裂能力的变化，极限承载力比完整的RC板高30％。同时，钢筋混凝土楼板中钢筋的刚度也随着拉应力的增加而明显增加，所有加固后的楼板刚度都降低。由于超高延展性和UHPC的应变硬化行为，RC板的裂纹扩展受到抑制和延迟。根据实验结果和破坏模式，建立了UHPC-RC板的开裂和极限抗弯承载力分析方程，并通过本文的一些实验结果和预测方程，很好地验证了该方程的适用性。最后，将本文的研究成果有效地应用于斜拉桥主梁破损桥面的加固设计。 （C）2019 Elsevier Ltd.保留所有权利。

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