西安建筑科技大学学报(自然科学版)

针对现有装配式桥梁结构中共性的技术难题,提升装配式桥梁结构的性能与品质,笔者团队以超高性能混凝土(UHPC)为基础,研发了具有高施工性能、高使用性能和高耐久性能的高性能装配式桥梁结构体系.本文介绍了笔者团队研发的3类高性能装配式桥梁结构:(1)装配式 UHPC 箱梁结构;(2)全预制UHPC “π” 形梁;(3)全预制钢-UHPC 轻型组合 “π” 形梁.通过大量的试验研究和理论分析,掌握了各类装配式UHPC 桥梁结构的基本受力性能,并初步建立了计算理论和设计方法.研究结果表明:(1)等强度承载条件下,装配式UHPC 桥梁结构自重可降为传统结构的40 ～ 50%,以方便运输,实现大构件快速化架设;(2)因 UHPC 中钢筋锚固长度仅需10 倍钢筋直径,现场各梁间结合部可大幅度缩小,可实现现场零焊接,减少现场作业量,并完全规避节点开裂、渗漏的风险;(3)结构抗腐蚀、抗冻、防渗漏性能优良,基本实现结构设计寿命周期内免维护.综合而言,基于UHPC 材料的高性能装配式桥梁结构有望突破现有装配式桥梁中的技术瓶颈,具有广阔的应用前景.

To address at the common technicalproblems existing in fabricated bridges, and to improve the performance and quality of bridge, based on ultra high performance concrete(UHPC)technology, the research group at Hunan a high performance fabricated bridge structure system is developed with excellent performance in workability, serviceability and durability. In this paper, three types of high performance bridge structures were introduced: i.e. fabricated UHPC box girder; fully fabricated UHPC π-shaped girder; and fully fabricated steel-UHPC π-shaped composite girder. Based on a great number of experimental studies and theoretical analysis, the research group revealed the basic mechanical performance of the fabricated UHPC bridge structure, and preliminarily developed the calculation theory and design method for them. Results show that:(1)With the same load-bearing capacity, the self-weight of UHPC fabricated bridge structure can be reduced to 40%～50% compared with conventional fabricated bridge structures, and it's convenient for large bridge component to be transported and hoisted,(2)Since the anchorage length of rebars can be dropped to 10d in UHPC, the field-cast joint between various girders can be obviously reduced. As a result, the welding of rebars and the amount of work in the construction site can be canceled and decreased respectively, while the risk of cracking and leakage in joint could be completely avoided;(3)The UHPC fabricated bridge structures could be maintenance-free in the service life owing to its excellent corrosion, freeze-thaw cycles and leakage resistance. To sum up, since the high performance fabricated UHPC bridge structures have the potential of overcoming technical bottlenecks in conventional fabricated bridges, they should have a promising future.

引言
1 关于超高性能混凝土(UHPC)
2 装配式UHPC箱梁结构研发
3 全预制UHPC “π” 形梁研发
4 全预制钢-UHPC组合“π”梁研发
5 结论

图1 UHPC的最大堆积密度配置原理<br/>Fig.1 Maximum packing density construction theory of UHPC

图1 UHPC的最大堆积密度配置原理
Fig.1 Maximum packing density construction theory of UHPC

表1 UHPC材料的基本性能指标<br/>Tab.1 Basic performance indexes of UHPC

表1 UHPC材料的基本性能指标
Tab.1 Basic performance indexes of UHPC

图2 不同材料等强度截面尺寸对比<br/>Fig.2 Comparison of cross section dimensions of different materials at equal strength

图2 不同材料等强度截面尺寸对比
Fig.2 Comparison of cross section dimensions of different materials at equal strength

图3 装配式UHPC箱梁<br/>Fig.3 Assembled UHPC box girder

图3 装配式UHPC箱梁
Fig.3 Assembled UHPC box girder

图4 装配式UHPC箱梁试验<br/>Fig.4 Experimental tests of assembled UHPC box girder

图4 装配式UHPC箱梁试验
Fig.4 Experimental tests of assembled UHPC box girder

图5 全预制UHPC“π”形梁<br/>Fig.5 Fully fabricated UHPC π-shaped girder

图5 全预制UHPC“π”形梁
Fig.5 Fully fabricated UHPC π-shaped girder

图6 局部加高“T”性接缝构造<br/>Fig.6 Locally elevated T joint

图6 局部加高“T”性接缝构造
Fig.6 Locally elevated T joint

图7 预制UHCP“π”形梁缩尺模型试验<br/>Fig.7 Scale model test of precast UHPC π-shape beam

图7 预制UHCP“π”形梁缩尺模型试验
Fig.7 Scale model test of precast UHPC π-shape beam

图8 UHPC桥面板湿接缝试验<br/>Fig.8 Experimental tests of wet joint in UHPC slab

图8 UHPC桥面板湿接缝试验
Fig.8 Experimental tests of wet joint in UHPC slab

图9 全预制钢-UHPC轻型组合“π”形梁<br/>Fig.9 Fully fabricated steel-UHPC lightweight π-shaped composite girder

图9 全预制钢-UHPC轻型组合“π”形梁
Fig.9 Fully fabricated steel-UHPC lightweight π-shaped composite girder

图10 钢-UHPC组合梁负弯矩区现浇接缝构造<br/>Fig.10 Steel-UHPC composite girder connection at negative moment region

图10 钢-UHPC组合梁负弯矩区现浇接缝构造
Fig.10 Steel-UHPC composite girder connection at negative moment region

图11 钢-UHPC组合“π”形梁墩顶负弯矩区现浇接缝模型试验<br/>Fig.11 Test of steel-UHPC composite girder connection at negative moment region

图11 钢-UHPC组合“π”形梁墩顶负弯矩区现浇接缝模型试验
Fig.11 Test of steel-UHPC composite girder connection at negative moment region

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备注

引言

1 关于超高性能混凝土(UHPC)

2 装配式UHPC箱梁结构研发

3 全预制UHPC “π” 形梁研发

4 全预制钢-UHPC组合“π”梁研发

5 结论

期刊信息