西安建筑科技大学学报(自然科学版)

为适应当前公路、铁路运输量的急剧增长,本文设计出一种面向双层交通的钢筋混凝土箱梁桥.该桥梁取消了箱梁内部横隔板,同时利用箱梁顶板和底板作为桥面系,从而实现双层交通.本文对该箱梁缩尺模型(1:6)进行了多工况的拟静力加载试验,对其弹性工作性能进行了初步研究.结果表明:(1)腹板孔洞对箱梁整体及局部变形均有影响;(2)箱梁内横向加劲肋的刚度较弱;(3)上、下加载时箱梁顶底板剪力滞效应区别明显.因此,今后对该类箱梁进行结构设计时需要重点考虑腹板孔洞、横向加劲肋以及上下加载情况的影响.

In order to adapt to the rapid growth of the highway and railway consideration, a novel reinforced concrete(RC)box girder oriented to double-deck bridges was esigned. The internal diaphram of the box girder was eliminated so as to achieve the double-deck traffic function. In this paper, a scaled model(1:6)of the box girder was tested with various loading conditions, and the static elastic properties were studied. The results show that:(1)the web holes have significant influence on both the global and local deformation of the box girder;(2)the stiffness of the transverse stiffener for the tested girder is not large enough;(3)The shear-lag effect of the box girder with loads applied on the top plate is quite different from that on the bottom plate. Therefore, the influence of the web holes, transverse stiffeners and loading positions should be taken into special consideration in designing such kind of box girder.

引言
1 面向双层交通的混凝土箱梁桥
2 试验方案
3 试验结果
4 结论

图1 面向双层交通的混凝土箱梁桥图(左视图)<br/>Fig.1 Illustration of the RC box girder oriented to double-deck bridges(left view)

图1 面向双层交通的混凝土箱梁桥图(左视图)
Fig.1 Illustration of the RC box girder oriented to double-deck bridges(left view)

图2 钢筋混凝土箱梁模型(1:6)<br/>Fig.2 RC box-girder model(1:6)

图2 钢筋混凝土箱梁模型(1:6)
Fig.2 RC box-girder model(1:6)

表1 混凝土材料特性<br/>Tab.1 Material properties of concrete

表1 混凝土材料特性
Tab.1 Material properties of concrete

表2 钢筋材料性能<br/>Tab.2 Material properties of reinforcements

表2 钢筋材料性能
Tab.2 Material properties of reinforcements

图3 加载方式图<br/>Fig.3 Illustration of the loading regime

图3 加载方式图
Fig.3 Illustration of the loading regime

图4 试验II-c的测试设置<br/>Fig.4 Illustration of the test setup for test II-c

图4 试验II-c的测试设置
Fig.4 Illustration of the test setup for test II-c

表3 试验工况
Tab.3 Test conditions

图5 顶板纵向应变的横向分布(试验I)<br/>Fig.5 Transverse distributions of longitudinal strain on top plate(Test I)

图5 顶板纵向应变的横向分布(试验I)
Fig.5 Transverse distributions of longitudinal strain on top plate(Test I)

图6 顶板纵向应变的横向分布(试验II)<br/>Fig.6 Transverse distributions of longitudinal strain on top plate(Test II)

图6 顶板纵向应变的横向分布(试验II)
Fig.6 Transverse distributions of longitudinal strain on top plate(Test II)

图7 底板梁挠度的纵向分布(试验II)<br/>Fig.7 Longitudinal distributions of beam deflections on bottom plate(Test II)

图7 底板梁挠度的纵向分布(试验II)
Fig.7 Longitudinal distributions of beam deflections on bottom plate(Test II)

图8 4-4截面底板梁挠度的横向分布(试验II)<br/>Fig.8 Transverse distributions of beam deflections on bottom plate for Section 4-4(Test II)

图8 4-4截面底板梁挠度的横向分布(试验II)
Fig.8 Transverse distributions of beam deflections on bottom plate for Section 4-4(Test II)

[1] MACHACEK J, CUDEJKO M. Composite steel and concrete bridge trusses[J]. Engineering Structures, 2011, 33(12): 3136-3142.
[2] 吕志涛, 潘钻峰. 大跨径预应力混凝土箱梁桥设计中的几个问题[J]. 土木工程学报, 2010(1):70-76.
[3] 池田甫, 戴振藩. 利用部分预应力的混凝土桥[J]. 世界桥梁, 1982(4):10-29.
[4] 张强. 澳门西湾大桥设计的若干关键技术问题研究[D]. 武汉: 华中科技大学, 2006.
[5] NAKAMURA S I, MORISHITA H. Bending strength of concrete-filled narrow-width steel box girder[J]. Journal of Constructional Steel Research, 2008, 64(1):128-133.
[6] XIN R, SHI X, LI X. Failure analysis of tendon breakout on bottom slab of a pre-stressed concrete box gird bridge during construction[J]. Engineering Failure Analysis, 2012,25(4):291-303.
[7] GUO T, CHEN W H, SONG Y S. Bending capacity of reinforced concrete box-girders strengthened with smpm laminates[J]. Advanced Materials Research, 2012,368-373:2235-2240.
[8] KIM K, CHAI H Y. Ultimate strength interaction of bending and torsion of steel/concrete composite trapezoidal box girders in positive bending[J]. Advances in Structural Engineering, 2006,9(5): 707-718.
[9] 方志, 汪建群, 何鑫, 等. 预应力混凝土简支箱梁受力性能足尺模型试验[J]. 中国公路学报, 2011,24(6):49-56.
[10]汪建群, 谢子蓉, 祝明桥, 等. 面向双层交通的混凝土箱梁抗弯性能试验研究[J]. 工程力学, 2016,33(S1):196-200.
[11]郭建斌. 双层荷载连续箱梁剪力滞效应研究[D]. 福州: 福州大学, 2004.
[12]郑为明. 上下行分层矮斜拉连续箱梁桥静力分析及畸变研究[D]. 福州: 福州大学, 2005.
[13]魏伏佳. 面向双层交通的混凝土简支箱梁横向受力性能试验研究[D]. 湘潭: 湖南科技大学, 2014.
[14]郭金琼, 房贞政, 郑振. 箱形梁设计理论[M].第2版.北京:人民交通出本社, 2008.
[15]孙康杰. 面向双层交通混凝土简支箱梁的抗弯性能研究[D]. 湘潭: 湖南科技大学, 2013.
[16]赵振中. 面向双层交通混凝土伸臂箱梁剪力滞效应试验研究[D]. 湘潭: 湖南科技大学, 2013.

备注

引言

1 面向双层交通的混凝土箱梁桥

2 试验方案

3 试验结果

4 结论

期刊信息