摘要
以在空心板与铰缝构造结合面底部布设门式钢筋的深铰缝构造为研究对象,参照2007年交通运输部颁布的装配式空心板桥标准图,设计了一跨8m足尺模型,通过试验和非线性有限元法分析了车辆荷载作用下铰接空心板破坏类型、破坏位置与开裂荷载等破坏模式。分析结果表明:试验验证了铰接空心板非线性有限元模型能较好地模拟铰接空心板在车辆荷载作用下的受力性能;在空心板与铰缝结合面的三个方向的黏结滑移关系中,应以竖向相对滑移量作为结合面黏结破坏失效的指标;在车辆荷载作用下,空心板与铰缝结合面是最薄弱的受力部位,当荷载达到69kN(0.99倍车辆荷载)时,空心板与铰缝结合面底部开裂,但当荷载达到85kN(1.21倍车辆荷载)时,空心板跨中截面底部才出现横向裂缝;与在结合面底部不设门式钢筋的空心板相比,在结合面底部设置门式钢筋后虽不能明显提高铰缝构造的开裂荷载,但可以将铰缝通缝荷载从140kN(2.00倍车辆荷载)提高至199kN(2.84倍车辆荷载),且不出现贯通的纵桥向裂缝。
Focused on the full-depth hinged joint with gate-type steel rebars at the bottom of junction surface between voided slab and hinged joint,a full-scale model with one span of 8 m according to the standard drawings of hinged voided slab bridge issued by Ministry of Transportation in 2007 was designed.With experiment and nonlinear finite element method,the failure modes of hinged voided slab under vehicle load were studied,including failure type,failure position and cracking load.Analysis result indicates that the nonlinear finite element model can properly simulate the mechanical properties of hinged voided slab under vehicle load by comparing with experimental result.The vertical relative slip is regarded as the index of cohesion failure of junction surface in three directions of bonding-slip relationship.Under vehicle load,the weakest position is the junction surface between voided slab and hinged joint.The surface starts to crack when the load reaches 69kN（0.99 times of vehicle load）,but the crack appears at the middle of voided slab when the load reaches 85kN（1.21 times of vehicle load）.Compared with the experiment on hinged voided slab with full-depth joint without gate-type steel rebars,when the gate-type steel rebars are laid at the bottom of junction surface,the cracking load increasesunobvious,but the load that through cracks appear along the intersection between slab and hinged joint increases from 140kN（2.00 times of vehicle load）to 199kN（2.84 times of vehicle load）,and through crack along longitudinal direction can be prevented.4tabs,29 figs,21refs.
出处
《交通运输工程学报》
EI
CSCD
北大核心
2015年第5期15-25,共11页
Journal of Traffic and Transportation Engineering
基金
教育部新世纪优秀人才支持计划项目(NCET-13-0737)
河北省交通科技项目(Y-2011023)
关键词
桥梁工程
铰接空心板
铰缝构造
门式钢筋
受力性能
足尺模型试验
非线性有限元
bridge engineering
hinged voided slab
hinged joint structure
gate-type steel rebar
mechanical property
full-scale model test
nonlinear finite element
