Failure mode analysis of hinged voided slab with gate-type steel rebars at bottom of junction surface
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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8 m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69 kN(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85 kN(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140 kN(2.00倍车辆荷载)提高至199 kN(2.84倍车辆荷载), 且不出现贯通的纵桥向裂缝。Abstract: 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 69 kN(0.99 times of vehicle load), but the crack appears at the middle of voided slab when the load reaches 85 kN(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 increases unobvious, but the load that through cracks appear along the intersection between slab and hinged joint increases from 140 kN(2.00 times of vehicle load)to 199 kN(2.84 times of vehicle load), and through crack along longitudinal direction can be prevented.
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图 3 结合面底部带门式钢筋的空心板
Figure 3. Voided slab with gate-type rebars at bottom of junction surface
图 18 结合面顶、底部纵桥向裂缝
Figure 18. Longitudinal cracks at top and bottom of junction surface
图 24 结合面跨中截面竖向滑移量曲线
Figure 24. Vertical slipping curves of mid-span section of junction surface
图 27 顶、底部裂缝沿纵桥向长度曲线
Figure 27. Length curves of longitudinal cracks at top and bottom of hinged joint
图 29 空心板跨中截面荷载-纵向应变曲线
Figure 29. Load-longitudinal strain curves on mid-span sections of voided slabs
表 1 混凝土本构关系参数
Table 1. Constitutive relation parameters of concretes
表 2 ηi-j计算结果
Table 2. Computation result ofηi-j
% 
表 3 铰缝构造破坏模式
Table 3. Failure modes of hinged joint
表 4 空心板破坏模式
Table 4. Failure mode of voided slab
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