Study on Whole-Process Mechanical Behavior of Novel Spread Slab Beam Bridges

doi:10.12141/j.issn.1000-565X.220770

Abstract

Abstract:

To study the whole-process structural performance of new spread slab beam bridges, this paper investigated the damage development and failure mechanisms from construction to in-service stages with beam clear spacing, beam number and prestressing steel arrangement as key parameters. The nonlinear numerical analyses were preformed on the bridge system with using ABAQUS software. Research outcome indicates that the beam failure and mixed beam-slab failure are two main failure patterns for this new bridge system. When the beam clear spacing is small, the deformation of all beams is consistent, and the ultimate strength is relatively higher, which is prone to the failure of beams. On the contrary, when the beam clear spacing is large, the transverse load transfer capacity is relatively weaker and the deformation-lag effect exists among different slab beams, resulting in the mixed beam-slab failure. For spread slab beam bridge cases with similar bridge width and span length, a relatively larger beam spacing value is unfavorable for the transverse load sharing, and the ultimate strength of the entire bridge system may be significantly reduced by 40%~50%. The bearing capacity of bridge cases with less beam numbers can be improved by increasing the prestressing steel amount, and the ultimate strength of a single slab beam may be increased by 10%~30%. However, the camber issue at the precasting stage should be handled with caution in the design. Compared with the integral casting concrete beam bridge, this composite beam bridge system is different in the displacement and stress responses obtained from the whole-process analysis, but their difference in the ultimate strength is small. In general, the new spread slab beam bridge system shows good strength and deformation capability, and the characteristics of light weight, low profile and easy construction, owning a good application prospect in China.

Key words: bridge engineering, whole-process mechanical behavior, damage development, failure mechanism, load-bearing capacity

CLC Number:

TU375

JIANG Dongqi, WU Hao, FAN Jin. Study on Whole-Process Mechanical Behavior of Novel Spread Slab Beam Bridges[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(1): 38-51.

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References 17

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编号	桥宽/m	梁宽/m	梁高/m	梁数/根	主梁净距/m	跨径/m	钢绞线数量/根	端部脱粘预应力筋数量/根
桥例1	8.5	1.00	0.450	7	0.250	14.9	32	6
桥例2	12.0	1.50	0.450	6	0.600	14.8	44	8
桥例3	12.0	1.50	0.450	4	2.000	12.9	52	10
桥例4	10.4	1.52	0.381	4	1.422	14.6	56	6
桥例5	11.5	1.52	0.381	6	0.406	14.8	54	16

编号	挠度/mm			屈服荷载/kN	极限荷载/kN	极限弯矩值/（kN·m）
编号	第1步	第2步，中梁	第2步，边梁	屈服荷载/kN	极限荷载/kN	极限弯矩值/（kN·m）
桥例1	38.1（↑）	18.6（↑）	20.6（↑）	6 200	8 006	4 311
桥例2	39.4（↑）	18.5（↑）	21.5（↑）	5 400	7 606	6 192
桥例3	31.5（↑）	11.0（↑）	17.1（↑）	5 500	6 437	7 751
桥例4	43.2（↑）	6.7（↑）	15.5（↑）	3 672	4 538	4 938
桥例5	49.6（↑）	14.0（↑）	17.7（↑）	3 863	5 328	3 599

编号	钢绞线数量/根	预应力筋偏心距/mm	预应力筋张拉后中梁上挠值/mm	桥面板浇筑后中梁上挠值/mm	极限荷载/kN	极限弯矩值/（kN·m）
桥例3	52	75	31.5	11.0	6 437	7 751
桥例3a	32	75	13.9	-6.9	4 797	4 704
桥例3b	44	75	24.6	3.9	5 886	6 691
桥例3c	52	85	37.5	17.2	6 538	7 694
桥例3d	52	95	43.6	23.4	6 647	7 788

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