斜拉体系加固桥梁桥下连接件力学性能

doi:DOI:10.13229/j.cnki.jdxbgxb20210255

摘要/Abstract

摘要：

针对斜拉体系加固梁桥下连接件具有承受剪压组合荷载、双剪切界面、粘贴钢板与螺栓锚固混合连接等受力特点，但力学性能及破坏模式不明确的缺点，通过Abaqus有限元方法建立了某桥下连接件的精确有限元模型，对其力学性能及破坏模式开展了研究。结果表明，各模型的最终破坏模式均为螺栓的剪切破坏，模型最终破坏位置分2类：胶层面处的螺栓剪切破坏和两钢板接触面处的螺栓剪切破坏。荷载作用下桥下连接件共存在4种承载力变化趋势，部分模型破坏前承载力出现明显的下降段。影响模型极限承载力的要素中仅单一要素变化时，极限承载力并不完全以单调趋势变化，即各要素间存在复杂的耦合关系。

关键词: 斜拉体系加固, 桥下连接件, 剪压组合荷载, 双剪切界面, 混合连接

Abstract:

The cable-stayed system reinforcement method has been applied to some projects in recent years. The joints under the bridge have the characteristics of bearing combined shear and compression loads， double-shear interface， bonded steel plate and anchored bolt mixed connection， etc. The mechanical properties and failure modes are not clear. An accurate finite element model of a connector under the bridge was established by Abaqus finite element method， and its mechanical properties and failure modes were studied. The results show that the final failure mode of each model is the bolt shear failure. The final failure position of the model is divided into two categories： the bolt shear failure at the glue layer and the bolt shear failure at the contact surface of the two steel plates. Under the load， there are 4 kinds of bearing capacity change trends of the connectors under the bridge， and the bearing capacity of some models decreases obviously before failure. When only a single element among the factors that affect the ultimate bearing capacity of the model changes， the ultimate bearing capacity doesn't completely change in a monotonous trend， there is a complex coupling relationship between every element.

Key words: cable-stayed system reinforcement, under-bridge connector, combined shear and compression load, double shear interface, hybrid connection

中图分类号:

U441.4

王有志,赵文帅,刘金樟,邱凯,贾森. 斜拉体系加固桥梁桥下连接件力学性能[J]. 吉林大学学报(工学版), 2022, 52(10): 2376-2384.

You-zhi WANG,Wen-shuai ZHAO,Jin-zhang LIU,Kai QIU,Sen JIA. Mechanical performance of under⁃bridge connectors of cable⁃stayed system strengthened bridge[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(10): 2376-2384.

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类型	α/（°）	θ/（°）	a/mm
35°承压板	35	125	116
45°承压板	45	135	92
60°承压板	60	150	50

胶层种类	δ₁/mm	δ_S/mm	G_τc/（N·m^-1）
A	0.25	5	10
B	0.50	10	10
C	0.75	15	10

模型	螺栓破坏模式	极限承载力/kN
35?A?0.3	Ⅰ?a	506.99
35?A?0.4	Ⅰ?b	502.55
35?A?0.5	Ⅰ?c	497.10
35?A?0.6	Ⅰ?c	497.56
35?B?0.3	Ⅰ?a	510.98
35?B?0.4	Ⅰ?b	563.18
35?B?0.5	Ⅱ	588.54
35?B?0.6	Ⅱ	590.64
35?C?0.3	Ⅳ?b	536.87
35?C?0.4	Ⅳ?a	587.51
35?C?0.5	Ⅲ	626.12
35?C?0.6	Ⅲ	690.59
45?A?0.3	Ⅳ?c	358.95
45?A?0.4	Ⅰ?a	413.76
45?A?0.5	Ⅰ?b	414.54
45?A?0.6	Ⅰ?c	398.58
45?B?0.3	Ⅳ?b	359.18
45?B?0.4	Ⅰ?a	418.78
45?B?0.5	Ⅰ?b	444.46
45?B?0.6	Ⅱ	471.90
45?C?0.3	Ⅳ?b	358.71
45?C?0.4	Ⅳ?a	448.74
45?C?0.5	Ⅳ?a	469.17
45?C?0.6	Ⅲ	502.21
60?A?0.3	Ⅳ?b	248.10
60?A?0.4	Ⅳ?b	287.80
60?A?0.5	Ⅰ?a	329.79
60?A?0.6	Ⅰ?a	346.03
60?B?0.3	Ⅳ?c	249.46
60?B?0.4	Ⅳ?c	295.41
60?B?0.5	Ⅰ?a	335.09
60?B?0.6	Ⅰ?a	351.85
60?C?0.3	Ⅳ?c	266.88
60?C?0.4	Ⅳ?c	320.51
60?C?0.5	Ⅳ?b	357.41
60?C?0.6	Ⅳ?a	369.54