装配式小箱梁桥超高性能混凝土免支模湿接缝抗弯性能

doi:10.13229/j.cnki.jdxbgxb.20221403

摘要/Abstract

摘要：

为提高装配式小箱梁桥湿接缝的抗裂性并简化现场施工工艺，提出了一种超高性能混凝土（UHPC）免支模湿接缝构造形式和设计方法，并研究了UHPC湿接缝的抗弯性能。基于平截面假定、截面平衡条件以及钢筋、UHPC和普通混凝土的本构关系，提出了考虑受拉区UHPC对抗弯承载力贡献的UHPC-NC组合截面抗弯承载力计算方法，将理论值与有限元计算值进行对比。基于UHPC免支模湿接缝设计方法，计算其截面形式下各参数的可行值，并拟合得到湿接缝矩形条带宽度与小箱梁桥面板计算跨径的函数关系式。同时，基于有限元方法建立UHPC免支模湿接缝数值模型，分析了湿接缝构造形式和湿接缝宽度等参数对UHPC湿接缝抗弯承载力的影响规律。研究结果表明：本文方法的计算值与经验证后的有限元计算值吻合较好，可为UHPC湿接缝的设计提供指导。免支模湿接缝构造形式充分发挥了UHPC优异的力学性能，抑制了裂缝的发展，提高了桥面板的耐久性和承载力，提高了现场施工效率。当小箱梁桥横向钢筋直径为16 mm时，免支模湿接缝最小宽度为140 mm，且能发挥预制桥面板施工性能和经济性能。

关键词: 装配式桥梁, 超高性能混凝土, 湿接缝, 设计方法, 抗弯性能

Abstract:

In order to improve the crack resistance of wet joints in prefabricated small box girder Bridges and simplify the site construction process， a construction form and design method of UHPC wet joint without formwork was proposed and its bending resistance was studied. Based on the assumption of flat section， the condition of cross-section equilibrium， the constitutive relation of steel bar， UHPC and concrete， a method for calculating the flexural capacity of the UHPC-NC composite section considering the contribution of UHPC in the tensile zone was proposed. The calculated value of the formula was compared with the finite element calculation. Based on the design method of UHPC wet joint without formwork， the feasible values of each parameter under the section form were obtained， and the functional relationship between the width of the wet joint rectangle strip and the calculated span of the small box girder bridge panel was obtained by fitting. Meanwhile， based on the finite element method， the numerical model of UHPC wet joint without formwork was established， the influence of the structure form of wet joint and the width of wet joint on the flexural capacity of UHPC wet joint was analyzed. The results show that the calculated value of the formula and the finite element calculation are in good agreement， which can provide guidance for the design of wet joints. The wet joint without formwork can give full play to the excellent mechanical properties of UHPC， inhibit the development of cracks， improve the durability and bearing capacity of bridge deck， and speed up the construction efficiency. The minimum width of the wet joint without support mold is 140 mm at the condition of the transverse steel bar diameter of the small box girder bridge is 16 mm， and the construction performance and economic performance of the precast bridge panel can be played.

Key words: prefabricated bridge, ultra-high performance concrete, wet joint, design method, flexural capacit

中图分类号:

U445.57

朱劲松,佟欣瑶,刘晓旭. 装配式小箱梁桥超高性能混凝土免支模湿接缝抗弯性能[J]. 吉林大学学报(工学版), 2024, 54(9): 2568-2580.

Jin-song ZHU,Xin-yao TONG,Xiao-xu LIU. Flexural behavior of ultra-high performance concrete joint without formwork in prefabricated small box girder bridges[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(9): 2568-2580.

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考虑方面	设计理念
安全性	斜截面增大UHPC-NC接触面积，提高界面黏结强度，解决接缝界面易开裂的问题，UHPC可提高接缝抗弯承载力
耐久性	高应力区域设计矩形条带，有效抑制裂缝发展，UHPC耐久性好，开裂后无渗漏风险
施工性	直筋搭接，减少现场焊接量无需底部模板，提高了施工效率和施工质量UHPC养护时间短，可实现快速化施工
经济性	UHPC可以缩短湿接缝宽度，造价经济抗裂性好，后续维护费用低

h/mm	γ=0.1	γ=0.3	γ=0.5	γ=0.7	γ=0.9
20	0.71	0.79	0.88	0.96	1.05
40	0.76	0.84	0.91	0.98	1.05
60	0.80	0.86	0.92	0.98	1.03
80	0.84	0.89	0.93	0.98	1.02
100	0.90	0.93	0.96	0.99	1.02
120	0.90	0.93	0.95	0.97	0.99
140	0.88	0.89	0.90	0.91	0.92
160	0.95	0.95	0.96	0.96	0.97
180	0.97	0.87	0.87	0.87	0.87
平均	0.85	0.88	0.92	0.97	0.99
标准差	0.064	0.041	0.029	0.008	0.057

α/（°）	h₁/mm	h₂/mm	T/mm	W/mm
30	40	~	~	140
30	50	~	~	175
30	60	20 ~ 50	500	210
30	70	~	~	245
30	80	~	~	280

编号	h₁/mm	a/（°）	h₂/mm	T/mm	变化参数
J-1	80	30	30	500	标准接缝板
J-2	80	0	30	500	截面形式
J-3	80	30	0	0	截面形式
J-4	60	30	30	500	湿接缝宽度
J-5	40	30	30	500	湿接缝宽度

截面形式	开裂荷载	极限荷载	开裂位置
矩形有条带	190.2	623.4	UHPC-NC界面
漏斗无条带	193.4	572.3	预制NC板
免支模有条带	195.4	625.5	预制NC板