首页|轻型组合桥梁负弯矩区接缝抗弯性能试验

轻型组合桥梁负弯矩区接缝抗弯性能试验

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对适用于轻型组合桥梁负弯矩区的T形横向接缝抗弯性能进行试验研究，对负弯矩加载接缝的全过程进行理论分析，对接缝设计参数进行讨论。研究结果表明，随着荷载的增大，试件的主裂缝出现在连续浇筑的UH-PC接缝界面和加载点下方的面板表面，试件中部未发现明显裂纹，UHPC接缝界面的可视初裂强度可以满足实桥设计荷载。对试验梁进行分析，提出接缝最大裂缝宽度、考虑UHPC拉伸刚度效应的设计弯矩和挠度计算公式，获得每阶段承载力的计算式，预测结果与试验结果吻合良好。通过参数讨论和计算可知，跨度L=20～50m的轻型组合桥梁T形接缝上部加长长度可以设置为0。1L。
Experiment on flexure behavior of joint in negative moment area of lightweight composite bridge
Experimental research was conducted on the flexural performance of T-shaped transverse joints suitable for the negative bending moment area of lightweight composite bridges.A theoretical analysis of the entire process of applying negative bending moments was conducted,and the design parameters for the joint were discussed.Results show that the primary crack in the specimens appears at the interface of the continuously cast UHPC joint and the panel surface below the loading point as the load increases.No significant cracks were observed in the middle of the specimens,and the visual initial crack strength of the UHPC joint interface can meet the design loads of real bridges.An analysis of the test beam was conducted,and formulas for calculating the maximum crack width of the joint,the design bending moment considering the effect of UHPC tensile stiffness,and deflection were proposed.Formulas for calculating the bearing capacity at each stage were obtained,and the predicted results accorded well with the experimental results.Parameter discussions and calculations show that the upper extended length of T-shaped joint in lightweight composite bridges with spans ranging from 20 m to 50 m can be set to 0.1 times of spans.

ultra high performance concrete(UHPC)UHPC jointbending resistance testcalculation formula of crack widthcalculation formula of deflectioncalculation formula of ultimate bearing capacity

邓舒文、邵旭东、晏班夫、邱明红

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湖南农业大学水利与土木工程学院,湖南长沙 410125

湖南大学土木工程学院,湖南长沙 410082

广西大学土木建筑工程学院,广西南宁 530004

香港大学土木工程系,香港 999077

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超高性能混凝土(UHPC) UHPC接缝 抗弯性能试验 裂缝宽度计算式 挠度计算式 极限承载力计算式

国家自然科学基金湖南省自然科学基金湖南省教育厅项目

521082112022JJ4018621B0188

2024

10.3785/j.issn.1008-973X.2024.02.018

浙江大学学报(工学版)
浙江大学

浙江大学学报(工学版)

CSTPCD北大核心
影响因子：0.625
ISSN：1008-973X
年,卷(期)：2024.58(2)
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