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为降低常规钢-混凝土组合主梁结构的自重,解决其混凝土桥面板易开裂的问题,提出了钢-UHPC轻型组合梁结构方案,该结构方案能明显降低结构自重。为得到新型钢-UHPC轻型组合梁结构桥面板的受力状况,以在建实桥应用工程胜天大桥为工程背景,分别采用应力叠加法、全桥精细有限元法和混合有限元法,对其桥面板受力最不利位置的纵桥向拉、压应力进行了计算分析。结果表明:混合有限元法与全桥精细有限元法计算结果相差在4%以内,二者结果较接近;应力叠加法相比全桥精细有限元法计算结果差值为1.58~3.80 MPa,相差在12%以上,结果偏保守。计算结果与试验结果对比表明,UHPC桥面板纵桥向最大设计拉应力小于UHPC最大裂缝宽度为0.05 mm时的实测名义拉应力,纵桥向压应力远小于UHPC抗压强度,能够满足在最不利加载工况下的设计要求。
In order to reduce the self-weight of the conventional steel-concrete composite main beam structure and solve the problem of easy cracking of the concrete bridge deck, a steel-UHPC light composite beam structure scheme is proposed, which can obviously reduce the structural self-weight. In order to obtain the stress of the bridge deck of the new steel-UHPC lightweight composite beam structure, based on the engineering construction of the Shengtian Bridge in Jianshiqiao, stress superposition method, full-bridge finite element method and mixed finite element method The most unfavorable position of the bridge deck longitudinal longitudinal pull, compressive stress were calculated and analyzed. The results show that the difference between the mixed finite element method and the full bridge finite element method is within 4%, and the difference between the two methods is close. The difference between the stress superposition method and the full bridge finite element method is 1.58-3.80 MPa, 12% or more, the result partial conservative. The comparison between the calculated results and the experimental results shows that the maximum designed tensile stress in longitudinal bridge of UHPC bridge deck is less than the measured nominal tensile stress when the maximum crack width of UHPC is 0.05 mm and the compressive stress in longitudinal bridge is far less than UHPC compressive strength, Design requirements under load conditions.