考虑施工阶段的装配式钢-混凝土组合梁非线性全过程分析方法

发布时间：2018-05-23 06:41

本文选题：桥梁工程 + 非线性全过程分析　；参考：《公路交通科技》2017年09期

【摘要】：为解决常规钢-预制混凝土桥道板组合梁的剪力键预留孔角隅和板间现浇接缝易开裂的问题,提出了带装配式栓钉(PCSS)剪力键和预制预应力桥道板的钢桁-混凝土组合梁(Prefabricated Steel Truss-Concrete(PSTC)Composite Beam)。针对从施工到成桥到破坏的全过程力学行为,提出了一种装配式组合梁的非线性全过程分析方法:建立精细化有限元模型,预制桥道板和板间接缝采用在混凝土实体单元中是否嵌入普通钢筋单元分别模拟;桥道板采用预应力钢束降温法模拟板内获得预压应力的过程;组合梁采用导入初应力的方法,实现将先期获得预压应力的桥道板与钢桁结整为组合梁共同受力。利用该方法模拟分析了装配式钢桁-混凝土组合梁在负弯矩作用下,从施工到成桥到破坏的全过程力学行为,并与组合梁负弯矩区段力学行为性能试验的结果进行了对比。结果表明:该模拟方法能较真实模拟装配式钢-混凝土组合梁从安装桥道板到桥道板的破坏的全过程受力行为,挠度计算值与实测值相差4.1%,吻合较好。
[Abstract]:In order to solve the problems of reserved hole corner of shear keys and easy cracking of cast-in-place joints between plates of conventional steel-precast concrete bridge slab composite beams, the prefabricated Steel Truss-Concrete(PSTC)Composite Beam-prefabricated beams with prefabricated prestressed concrete track slab and prefabricated prestressed concrete truss composite beams are proposed. According to the mechanical behavior from construction to bridge completion to failure, a nonlinear full process analysis method of assembled composite beam is proposed: the fine finite element model is established. The prefabricated bridge slab and the joint between the plates are simulated by whether or not the ordinary reinforcement element is embedded in the concrete solid element, the prestressed steel bundle cooling method is used to simulate the process of obtaining the pre-compression stress in the slab, and the method of introducing the initial stress into the composite beam is adopted. The bridge slab and steel truss are combined to form the composite beam. By using this method, the mechanical behavior of prefabricated steel truss concrete composite beams under negative bending moment is simulated and analyzed from construction to bridge completion to failure, and the results are compared with the experimental results of mechanical behavior in the negative moment section of composite beams. The results show that the simulation method can simulate the whole process of failure of composite steel-concrete composite beam from the installation of bridge track slab to the bridge slab, and the deflection calculation value is 4.1 different from the measured value, which is in good agreement.
【作者单位】：重庆交通大学山区桥梁结构与材料教育部工程研究中心;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：国家自然科学基金项目(51308571) 交通运输部应用基础研究项目(2013 319 814 040) 江西省交通运输厅科技项目(2014Y0007)
【分类号】：U445

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