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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。
In order to solve the problem of easy cracking of the cast-in-place joints between the shear key and the slab of the conventional composite steel-prestressed concrete pylon girder, PCSS shear bond and prestressed prestress Prefabricated Steel Truss-Concrete (PSTC) Composite Beam. Aiming at the mechanics behavior of the whole process from construction to bridge construction to destruction, a nonlinear full-process analysis method for fabricated composite beams is proposed. The finite element model is established. The prefabricated bridge plate and the inter- In the process of prestressing stress in the bridge plate by adopting prestressed steel beam cooling method; adopting the method of introducing initial stress in the composite beam to realize that the prestressing stress of the bridge plate and Steel truss truss to joint force. The mechanical behavior of the fabricated steel truss-concrete composite beam under the action of negative moment is simulated and analyzed in this paper. The results are compared with the results of the mechanical behavior test of the composite beam in negative bending moment Contrast. The results show that the simulation method can simulate the whole process of the whole process of the failure of the assembled steel-concrete composite beam from the installation of the bridge deck to the bridge deck board. The calculated value of deflection differs from the measured value by 4.1%, which is in good agreement.