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为研究波纹钢腹板体外预应力混凝土箱梁的塑性铰长度问题,采用有限元数值计算与既有试验数据相结合的方法,确定这类箱梁在地震等破坏荷载下的内力重分布及塑性变形能力。基于OpenSees平台建立了波纹钢腹板体外预应力混凝土箱梁的非线性有限元数值计算模型,利用2个不同学者的试验数据,从破坏荷载、跨中挠度、体外预应力筋应力增量、混凝土压应变等方面验证了数值计算模型,并对比分析了计入剪切变形和不计入剪切变形对箱梁挠度的影响;在此基础上,对影响波纹钢腹板体外预应力混凝土箱梁塑性铰长度的参数进行了研究。最后,通过比较已有公式的塑性铰长度计算值与数值模拟值,提出了适合波纹钢腹板体外预应力混凝土箱梁的塑性铰长度计算式。结果表明:实际计算中可以不计入剪切变形对波纹钢腹板体外预应力混凝土箱梁挠度的影响;剪跨比和有效预应力对波纹钢腹板体外预应力混凝土箱梁的塑性铰长度有显著影响,而受拉钢筋面积和混凝土强度对该类箱梁塑性铰长度的影响相对较小。
In order to study the plastic hinge length of prestressed concrete box girder with corrugated steel webs, the method of combining the finite element method with the existing experimental data was used to determine the internal force redistribution and plasticity of the box girder under earthquake and other destructive loads Deformation ability. Based on the OpenSees platform, a nonlinear finite element numerical model for the prestressed concrete box girder with corrugated steel webs was established. Based on the experimental data of two different scholars, from the failure load, midspan deflection, stress increment of prestressed tendons in vitro, Compressive strain and so on. The numerical calculation model is validated and the influence of shear deformation and shear deformation on the box girder deflection is analyzed. On this basis, the influences of the prestressed concrete box girder Plastic hinge length parameters were studied. Finally, the formula of plastic hinge length for prestressed concrete box girder with corrugated steel webs is put forward by comparing the calculated value of plastic hinge length with the numerical simulation value. The results show that the influence of shear span ratio and effective prestress on the deflection of prestressed concrete box girder with corrugated steel webs can be ignored in the actual calculation. The plastic hinge length of prestressed concrete box girder with corrugated steel webs Has a significant impact, while the tensile steel area and concrete strength of the box girder plastic hinge length is relatively small.