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Parametric Analysis for Fire Resistance of Composite Steel-Concrete Beams with Corrugated Webs Accounting
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摘要: 波纹腹板钢-混凝土组合梁相对于传统组合梁具有较高的承载力，在工程中得到了广泛的应用。为了研究波纹钢腹板组合梁在火灾高温作用下抗火性能，采用ABAQUS有限元分析软件建立了波纹腹板组合梁在高温下的热-力耦合模型，通过分析波纹腹板组合梁跨中挠度、梁端轴力随温度变化曲线研究了荷载比、跨高比、腹板波角、转角约束比和轴向约束比对组合梁抗火性能的影响。结果表明：无梁端约束的波纹腹板组合梁在高温作用下，中和轴沿截面高度不断上移，最后形成塑性铰而达到临界状态；波纹腹板组合梁在无转角和轴向约束时，荷载比对波纹腹板钢-混凝土组合梁抗火性能有较大影响，随着荷载比的增加，组合梁临界温度也随之下降；在高温作用下，随着跨高比增大，波纹腹板组合梁临界状态时挠度值也越大；在其他条件相同时，腹板波角越小，说明其越接近平腹板组合梁，在高温作用下腹板越易发生局部失稳，因此抗火性能越差。当波纹腹板组合梁考虑端部约束后，组合梁在相同的荷载比条件下，其临界温度更高，约为无端部约束波纹腹板组合梁临界温度的1.2~1.5倍，且达到临界状态时挠度更小，约为无端部约束波纹腹板组合梁临界温度的0.6~0.8；波纹腹板组合梁转角约束比越大，跨中挠度下降速率越慢，梁端承受的负弯矩就越大，梁端下翼缘越容易发生受压屈曲破坏；无端部约束的波纹腹板组合梁，当腹板波角为65°时，跨中挠度下降速率最快，而具有端部约束的波纹腹板组合梁在腹板波角为45°时，组合梁挠度最大。Abstract: Steel-concrete composite beams with corrugated webs have higher bearing capacity than traditional composite beams.In this paper, ABAQUS finite element method is used to established the corrugated web under the high temperature thermal-mechanical coupling model.The influence of load ratio, span-height ratio, web wave angle, corner constraint ratio and axial constraint ratio on the fire resistance of composite beams is studied by analyzing the mid-span deflection and the variation curve of axial force at beam end with temperature of corrugated web composite beams.The results show that neutral axis of composite beams with corrugated webs moves up continuously along section height and finally forms the plastic hinge and reaches the critical state when exposed to fire. Without rotation and axial restraints, the load ratio has a greater impact on the fire resistance of steel-concrete composite beams with corrugated webs; as the load ratio increases, the critical temperature of the composite beam also decreases; under high temperature, the span-to-height ratio increases. The smaller, the deflection value of the composite beam in the critical state is smaller; under other conditions being the same, the larger the web wave angle is, the closer it is to a flat web composite beam, the more likely it is that local instability will occur, and the fire resistance will be worse. After considering the beam rotation and axial restraints, the critical temperature of the composite beam is higher under the same load ratio, which is about 1.2 to 1.5 times the critical temperature of the unconstrained composite beam. When the critical state is reached, the deflection is smaller, about 0.6 to 0.8. When the corner constraint is large, The larger the corner restraint ratio of corrugated web composite beams, the slower the rate of mid-span deflection decrease, the greater the negative bending moment at the beam end, and the more prone the lower flange of the beam end to buckling failure under compression. When the wave angle of the web is 65, the mid-span deflection of the composite beam with non-end restraint corrugated web decreases fastest, while the composite beam with end restraint corrugated web has the largest deflection when the wave angle of the web is 45.
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Key words:
- corrugated web /
- steel-concrete composite beams /
- end restraints /
- fire resistance /
- parameter analysis
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