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进行了全跨竖向均布荷载和半跨竖向均布荷载作用下焊接工字形截面两铰抛物线钢拱平面内稳定承载力试验研究。通过试验揭示了抛物线钢拱平面内的失稳破坏机理,全跨竖向均布荷载作用下抛物线钢拱发生不完全反对称的平面内失稳破坏,半跨竖向均布荷载作用下抛物线钢拱发生反对称的平面内失稳破坏;半跨竖向均布荷载作用下抛物线钢拱的稳定承载能力低于全跨竖向均布荷载作用下的稳定承载能力;试验结果与有限元法分析结果进行了对比,二者吻合良好,有限元法研究钢拱的平面内稳定具有很高的精度;试验结果验证了工字形截面抛物线钢拱平面内稳定性设计方法安全可靠,可供设计使用。
The stability and bearing capacity of two-parabolic parabolic steel arch with welded I-section under full-span vertical load and half-span load are studied. The mechanism of instability failure in parabolic steel arch plane is revealed through experiments. The incompletely anti-symmetric in-plane instability damage of parabolic steel arch occurs under the action of uniform load across the whole span, and the parabolic steel under semi- The anti-symmetric in-plane instability of the arch occurs in the arch; the steady bearing capacity of the parabolic steel arch under the semi-vertical uniform load is lower than that under the full-span vertical uniform load. The experimental results and the finite element analysis The results are compared with each other. The two agree well with each other. Finite element method is used to study the in-plane stability of the steel arch with high accuracy. The test results verify that the in-plane stability of the I-shaped parabola steel arch is safe and reliable and can be used for design.