波纹腹板H型钢梁受弯承载力性能研究

Bending capacity of H-beams with corrugated webs

为研究波纹腹板H型钢梁的受弯性能,首先对其进行理论分析,得出波纹腹板H型钢梁的承载力完全由上、下翼缘提供,腹板不承担弯曲正应力,并提出受弯承载力的理论计算式。设计完成2个试件的受弯承载力试验,得到了试件的荷载-位移曲线、极限荷载和破坏形态等。试验结果证明了所提出理论分析模型的正确性,并验证了所提出的承载力计算式是安全合理的。为了进一步验证理论分析模型,同时支持参数分析,采用有限元方法对波纹腹板H型钢梁的受弯性能进行数值模拟。有限元方法和试验得到极限弯矩等结果较为接近,试验梁的破坏弯矩超过理论塑性弯矩20%以上。通过参数分析可知:稠密腹板波形及较小的翼缘宽厚比能够提高极限弯矩;腹板高厚比对极限弯矩无显著影响。

To analyze the bending performance of H-beams with corrugated webs,the theoretical analysis was conducted firstly.It is believed that the top and bottom flanges provide the total bending capacity without the contribution of web.The theoretical equation was proposed.Then bending tests of two simply supported beams were conducted.The load-deformation curves,ultimate load and failure mode were obtained.The test results verified the correctness of the mechanical model and the equation.To validate the theoretical model and support the parametric study,the finite-element simulation method was adopted to simulate the bending performance of H-beams with corrugated webs.The ultimate bending moments calculated by two methods are very close,both exceeding the plastic moments by 20%.Through the parametric study,the following conclusions are drawn： denser wave profiles and lesser width-thickness ratio of flanges can provide higher ultimate bending moments;the depth-thickness ratio of the web has no significant effect on the ultimate bending moment.