钢箱桥塔内部通行孔应力集中分析

Stress Concentration Analysis of Access Holes in Steel Pylons

钢箱桥塔内部通行孔多为长圆形.采用保角变换和柯西积分方法,对开长圆孔无限大平面的应力场进行求解,通过算例验证其准确性.基于有限元数值模拟,分析板件长宽比和开孔率对有限大板应力集中系数的影响规律,并通过对无限大平面应力集中系数进行有限板宽修正,提出了可用于实际工程的有限大板应力集中系数简化计算公式.

Slotted holes are always provided in box-section steel pylons for the purposes of access and service. The stress fields of infinite planes containing slotted holes are solved by the use of conformal mapping and Cauchy integration, whose accuracies have been validated by typical examples. The influences of plate aspect ratio as well as hole width-plate width ratio on the stress concentration factor （SCF） are discussed on the basis of finite element results. Simplified SCF formulations used for the finite perforated plates in practical engineering are finally proposed by introducing plate width related correction factors into the results of infinite planes.