【摘要】 目的 为了充分发挥大梁高的蜂窝梁腹板优异特性，提出一种腹板双排开孔的新型蜂窝钢梁构件，给出截面正应力计算方法，为双排孔蜂窝梁的工程应用和后续研究提供参考。方法 应用ABAQUS软件建立双排孔蜂窝梁数值模型，在此基础上分析开孔率、中间梁桥高度对蜂窝梁横截面正应力分布、孔周周向应力分布的影响规律，将有限元模拟结果进行数值拟合得到正应力修正系数，并基于费式桁架法提出横截面正应力简化计算方法。结果 梁桥中心截面上腹板的最大正应力出现在翼缘与腹板连接处或靠近翼缘的开孔边缘处；墩板中心截面中性轴附近区域存在近零应力区段，其余部分的正应力接近于线性分布；孔周周向应力的最大值出现在梁桥中心截面上，在φ约为30°、150°、210°、330°处发生变号。结论 双排孔蜂窝梁的开孔率应不大于60%;双排孔蜂窝梁中间梁桥高度与梁高的比值应该控制在1/12～1/6,所提出的正应力简化计算方法在上述范围内具有良好的精度。更多还原

【Abstract】 In order to fully use the exceptional qualities of the web of the high castellated beam, a new castellated steel beam member with double-row holesis proposed and the section normal stress calculation method is provided for serving as a guide for engineering applications and related studies of castellated beams with double-row holes.The numerical model of a double-row opening castellated beam was built and validated using the finite element program ABAQUS.The effect of opening rate and intermediate girder bridge height on the the normal stress distribution of the cross-section and the circumferential stress distribution around the hole of the castellated beam is investigated.The positive stress concentration coefficients are obtained by numerically fitting the finite element simulation results, and a simplified calculation method of positive stresses in the cross-section is proposed based on the ferrous truss method.On the central cross-section of the girder bridge, the largest positive stresses in the web occur at the connection between the flange and the web or at the edge of the opening near the flange.A near-zero stress region occurnear the neutral axis of the central section of the pier, and the normal stress of the rest is close to linear distribution.The maximum circumferential stress of the hole appears on the central section of the girder bridge, and the sign changes at φ of approximately 30°,150°,210°,and 330°.The opening rate of double-row opening castellated beams should not exceed 60%,and the ratio of bridge height to beam height in the middle of the double-row opening castellated beams should be kept between 1/12 and 1/6.In the above given range, the proposed simplified calculation approach for positive stresses has good accuracy.更多还原