为分析和优化超长悬挑钢支架锚固螺栓的设计方案，建立变参数条件下各锚固螺栓横截面应力计算模型，模拟两种超长悬挑钢支架所有锚固螺栓横截面应力的连续变化过程，分析参数变化对螺栓横截面应力的影响机理。以各个螺栓横截面应力最小为原则，优化悬挑钢支架设计方案，并将其用于实际工程。比较各锚固装置螺栓计算应力与COMSOL模拟应力，得出应力分布云图。数值计算结果表明：超长悬挑钢支架固定在柱上或梁上，当斜撑梁固定于外伸梁3/4长度位置时，所有锚固螺栓横截面所受最大正应力组合和平均切应力组合均最小，水平梁固定段螺栓横截面的平均切应力最大，斜撑梁螺栓横截面的最大正应力最大。研究成果可为超长悬挑钢支架及其锚固装置的设计提供指导。

In order to analyze and optimize the design scheme of anchoring bolts for super-long cantilever steel supports, a calculation model for the cross-sectional stress of each anchoring bolt under variable parameter conditions was established. The continuous change process of the cross-sectional stress of all anchoring bolts of two kinds of super-long cantilever steel supports was simulated, and the influence mechanism of parameter changes on the cross-sectional stress of bolts was analyzed. Based on the principle of minimum stress of each bolt cross section, the design scheme of cantilever steel support is optimized and applied to practical engineering. The calculated stress of the bolts of each anchoring device was compared with the simulated stress of COMSOL, and the stress distribution cloud map was obtained. The numerical calculation results show that no matter the super-long cantilever steel support is fixed on the column or the beam, when the diagonal bracing beam is fixed at the 3/4 length position of the extended beam, the maximum normal stress combination and the average shear stress combination of all the anchorage bolt cross sections are the smallest. The average shear stress of the bolt cross section of the fixed section of the horizontal beam is the largest, and the maximum normal stress of the bolt cross section of the diagonal bracing beam is the largest. The research results can provide guidance for the design of super-long cantilever steel support and its anchorage device.