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与传统外围整体式防屈曲支撑不同的是,装配式组合防屈曲支撑的外围构件由多个组件通过连接件拼装而成,故外围连接的设计方法是此类防屈曲支撑构件设计理论的重要组成部分。针对一种四角钢组合约束型防屈曲支撑,已有适用于单向弯曲状态的外围连接螺栓内力的简化计算方法。但上述方法的适用性尚需经过精细有限元数值分析加以验证,并需进行适当修正,使其具有足够的计算精度,这是该文进行的研究工作之一。另外,由于内核构件与外围构件之间间隙的存在,防屈曲支撑构件更为常见的变形模式表现为双向弯曲变形,所以该文还将在单向弯曲状态所得到的螺栓内力计算公式的基础上进行进一步的组合,得到双向弯曲状态下的螺栓内力计算公式。该文最终给出了适用于四角钢组合约束型防屈曲支撑的外围螺栓连接的完整设计方法。
Different from the traditional peripheral integral buckling brace, the peripheral component of the fabricated composite buckling brace is composed of multiple components assembled by connecting pieces, so the design method of the peripheral join is an important part of the design theory of such buckling brace components section. Aiming at a kind of four-angle steel constrained buckling brace, a simplified calculation method of the internal force of the peripheral connecting bolt suitable for unidirectional bending has been proposed. However, the applicability of the above method needs to be verified by numerical analysis of the finite element method, and needs to be properly corrected so that it has sufficient calculation accuracy. This is one of the research work carried out in this paper. In addition, due to the existence of the gap between the core member and the peripheral member, the more common deformation mode of the buckling-resistant support member is the two-way bending deformation. Therefore, on the basis of the calculation formula of the bolt internal force obtained by unidirectional bending For further combination, the calculation formula of the bolt internal force in the bidirectional bending state is obtained. In the end, a complete design method for the peripheral bolting of the tetragonal restraining buckling brace is given.