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对于嵌入墙体中的钢筋混凝土挑梁(图1),一般可将插入段作为半无限长弹性地基梁来进行分析。本文采用文克尔(Winkler)弹簧地基模型求解砌体的变形和应力,砌体的垫层系数k沿用《砖石结构设计手册》(1976年中国建筑工业出版社出版)中的建议值,以使挑梁嵌固端砌体的局压计算与现行砖石结构设计规范(GBJ3-73)及上述手册中梁端局压计算的基本假设及有关公式相一致。故概念明确,方法简便实用,易为设计者掌握。一、砌体应力分析设砌体符合文克尔弹性地基梁假定。当挑梁受外荷载P_o、M_o作用后,其嵌固端上下底面各点的沉降y与该点的压应力σ成正
For a reinforced concrete cantilever embedded in a wall (Figure 1), the insertion section can generally be analyzed as a semi-infinitely long elastic foundation beam. In this paper, the Winkler spring foundation model is used to solve the deformation and stress of the masonry. The cushion coefficient of the masonry k follows the recommended values in Masonry Structure Design Handbook (published by China Building Industry Press, 1976). The calculation of the partial pressure of the masonry block-fixed masonry is consistent with the basic assumptions and relevant formulae of the current masonry structural design specification (GBJ3-73) and the beam-end partial pressure calculation in the above manual. Therefore, the concept is clear, the method is simple and practical, easy for the designer to grasp. 1. Analysis of masonry stress Masonry conforms to the hypothesis of the Winkler elastic foundation beam. When the beam is subjected to external loads P_o and M_o, the settlement y of the points on the upper and lower bottom surfaces of the anchoring end are positive to the compressive stress σ at that point.