混凝土設(shè)計(jì)基本原理-第7章受扭構(gòu)件的扭曲截面承載力(已修改)
2025-01-31 03:59 本頁面
【正文】 第 7章 受扭構(gòu)件承載力計(jì)算 Chaper 7 Torsional strength of members （概述） Introduction （純扭構(gòu)件試驗(yàn)研究） Experiment about pure torsion member （純扭構(gòu)件承載力） Torsional capacity of members under pure torsion （彎、剪、扭構(gòu)件承載力） Torsional capacity of member under bined flexure, shear and torsion （構(gòu)造要求） Detailing requirements Introduction（概述） 兩類扭矩 （ Two types of torsion） Equilibrium torsion (平衡扭矩 )： 根據(jù)靜力平衡條件確定的扭矩、初始扭矩 statically determinate torsion。 primary torsion 由靜力平衡確定，與剛度無關(guān) It is determined based on static equilibrium, and not related to the torsional stiffness. Compatibility torsion (協(xié)調(diào)扭矩 )： statically indeterminate torsion（超靜定扭矩） 。 secondary torsion 無法根據(jù)靜力平衡確定，與剛度及變形相關(guān) It cannot be determined based on static equilibrium alone, and related to the torsional stiffness and deformation of members . Experiment of pure torsion 1.（開裂前純扭構(gòu)件受力分析） Mechanical analysis of pure torsion before crack 主拉應(yīng)力超過抗拉強(qiáng)度后，開裂，并沿 45 176。 斜向發(fā)展，和上下底面相交后進(jìn)行發(fā)展，形成螺旋形斜裂縫，構(gòu)件破壞。 When the principle stresses exceed the tensile strength, cracks form at the middle point of longer side and extend diagonally along 45176。 line to the neighboring faces. Finally, cracks are spiral when the member reaches its ultimate capacity. Spiral cracks 2. Torsional reinforcements（受扭鋼筋） Stirrups Longitudinal bars 2. 受扭破壞模式 scarcereinforced failure（少筋破壞） Tension failure Underreinforced failure（適筋破壞） Bending failure Underreinforced member , scarcereinforced member , Partially overreinforced member , Overreinforced member When member is adequately reinforced , the reinforcements yield before concrete crushes. Calculation of torsional strength（承載力計(jì)算） When torsional reinforcements are inadequate , members fail as soon as cracks form. Minimum amount of torsional reinforcements（ 最小鋼筋用量） Partially overreinforced failure（部分超筋） Overreinforced
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