钢筋混凝土梁的统一设计
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摘要
钢筋混凝土梁的正截面抗弯和斜截面抗剪是分别进行设计的 ,梁正截面和斜截面承载力公式也是分别根据各自试验提出 .正截面试验时所用的箍筋量和斜截面试验时所用的纵筋量 ,都要比设计大得多 ,以保证出现典型的弯曲或剪切破坏形式 .但试验和公式中忽略了纵筋量和箍筋量的相互影响 .文中根据塑性理论 ,考虑混凝土单元开裂后的性能改变 ,利用有限元方法 ,对一根给定集中荷载作用下钢筋混凝土矩形截面梁进行统一设计 .同时 ,求出其达到极限状态时 ,设计所需要的纵筋量和箍筋量的相互关系 .建议取纵向钢筋恰好屈服点作为统一设计的参考点 ,并据此设计配筋 .
Normal sectional bemding and bevel shear of RC beam are respectively designed; and normal sectional and bevel formulas of bearing capacity are advanced in line with respective test. The amount of hoop reinforcement used in normal sectional test and the amount of longitudinal reinforcement used in bevel test are much more larger than those of design so as to assure the appearance of typical bending or shearing failure. In test and formula, the mutual influence of the amount of hoop reinforcement and the amount of hoop reinforcement is neglected. Based on theory of plasticity, the author designs integratedly a RC beam with rectangular section under a given centralined loading by using finite element method, with the performance change of concrete after unit cracking being taken into account and finds out the correlation between the amount of longitudinal reinforcement and the amount of hoop reinforcement demanded by the design at limit state; and suggests to take the just yield point of longitudinal reinforcement as reference point for integrated design, on which the design of reinforcement is based.
Normal sectional bemding and bevel shear of RC beam are respectively designed; and normal sectional and bevel formulas of bearing capacity are advanced in line with respective test. The amount of hoop reinforcement used in normal sectional test and the amount of longitudinal reinforcement used in bevel test are much more larger than those of design so as to assure the appearance of typical bending or shearing failure. In test and formula, the mutual influence of the amount of hoop reinforcement and the amount of hoop reinforcement is neglected. Based on theory of plasticity, the author designs integratedly a RC beam with rectangular section under a given centralined loading by using finite element method, with the performance change of concrete after unit cracking being taken into account and finds out the correlation between the amount of longitudinal reinforcement and the amount of hoop reinforcement demanded by the design at limit state; and suggests to take the just yield point of longitudinal reinforcement as reference point for integrated design, on which the design of reinforcement is based.
引文
1 卫纪德 .集中荷载作用下有腹筋约束梁的抗剪强度 [J].哈尔滨建工学院学报 ,1985,( 3) :16～ 31
2 Anderhegen E,Despot Z,Steffen P,et al.Reinforced concrete dimensioning based on element nodalforces[J].Journal of Structural Engineering,ASCE,1994 .12 0 ( 6) :1718～ 1731
3 姜庆远 ,邵永松 .纵向钢筋屈服后的钢筋混凝土梁抗剪强度的有限元分析 [J].世界地震工程 ,2 0 0 0 ,16( 1) :135～ 137
4 Hsu- Thomas T C.Unified theory of veinforced concrete[M].Florida:CRC Press,1993.1～ 190
5 Muttoni A,Schwartz J,Thürlimann B.Design of concrete structures with stress fields basel[M].Berlin:Birkhaüser,1996.17～ 18
2 Anderhegen E,Despot Z,Steffen P,et al.Reinforced concrete dimensioning based on element nodalforces[J].Journal of Structural Engineering,ASCE,1994 .12 0 ( 6) :1718～ 1731
3 姜庆远 ,邵永松 .纵向钢筋屈服后的钢筋混凝土梁抗剪强度的有限元分析 [J].世界地震工程 ,2 0 0 0 ,16( 1) :135～ 137
4 Hsu- Thomas T C.Unified theory of veinforced concrete[M].Florida:CRC Press,1993.1～ 190
5 Muttoni A,Schwartz J,Thürlimann B.Design of concrete structures with stress fields basel[M].Berlin:Birkhaüser,1996.17～ 18
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