水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2013年
6期
171-175
,共5页
钢筋混凝土无腹筋梁%数值模拟%非线性静力有限元分析%受剪承载力%尺寸效应
鋼觔混凝土無腹觔樑%數值模擬%非線性靜力有限元分析%受剪承載力%呎吋效應
강근혼응토무복근량%수치모의%비선성정력유한원분석%수전승재력%척촌효응
reinforced concrete beam without stirrups%numerical simulation%nonlinear static finite element analysis%shear capacity%size effect
利用有限元软件 DIANA 中基于断裂力学的有限元模型，对钢筋混凝土无腹筋梁进行了非线性分析。在与试验结果进行对比分析的基础上，选取了其中一组试件，在更大尺寸下变换不同骨料粒径、混凝土强度、截面纵筋配筋率、剪跨比进行建模。通过数值计算，分析了截面高度和骨料粒径对钢筋混凝土无腹筋梁受剪承载力的影响，并且改进了我国混凝土规范无腹筋构件受剪承载力公式。结果表明：最大骨料粒径的变化对无腹筋梁受剪承载力无明显影响；梁的破坏剪应力随截面高度增加而降低，但破坏剪应力的降低幅度随梁高的增大而逐渐减小；改进后的无腹筋构件受剪承载力公式能较好反映大尺寸无腹筋构件尺寸效应的影响。
利用有限元軟件 DIANA 中基于斷裂力學的有限元模型，對鋼觔混凝土無腹觔樑進行瞭非線性分析。在與試驗結果進行對比分析的基礎上，選取瞭其中一組試件，在更大呎吋下變換不同骨料粒徑、混凝土彊度、截麵縱觔配觔率、剪跨比進行建模。通過數值計算，分析瞭截麵高度和骨料粒徑對鋼觔混凝土無腹觔樑受剪承載力的影響，併且改進瞭我國混凝土規範無腹觔構件受剪承載力公式。結果錶明：最大骨料粒徑的變化對無腹觔樑受剪承載力無明顯影響；樑的破壞剪應力隨截麵高度增加而降低，但破壞剪應力的降低幅度隨樑高的增大而逐漸減小；改進後的無腹觔構件受剪承載力公式能較好反映大呎吋無腹觔構件呎吋效應的影響。
이용유한원연건 DIANA 중기우단렬역학적유한원모형，대강근혼응토무복근량진행료비선성분석。재여시험결과진행대비분석적기출상，선취료기중일조시건，재경대척촌하변환불동골료립경、혼응토강도、절면종근배근솔、전과비진행건모。통과수치계산，분석료절면고도화골료립경대강근혼응토무복근량수전승재력적영향，병차개진료아국혼응토규범무복근구건수전승재력공식。결과표명：최대골료립경적변화대무복근량수전승재력무명현영향；량적파배전응력수절면고도증가이강저，단파배전응력적강저폭도수량고적증대이축점감소；개진후적무복근구건수전승재력공식능교호반영대척촌무복근구건척촌효응적영향。
The finite element software DIANA was used in a finite element model based on fracture mechanics ,and the nonlinear finite element was adopted to analyze the reinforced concrete beams without stirrups .Based on the comparison analysis with test results ,a group of specimens in larger size were selected for modeling in different aggregate size ,con-crete strength ,longitudinal reinforcement ratio and shear span .According to the numerical calculations ,the influence of aggregate size and depth on the ultimate shear strength of reinforced concrete beams without stirrups was discussed ,and the shear design method in the Code for Design of Concrete Structures (GB 50010 -2010) for reinforced concrete mem-bers without stirrups was improved .The results indicate that the change of the maximum aggregate size has no significant impact on the failure shear stress of reinforced concrete beams without stirrups ,and the failure shear stress is gradually reduced with the increase of depth ,but the variation of the shear stress failure is decreased gradually with the increase of depth .The improved shear equation of the members without stirrups can well reflect the size effect for large members .
