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The mechanics and behavior of continuous deep beams are briefly discussed from which a strutandtie model for such a beam is developed.


The usual design practice for continuous deep beams has been to employ empirical equations, which are invariably based on simple span deep beam tests.


Typical cracking behavior of continuous deep beams Deep beams, in general, develop little initial flexural cracking.


Given the unique behavioural pattern of continuous deep beams, this practice is unrealiable.


Continuous deep beams occur as transfer girders in multistorey frames, as pile caps and as foundation wall structures etc.




 Based on the nonlinear analysis of finite element and test, the article introduces the behaviour and collapse mechanism of reinforced concete continuous deep beams. It also offers that the reaction of supports of beams varies with the change of spandepth ratio. The maximum moment of the contiuous deep beam exists in span and not at midsupports. The position of tensile region of the section at midsupports goes down as the spandepth ratio reduces. When the spandepth ratio is less than... Based on the nonlinear analysis of finite element and test, the article introduces the behaviour and collapse mechanism of reinforced concete continuous deep beams. It also offers that the reaction of supports of beams varies with the change of spandepth ratio. The maximum moment of the contiuous deep beam exists in span and not at midsupports. The position of tensile region of the section at midsupports goes down as the spandepth ratio reduces. When the spandepth ratio is less than or egual fo1.0, no point of inflexion appears sometimes. In accordance with the data obtained from the test of 24 reinforced concrete continuous deep beams, the article provides the bending moment and shearing strength formulae and design details. Meanwhile, influence line of various continuous deep beams has been calculated through finite element method for designers.  根据非线性有限元法的分析和试验结果,本文研究了连续深梁的受力特性和破坏机理,并指出连续深梁的支座反力随跨高比的不同而变化;梁的最大弯矩发生在跨中而不是在中间支座;中间支座截面受拉区的位置随着跨高比的减小而下移;当跨高比小于或等于1.0时跨中有时不出现反弯点等现象,按作者所进行的24根连续深梁的试验资料,提出了抗弯强度与抗剪强度的计算式和构造要求,并以有限元法计算了各类连续深粱的影响线,供设计者配套使用。  The authors, using the finite element method, analyse the rules of continuous deep beam internal forces under the influence of the support plate width. Meanwhile they study transmission force features that the live load is applied on each support crosssection, and present rational simplified computation model. Also they draw up internal force calculation tables of 2 5 equal span, different spandepth ratio and every crosssection in continuous deep beams under the action of the live load. The tables... The authors, using the finite element method, analyse the rules of continuous deep beam internal forces under the influence of the support plate width. Meanwhile they study transmission force features that the live load is applied on each support crosssection, and present rational simplified computation model. Also they draw up internal force calculation tables of 2 5 equal span, different spandepth ratio and every crosssection in continuous deep beams under the action of the live load. The tables can be used by designers.  作者以有限元法分析了连续深梁的内力受支座垫板宽度影响的变化规律;分析了活荷载作用在各支座截面的传力特性,并提出了合理的简化计算模型。编制了2—5等跨的不同跨高比的连续深梁在活荷载作用下各截面的内力计算表格,供设计人员使用。  A general discussion about the finite element method of R/C continuous deep beams is made. Two ordinary cracking models are examined and compared. A new cracking model named mixed model is proposed. The model has the features of both smeared and discrete cracking models. Some elastic supports are introdu ced to the boundary condition of deep beams. A method of modifying the stiffn ess of cracking element is suggested. A computation program in FORTRAN77 is made. Some R/C continuous deep... A general discussion about the finite element method of R/C continuous deep beams is made. Two ordinary cracking models are examined and compared. A new cracking model named mixed model is proposed. The model has the features of both smeared and discrete cracking models. Some elastic supports are introdu ced to the boundary condition of deep beams. A method of modifying the stiffn ess of cracking element is suggested. A computation program in FORTRAN77 is made. Some R/C continuous deep beams are analysed with the program. Some experiments of twospan continuous deep beams are made. In the experiments a new method to keep the three supports on a straight line is used. the computati on results are compared with the experiment results. A conclusion can be made that. the methods used in the analysis are reasonable.  本文结合连续深梁对我筋混凝土非线性有限元分析方法进行讨论。其中对混凝土 开裂的混合模型做了探讨，并分析比较连续深梁支承的各种计算模型；论证了钢筋混 凝土连续深梁引用部分弹性支承的合理性；对单元开裂后的刚度处理做了改进；编制 了钢筋混凝土深梁受力全过程分析程序．对若干根连续深梁做了计算；做了六根承受 集中荷载的两跨连续深梁试验，用边加载边调平的方法保证试验梁为刚性支承．裂缝 分布、开裂荷载、破坏荷载以及Ｐ－δ曲线等计算结果基本上反映了深梁主要特性。   << 更多相关文摘 
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