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(四)关于腹筋梁抗剪能力的估計从前面所述的腹筋梁的破損状态看来,腹筋梁的抗剪强度問題由于有了腹筋的影响之后更增加了問題的复杂性。到目前为止,列入規范中的計算方法,仍脫离不了以古典理論計算来估計腹筋梁的承截能力。只是在是否可以考虑混凝土和腹筋共同抗剪方面存在着分歧罢了。在我們所找到的資料中,关于腹筋梁抗剪能力估计的規定方面,主张混凝土和腹筋共同抗剪的有苏联房建規范〔10〕、〔15〕美国規范〔12〕、〔13〕欧州混凝土协会規范〔14〕。不建綫混凝土与腹筋共同負担剪力的有德国〔18〕、英国〔19〕、日本以及苏联桥涵设計規范〔20〕。在这些規范中,除了苏联房建規范和苏联桥涵設計規范中的第一种极限状态的計算都是以M. C. 波里山斯基公式来估計腹筋梁的承载能力之外(苏联桥涵設計規范CH200-62虽規定在进行第一种极限状态的检算时可按波氏公式考虑混凝土和腹筋共同承担剪力;但尚需对剪应力,即主应力强度进行疲劳驗算。此时,如剪应力超过
(IV) Estimation of the Shear Capability of a C-Beam From the above-mentioned damage state of a C-beam, the problem of the shear strength of the C-beam is further complicated by the influence of the C-bar. So far, included in the calculation of the norms, still can not be separated from the classical theory to calculate the calculation of the abdominal girder load-bearing capacity. It is just a matter of divergence in whether shear resistance of concrete and abdominal tendons can be considered. In the information we have found, on the provisions of the web girder shear capacity estimation, advocating the common anti-shear concrete and abdominal tend to the Soviet Union housing construction code 〔10〕 〔15〕 US Code 〔12〕 〔13〕 European Concrete Association norms 〔14〕. Not to build concrete and abdominal tendons together bear the shear force of Germany [18], Britain 〔19〕, Japan and the Soviet Union bridge design specifications 〔20〕. Among these codes, except for the first limit state in the Soviet Union’s building codes and the Soviet bridge and culvert design codes, the MC Polysandski formula is used to estimate the carrying capacity of the web girders (Soviet Bridge Design Code CH200-62 Although the provisions of the first limit state in the test can be considered according to the Bourdon ’s formula and the abdominal force to share the shear force; but still need to shear stress, the main stress intensity fatigue checking. At this time, such as shear stress exceeds