钢筋混凝土及预应力混凝土受扭构件承载力计算-结构工程专业论文.docxVIP

叮弘3 叮弘3 1／’毕} 提 要 本文通过对一百多个钢筋混凝土纯扭构件试验数据的分析，提出了完全建立在 薄壁管空间桁架模型理论之上的钢筋混凝土纯扭构件受扭承载力单项式计算公式。 采用此公式，钢筋混凝土弯剪扭复合受力构件的计算改为不考虑相关作用，分别按 受弯、受剪及纯扭强度公式计算其配筋，然后将纵筋、箍筋面积叠加的方法，大大 减少了计算工作量。采用此公式，也较好地简化了箱形截面受扭构件承载力计算。 用此公式及新规范的受弯构件受弯、受剪承载力计算公式对矩形、箱形截面中高强 混凝土纯扭、剪扭及弯剪扭构件受扭承载力进行了计算并与新规范公式计算结果进 行了比较说明，本文方法计算简便，并取得与规范相当的精度，具有较好的实用性。 采用本文建议公式，尚能较好地解决压弯剪扭构件及预应力混凝土复合受力构件承 载力的计算问题。最后，根据《统一标准》对公式承载力极限状态可靠度进行了验 算，并由此确定了单项式公式的系数数值。 关键词：钢筋混凝土 预应力混凝土 受扭承载力 结构可靠度 ABSTRACTThrough ABSTRACT Through analyses of over one hundred experimenta】data of reinforced concrete members under pure torsion，the thesis proposes fl monomial formula of torsional capacity totally based on a thin—walled tube，space truss analogy．Using the formula，the transverse and longitudinal reinforcement of reinforced concrete members under combined torsion． bending，and shear,Can be calculated separately according to corresponding formulas without consideration of concrete correlation and then sum up．The method reduces much calculation work．Using the formula，the calculation of box cross—section torsionaI members Can also be well simplified．Results of rectangular cross．section and box cross。section，normal—strength and high—strength concrete members under combined torsion，bending，and shear,are obtained through the proposed method using the formula and the shear capacity calculating formula and compared with the predicted values calculated using the new Code method．The proposed simple method of the thesis cajl be used conveniently,get comparative precision with the new Code method and have preferable practicability．Using the formula，the calculation problems of reinforeed concrete members under torsion，bending，shear and compression and prestressed concrete members under combined loads Can also be better solved．In the end．the thesis does checking computations for ultimate limit states reliability and determineS the coeffieient for the monomial formula． Keywords：reinforced concrete prestressed concrete torsional capacity structural relia