双向偏压作用下钢筋混凝土任意截面极限承载力的简便计算

Simplified Ultimate Strength Calculating Method for Arbitrary Reinforced Concrete Cross Section Under Bieccentric Loading

阐述了钢筋混凝土任意形状截面在双向偏压荷载作用下极限承载力的简便计算方法．混凝土、钢筋的实际应力—应变关系用三次多项式分段模拟，截面刚度系数用格林积分方法计算．以截面最大受压纤维处的应变为变量，用直接搜索法逼近截面极限荷载．所推导出的公式简单，计算方便，并给出截面极限承载力计算实例．

Simplified calculating method of ultimate strength is discribed for arbitrary reinforced concrete cross section under bieccentric loading. The real stress strain relation for concrete or reinforcement is simulated with piece wise cubic polynomials. The cross section stiffness is evaluated numerically by applying the Green′s theorem. The strain around of the maximum compressive fibre of the cross section is taken as a variable. The direct research method is used to reach the ultimate point. The derived formulas are simple and easy to calculate. The application of the present approach is demonstrated through several examples.