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在钢筋混凝土结构中,由于混凝土应力应变关系的非线性、杆件受拉区混凝土可产生裂缝及软钢有明显的屈服台阶等性质,钢筋混凝土结构从加荷到破坏的全过中杆件刚度均处于不断变化状态,超静定结构各杆件的实际内力与习用的线性弹性分析有显著差别。这种相对于弹性分析所得内力的差别,可视为结构的内力重分布。在满足静力平衡、杆件受压区混凝土的极限变形和截面转动要求的前提下,结构内力可人为地进行调整。近年来各国多采用在线性弹性分析的基础上对结构内力进行调幅的方法。但是,调整幅度差异较大,更主要地
In reinforced concrete structures, due to the non-linear stress-strain relationship of concrete, concrete cracks in the tension zone of steel members and obvious yielding steps of soft steels, the stiffness of steel bars in reinforced concrete structures is increased from loading to failure. Both are in a state of constant change, and the actual internal forces of the statically indeterminate structures are significantly different from the conventional linear elastic analysis. This difference in internal force relative to the elastic analysis can be seen as the redistribution of the internal forces of the structure. The internal force of the structure can be artificially adjusted under the premise of satisfying the static balance and the limit deformation and cross-section rotation requirements of the concrete in the compression zone of the bar. In recent years, many countries have adopted methods for amplitude modulation of structural internal forces based on linear elastic analysis. However, the difference in adjustments is quite different and more importantly