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(二)罩筋截面中混凝土徐变及收縮影响的一般公式现在討論截面为单測配筋的梁,并处在以任意規律随时間变化的外力作用下。在梁的任一截面中,由于外力的作用,将产生随时間而变化的由混凝土截面承受的内力N_t、Q_t及M_t*(图10)。現仅考虑引起梁截面内法向应力的纵向力N_t及力矩M_t。为推导公式方便起見,设内力N_t及M_t作用在梁截面混凝土部份的重心轴上。
(2) General formula for the influence of creep and shrinkage of concrete in the section of reinforcing steel bars Now we will discuss the beams with single-sectioned reinforcement in section and under the action of external force changing with time in any law. In either section of the beam, due to external forces, internal forces N_t, Q_t and M_t * (Figure 10) due to the cross-section of the concrete will develop over time. Considering only the longitudinal force N_t and the moment M_t which cause the normal stress in the beam cross section. For the convenience of deriving the formula, let the internal forces N_t and M_t act on the center of gravity axis of the concrete section of the beam section.