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铁路桥梁设计中,常遇到偏心受压矩形截面钢筋混凝土构件,如矩形截面挖孔桩、小截面矩形墩等。荷载系反复作用,其纵向力和横向力一般较大,或有扭矩的作用,同时为了便利施工,截面的钢筋多用对称四边布置,如图1示。图中Ag、As为对称于x、y轴的钢筋截面积。在斜偏心外力N作用下(N的作用点不在截面对称轴上),构件的强度计算较为复杂。为配合电子计算机的运算,在学习《铁路标准设计通讯》1976年12期“矩形截面应力重分布算式的推导”一文基础上,推导其计算公式。在轴偏心外力作用下,以往多近似按对称双筋钢筋混凝土矩形截面轴偏心受压构件进行强度计算,即图1中Ag、As钢筋不同时计算。
In the design of railway bridges, often encountered eccentric compression rectangular cross-section reinforced concrete members, such as rectangular section digging pile, rectangular cross-section of small piers. Load repeatedly, the longitudinal force and transverse force are generally larger, or have the role of torque, and at the same time in order to facilitate the construction, the cross-section of the reinforcement with symmetrical four sides layout, shown in Figure 1. In the figure, Ag and As are symmetrical to the cross-sectional area of the steel bars in the x and y axes. Under the action of oblique eccentric external force N (the action point of N is not on the axis of symmetry of section), the calculation of the strength of the component is complicated. In line with the computing of electronic computer, based on the article “Derivation of Stress Re-distribution Formula of Rectangular Section” of “Railway Standard Design and Communication”, 1976, the calculation formula is deduced. Under the action of eccentric shaft external force, in the past, the strength was calculated according to the eccentric compression member with symmetrical double-section reinforced concrete rectangular section shaft, which is not calculated in Fig. 1 at the same time.