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在鋼筋砼铁路桥梁设计中,長期以来未計入荷载偏心作用的影响,而是依赖构造上的措施,例如採用封閉式蹬筋,限制腹欣厚度,缩短横隔版的间距等等,或是在安全系数中考虑这种次应力的影响。随着予应力鋼筋砼梁的发展,钢筋砼結构得以广泛采用高強度材料,因此有向薄壁結构发展的趋势。例如ep=20m普通鋼筋砼梁梁梗(腹版)厚度为24cm(专桥1009),而eP=31.7m予应力钢筋砼梁梁梗厚度只有14cm,如採用予应力蹬筋时尚可减至12cm。因此对由于偏心作用引起扭轉而产生于梁內的附加应力,有进行分析研究的必要。
In the design of reinforced concrete railway bridges, the influence of load eccentricity has not been taken into account for a long time, but instead depends on the structural measures such as the use of closed tendons, the limitation of the thickness of the hinges, the shortening of the spacing of the transverse plates, etc. or The effect of this secondary stress is taken into account in the safety factor. With the development of prestressed reinforced concrete beams, reinforced concrete structures have been widely used in high-strength materials, so there is a tendency to the development of thin-walled structures. For example, ep = 20m general reinforced concrete beam beam stem (ventral) thickness of 24cm (special bridge 1009), and eP = 31.7m prestressed reinforced concrete beam beam stem thickness of only 14cm, such as the use of prestressed tendons fashion can be reduced to 12cm . Therefore, due to eccentricity caused by torsion arising in the beam of additional stress, there is the need for analysis and research.