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对于小半径曲线梁桥,支承的布置影响其上下部结构的受力。支承的合理布置能使上下部结构受力更为合理,同时确保结构整体稳定性。以重庆某高速公路互通匝道桥工程实例,运用结构分析软件Midas Civil分析不同支承条件下支反力与结构内力。结合《公路钢筋混凝土及预应力混凝土桥涵设计规范》中关于抗倾覆稳定系数的公式,验算不同支承条件下的抗倾覆稳定系数,并提出小半径曲线梁桥抗倾覆相关的工程措施。
For small radius curve bridges, the placement of the support affects the forces on the upper and lower structures. The reasonable arrangement of the support can make the stress on the upper and lower structures more reasonable while ensuring the overall stability of the structure. Taking a freeway interchange ramp project in Chongqing as an example, the structure analysis software Midas Civil was used to analyze the reaction force and internal forces under different support conditions. Combining with the formula of anti-overturning stability coefficient in Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts, the stability coefficients of anti-overturning under different support conditions are calculated and the engineering measures related to anti-overturning are proposed.