The present study for flood impact of bridge survivability stress analysis,through the stability of the overall structure of the bridge's stress analysis,without taking into account the various parts of the bridge impact force on the bridge damage,can not improve the performance of the bridge is given to flood rationalization proposals.Put forward a new analysis method for bridge under flood invulnerability,by considering the floods over the deck and deck in either of the following circumstances,the force analysis of the bridge in the horizontal direction and the vertical direction of the key parts of the calculated torque and the corresponding displacement,further for normal and shear stresses and,by the maximum normal stress and shear stress of the comparative analysis on the flood impact under the bridge survivability stress analysis,and the establishment of flood impact analysis to verify the effectiveness of the method of experimental model of bridge survivability by.The experimental results show that the various parts of the bridge force situation is different,have different degree of influence on the survivability of the whole bridge,and is given to improve the survivability of bridge,proved that the method is effective to flood bridge survivability stress analysis results.%目前对于洪水冲击下桥梁抗毁性受力分析的研究,是通过对桥梁整体结构的稳定性做受力分析,没有考虑到桥梁各个部位受力情况对桥梁损毁的影响,无法对桥梁抗洪性能的改进给出合理化建议.该文提出一种新的洪水冲击下桥梁抗毁性受力分析方法,通过考虑洪水漫过桥面和在桥面以下两种情况,分析桥梁在各关键部位的水平方向及竖直方向的受力情况计算出相应的力矩和位移,进一步求得正应力与剪应力,通过与最大正应力和剪应力的比较分析,实现对洪水冲击下桥梁抗毁性受力分析的研究,并建立洪水冲击下桥梁抗毁性受力分析实验模型来验证方法有效性.实验结果表明,桥梁各个部位的受力情况不同,会对桥梁整体的抗毁性产生不同程度影响,并给出了提高桥梁抗毁性能的建议,证明该方法对洪水冲击下桥梁抗毁性受力分析的结果有效.
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