摘要
为确保长期运营拼宽桥的安全,以国道G355线流溪河大桥改造工程为背景,基于该桥病害分布情况和荷载横向分布系数,研究既有拼宽T梁桥连接方式优化方法。提出一种针对长期运营拼宽桥的铰改刚连接方式,即将铰接连接调整为刚性连接并优化横向联系,采用桥梁博士和MIDAS Civil对优化前、后桥梁荷载横向分布系数及内力进行计算。结果表明:病害分布集中程度和荷载横向分布系数大小存在显著对应关系,拼宽连接区域相对较高的荷载横向分布系数导致该区域病害最为集中;该优化方法可显著减小拼宽连接区域主梁荷载横向分布系数峰值及跨中弯矩;铰改刚优化方法应用过程中应注意严选混凝土种类,保障良好施工和养护条件。实际工程应用效果证明了该法在工程实践中具有一定的适用性。
Based on the upgrading project of Liuxihe River Bridge of national highway G355,the long-term operation safety of widened bridge is studied.The deterioration distribution and transverse load distribution coefficient are introduced in the connection optimization analysis of existing widened T-beam bridge.An operation method of transforming the hinge connection to rigid connection for the widened bridge in long-term operation is proposed,namely to adjust the original hinge connection to rigid connection and optimize the transverse connection.The Dr.Bridge and MIDAS Civil were used to calculate the transverse load distribution coefficient and internal forces of the bridge before and after optimization.It is shown that the deterioration concentration is significantly correlated with the transverse load distribution coefficient,bigger transverse distribution coefficient of the widening connection zone resulting in more concentrated deterioration.The method is proved effective in reducing the transverse load distribution coefficient of beams in the widening connection zone and the midspan bending moment.Choosing proper type of concrete and controlling construction and curing condition can ensure the good implementation effect of the method proposed.The engineering practice of Liuxihe River Bridge proves the applicability of changing hinge connection to rigid connection for bridges.
作者
杨忠胜
YANG Zhong-sheng(Guangzhou Road Maintenance Center,Guangzhou 510080,China)
出处
《世界桥梁》
北大核心
2021年第4期106-111,共6页
World Bridges
关键词
拼宽桥
T形梁
荷载横向分布系数
连接方式
刚性连接
有限元法
桥梁改造
widened bridge
T-beam
transverse load distribution coefficient
connection form
rigid connection
finite element method
bridge renovation
