断索对曲线斜拉桥力学性能的影响  

Effect of Broken Cable on Mechanical Properties of Curved Cable-stayed Bridge

作　　者：杨雅勋[1,2] 王成之 柴文浩 张宇航 张富华 YANG Yaxun;WANG Chengzhi;CHAI Wenhao;ZHANG Yuhang;ZHANG Fuhua(School of highway,Chang′an University,Xi′an 710064,China;The Engineering Design Academy of Chang′an University Company Limited,Xi′an 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]西安长安大学工程设计研究院有限公司,陕西西安710064

出　　处：《郑州大学学报（工学版）》2023年第5期101-107,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家重点研发计划资助项目(2018YFB1600300);国家自然科学基金资助项目(51878059)。

摘　　要：为研究大跨径曲线斜拉桥断索产生的力学响应,以甘肃省西固柴家峡斜拉桥为工程实例,采用梁格法建立有限元模型,选取15个典型断索工况,分析了不同位置、不同数量的拉索断裂前后剩余拉索索力、主梁挠度、主梁应力及塔顶偏移的变化。研究结果表明:单索断裂只会产生局部影响,变化峰值出现在断索锚固区附近,并向周围递减,组合断裂工况比单索断裂工况产生的影响更大;长索断裂产生的影响最大,中索次之,短索最小;中跨拉索断裂产生的影响大于边跨;拉索断裂对断裂跨的影响比非断裂跨大,对断索面的影响比非断索面大;断索对主梁峰值应力和全桥应力分布的影响很小,仅对锚固区附近的主梁应力影响较大。In order to study the mechanical response of long-span curved cable-stayed bridge caused by cable breaking,taking Xigu Chaijiaxia cable-stayed bridge in Gansu Province was taken as an engineering example,the finite element model was established by using the beam lattice method,and 15 typical cable breaking conditions were selected to analyze the changes of residual cable force,main beam deflection,main beam stress and tower top offset before and after cable breaking at different positions and different numbers.The research results showed that single cable breaking would only produce local effects,the peak value of the change occurred near the broken cable anchorage zone and decreased to the surrounding.The combined fracture condition had a greater impact than the single cable fracture condition.Long cable fracture had the greatest impact,followed by medium cable and short cable.The impact of cable fracture in the middle span was greater than that in the side span.The influence of cable fracture on the broken span was greater than that of non broken span,and the influence on the broken cable surface was greater than that of non broken cable surface.The effect of cable breaking on the peak stress of the main beam and the stress distribution of the whole bridge was very small,but only on the main beam stress near the anchorage zone.

关 键 词：曲线斜拉桥 断索工况 拉索索力 主梁挠度和应力 塔顶偏移 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]