施工方案中途改变的无背索斜拉桥监控方法  

Construction Control for Cable-stayed Bridge with No Backstays Subjected to Temporary Construction Scheme Change

作　　者：王晓明[1] 郝宪武[1] 白絮[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《施工技术》2013年第11期85-87,共3页Construction Technology

基　　金：陕西省交通科技项目(07-06K)

摘　　要：无背索斜拉桥是高次超静定自平衡体系,塔、梁内力与线形相互耦合,斜拉索拉力之间存在相干性。施工方案中途改变后,监控方案调整分析繁琐且计算量大,很难再满足目标成桥状态。引入无应力状态量,指出无应力状态控制法在施工方案改变时的自适应性,采用弹性悬链线法计算无应力索长,解决了上述难题。工程应用表明,该方法简单、快捷,能够达到预定的目标状态。Cable-stayed bridge without backstays is a high-order statically indeterminate structure,which maintains balance by self-equilibrium with the tower beams.The internal force of the tower beam is coupled with the cable shape and the tension forces of the cables are mutually influencing.When the construction scheme is changed during the construction process,adjustment analysis to the monitoring scheme is tedious with a huge amount of calculations and it is very difficult to achieve the target bridge state.In this paper,a stress-free state parameter is introduced.It is pointed out that using the stress-free state control method has the benefit of self-adaptability during construction scheme change.The elastic catenary method is employed to calculate the stress-free cable length.The engineering application shows that the proposed method can achieve the predetermined target state simply and conveniently.

关 键 词：桥梁工程 斜拉桥 无应力状态控制法 监控 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]