摘要
为进一步优化异形钢箱拱塔施工及安装方法,以某异形斜拉桥中采用的双肢非一致倾斜拱形桥塔为工程案例,考虑支架对结构线形的影响,分析了桥塔施工过程线形变化。针对钢箱桥塔内部板件变化复杂且规律性低、传统建模方法效率低下的问题,使用插值原理生成坐标并对号入座到节点逻辑编号,节点逻辑编号中自带单元信息,单元可以通过循环快速生成,形成了复杂钢箱结构快速建模方法;针对传统正装法在计算闭环结构时常发生的单元畸变导致算法不收敛现象,将无应力状态法与正装法相结合,解释了传统正装方法失效的原理,提出一种改进的闭环结构施工过程模拟的分析方法——无应力正装法,运用该方法分析了支架上的闭环结构施工过程中的3种线形方案,以合龙为目标精确计算了主塔结构在施工过程中的三向控制线形,顺桥向、横桥向和竖向最大变形分别为16,2 cm和9 cm,两肢间三向线形偏差分别为5,3.5,5 cm,同时计算了桥塔节段的安装线形,作为实际桥塔施工安装的重要定位依据,安装线形最大矢量位移值为2.8 cm,最终节段安装线形恰好落在零位置处,实现了合龙段的零偏差安装。无应力状态法在异形钢箱拱塔施工过程线形控制中的应用展示了其在保证施工精度和效率方面的优势,给桥塔安装提供了重要的定位基准。
To provide the reference for prefabricated steel box arch pylon installation,this study took the double limbs non-uniform inclined arch bridge pylon used in the special-shaped cable-stayed bridge as engineering case.Considering the influence of support on the structural alignment,the bridge pylon geometry variation during construction was analyzed.To address the issues of complex and irregular variations in internal plates of steel box bridge pylons and the inefficiency of traditional modeling methods,the coordinates were generated by using the interpolation principle and matched to node logical numbers,which inherently included element information.This formed the fast modeling method for complex steel box structures.Additionally,the traditional forward iterative methods often cause non-convergence when calculating closure structures due to element distortion.This study explained the failure principle of traditional methods,and proposed the unstressed forward method(USFM) combining with the stress-free method with the forward method.By using this method,3 alignment schemes in the construction process of ring-closure structures on supports were analyzed.For precise closure,the three-dimensional geometry of main pylon structure during construction was accurately calculated.The maximum deformation along bridge direction,across the bridge direction,and vertical value are 16,2,9 cm respectively.The three-dimensional geometry deviations between limbs are 5.0,3.5,5.0 cm respectively.The installation alignment of pylon sections is also calculated,serving as the crucial positioning basis for the actual construction and installation of bridge pylon.The maximum vector displacement of installation alignment is 2.8 cm,ensuring that the final segments installation alignment falls precisely at the zero position,enabling zero-deviation installation of the closure segment.The application of stress-free state method in the geometry control of special-shaped steel box arch pylons demonstrates its advantages in ensuring construction
作者
杨小波
韩旭
YANG Xiao-bo;HAN Xu(CCCC First Highway Engineering Group Co.,Ltd.,Beijing 100024,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2024年第7期118-125,共8页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
施工过程模拟
线形分析
无应力状态
闭环结构
快速建模
bridge engineering
construction process simulation
geometry analysis
stress-free state method
ring-closure structure
quick modeling
