南广铁路桂平郁江特大桥主桥斜拉索索力分析  

Analysis for Cable Force of the Stay Cable of Main Bridge for Guiping Yu River Grand Bridge on Railway from Nanning to Guangzhou

作　　者：陈建峰[1] 郭建勋[1] 余浪[1] 

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《中国科技信息》2011年第9期79-80,共2页China Science and Technology Information

摘　　要：斜拉桥是一种高次超静定结构,索力的大小对结构的受力影响非常大。如何确定斜拉桥的合理索力是斜拉桥设计、施工以及运营中的重要问题。为了使斜拉桥在成桥后达到合理状态,必须拟定合理的施工状态,即在施工过程中使斜拉索力和结构位形同时达到理想状态。本文以桂平郁江钢桁斜拉桥为背景,建立了斜拉桥的施工过程有限元分析模型。通过模拟主梁的悬臂拼装过程,确定了合理的施工安装索力。根据零位移法,以成桥后结构的弯曲应变能和主梁的线形为目标函数,确定了合理的成桥状态索力,并以此索力对结构进行二次调索。结果表明,该方法可有效地控制施工阶段和成桥后的主梁线形和结构内力,从而可确定斜拉桥的合理成桥状态。The cable-stayed bridge is a kind of high-level hyper static structure;the cable force has great impact on the stress of the structure.How to determine the reasonable cable force of the cable-stayed bridge is an important issue during the design,construction and operation for the cable-stayed bridge.In order to ensure the cable-stayed bridge to reach the reasonable condition after the bridge is completed,the reasonable construction state must be prepared,namely,during construction,the stayed cable force and the structural configuration should reach the ideal state simultaneously.This article treats the Guiping Yu River steel truss cable-stayed bridge as the background to establish the finite element analysis model of the cable-stayed bridge during construction.The construction and installation cable force is reasonably determined through simulating the assembly process of the suspension arm for the main girder.Based on the zero displacement method,after the bridge is formed,the bending strain of the structure and the configuration of the main girder are served as the objective function to determine the reasonable cable force under the bridge-forming state,and this cable force shall be employed to perform the cable-adjusting for the second time.The result indicates that this method can effectively control the configuration of the main girder and the inner force of the structure in the process of construction and after bridge forming,thus,the reasonable bridge-forming state for the cable-stayed bridge can be determined.

关 键 词：斜拉桥 合理施工状态 模拟计算 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]