基于整体刚度的独塔地锚式PC斜拉桥参数分析  

Parameters analysis of earth-anchored preseressed concrete cable-stayed bridge with single pylon based on totally rigidity

作　　者：赵晓晋 闫磊[2] 侯炜[2] 刘志华[1] 郭文龙[1] ZHAO Xiaojin;YAN Lei;HOU Wei;LIU Zhihua;and GUO Wenlong(Shanxi Key Laboratory of Bridge Engineering Disaster Prevention and Mitigation,Shanxi Transportation Research Institute,Taiyuan 030006,Shanxi Province,P.R.China;Highway College,Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communication,Chang5an University,Xi5an 710064,Shaanxi Province,P.R.China)

机构地区：[1]山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室,山西太原030006 [2]长安大学公路学院旧桥检测与加固技术交通行业重点实验室,陕西西安710064

出　　处：《深圳大学学报（理工版）》2018年第4期377-382,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：陕西省自然科学基金资助项目(2016JM5030)~~

摘　　要：为研究独塔地锚式预应力混凝土斜拉桥参数变化对结构整体刚度的影响,借鉴双塔自锚及部分地锚式斜拉桥塔顶偏位解析计算方法,结合锚索分散和斜塔的结构特点,推导表征结构整体刚度的塔顶水平偏位计算公式,并以某背景工程进行了计算精度验证,分析塔柱倾角、地锚背索倾角、背索截面积和塔柱刚度参数对结构整体刚度的影响.研究表明,与整体刚度逆相关的是塔柱倾角和地锚背索倾角,整体刚度对塔柱倾角更加敏感;与整体刚度正相关的是背索截面积和塔柱刚度,整体刚度对背索截面积的敏感性明显高于塔柱刚度.当结构整体刚度需要调整时,应依次改变塔柱倾角、地锚背索倾角和地锚背索截面积,忽略塔柱刚度的影响.Referencing the analytical calculation method of the pylon top horizontal displacement for double pylon self-anchored and partly earth-anchored cable-stayed bridge and combining the structural characteristics of dispersed cables and inclined pylon,we deduce the calculation formula of pylon top horizontal displacement of the structural integral rigidity in order to obtain the influence of variations of the parameters of single pylon earth-anchored PC cable-stayed bridge on the structure integral rigidity. The calculation precision is verified based on a background project,and the effects of pylon inclination,back cable inclination of anchor,cross section area and pylon rigidity on the integral rigidity are analyzed. The integral rigidity has negative correlation with pylon inclination and back cable inclination of anchor,more sensitive to pylon inclination. And the integral rigidity has positive correlation with back cable cross section area and pylon rigidity,obviously more sensitive to back cable cross section area.Therefore,pylon inclination,inclination and cross section area of back cable should be changed in turn when the integral rigidity needs to be adjusted.Meanwhile,the effect of pylon rigidity should be ignored.

关 键 词：桥梁工程 预应力混凝土 斜拉桥 地锚 整体刚度 塔顶偏位 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]