摘要
义城昌江特大桥主桥为(90+200+90)m预应力混凝土连续刚构与钢管混凝土拱组合结构。为确定该桥吊杆张拉顺序,保证吊杆张拉过程结构安全,受力合理,提出了5种吊杆张拉方案:①四分区-拱顶-拱脚交替张拉;②拱脚-拱顶-四分区交替张拉;③从拱脚至拱顶交替张拉;④从拱顶至拱脚交替张拉;⑤先拱脚-拱顶交替张拉再四分区张拉。采用有限元软件MIDAS Civil建立全桥有限元模型,对比分析了5种张拉方案的成桥吊杆力,拱肋混凝土应力,拱肋钢管应力,拱肋位移,拱脚水平推力,主梁应力。结果表明,方案3的成桥吊杆力与设计成桥吊杆力最接近,吊杆张拉阶段拱肋混凝土截面最大拉应力控制得较为合理,运营阶段的拱肋钢管截面压应力最小,拱肋线形较为平顺,拱脚水平推力和主梁应力均呈现较好的线性变化。因此方案3在5种吊杆张拉方案中相对最优。
The main bridge of Yicheng Changjiang Bridge is(90+200+90)m prestressed concrete continuous rigid frame and concrete-filled steel tube arch combination structure.In order to determine the tension sequence of hanger and ensure the structure safety during the tensioning process of hangers,5 types of tensioning schemes are proposed:(1)hangers to be tensioned from quarter section to arch crown to arch springing alternately;②hangers to be tensioned from arch springing to arch crown to quarter section alternately;③hangers to be tensioned from the arch springing of the bridge towards the arch crown alternately;④hangers to be tensioned from the arch crown of the bridge towards the arch springing alternately;⑤hangers to be tensioned from the arch springing of the bridge towards the arch crown alternately followed by the tensioning of hangers in quarter section.The finite element software MIDAS Civil is used to establish the finite element model of the whole bridge.The tension force of hangers,concrete stress of arch ribs,steel tube stress of arch ribs,displacement of arch ribs,horizontal thrust of arch springs,stress of main beam are compared and analyzed in 5 tensioning schemes.The results show that,for scheme 3 specifically,the hanger tensile force in completed bridge stage is the closest to the designed tensile force,the maximum tensile stress of arch rib concrete is relatively rational during tensioning stage,the compressive stress of arch rib steel tube is minimal in service stage,the geometric shape of arch rib is relatively smooth,the horizontal thrust of the arch springs and the stress of the main beam show a good linear variation.Therefore,scheme 3 is relatively optimal among the 5 tensioning schemes.
作者
傅安民
FU Anmin(China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道标准设计》
北大核心
2022年第3期82-88,共7页
Railway Standard Design
基金
中国铁路设计集团有限公司科技开发课题(2019YY320609)。
关键词
铁路桥梁
吊杆张拉方案
数值计算
吊杆
钢管混凝土拱桥
连续刚构拱
高速铁路
railway bridge
tensioning scheme of hanger
numerical calculation
hanger
concrete filled steel tube arch bridge
continuous rigid frame arch bridge
high-speed railway
