大跨度连续刚构桥V形墩极限承载力研究

发布时间：2018-06-03 20:45

本文选题：连续刚构桥 + V形墩　；参考：《世界桥梁》2014年06期

【摘要】：奉化江南翔桥为(80+130+80)m双幅三跨V形墩混凝土连续刚构桥,V形墩斜腿采用单箱双室预应力钢筋混凝土箱形结构。为确保该桥通行安全,了解V形墩在运营状态下的实际极限承载力,采用有限元法建立V形墩三维实体非线性模型,定量分析承载能力极限状态及正常使用极限状态下,以允许活载超载系数K为表征的V形墩极限承载力,并结合现场监测数据,对K值进行修正。结果表明:V形墩在截面承载能力极限状态下的允许K值约为9,破坏形态为大偏压破坏;在正常使用极限状态下的允许K值约为6,由截面边缘最大压应力控制;在V形墩的钢筋应力及裂缝宽度限制条件下的允许K值约为6;以V形墩实测的成桥应力代替相应状态下的理论值,修正后的允许K值约为4.9,该桥V形墩在运营状态下的实际极限承载力较高。
[Abstract]:The Jiangnan Xiang Bridge in Fenghua is a concrete continuous rigid frame bridge with V-shaped piers with double spans of 80,130 80m and three spans. The inclined legs of V-shaped piers are single box and double-chamber prestressed reinforced concrete box structure. In order to ensure the safety of the bridge and understand the actual ultimate bearing capacity of V-shaped pier in operation, a three-dimensional nonlinear model of V-shaped pier is established by using finite element method, and the limit state of load-carrying capacity and the limit state of normal use are quantitatively analyzed. The ultimate bearing capacity of V-shaped pier is characterized by the allowable live load overload coefficient K, and the K value is corrected by combining with the field monitoring data. The results show that the allowable K value of the V shaped pier is about 9 under the limit state of section bearing capacity, and the failure mode is large bias failure, and the allowable K value is about 6 in the normal service limit state, which is controlled by the maximum compressive stress at the edge of the section. The allowable K value is about 6 under the condition of the steel bar stress and crack width of V-shaped pier, and the theoretical value of the corresponding state is replaced by the bridge stress measured by V-shaped pier. The corrected allowable K value is about 4.9, and the actual ultimate bearing capacity of the V-shaped pier is higher.
【作者单位】：宁波城市交通建设有限公司;合乐中国有限公司;
【分类号】：U448.23;U441

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