结合佛开高速公路北江大桥北引桥7跨连续梁和南引桥6跨连续梁的顶升改造工程,介绍了以解联后的桥型、内力和变形为解联较优方案的三要素,针对南北引桥分别提出4种解联方案,进行了此三要素的对比分析,确定了最优方案并给出了解联具体施工过程,为今后类似工程提供参考。

Combining with the project for lifting and reconstructing the seven span continuous bridge of the north ap -proach and six span continuous bridge of the south approach in Beijiang Bridge of Fokai Expess Highway ,the bridge style ,internal force and deformation are introduced as the three factors for choosing the better contact-removing scheme of the bridge .At the same time ,four schemes are put forward to the north and south approach bridge respectively ,and the compares and analyses are made for the three factors .In the end ,the better scheme and construction process about the cantact-removing of the bridge are given so as to provide references for the similar projects in the future .

佛开高速公路北江大桥采用主桥拆除重建、引桥顶升加固的改造方案。由于引桥连续工字梁存在结构性病害,顶升对梁体的影响需进行评估。同时,顶升误差将导致梁体产生次应力,可能导致梁体出现新的损伤,此外,顶升过程中连续工字梁的结构体系多次发生转换,多次体系转换后梁体的受力性能是否满足要求需进行分析。对北江大桥引桥连续工字梁的典型联跨改造前后的受力性能进行分析,得到其受力性能的变化规律,为桥梁改造施工提供理论依据。

Demolition and reconstruction have been implemented for the main bridge of Beijiang Bridge, jacking and reinforcing method have been designed for the approach bridges. Due to existing structural disease of the continuous I-beams, the effect of lifting to the beams has to be evaluated. At the same time, lifting error may lead to secondary stress of the beams, which may cause new damages; in addition, as many conversions of the continuous beams have occurred during the jacking process, it has to be analyzed that if the stress properties of the beams could meet the requirements after several times of system conversions. By studying on stress properties before and after the reinforcing of the typical combination of continuous I-beams of Beijiang Bridge, the change law of the stress properties has been obtained, which will provide theoretical basis for the bridge construction.

以实际工程为背景，介绍哈大铁路普兰店海湾特大桥主桥简支箱梁节段湿接法施工方法，南京长江四桥北引桥划子河以南引桥箱梁节段胶接法施工方法，并对2种施工工艺流程进行总结，分别从施工周期、外观、经济性和实用性方面对2种施工方法进行比较。

Taking a practical engineering proj ect as reference,wet connection construction method of simply supported box beam segmental of Pulandian Gulf large Bridge in Harbin-Dalian railway is in-troduced,and the Huazi River south terminal bridge box beam segmental cementing construction method of the north bridge approach in the 4th Nanjing Changjiang River Bridge is also introduced. The two kinds of construction process are summed up and compared from the aspects of construction period,appearance,economy and practicability,and provides experience for the similar bridge con-struction.

以一座主跨908 m 的多塔斜拉桥为研究背景，建立全桥动力计算模型，分析了行波效应下该结构常规体系与减隔震体系的地震响应，结果表明：①对于常规体系，行波效应会增大上桥塔内力，但采用拉索减震支座的减隔震体系具有较好的减震率；②考虑行波效应对桥墩抗震有利，而减隔震体系会进一步降低桥墩内力；③减隔震体系可以将主桥支座位移控制在要求范围内，对于引桥，考虑行波效应时，支座位移增大明显，也建议采用拉索减震支座；④行波效应下，主-引桥相对位移增大，建议在主-引桥间设置连梁装置和缓冲装置，以提高抗震性能。

A nonlinear three-dimensional finite element model was established for a multi-pylon cable-stayed bridge.Seismic response analyses of the bridge under excitations considering the travelling wave effect were conducted for both the Conventional System (CS)and the Seismic Isolation System (SIS).The results show that:(1 )For the CS,the traveling wave effect can significantly increase the internal force of upper tower bot-tom;but the SIS that uses the CSFAB has a decreasing amplitude ratio;(2)Sesismic responses of the pier decrease at the loading cases considering the traveling wave effect and the SIS can further reduce the pier forces;(3)Bearing displacement of the approach span increases obviously under traveling wave effect;there-fore,the CSFAB is recommned to be adopted;(4)The relative displacement between the main spane and ap-proach span was further enlarged under the traveling wave effect.Therefore,it is suggested that restrain de-vices and bumper devices should be set up at this pla

沱江一桥复线桥北引桥为双幅分离式连续梁，周边环境和地形条件复杂。利用桥位处原沱江一桥及房建工程的建筑结构，因势利导，降低施工影响，方便进行现浇施工。

The north approach bridge of Tuojiang first bridge with complex line is double separate continuous beam, which has complex peripheral environment and terrain conditions. By using the original Tuojiang bridge and the construction structu-re of housing project, and the favorable terrain to reduce the construction effect, and carries on the cast-in-situ construction conveniently.