为合理确定高墩大跨连续刚构桥中跨合龙的顶推力,基于力法原理提出一种适用于单柱式墩连续刚构桥先边跨后中跨合龙的顶推力解析计算方法。以某三跨连续刚构桥施工工程为例,应用解析法计算先边跨后中跨合龙的顶推位移和顶推力,同时利用数值模拟法建立有限元模型,以消除5 年收缩徐变及合龙温差引起的墩顶水平位移为原则进行计算比较,并以工程实测结果进行验证。结果显示,解析法计算值、有限元计算值和实测值三者之间误差很小,解析法与有限元法计算误差小于10%,表明解析法具有较高的计算精度,能满足实际工程要求。
In order to determine the jacking force of middle span closure for the high-pier and long-span continuous rigid frame bridge reasonably, an analytical method for jacking force of continuous rigid frame bridge with single pier under closure sequences is developed based on the force method. Taking the construction work of a three span continuous rigid frame bridge as an example, the jacking force and displacement of the middle span closure are calculated by the analytical method, then numerical simulation method is applied to establish the finite element model. The jacking force and displacement are calculated and compared with the principle of eliminating the horizontal displacement of pier top caused by the five-year shrinkage and creep of concrete and closure temperature difference. Monitoring records in practical engineering have shown that the calculating results by the proposed analytical method are basically the same as those by the finite element method (FEM) and the real measurements, and that the error between calculating results by the analytical method and FEM is less than 10%, which indicates that the analytical method has a relatively high calculation accuracy and can meet the requirement of practical engineering.
[1] 项海帆. 高等桥梁结构理论[M]. 北京: 人民交通出版社, 2001. Xiang Haifan. Structural theory of higher bridge[M]. Beijing: China Communications Press, 2001.
[2] 刘昌国, 殷灿彬. 连续刚构桥高温合龙顶推力的分析与试验研究[J]. 公路工程, 2009,34(5): 83-86. Liu Changguo,Yin Canbin. Analysis and experiment on jacking force with high temperature closure for continuous rigid frame bridge[J]. Highway Engineering, 2009, 34(5): 83-86.
[3] 许明雷, 罗力军. 排调河一号特大桥中跨合龙顶推控制[J]. 桥梁建设, 2011,79(4): 79-82. Xu Minglei, Luo Lijun. Control of pushing for closure of central span of Paidiao River bridge No.1[J]. Bridge Construction, 2011, 79(4): 79-82.
[4] 蒋国云. 大跨连续刚构桥中跨顶推合龙施工技术[J]. 施工技术, 2012, 41(3): 38-40. Jiang Guoyun. Jacking construction technology of middle span closure of long span continuous rigid frame bridge[J]. Construction Technology, 2012, 41(3): 38-40.
[5] 陈洪彬, 陈群, 王斐, 等. 大跨度连续刚构桥合龙顶推效应分析及方案设计[J]. 公路, 2009, 7(7): 209-211. Chen Hongbin, Chen Qun, Wang Fei, et al. Jacking effect analysis and scheme design of long span continuous rigid frame bridge[J]. Highway, 2009, 7(7): 209-211.
[6] 张刚刚, 吴重男. 连续刚构桥合龙段顶推力设计探讨[J]. 中外公路, 2011, 31(5): 119-123. Zhang Ganggang, Wu Zhongnan. Discussion on the design of jacking force of closure of continuous rigid frame bridge[J]. Journal of China & Foreign Highway, 2011, 31(5): 119-123.
[7] 马卫华, 孙全胜. 连续刚构桥非高温顶推合龙试验分析[J]. 低温建筑技术, 2011, 33(4): 83-85. Ma Weihua, Sun Quansheng. Jacking test analysis with non high temperature continuous rigid frame bridge[J]. Low Temperature Architecture Technology, 2011, 33(4): 83-85.
[8] 陈荣刚. 六跨连续刚构组合梁桥合龙方案研究[J]. 公路交通科技, 2014, 31(7): 91-96. Chen Ronggang. Study on closure scheme of six-span continuous rigid frame composite girder bridge[J]. Journal of Highway and Transportation Research and Development, 2014, 31(7): 91-96.
[9] 杨庆国, 唐瑞. 非常规合龙顺序对连续刚构桥影响分析[J]. 公路工程, 2015, 40(1): 133-136. Yang Qingguo, Tang Rui. The influence study of unconventional closure method on continuous rigid frame bridge[J]. Highway Engineering, 2015, 40(1): 133-136.
[10] 邹毅松, 单荣相. 连续刚构桥合龙顶推力的确定[J]. 重庆交通学院学报, 2006, 25(2): 12-15. Zou Yisong, Shan Rongxiang. The confirmation closure jacking force of continuous rigid frame bridge[J]. Journal of Chongqing Jiaotong University, 2006, 25(2): 12-15.
[11] Soyluk K. Comparison of random vibration methods for multi-support seismic excitation analysis of long-span bridges[J]. Engineering Structures, 2004, 26 (11): 1573-1583.
[12] Nuti C, Vanzi I. Influence of earthquake spatial variability on differential soil displacements and SDF system response[J]. Earthquake Engineering & Structural Dynamics, 2005, 34(11): 1353-1374.
[13] 李廉锟. 结构力学[M]. 北京: 高等教育出版社, 1989. Li Liankun. Structural mechanics[M]. Beijing: Higher Education Press, 1989.
[14] 雒帅. 高墩大跨PC连续刚构桥合龙顶推控制[D]. 长安大学, 2012. Luo Shuai. Jacking Control of closing the PC continuous rigid bridge with high-piers and large-spans[D]. Chang',an University, 2012.
[15] 闫晓宇, 李忠献, 韩强, 等. 多点激励下大跨度连续刚构桥地震响应振动台阵试验研究[J]. 土木工程学报, 2013, 46(7): 81-89. Yan Xiaoyu, Li Zhongxian, Han Qiang, et al. Shaking tables test study on seismic responses of a long-span rigid-framed bridge under multi-support excitations[J]. China Civil Engineering Journal, 2013, 46(7): 81-89.
[16] Sivakumaran K S. Analysis of concrete structure subjected to sustained temperature gradients[J]. Canadian Journal of Civil Engineering, 1984, 1 (3): 404-410.
