基于裂缝控制的连续刚构桥合理合龙顶推力
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摘要
为防止顶推力过大导致结构开裂,基于顶推过程中和正常使用时顶推力和墩底裂缝的关系,以墩底混凝土裂缝宽度不超限为控制条件确定顶推力的上下限值为约束条件,将合理顶推力的求解问题转化为线性规划问题,得出顶推力求解公式。通过沮河大桥实例验证,顶推力计算方法可保证顶推力的作用,且顶推力不会使墩底裂缝宽度超限。
In order to prevent structure crack caused by excessive jacking force,based on the relationship between jacking force and cracks at pier bottom during jacking process and normal operation,taking the crack width of concrete at pier bottom not exceeding the limit as the control condition and the upper and lower limit values of jacking force not exceeding the limit as the constraint condition,the problem of solving reasonable jacking force was then transformed into a linear programming problem,and the solution formula for jacking force was then obtained.Through the example verification of the Juhe Bridge,it can be concluded that the calculation method of jacking force can ensure the effect of jacking force and it will not make the crack width of the pier bottom exceed the limit.
In order to prevent structure crack caused by excessive jacking force,based on the relationship between jacking force and cracks at pier bottom during jacking process and normal operation,taking the crack width of concrete at pier bottom not exceeding the limit as the control condition and the upper and lower limit values of jacking force not exceeding the limit as the constraint condition,the problem of solving reasonable jacking force was then transformed into a linear programming problem,and the solution formula for jacking force was then obtained.Through the example verification of the Juhe Bridge,it can be concluded that the calculation method of jacking force can ensure the effect of jacking force and it will not make the crack width of the pier bottom exceed the limit.
引文
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[15]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.
[2]周光伟,陈德良,刘榕.连续刚构桥合龙温度的合理确定及高温合龙对策[J].长沙交通学院学报,2006,22(3):15-19.
[3]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.
[4]殷灿彬,王解军,唐灿.连续刚构桥合龙顶推力的计算方法研究[J].中南林业科技大学学报,2009,29(1):111-119.
[5]何财基.大跨径连续刚构桥合龙段顶推施工技术[J].铁道建筑,2012(3):20-22.
[6]李杰,陈彬.连续刚构桥顶推力计算与优化分析[J].郑州大学学报(工学版),2013,34(6):85-89.
[7]栾坤鹏,张雪松,高洪如.连续刚构桥合龙顶推力优化计算方法[J].鲁东大学学报(自然科学版),2011,27(1):92-96.
[8]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):209-211.
[9]李传习,王琛,董创文,等.基于相位变换的顶推曲梁桥自适应无应力构形控制[J].中国公路学报,2014,27(2):45-53.
[10]赵人达,张双洋.桥梁顶推法施工研究现状及发展趋势[J].中国公路学报,2016,29(2):32-43.
[11]魏建斌,魏家乐,马玲.高墩大跨连续刚构桥顶推合龙控制技术研究[J].世界桥梁,2014(4):39-43.
[12]梁勇旗.高墩多跨连续刚构桥合龙方案及合龙顶推力计算研究[J].公路,2016(8):116-119.
[13]魏明亮.大跨径连续刚构桥合龙顺序及顶推力研究[D].西安:长安大学,2013.
[14]周伟,胡铁山,赖敏芝.四跨连续刚构桥合龙顶推力计算与效应分析[J].交通科技,2014(3):20-23.
[15]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.