非对称施工连续刚构桥合龙优化研究

发布时间：2018-06-12 05:03

本文选题：连续刚构桥 + 非对称施工　；参考：《长安大学》2015年硕士论文

【摘要】：连续刚构桥在国内得到了广泛的应用。对于修建在山区峡谷地区的连续刚构桥,由于受到地貌限制,主梁边中跨比不得不做的异于普通桥梁,桥跨常常设置成不对称的形式。跨径不对称会造成桥墩上T构两边梁段数量不一致,这样的连续刚构桥常常采用非对称施工,合龙顺序也会有所不同。云南省普宣高速公路小湾大桥是一座典型的采用非对称施工的连续刚构桥,边跨比中跨多出两个梁段,本文立足于非对称施工的连续刚构桥小湾大桥,采用桥梁结构专用分析软件MIDAS/Civil对施工过程进行模拟,对比分析了两种非对称施工方法,进行了合龙优化研究,并拟合出顶推力的实用计算公式。本文的主要研究内容有:⑴针对边跨多出梁段的非对称施工,对比分析了两种非对称施工方法,方法一为在中跨配重、非对称浇筑边跨多出梁段,方法二为先中跨合龙后再非对称浇筑边跨多出梁段。从主梁应力、主梁线形、桥墩内力和墩顶位移四个方面对两种方法进行了对比分析。⑵针对先边跨后中跨和先中跨后边跨两种不同合龙顺序,从主梁应力、主梁线形、桥墩内力和墩顶位移四个方面进行了对比分析。⑶针对温度变化对主梁应力和主梁线形的影响,以系统升温为例,分析了两种不同合龙顺序下系统温差效应的差异。⑷针对混凝土收缩、徐变对桥梁施工过程和成桥状态的影响,分析了收缩、徐变对主梁应力和主梁线形的影响,并比较了两种不同合龙顺序的收缩、徐变效应。⑸针对连续刚构桥在合龙时要进行顶推,阐述了计算顶推力的有限元方法。由MATLAB线性拟合出由合龙温差计算顶推力的实用计算公式。国内外有不少采用非对称施工的连续刚构桥,但是相关的文献却很少。通过本文对非对称施工连续刚构桥的详细对比分析,得到的结果可以为同类桥梁的设计和施工提供很好的参考。
[Abstract]:Continuous rigid frame bridge has been widely used in China. For the continuous rigid frame bridge built in the mountain canyons, due to the geomorphological constraints, the ratio of middle to middle span of the main beam is different from that of the ordinary bridge, and the bridge span is often set in an asymmetric form. The dissymmetry of span will result in the different number of beams on both sides of T structure on the pier. Such continuous rigid frame bridge is often constructed by asymmetric construction, and the closure sequence will be different. Xiaowan Bridge of Puxuan Expressway in Yunnan Province is a typical continuous rigid frame bridge with asymmetric construction. The construction process is simulated with Midas / Civil, a special analysis software for bridge structure, two asymmetric construction methods are compared and analyzed, the optimization of closure is studied, and the practical calculation formula of thrust is fitted out. The main research contents of this paper are as follows: 1. Two asymmetric construction methods are compared and analyzed in view of asymmetric construction of multi-beam section with side span. The second method is that the middle span is closed and then the asymmetric casting edge span is more than the beam section. From four aspects of the stress of the main beam, the shape of the main beam, the internal force of the pier and the displacement of the pier top, the two methods are compared and analyzed .2 aiming at the two different closure sequences of the first span and the second span and the first middle span and the second side span, from the main beam stress, the main beam line shape, In view of the influence of temperature change on the stress and alignment of the main beam, the internal force of the pier and the displacement of the pier top are compared and analyzed in this paper. The temperature rise of the system is taken as an example. This paper analyzes the difference of system temperature difference effect under two different closure sequences. 4. Aiming at the influence of concrete shrinkage and creep on the bridge construction process and bridge state, the effects of shrinkage and creep on the stress of the main beam and the shape of the main beam are analyzed. This paper also compares the shrinkage of two different closure sequences. The creep effect of 5. 5 is a finite element method to calculate the thrust of the continuous rigid frame bridge. A practical formula for calculating the top thrust from the temperature difference of the closure is fitted linearly by MATLAB. There are many continuous rigid frame bridges with asymmetric construction at home and abroad, but there are few related documents. Through the detailed comparison and analysis of asymmetric continuous rigid frame bridges, the results obtained can provide a good reference for the design and construction of similar bridges.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23

【参考文献】