摘要
针对连续钢-混叠合梁桥墩顶区桥面板,在非荷载因素作用下受拉易产生裂缝,采用支座强迫位移法解决上述问题。为研究支座强迫位移法对叠合梁桥负弯矩区桥面板产生的预压应力效应,以武汉二七长江大桥汉口侧6×90 m连续钢-混叠合梁桥为研究对象,对传统的支座强迫位移法进行了改进,同时利用ANSYS的APDL语言建立大型"梁-壳-实"有限元混合模型,并对其进行局部仿真分析和实测。理论和实测值均表明,改进的支座强迫位移在负弯矩区桥面板中产生了足够的预压应力储备,最大压应力大小为18.5 MPa。在此基础上,将其与传统方案进行对比分析,得出改进方案在负弯矩区桥面板中多产生0.41～0.46倍压应力储备,为今后超大跨连续钢-混叠合梁桥的设计与施工提供参考。
The decking on the top of bridge pier of the continuous steel-concrete composite beam is easily cracked by the action of non-load factors. The support forced displacement method is one of the effective methods to control or slow down the crack. To discuss the pre-compressed stress effect of the forced displacement method in the negative bending moment area of the decking of the composite beam bridge, taken the 6 x 90 m continuous steel-concrete composite beam bridge at Hankou side of Erqi Changjiang River Bridge as research object, the improvement on traditional support forced displacement method was conducted. Besides, a local simulation analysis was accomplished on the basis of a hybrid finite element model of large ＂beam-shell-solid＂ which was established through APDL of ANSYS. A conclusion drawn from the theoretical and measured values shows that enough pre-eompressed stress reserves, the maximum compressive stress of which was 18.5 MPa, was produced in the ,decking of the negative moment area by the improved support forced displacement method. On this basis, the pre-compressed stress reserves by the improved method gained more than 0. 41 -0. 46 times in the negative moment area on bridge decks. This study provided a reference for design and construction of super long-span continuous steel-concrete composite beam bridge.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第6期53-59,共7页
Journal of Highway and Transportation Research and Development
基金
教育部博士点基金项目(20103204120007)
关键词
桥梁工程
叠合梁
负弯矩区桥面板
有限元混合模型
支座强迫位移
bridge engineering
composite beam
decking of negative bending moment area
hybrid finiteelement model
support forced displacement
作者简介
李继兰（1985-），女，云南南涧人，硕士研究生．（happylijilan@126．com）
