大比例桥梁模型试验和分析
对一18m长大比例连续刚构桥进行试验，了解其变形、承载力及长期力学行为并进行损伤识别
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基于非线性有限元和快速建模的桥梁承载力预测
兰州交通大学学报, 2009, 28(4): 12-16.
摘要：根据桥梁检测结果，准确、快速地预测桥梁承载力，对桥梁运营和维修具有重要意义。本文对基于非线性有限元软件的桥梁承载力预测技术进行了研究。首先介绍了精细建模技术，并通过大比例模型桥试验，证明了非线性有限元模型的准确性。为解决精细建模过于繁琐的问题，本文又开发了快速建模程序，以提高建模的方便性。最后，介绍了上述桥梁承载力预测技术的工程应用实例。
关键词：桥梁；承载力预测；非线性有限元；高精度；快速建模
预应力高强轻骨料混凝土连续刚构桥的试验研究
工程力学, 24(sup.I), 2007, 134-140.
摘要：强度等级在CL40以上的高强轻质混凝土（HSLWC）应用于大跨度桥梁结构，具有减轻自重，有效降低结构内力，增大跨度，减少桥墩数量等优点。本文以云南安宁至楚雄高速公路14号达连坝段公路桥为原型，按照1/4比例设计了一个3跨预应力高强轻骨料混凝土连续刚构桥，其桥面结构采用CL50混凝土，进行了多种荷载工况的试验研究。结果表明，预应力高强轻骨料混凝土连续刚构桥具有较好的受力性能，1倍和1.5倍等效车队荷载通过时，各项指标均满足规范要求；2倍等效车队荷载通过时，部分指标不满足使用要求，但桥梁表现出了较好的延性；在严重超载情况下，桥梁虽破坏严重，但仍可保持较好的承载力水平且不会发生跨塌。
关键词：刚构桥；模型试验；高强轻骨料混凝土；预应力；残余变形
Nonlinear
finite element analysis for a prestressed continuous rigid frame concrete
bridge
Proc. International Symposium on Computational Mechanics
(ISCM2007), Yao ZH & Yuan MW (eds.), Beijing: Tsinghua University
Press & Springer, July 30-August 1, 2007, Beijing, China, 267 &
CDROM.
Abstract: Bridges in China are always
suffered from the overload traffic. So precise assessment for the safety
of the bridges is important. Nonlinear FE analysis with the consideration
of damage accumulation, material nonlinearity and boundary connection
is a powerful tool for this problem, which is cheaper than test and
more accurate than linear FE analysis. But nonlinear FE analysis for
prestressed concrete bridge in China still has not been widely accepted.
Hence, in this paper, a nonlinear FE analysis for a prestressed continuous
rigid frame concrete bridge is implemented with the comparison of a
large-scale bridge experiment so as to discuss the modeling technique
and to verify the result of numerical model. Nonlinear behaviors such
as prestress, cracks, crush of concrete, yield of rebar and contact
of support are taken into account. Ten different load cases to represent
different overloads are all simulated in both FE model and experimental
model. Through the analysis, it can be concluded that nonlinear FE model
correctly monitor the performance and damage of the bridge.
Key words: bridge, nonlinear analysis, FEA
Large-scale
experimental study on the safety monitoring for continuous rigid frame
concrete bridges
Proc. 2006 International Symposium on Safety Science
and Technology (2006 ISSST), Science Press, Changsha, China, 2278-2283
Abstract: During the service life
of a bridge, it is impossible to avoid damage accumulation and function
degeneration due to traffic load, environmental corrosion and accidental
punch. Hence, the safety monitoring of bridges have been received wide
focus to prevent the sudden fatal accidents. This paper presents a large-scale
experimental study on the safety monitoring for continuous rigid frame
concrete bridges, which has 3 spans and a total length of 18m. Ten different
load steps were tested to simulate different levels of overload, and
curvature mode method was adopted to detect the damage after the load
cases. By monitoring the changes of curvature modes, the damage detection
shows good performance to give the safety situation and the damage position
of the bridge. So it can be concluded that this method could be used
in real structures to guarantee the safety service of the bridges.
Key words: bridge; safety monitoring; damage detection; curvature
mode
大型连续刚构桥梁模型试验及损伤评估
第十七届全国桥梁学术会议论文集，2006.5，重庆: 907-913.
摘 要 桥梁结构在其服役过程中，由于荷载作用和各种环境不利因素的影响，结构不可避免的会产生累积损伤和功能退化，如不及时采取措施，甚至会导致突发事故。因此，对桥梁的工作状态进行实时监控，避免事故发生成为当前研究的一项热点。近年来，随着新型传感技术及通讯技术的发展，桥梁无损检测和健康监测成为研究热点。各种损伤评估理论在桥梁中开始得到应用。本文结合一个18m长3跨大型连续刚构桥梁模型试验，采用动力指纹法，对不同荷载工况下桥梁的损伤情况进行了识别。结果显示可以通过桥梁动力指纹的改变，初步判断其损伤情况，从而监测桥梁的工作状态。
关键词 桥梁 健康监测 动力指纹 损伤识别
钢-混凝土组合梁收缩和徐变的影响分析和计算
建筑结构, 36(sup), 2006, pp: 9-8~11.
摘 要 本文采用纤维模型编制了有限元程序，利用MC90收缩和徐变模型对简支钢-混凝土组合梁在长期荷载作用下的变形进行了分析，计算结果与试验结果相吻合。论文同时对现行规范方法和文献方法进行了分析，现行规范中考虑收缩和徐变的计算方法不全面，且偏于不安全，而文献的其它方法在收缩变形分析中也存在一些不足。为此，本文基于所建议的数值模型对影响组合梁长期变形的收缩和徐变参数进行了分析，并根据徐变和收缩引起的长期变形的机制，建议徐变变形计算采用“有效弹性模量”的换算截面法，收缩变形采用直接法计算，使得计算概念更为合理，且比现有方法与试验结果吻合更好。
关键词 钢-混凝土组合梁 收缩 徐变 纤维模型 长期变形 有效模量
