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北京某景观桥钢结构的检测鉴定与加固设计 总被引:2,自引:0,他引:2
北京某景观桥为新建钢结构人行桥,为保证桥梁投入运营后的长期安全,对该桥进行了检测鉴定以及评估工作,以评定桥梁的实际工作状态,以及桥梁的承载性能与设计的符合程度.此次检测工作采用表观损伤检查、现场静动载试验与有限元建模计算分析相结合的办法.本文介绍了该桥结构检测鉴定的总体流程,首先对桥梁进行了表观检查,以评定桥梁的技术状况,然后对静载试验加载方案进行了设计,包括荷载工况和测点布置,此后进行了标准设计荷载和试验荷载下的桥梁上部结构有限元建模计算,得到了此次静载试验的效率系数、两种荷载下的静力响应以及位移校验系数等重要数据,在此基础上,对静载测试结果进行了理论分析.此外,为进一步验证静载试验结果,还进行了该桥的动载试验,获得了该桥的前几阶自振频率.在前文工作的基础上对该桥进行安全评定,指出该景观桥整体刚度偏弱,且相关指标不能满足规范要求,需要进行加固处理,并提出了加固方案. 相似文献
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尤溪县城关水东大桥是由三种体系的预应力混凝土结构组合而成的新建桥梁,为了解该桥的工作性能状态,交工前我们严格按规程标准对该桥外观和结构进行专项检测.通过特定车辆静止作用于桥梁的最不利荷载位置,以及脉动试验和行车动载试验测定该桥结构的静动力特性、动力效应和使用条件.设计不同的加载工况,检测桥梁最不利截面的变形和受力状态,... 相似文献
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论述了桥梁检测的目的、意义以及基本方法 ,通过孔湾立交桥静载试验和东胡港桥动力试验 2座实桥检测 ,论述了桥梁检测的基本步骤 ,重要检测指标 ,评价桥梁的可靠性 ,为桥梁的安全运营提供保证 相似文献
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本文主要介绍了兰州市新区桥吊杆索力试验的主要内容、方法和结论分析.将吊杆索力试验中桥梁结构的索力进行了对比分析,试验结果表明该调索后吊杆索力处于正常工作状态,满足设计要求,结构安全可靠满足设计及规范要求.该桥的试验方法可为同类型桥梁的检测及状态评估提供参考. 相似文献
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该桥为一座已使用20余年的钢筋混凝土拱桥。为了全面了解该桥现有状况,对该桥进行了无损检测与荷载试验,以期评估现有桥梁状况,判断桥梁的承载能力。通过检测和试验,为该桥是否能够进行扩宽以适应道路扩建的需要提供了依据,同时可供该类现有桥梁的维护使用和加固改造工作借鉴。 相似文献
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以某桁架拱桥为背景,根据相关依据使用检测设备,对桁架拱桥的病害进行检查,通过桥梁无损测试以及桥梁荷载试验来判断本桥承载能力,荷载试验表明该桥承载能力满足要求,并对拱片出现病害进行评估分析,提出维修措施。 相似文献
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《四川建筑科学研究》2015,(3)
大凫线K4+062特大桥是一座103跨的特大桥梁,距今已有20年的历史。为了确认其目前状况,对该桥损伤检测和荷载试验的全过程进行了概述以及分析讨论:首先通过桥梁表观损伤检测来鉴定桥梁结构的完整性和技术状况;然后通过材料检测和构件测量获得现有桥梁结构的参数;此后根据之前的检测结果建立桥梁的计算模型并进行了相关计算分析;并且为了验证在役桥梁与设计状况符合程度并测定桥梁在运营荷载下的状况,进行了机车静动载试验,对测得的桥梁静动力响应参数进行比较分析。最后,在前述工作基础上对该桥做出了安全性评定分析并给出了一系列处理方案。 相似文献
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对钢管混凝土系杆拱桥实施了常规检测和动、静载试验,并结合有限元建模与分析;最终对桥梁进行了安全评估,为桥梁的日常养护维修提供了依据。从荷载试验结果看,桥梁的各项检测指标符合试验规程要求,即当前尚满足设计荷载等级;但由于该桥的结构特点,针对现存的安全隐患,应立即组织维修。 相似文献
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Proof load testing for bridge assessment and upgrading 总被引:1,自引:0,他引:1
Bridge deterioration with time and ever increasing traffic loads raise concerns about reliability of aging bridges. One of the ways to check reliability of aging bridges is proof load testing. A successful proof load test demonstrates immediately that the resistance of a bridge is greater than the proof load. This reduces uncertainty in the bridge resistance and so increases the bridge reliability. The paper considers a reliability-based calibration of intensities of proof loads for aging bridges to verify either an existing or increased load rating taking into account possible bridge deterioration. Intensities of proof loads are calibrated based on a consistent target reliability index. The influence of test risk, dead to live load ratio, and uncertainties associated with dead and live loads and bridge resistance is considered. The results presented in the paper relate to short and medium span bridges. 相似文献
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钢管混凝土在桥梁工程中的应用与前景 总被引:3,自引:0,他引:3
钢管混凝土(CFST)具有承载力高、施工方便和抗震能力好等优良性能,在国内外桥梁工程中得到较为广泛的应用。全面地总结了钢管混凝土结构在梁式桥、拱桥、斜拉桥等多种桥型中的应用情况,并着重探讨了钢管混凝土桥墩的研究和应用现状。介绍了"部分钢管混凝土"桥墩的试验结果。探讨了钢管混凝土结构应用于桥梁工程中还有待解决的主要问题。最后对钢管混凝土在桥梁工程中的应用前景作了展望。 相似文献
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本文对大跨系杆拱桥荷载试验方案及其计算进行了分析。首先,对桥梁荷载试验原理做了简要介绍,又以某大跨系杆拱桥为依托,对具体的静载试验和动载试验具体方案做了阐述;最后,采用Midas Civil有限元计算软件对静载试验及动载试验相关指标进行了初步分析。结合具体的试验结果,即可实现对桥梁承载力、裂缝、刚度及动力特性的评定。本文为同类桥梁的评定提供了依据,具有一定的工程实践意义。 相似文献
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An experimental study on after-fracture redundancy of continuous span two-girder bridges 总被引:1,自引:1,他引:0
This paper presents the results of an experimental test and numerical analysis of the after-fracture redundancy of two-girder
continuous span bridges. Two test specimens that are commonly composed of two steel-plate girders and concrete deck have a
fractured section in one of the two girders, which is artificially set up by making an entire cut along the web and bottom
flange of the girder. To demonstrate the effect of bottom lateral bracings on the after-fracture redundancy of two-girder
bridge system, one of the two test specimens includes a lateral bracing system between the girder bottom flanges but the other
does not. The bend-loading test was conducted on the bridge specimens up to the collapse state. The test results revealed
that the ultimate bending behaviors of the bridge specimens are considerably different from each other and the load carrying
capacity could be increased as much as 20% when the bottom lateral bracings are installed. The numerical analysis of the test
specimens indicates that the bottom lateral bracings play a substantial role in the load redistribution process from the severely
fractured girder to the intact girder, making a considerable contribution to the load-carrying capacity of the after-fracture
two-girder bridges. In the last part, the after-fracture redundancy was quantitatively evaluated for a prototype example bridge
and some conclusions were drawn. 相似文献
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Existing open-steel-plate-girder (OSPG) railway bridges in Korea are so old that they can no longer provide the desired ride quality when trains pass over them due to loss of integrity. In addition, existing bridges do not have ballast, thus impacts from passing trains are delivered directly to piers and abutments. The damage that accumulated is one of the main causes of cracks in pier concrete. To cure this problem, replacement of the existing bridges is required. However, since they are still in service, conventional construction methods cannot be used for their replacement. A new method is necessary to quickly replace the existing bridges in a way that does not disturb the existing train schedule. In this study, a new accelerated-replacement method is proposed using a newly developed crane-vehicle which possesses cranes able to lift a replacement bridge, and which is able to travel on existing train tracks. This study also addresses the design and manufacture of a new bridge deck appropriate for accelerated-replacement construction. Finite element analyses and experimental tests were conducted to estimate the performance of the new bridge deck. The analyses included a static load case and dynamic analysis at various train speeds. The experimental tests included static loading and modal tests to capture the fundamental natural frequency and damping ratio of the bridge deck, and a dynamic amplification test. The results of this study can be used for practical replacement of aged existing open-steel-plate-girder bridges and to improve the integrity and ride quality of railway bridges in Korea. 相似文献
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