The swelling-shrinkage deformation of the main girder of the integral abutment bridge caused by the ambient temperature leads to the horizontal reciprocating motion of the abutment and the interaction between the abutment-soil and the pile-soil. In this paper, based on the case study of an integral abutment bridge, a quasi-static test of low-cycle reciprocating displacement load of integral abutment-H-shaped steel pile-soil system based on diurnal temperature and seasonal temperature deformation effect was carried out to analyze the hysteretic behavior, skeleton curve and abutment angle of the specimens. The results show that the annual hysteretic curve of the specimen can be regarded as the superposition of the hysteretic curves of seasonal temperature and diurnal temperature effects. From the point of view of seasonal temperature effect, affected by the temperature rise in spring and summer, the MTS horizontal force increases rapidly at first. With subsequent continuous temperature rise, the horizontal force growth slows down. Under the influence of continuous temperature drop in summer and autumn, autumn and winter, the horizontal force decreases sharply at first, before decreasing slowly as the temperature continues to drop. Affected by the temperature rise in winter and spring, the horizontal force first increases sharply before slowing down. Its growth rate is similar to that of the first temperature rise in spring and summer. Due to the cumulative effect of the soil behind the abutment, the horizontal force is even greater. From the point of view of the effect of diurnal temperature, when the ambient temperature is high（in summer）, the effect of temperature drop at night on the interaction of the system is greater than that of temperature rise during the daytime. When the ambient temperature is low（in winter）, the effect of daytime temperature rise on the system interaction is greater than that of nighttime temperature drop. From the perspective of skeleton curve, due to the influence of medium and long-term ambient temperature, a process of nonlinear to linear transformation exists in the interaction of integral abutment-pile-soil system. In the initial stage of loading, the rotation angle of the abutment is basically consistent with the change law of loading displacement. With the change of ambient temperature, the two gradually deviate. Especially in the first quarter of the next year, the two have produced a more obvious positive direction deviation.

以中小跨径组合梁的桥面板为研究对象,对钢筋混凝土及预应力混凝土两种类型的桥面板开展足尺模型的静力试验及疲劳试验,对比了施加预应力对于混凝土桥面板疲劳性能的影响.研究表明钢筋混凝土桥面板在开裂后刚度下降明显,其跨中挠度、板顶混凝土压应力的变化规律均呈现出"S"型曲线,由于其底部混凝土易开裂,有效受压区高度降低,截面中性轴上移,造成底部受拉钢筋应力增大;而预应力混凝土桥面板可保持刚度稳定,施加预应力可有效限制混凝土开裂,使受拉钢筋与混凝土共同作用,因此施加预应力可有效延长桥面板疲劳寿命.

在台后填土作用下整体式桥台-H型钢桩-土相互作用和大不平衡土压力下(台后土表面均布荷载增大了3.81 kPa)整体式桥台-H型钢桩-土相互作用拟静力试验研究的基础上,提出了考虑台后不平衡土压力下整体桥桩基-土相互作用的内力计算方法,计算了整体桥台底弯矩和剪力以及桩身弯矩和剪力,并与现有的台后土压力理论和桥梁规范的计算值进行比较.结果 表明:正向加载时,采用现有的台后土压力理论和桥梁规范计算得到的台底弯矩和剪力以及桩身弯矩和剪力均与试验结果存在较大偏差;采用黄-林法可较准确地计算AHP模型的台底弯矩和剪力以及桩身弯矩和剪力;对于LAHP模型,试验值均与各理论计算值相差较大;正向加载时,随着位移荷载的增加,AHP和LAHP模型的台底和桩身弯矩均逐渐增大;台后堆载(大不平衡土压力)对整体桥台底剪力和弯矩以及桩身的剪力和弯矩产生较大的影响,LAHP模型的台底和桩身弯矩整体上均大于AHP模型的,而LAHP模型的台底剪力小于AHP模型的,桩身剪力大于AHP模型的.

为研究施加预应力对混凝土桥面板疲劳性能的影响,文章选取钢筋混凝土桥面板作为对照对象,采用足尺模型疲劳试验进行研究.试验主要研究其疲劳性能,利用液压脉动疲劳试验机进行正弦波加载试验.试验现象和结果表明,与钢筋混凝土桥面板对比,预应力混凝土桥面板开裂荷载较高,而且能够有效限制混凝土开裂,同时钢筋混凝土桥面板在开裂后由于截面中性轴的上移,其钢筋受力较预应力混凝土桥面板更高,其疲劳性能明显低于预应力混凝土桥面板,其主要原因在于施加预应力能够较好地限制结构的开裂,使得钢筋和混凝土在疲劳受力时能够共同受力,此研究结果可用于工程实践,也可为桥面板设计提供参考.

环槽铆钉具有预紧力一致性好、防松动能力优异、抗疲劳和抗延迟断裂能力强等特点,是公路桥梁连接副的理想选择.由于缺乏相关试验研究以及工程实用案例,环槽铆钉在公路桥梁上鲜有使用.针对公路桥梁连接副的特点,开展了环槽铆钉预紧力试验研究.试验结果表明,同型号环槽铆钉的预紧力值大于高强螺栓,且均匀性好;环槽铆钉可参照高强螺栓技术规程中的铆接顺序进行安装;温度变化对环槽铆钉预紧力的影响较小;公路桥梁钢结构常用板厚变化对于环槽预紧力的影响较小.

环槽铆钉具有预紧力一致性好、防松动能力优异、抗疲劳、抗延迟断裂能力强等特点,是公路桥梁连接副的理想选择.但由于缺乏相关试验研究以及工程实用案例,环槽铆钉在公路桥梁上鲜有使用.文章依托某钢混组合梁桥工程,开展了环槽铆钉双摩擦面抗剪试验、抗剪疲劳试验研究,并与传统高强螺栓进行对比.试验结果表明:(1)同类型环槽铆钉与高强螺栓荷载-位移曲线变化趋势大致相同,且环槽铆钉和高强螺栓在滑动后并没有迅速失效,高强度螺栓滑动后瞬间损失的承载力要大于同类型环槽铆钉滑动后瞬间损失的承载力.(2)环槽铆钉的抗滑移系数、滑动力和抗剪极限承载力均高于同类型高强螺栓的抗滑移系数和滑动力,且离散性更小,稳定性更好.(3)200万次疲劳试验对高强螺栓和环槽铆钉的预紧力、滑动力和极限抗剪承载力影响很小,且前者损失要大于同类型后者.研究成果对推动环槽铆钉在钢桥中的应用具有一定指导意义和理论依据.

伸缩缝作为公路桥梁工程的重要组成部分,具有控制桥梁两端翘曲角度、解决混凝土收缩问题、确保桥梁平稳自如伸缩等功能,对改善桥梁结构性能、保证行车安全有重要意义.实际工程中,由于设计、制造、施工、后期养护等方面的原因,公路桥梁工程会出现各类伸缩缝病害,严重影响着公路桥梁的安全性及行车舒适性.文章针对国内公路桥梁伸缩缝,通过文献调研与实地考察的方式,全面详细地总结出目前国内伸缩缝存在的主要病害问题及其成因,给出了处置方法,同时针对伸缩缝的设计、制造、施工、后期养护等方面提出一定意见与建议,并对伸缩缝的未来研究方向进行了展望,以提供一定工程参考.

高烈度震区大跨度高墩连续刚构桥具有地震力强、上部结构质量重、桥墩柔度大等特点,桥墩作为主要延性抗震构件,合理的设计直接关乎桥梁的正常运营与人员生命安全.为确定桥墩结构形式对大跨径高墩连续刚构桥抗震性能影响,以拟建乐山至西昌高速公路马边至昭觉段S1标段为研究对象,采用数值仿真技术对比分析独柱薄壁墩、双肢柔性薄壁墩2种桥墩结构形式对结构抗震性能的影响.得到2种结构形式的优势及应用特点,为相似的工程提供借鉴.

随着城市路网的不断发展,城市主干路两侧开口越来越多,研究城市主干路框架隧道出口与主路出口的最小间距,有助于合理设置出入口位置,优化交通组织,提高主干路服务水平.文中通过对车辆出隧道后驶出主路出口的驾驶特征分析建立最小间距计算模型,针对不同设计速度和车道数,结合已有研究成果进行参数标定与计算,提出框架隧道段出口与主路出口的最小间距建议值;对成都正公路一框架隧道出口进行实例评价,结果表明该出口间距满足等待可插入间隙下的最小行车间距要求.

首先简要介绍了海鸥式钢箱拱桥的结构特点,进而结合南宁罗文大桥的桥位情况、通航等建设条件,开展海鸥式钢箱拱桥的主拱成拱施工方案的比较和分析,通过分析得出了适宜的施工方案。

介绍了南宁市的城市情况及邕江桥梁的总体情况,结合南宁市罗文大桥的建设条件,提出了四个桥型设计方案,并对四个方案的优缺点进行对比。在城市桥梁桥型方案设计,进行了一些有益的实践和探讨。

On the basis of investigation of the seismic damage to the simply-supported girder bridges in several violent earthquake events at home and abroad in the recent years,the seismic damage to the bridges is categorized and its causes are analyzed.In comparison of the relevant seismic specifications for bridges both in China and foreign countries,the insufficiencies of the current specifications of China are expounded,the performance of the simply-supported girder bridges used with the seismic mitigation and isolation techniques in the seismic damage is introduced and the proposals for the seismic design of the bridges in seismic regions are made as well.

对WLK0+084.55映秀岷江桥震后抢通保通的设计思路进行了详细介绍,可供因灾受损桥梁的紧急恢复交通提供参考。