浅谈公路桥梁的定期检查

对桥梁病害检查进行了分类,确定定期检查的重要性,并从定期检查的角度分别对桥梁上部、下部、防护工程等各部位的病害原因及检查方法进行了介绍。     

重庆两江大桥长期健康监测系统研究

介绍重庆两江大桥健康监测系统结构体系、总体目标和主要监测内容,同时还介绍仪器设备选型及优化组网、采集处理策略、数据库管理、结构健康评价及用户界面显示。两江大桥健康监测系统是一套完整的围绕大桥梁、塔、索、轨道4大体系,由多种传感器和相关采集仪以及3层网络构成的大型桥梁长期健康监测系统。经过小型实验室试验和桥梁工程应用,结果表明,该系统通讯网络简洁,抗干扰能力强,故障率低,维护方便,运行性能稳定,监测数据可靠、准确,可准确地评估桥梁的健康状况。     

浅谈桥梁病害与加固

桥梁在投入运营使用后出现的种种病害是必然结果,针对相应病害采取适宜的加固措施将具有长远的技术经济价值。     

关于预应力结合梁桥

本文介绍了美国公路桥采用预应力结合梁桥的情况及其研究动态:指出了值得我们关注的问题。笔者还提出了计算预应力结合梁的有限元方法,并推导出预应力钢筋的单元刚度拒阵,编写了程序,其计算结果与实验数据符合。      

重庆两江大桥工程施工关键技术管理与控制

阐述重庆两江大桥工程施工过程中,结合工程结构特点,针对空间曲面索塔施工、钢桁梁制造安装及超大吨位钢绞线拉索安装张拉等施工关键技术所采取的管理和控制措施,并介绍两江大桥工程施工质量的总体控制效果。     

Design of bridges against ship collisions

The paper outlines a rational design procedure for bridge piers and pylons against ship collision impacts. Firstly, a set of risk acceptance criteria are proposed. This is followed by a mathematically based procedure for calculation of the probability of critical ship meeting situations near the bridge, and the probability of ship collision accidents caused by human errors as well as technical errors. This first part of the paper leads to identification of the largest striking ship, “design vessels”, a given bridge pier must withstand without structural failure in order for the bridge connection to fulfil the risk acceptance criteria. The final part of the paper is devoted to an analysis of the needed impact capacity for the bridge pylons and piers exposed to ship bow impact loads from these “design vessels”. For a number of different ship types and different tonnage merchant vessels, load – displacement relations for ship bow collisions against rigid walls are derived. Based on these comprehensive numerical results, a new empirical relation is derived which is suited for design against bow collisions. This expression for maximum bow collision forces is compared with a previously published expression for ice-strengthened ships and with existing standards for assessment of bow crushing forces. It is shown that there is need for an update of these existing standards. For design of piers and pylons against local impact pressure loads, a pressure - area relation for bulbous bow impacts is derived.     

锚喷混凝土技术在石拱桥加固中的应用

文章通过对巴龙港桥存在的病害及成因进行分析,提出采用锚喷混凝土技术的石拱桥加固方案,并通过加固计算,验证了锚喷混凝土技术对提高大桥结构强度、刚度和耐久度的作用。     

贝雷片拼装水上浮式门吊的设计与施工探讨

文章结合厄瓜多尔巴巴奥约河大桥工程实例,介绍一种由浮船、贝雷桁架组装的大型水上浮式门吊起重设备的设计和施工技术要点,为类似桥梁工程提供参考。     

城市桥梁色彩景观设计分析--以重庆两江大桥色彩景观设计为例

以重庆东水门长江大桥及千厮门嘉陵江大桥景观设计方案为例,对桥型、桥位周边建筑,重庆城市环境色彩及邻近桥梁色彩进行分析,以探求合理的桥梁色彩景观设计方法,为桥梁色彩设计提供参考。     

钢筋混凝土桥梁结构动力有限元模型修正

在建立桥梁结构有限元模型时,所建的有限元模型与结构的真实情况不可避免地存在着差异。要建立精确的有限元模型,必须利用大桥现场环境振动测量值得到一组结构实测模态参数,用以作为有限元模型修正的基准。利用有限元分析软件ANSYS的优化功能,对桥梁结构进行模型修正,修正后有限元模型的动力特性更加趋近于环境振动实测值。修正后的结构有限元模型可以作为大桥损伤监测和整体性评估的基准。