箱梁钢筋保护层质量合格率控制分析

对某项目箱梁钢筋保护层进行抽查,分析预应力混凝土箱梁钢筋保护层合格率偏低的原因,并提出行之有效的解决方法。     

潮汐区真空预压联合堆载地基加固技术的应用

介绍宁波大榭招商国际集装箱码头工程在潮汐区采用真空预压联合堆载方案对集装箱堆场进行地基加固处理的施工设计、施工工艺,以及在潮汐区施工中遇到的技术难题的处理措施。     

高速动力车不锈钢蒙皮焊接接头的耐蚀性能研究

本文对高速动力车车体1Cr18Ni9Ti不锈钢蒙皮焊接接头进行了耐晶间腐蚀研究，认为采用H1Cr18NiTi、HoCr19Ni12mO2O焊丝MIG、TIG焊均能有较子的耐腐蚀性能，但焊后热娇形对耐腐蚀性十分不利。     

碳纤维布在沙河桥工型梁加固工程中的应用

采用碳纤维布加固混凝土结构是国内日渐关注和发展的加固应用技术,结合107国道河北省新乐市一沙河大桥、三沙河大桥加固工程,介绍了原材料、设备等,阐述了采用碳纤维布粘贴在工型梁底部进行桥梁加固的作用机理和施工工艺。     

浅谈杂散电流腐蚀机理及防护措施

详细阐述了地铁杂散电流的形成机理及主要的防护措施。     

Effect of pitting corrosion on local strength of hold frames of bulk carriers (2nd Report)—Lateral-distortional buckling and local face buckling

Pitting corrosion is typical corrosion observed on coated hold frames of bulk carriers which exclusively carry coal and iron ore. In order to secure the safety of these types of bulk carriers, it is important to understand the effect of pitting corrosion on local strength of hold frames.

In order to investigate this effect, a series of 4- and 3-point bend tests on structural models which consist of web, shell and face plates has been carried out. Artificial pitting was created on the web plate to simulate pitting. In the 4-point bend tests, two equal concentrated loads have been applied vertically at the one-third points of simply supported models so that compression load due to bending would act on the face plate. In this testing condition, lateral-distortional buckling occurred before reaching the ultimate strength and local buckling of the face plate was observed after reaching the ultimate strength. The effect of web plate pitting on the lateral-distortional buckling strength was found to be small but the ultimate strength decreases with increase in the degree of pitting intensity. In the 3-point bend tests, concentrated load has been applied vertically at the center of simply supported models so that compression load due to bending would act on the face plate. In this testing condition, local face buckling occurred just after reaching the ultimate strength. The ultimate strength is found to be decreasing with increase in the degree of pitting intensity.

A series of non-linear FE analyses has been performed to simulate the deformation behavior observed in the tests. It has been revealed that even in the case of randomly distributed pitting corrosion the ultimate strength of the structural models was almost the same as that of the structural models with uniform corrosion corresponding to the average thickness loss.     

水冷型艉轴的腐蚀形态及防护措施

艉轴是船舶的重要部件,其性能的好坏直接影响船舶动力装置性能的发挥和船舶的安全性,而腐蚀又是直接危害艉轴性能的主要因素。文章归纳了艉轴腐蚀易发生的部位及腐蚀形态,通过分析其腐蚀机理,提出了有效的防护措施。     

发电车膨胀水箱吊座裂纹分析和补强校核

对发电车膨胀水箱吊座结构进行了有限元强度分析,对吊座和弯梁裂纹进行了失效分析,并对补强方案进行了强度校核,同时确认了其他车型发电车的膨胀水箱吊座强度裕量满足要求。     

加筋土结构技术应用

对加筋土挡墙的结构特点及基本原理进行了分析,并讨论了其施工要点及对材料的要求。     

预应力混凝土连续箱梁维修加固技术措施

横山大桥主桥为52 m 80 m 52 m预应力混凝土连续箱梁,通车8年后发现梁体大量裂缝,且病害还在不断发展,结构承载力逐渐下降,严重影响了行车安全。经采取增加加劲钢架并同时采取裂缝灌浆处理、粘贴钢板加固补强、粘贴碳纤维布等技术措施后,桥梁整体受力性能得到明显改善。