锌铬膜涂层的制备研究

用粒状金属锌粉、铬酸和有机还原剂等材料制备了锌铬膜涂层,研究了锌铬膜涂层的成分、结构及有关性能.结果表明,实验中制备的锌铬膜涂层是由Zn·ZnO·Cr2O3·CrO3)组成,该涂层具有良好的耐蚀性,涂层涂覆的质量受涂液成分变化的影响.     

AWP-2000F型纤维增强桥面粘结防水涂料在南京长江第四大桥的应用

该文首先阐述了桥面防水层的性能要求,并介绍了目前国内某些防水层设置的优缺点。鉴于这些防水层设置方案都存在或大或小的缺陷,长安大学专题组经研究,推出一种纤维增强型防水涂料,并成功应用于南京长江第四大桥。该文介绍了其施工技术方案,可供同行参考。     

水位变动区钢管桩涂层修复技术经济比选

针对天津港联盟国际集装箱码头钢管桩涂层破损的实际情况,从技术特点、现场施工、后期维护管理、修复成本等方面对重防腐涂料修复技术和包覆防腐修复技术进行了技术经济分析。经比选,确定采用包覆防腐修复技术(PTC新型包覆防蚀技术和矿脂防腐带冷包缠技术)对钢管桩水位变动区涂层进行修复。     

变截面圆柱形空腔覆盖层吸声系数的二维近似解

具有空腔周期性排列的粘弹性结构在水声工程中有着广泛的应用.将包含变截面圆柱形空腔周期性排列的吸声覆盖层的一个单元进行分段近似成多层圆柱管结构,并应用子域分割法在分段的接合界面处满足平均轴向位移和平均轴向应力连续,给出了变截面圆柱形空腔吸声覆盖层吸声系数的二维近似解.分析了高阶传播波和分段层数对吸声系数的影响,比较了不同空腔形状对覆盖层吸声性能的影响.研究结果表明,在一定频率范围内,主要是最低阶传播模式对吸声性能起作用,喇叭型空腔结构较圆柱型空腔结构吸声覆盖层的吸声性能更加优良.在覆盖层设计中,空腔的形状应有一个优化的过程.     

Fatigue behaviour and life prediction of filament wound CFRP pipes based on coupon tests

This paper investigates the fatigue behaviour of filament wound Toray T700/Epotech X4201 composite pipes with different lay-ups. The present work compares the fatigue behaviour of coupon specimens manufactured with two different fiber orientations under tension-tension and tension-compression cyclic actions. The test results show that the lay-up and stress ratio have significant effect on the failure mechanism and fatigue life of carbon fiber reinforced polymer (CFRP) composite coupons. This paper develops an empirical model, which integrates the effect of stress ratio in a fatigue damage parameter, to evaluate the fatigue life of the CFRP filament wound coupons. Combined with the numerically calculated stresses at the critical locations corresponding to the fatigue damage locations, the proposed empirical model developed from the coupon test database predicts successfully the fatigue life of full diameter CFRP pipes, using stresses computed at critical locations in the CFRP pipe.     

Compression and hysteresis responses of multilayer gradient composite lattice sandwich panels

In order to improve the combat effectiveness, stealth and safety of the marine structures, we design and fabricate the multilayer gradient composite lattice sandwich panels (MGCLSPs) to achieve excellent mechanical properties, vibration isolation characteristics and lightweight features of structures in the present study. The ideas of bionic gradients and material mixtures are incorporated in the design to improve the damping and vibration isolation behaviors of the MGCLSPs. The compression and hysteresis responses of the empty and polyurethane foam-filled MGCLSPs are investigated experimentally and numerically. It is found that the MGCLSPs have better energy absorption characteristics than the non-gradient panels, and the MGCLSP specimen D1 which is positive gradient absorbs the most energy. The experimental results also show that the addition of polyurethane foam can enhance the strength and energy absorption characteristics of MGCLSPs.     

行标《水平涂层逆反射亮度系数测试方法》的研究

<水平涂层逆反射亮度系数测试方法>是一个真正意义上的路面水平涂层的逆反射性能的测试方法,它的颁布为国内系统完整地开展路面水平涂层的逆反射性能研究打下了基础.     

水基涂料对树脂自硬砂强度影响的研究

给出了树脂自硬砂用新型水基涂料的特点及涂敷工艺规范，生产实践表明，采用新型水基涂料和正确的涂敷工艺规范，可强化型（芯）表面，防止铸造缺陷，获得优质铸件．     

朔黄铁路32 m超低高度预应力混凝土简支T梁适应30 t轴重货车加固改造分析

对朔黄铁路跨度32 m超低高度预应力混凝土简支T梁适应轴重30 t及以上重载货车(1.2倍ZH(2010)活载)进行了检算分析,结果表明梁体的竖向刚度和力学性能已不能满足现行铁路规范的要求,需对桥梁进行加固改造。选取顶升预弯辅助钢梁的加固方案,使原混凝土梁和预弯辅助钢梁组成组合结构,在活载作用下二者跨中挠度协调一致,在30 t轴重活载作用下梁体的抗裂性、强度和竖向刚度等各项关键指标均满足现行规范要求,能够达到预期加固效果。     

复合式TBM重叠隧道施工控制技术研究

以重庆轨道交通5号线冉家坝站—大龙山站区间及大龙山站—大石坝站区间为背景,针对2条重叠小净距隧道的特点,重点阐述注浆加固、下层隧道同步支撑台车、上层隧道复合式TBM重叠段掘进控制等施工技术在隧道施工中的应用,对城市轨道交通类似工程提供参考。