低碳合金钢高温防氧化涂料的制备与性能

以海洋用钢轧制时的氧化为研究对象,用料浆法制得了以碳化硅和二氧化硅为主要成分的高温抗氧化涂料.采用X射线衍射和电子探针能谱等测试方法,研究了涂层保护钢样在1 300℃下氧化增重、氧化产物、截面形貌以及元素分布的特征.结果表明,该涂料对低碳合金钢具有良好的高温防护功能,防氧化效果达91.7%,且成本低廉,使用简便,具有广阔的应用前景.     

高轴压比下内藏钢桁架混凝土组合高剪力墙抗震试验研究

通过对3个1／3缩尺的高剪力墙模型（其中包括1个普通混凝土高剪力墙、1个内藏钢框架组合高剪力墙和1个内藏钢桁架组合高剪力墙）的抗震性能试验研究，探讨了不同组合形式剪力墙的承载力、刚度及其退化过程、延性、滞回特性及破坏特征。试验表明：内藏钢框架混凝土组合高剪力墙和内藏钢桁架混凝土组合高剪力墙的抗震性能比普通混凝土高剪力墙明显提高。     

钢结构端板连接抗震设计方法

系统地总结了国内外钢结构端板连接研究成果以及相关设计规范的规定，提出了钢结构端板连接抗震设计具体方法，主要包括：节点标准构造、抗震承载力验算、极限承载力验算、延性设计，为我国钢结构抗震设计规范的相关内容提供了有益补充建议。     

三维非线性有限元分析在地下管棚支护中的应用

结合某地下隧道管棚支护设计及施工方案，采用三维非线性有限元对该洞库的开挖与支护过程进行了模拟，得出的结论是：管棚支护对于控制地表沉降、侧墙水平位移和塑性变形作用明显；不同管径和管间距对位移最大值影响有限，但对管钢内应力有较大影响；不同开挖进尺、不同注浆加固厚度对围岩变形及支护结构的影响较大。该数值分析结果与以往现场实测结果相一致，可作为相关工程设计和现场施工的理论指导。     

我国油气开发监测技术进展

文章介绍了油气开发中主要关心的油气藏、井场设备及套管的监测技术和运用效果，油气藏监测主要是剩余油和油藏储藏物性的监测，套损直接影响油、水井的使用寿命、油、气产量和注水效果，井场设备运行的好坏直接关系油、气产量和注水效果，输油（注水）管道泄漏造成资源的浪费、人身伤害和环境污染事故.通过地球物理、地球化学及油气藏工程等检测和监测技术认识油气藏流体分布、性质、运动状态，评价套管、管线及井场设备的健康状况，为油田优化开发方案的制定、管理及实施提供依据.     

型钢混凝土剪力墙的抗震性能研究

型钢混凝土剪力墙(亦称为SRC剪力墙)是一种新型的剪力墙,其抗弯承载力、抗剪承载力及延性均好于普通剪力墙。本文简要总结了近年来国内外关于型钢混凝土剪力墙抗震研究的成果。在此基础上,进行了较高轴压比下内藏钢桁架混凝土组合高剪力墙的抗震性能试验研究。试验研究表明,内藏钢桁架的存在明显改善了高轴压比下型钢混凝土高剪力墙的抗震性能。     

钢管混凝土框架骨架曲线研究

以钢管混凝土统一理论为基础,从截面层次的恢复力模型出发,钢管混凝土柱构件选用三线型弯矩~曲率滞回模型;钢梁采用双线型弯矩-转角滞回模型;钢筋混凝土梁选用三线型弯矩-转角滞回模型。使用非线性分析程序IDARC分析钢梁-钢管混凝土柱和钢筋混凝土梁-钢管混凝土柱两类框架结构的骨架曲线,程序结果和试验结果吻合良好。并进一步研究了轴压比、含钢率、混凝土强度和钢材强度等对结构骨架曲线的影响。研究结果不仅为钢管混凝土框架结构的应用推广提供了必要的理论基础,而且对钢管混凝土抗震设计具有较好的参考价值。     

组合剪力墙的抗震研究与发展

剪力墙是高层建筑结构中的核心抗侧力部件,研制抗震性能好的剪力墙,是建筑抗震设计的关键技术之一。组合剪力墙包括不同材料和不同结构形式的组合,可以发挥不同材料和不同结构形式各自的优势,使剪力墙的延性和耗能能力得以提高,从而改善其抗震性能。本文对国内外一些新型组合剪力墙的抗震研究工作进行了归纳总结,并对其发展作一展望。     

Effect of near‐fault ground motion and damper characteristics on the seismic performance of chevron braced steel frames

This study is aimed at comparing the seismic performance of steel chevron braced frames (CBFs) with and without fluid viscous dampers (FVDs) as a function of the characteristics of the near‐fault (NF) ground motion and FVD parameters. For this purpose, comparative nonlinear time history (NLTH) analyses of single and multiple storey CBFs with and without FVDs are conducted using NF ground motions with various velocity pulse periods scaled to have small, moderate and large intensities. Additionally, NLTH analyses of single‐ and four‐storey CBFs with FVDs are conducted to study the effect of the damping ratio and velocity exponent of the FVD on the seismic performance of the frames. The analyses results revealed that the seismic performance of the CBFs without FVDs is very poor and sensitive to the velocity pulse period and the intensity of the NF ground motion due to brace‐buckling effects. Installing FVDs into the CBFs significantly improved their seismic performance by maintaining their elastic behaviour. Furthermore, FVDs with smaller velocity exponents and larger damping ratio are observed to be more effective in improving the seismic performance of the CBFs subjected to NF earthquakes. However, FVDs with damping ratios larger than 50% do not produce significant additional improvement in the seismic performance of the CBFs. Copyright © 2006 John Wiley & Sons, Ltd.     

Experimental investigation of conditions of lateral shear reinforcements in RC columns accompanied by buckling of longitudinal bars

This study presents a cyclic load test of four RC columns to obtain data on stresses and strains on lateral shear‐reinforcing bars that contact buckled longitudinal reinforcing bars. The specimens include columns laterally jacketed with all‐elastic fibre‐reinforced polymer (FRP) sheets. The buckling lengths and modes in the longitudinal bars of the four column specimens stabilized at a buckling deflection (= lateral deformation of buckled longitudinal bar) from 0.3 to 0.6 mm. The yield portion ratio r_by of shear reinforcement around the buckled longitudinal bars was introduced as an index of the development of buckling conditions. Here, the yield portion ratio r_by was defined as the ratio of the length of the region where the shear reinforcements yield l_by, to the buckling length l_b. The r_by values of the tested columns ranged from 0.45 to 0.76. The test results show that the buckling stress and the specific compressive stress of the longitudinal bars in the columns were smaller than those of the bare bars. Copyright © 2007 John Wiley & Sons, Ltd.