对震后损伤框架结构刚度退化问题的研究

结合对震后损伤框架结构在反复荷载作用下刚度退化的研究是结构抗震分析的重要内容,通过对一层一跨的框架结构施加低周反复荷载试验,得出了结构构件的抗震滞回特性,同时,对框架结构构件的刚度退化情况做了计算和分析,从而为建筑物加固方法的确定奠定了理论基础。     

深层平板静载荷试验和低应变反射波法的应用

指出随着桩基检测技术的不断发展,深层平板静载荷法和低应变反射波法作为一种行之有效的桩基检测方法已经得到了广泛的应用,结合某科研中心人工挖孔墩验收检测实例对其进行论述,以指导类似工程施工。     

振冲密实法在榆林机场场道地基处理中的应用

以榆林机场迁建工程场道地基处理工程为例,介绍了振冲砂桩在沙漠地区粉细砂土中的应用,通过对振冲器的改造及现场施工工艺参数的严格控制,取得了较好的加固效果。     

某水电站进场公路桥梁成桥荷载试验研究

对某水电站进场公路中一座悬链线空腹无铰钢筋混凝土箱形拱桥进行了荷载试验及其数据分析,并运用大型有限元程序MIDAS进行了仿真分析,对多种工况下桥梁变形和截面应力实测值与理论值进行了比较,结果表明结构强度和刚度达到设计要求。     

东江南特大桥主桥桥式的选择

以穗莞深城际轨道交通项目东江南特大桥主桥初步设计方案为背景,由于荷载图示的变化,分析比较了在不同桥式方案下的综合技术指标,进而得出采用下承式整体桥面加劲钢桁梁桥为最优方案。     

冲击系数对桥梁汽车荷载效应的影响分析

通过以简支梁桥为研究对象,列举公路桥梁相关规范中冲击系数的计算方法,使用公路交通行业里常用的简支空心板桥的标准图来进行结果比较,为分析冲击系数对桥梁汽车荷载效应的影响提供参考。     

浅谈CFG桩复合地基的设计与施工

通过具体工程实例,详细介绍了CFG桩复合地基的设计与施工,复合地基静压结果表明,本工程所设计的CFG桩复合地基技术参数合理、施工技术可靠,满足工程需要,有效控制了地基变形。     

CFG桩处理填土地基及其检测评价

针对某一工程的特殊地质条件和对地基的具体要求,采用CFG桩复合地基,成桩以后对复合地基进行现场载荷试验和反射波法低应变动力检测试验表明,CFG桩桩身完整性良好,复合地基承载力达到基础设计要求,同时,对建筑后期的沉降观测结果进行分析,证明该工程的CFG桩复合地基设计及施工是成功的。     

灌注桩后注浆技术原理与提高承载力的探讨

从钻孔灌注桩后注浆技术基本原理、影响钻孔灌注桩承载力的因素以及钻孔灌注桩提高单桩承载力的机理方面进行了论述,并介绍了桩底、桩侧压浆工艺,以使桩的承载力提高,获得较好的技术经济效益。     

Intra-storm variability in microbial partitioning and microbial loading rates

Association with particles in the water column can have a significant impact on microbial fate and transport. This study analyzed multiple stormwater samples taken throughout the duration of three separate storms (at two different sites) to evaluate the fraction of microbes partitioning to denser "settleable" particles and to examine how partitioning behavior varied over the course of a storm. Intra-storm sampling also allowed for estimates of microbial loading rates (both total and particle-associated) and cumulative storm-induced microbial load. Five different indicator organisms were examined, with the fraction of microbes associated with settleable particles assessed via a calibrated centrifugation method. Partitioning behavior varied across microorganism type, with an average of 40% of fecal coliforms, Escherichia coli, and enterococci associating with settleable particles, compared to approximately 65% of Clostridium perfringens spores and only 13% of total coliphage. Partitioning remained fairly constant for each type of organism throughout storm events. Nonetheless, higher concentrations of both settleable particles and microbes entering the water column soon after the onset of a storm led to higher loading rates of settleable microbes in the storm's earliest stages, a trend that could have important implications for the design of stormwater management structures (e.g., detention basins). Estimates of cumulative storm-induced microbial loading suggested that one day's worth of storm loading can be the equivalent of months, or even years, of dry-weather loading.