山东某商场节能改造实证研究

以山东省某集购物、休闲、餐饮、服务于一体的现代化大型购物中心的节能改造为案例,通过对该商场能耗现状进行分析,发现该商场能耗主要集中在照明和中央空调系统上,进而对各能耗系统提出节能改造方案并进行了实施,初投资1 500万元,改造后实现整体年节电266.7万k W·h,节电率达18.78%。该商场节能改造的实证分析对公共建筑的节能改造具有一定的参考价值。     

某工程拔柱加固设计

某工程裙房高六层,含三层地下室,柱跨为8.7～11.0 m.因该建筑使用功能改变,需要拔除第5层的一根柱,形成17.6 m×20.5 m大空间.经方案比较,需要在第6层处设置二个斜撑,斜撑底设置联系拉杆,同时加固第6层对应位置柱为拉杆,吊住第6层相应框架梁.该裙房的拔柱加固设计经验,可供类似工程参考.     

绵阳市房屋震害分析及震后加固方法研究

汶川地震中,绵阳市大部分房屋均有不同程度破坏.本文对绵阳市砖混结构、框架结构房屋所受震害、加固方案进行分析,对施工过程进行了跟踪调研.经过几次明显震感的余震后,经检测,加固过的房屋未出现任何破坏,表明:(1)依据现行相关规范要求进行加固的房屋,抗震能力明显增强.(2)依据墙体破坏程度和墙体承重与否,对墙体采用不同的加固...     

中心城区既有中小型公共建筑节能改造案例研究

研究了上海中心城区既有中小型公共建筑围护结构、用电系统(空调、照明)、运行管理系统等节能改造技术,分析了为实现综合节能50％的改造目标进行的改造案例实施情况.通过改造前后的能耗实测对比,单位面积能耗由44.7 kW· h/m2降低到27.2 kW·h/m2,实现了综合节能39％.     

Behavior and design of reinforced concrete frames retrofitted with steel bracing against progressive collapse

Steel bracing is able to improve progressive collapse resistance of reinforced concrete (RC) frames, but the bracing design is typically based on seismic retrofitting or lateral stability. There is no approach for design of steel bracing against progressive collapse. To this end, a retrofitting approach with steel braces is proposed based on analysis of macro finite element (FE) models with fiber beam elements. The FE models were initially validated through the experimental results of a braced frame and then used to investigate the effects of pertinent parameters on the progressive collapse resistance of planar frames. The results suggest the braces should be placed at the top story. Thereafter, macro FE models are built to investigate the dynamic responses of the three‐dimensional prototype RC frames under different column removal scenarios (CRS) and show the necessity of retrofitting. Accordingly, the design approach of steel bracing is proposed with incremental dynamic analysis (IDA) and assuming independent contribution of braces and frames to resistance. Finally, the fragility analysis of the frames under a corner‐penultimate‐exterior CRS is conducted through IDA and Monte Carlo simulation, and the results confirm the validity of the proposed design approach for retrofitting RC frames.     

旋流锅炉低氮燃烧器改造后运行情况分析

国内某600 MW机组锅炉经旋流低氮燃烧器改造后,NO_x排放浓度明显下降,但在运行中出现了诸多问题。针对改造后突显的再热器壁温超温、锅炉运行两侧氧量偏差变大、高负荷下NO_x得不到有效的控制等方面进行分析并提出了改进措施,保证了锅炉低氮燃烧器运行的高效性和安全性。     

青岛广电大厦演播室空调机房的改造

为保证广播电台演播室的正常工作,对原有的空调机房进行了改造.在空调机房内设置风冷机组,并将风冷机组的蒸发器安装在原组合式空调机组内部,满足了电台演播室全年需要制冷的需求,并具备一定的节能效果.