对服役结构后续服役期内抗震设防水准的研究

提出评估基准期的概念,推导出烈度的超越概率与重现期、年平均发生率三者间的关系。按照等超越概率原则确定不同后续服役期内小震、中震和大震的重现期。借鉴地震危险性分析的最新研究成果,给出基本烈度的计算方法及其与多遇烈度和罕遇烈度的换算关系,并落实到地震影响系数最大值以便实用。最后结合具有代表性的算例进行了说明。     

Sinopec International Petroleum Exploration and Production Corporation

Sinopec International Petroleum Exploration and Production Corporation （＂SIPC＂）, a wholly owned subsidiary of Sinopec Group, is committed to integration of overseas oil and gas investment and operation. So far SIPC has 43 oil and gas exploration and development projects in 22 countries worldwide, covering the world＇s most resourceful regions, Africa, the Middle East, South America, Asia Pacific, Russia and Central Asia. With overseas portfolio layout taking shape, the company came to a rapid growth with annual output of equity oil exceeding 18 million tons.     

Successful Commercial Application of Hexene-1 Package Technology at PetroChina

正On October 29,2014 the hexene-1 package technology independently developed by the Petro China Petrochemical Research Institute(PRI)has been applied in commercial scale at the new hexane-1 unit of the Dushanzhi Petrochemical Company while cranking out qualified product with the purity of hexane-1 exceeding 99%.It is learned that the main techno-economic indicators of this     

除氧器溶解氧超标与回收热效率低的处理

针对除氧器存在的溶解氧超标与回收热效率低的问题,通过对设备在停运期间加强保养、加热蒸汽进行调整、加药装置的位置改造、轴封水的改造、热水管的改造等,使问题得到良好的解决.     

某超限高层办公楼结构设计

本文针对广州某超限高层办公楼结构设计进行研究,介绍了该项目的结构体系、工程超限情况及有针对性的构造加强措施.采用了SATWE和ETABS两种软件进行结构整体分析,用PKPM-EPDA进行静力弹塑性分析.计算结果表明结构在罕遇地震下处于延性阶段,结构抗震性能满足规范要求.     

高抽巷在瓦斯抽采中的应用研究

为了解决松藻打通一矿工作面回采初期和回采期间瓦斯超限、制约煤矿安全生产的问题,对W2709S工作面采用了高抽巷治理邻近层瓦斯技术,采用KJ90N煤矿安全综合监控系统测量了瓦斯抽采浓度和瓦斯抽采纯量等参数。结果表明,随着高抽巷的应用,W2709S工作面的瓦斯抽采浓度提高了367%,抽采纯量提高了87.2%,工作面尾排瓦斯浓度下降了63.2%,工作面隅角瓦斯浓度下降了23.7%,工作面回风巷的瓦斯浓度下降了0.34%,W2709S工作面的推进度提高了25%,同时相邻的W2709N工作面推进度提高了7%。说明高抽巷在W2709S工作面的应用,使工作面瓦斯超限问题得到了极大的缓解,同时研究为同类煤矿工作面瓦斯问题的解决提供了重要参考。     

浅谈民用高层建筑方案投资估算法

民用高层建筑方案投资估算结果对工程建设投资具有实际的指导意义,本文介绍两种高层建筑方案投资估算的初浅方法,供有关专业人员参考。     

X形变截面优化橡胶密封圈比较应力有限元分析

基于有限元分析理论,借助软件ANSYS对X形变截面优化橡胶密封圈进行有限元分析。建立了X形变截面优化橡胶密封圈有限元模型,比较了X形变截面优化密封圈与X形变截面和X形橡胶密封圈最大综合等效应力情况。结果表明:X形变截面优化密封圈的应力主要集中在组合面圆弧内角处,特别是内角处更易损坏;在同等条件下,X形变截面优化密封圈的最大等效压力值比X形变截面密封圈的小,比X形(即星形)密封圈的大;X形变截面优化密封圈可用于替代X形(即星形)密封圈使用。     

建设项目超投资成因初探及对策

针对目前建设项目普遍存在的“概算超估算、预算超概算、决算超预算”三超问题,分析了建设项目超投资的原因,在此基础上提出了控制建设项目超投资的基本对策,并进行了具体阐述,以期达到投资控制制度化、投资行为规范化、投资效益最大化的目的。     

Application of Codes Performance‐Based Design Procedures for a Tall Building Using Recorded and Spectrally Modified Ground Motions

There is a growing tendency toward the performance‐based design of tall buildings, where any assessment using response history analysis requires a set of ground motion (GM) records. This paper considering a tall building as a case study investigates how judgment on the seismic safety of the structure is affected by the use of recorded or spectrally matched GMs. Three model structures are developed: (a) using conventional design procedure of Chapter 12 of ASCE 7‐16; (b) adopting linear analysis requirements of Chapter 16 of ASCE 7‐16; (c) designing for service‐level design earthquake of Los Angles Tall Building Structural Design Council (LATBSDC) procedure. It is shown that all of the structures give acceptable performance when subjected to simulated GMs, although this is not the case for amplitude‐scaled GMs based on ASCE 7‐16 and LATBSDC. Finally, to have an objective assessment of performance, independent of GM types, incremental dynamic analysis is employed to derive fragility and mean annual rate of exceeding (MAR). Results show that for anticipated drifts at Maximum Considered Earthquake (MCE) level, the structures provide acceptable MAR at the fundamental period. However, for the higher modes including the second and third periods, MAR values become acceptable only at drifts as large as 0.085.