为实现大跨度无柱空间及中部上隆的建筑形态,对临沂启阳机场航站楼屋盖结构采用单、双层混合曲面三向网格体系.该屋盖结构总平面尺寸为243 m×180 m,其中单层网壳尺寸为72 m×48 m,曲面形状通过数值逆吊找形获得.整体屋盖由56根斜柱支撑,最大跨度约为83 m,最大悬挑约为20 m,柱顶支座采用固定铰支座和单向弹性铰支座两种型式.针对屋盖结构的特点,采用数值模拟进行了静力性能分析、整体稳定性全过程分析、抗震分析及关键节点分析.分析结果表明:由数值逆吊确定的单层网壳主要通过面内路径传递荷载,同时双层部分可提供较理想的边界支撑条件,使单层网壳面内力能够可靠传递,整体结构受力合理;空侧设置20个单向弹性铰支座能够调节刚度不均匀引起的扭转效应,同时能够较好的释放温度变形,降低结构温度应力;为确保安全,在进行整体稳定性全过程分析时,考虑了多种初始缺陷模态及温升的不利影响,屋盖结构整体稳定性安全系数为2.88;罕遇地震作用下,单层网壳具备较高的安全储备,杆件损伤主要发生在网格高度较大的双层区域及悬挑区域,且塑性发展程度较低;单层网壳和单、双层网壳过渡区的关键节点具备适宜的安全储备,满足强节点的设计原则.

1)剪去不能恢复生机的枝条,加强土肥水管理,促使尚有希望的枝芽萌发整齐,促进新梢健壮生长. 2)受害较严重时,应大量疏剪花序,减少结果或不让结果以恢复树势.

The features of harsh natural environment,tall and open structure,combined technology,multi-systems and multi-functions were demonstrated for Hainan International Convention and Exhibition Center.The structural system selection method of the overall system and sub-systems of the convention center were introduced.The bonded prestressed technique is adopted for cantilever beams and floor beams with large span and heavy loading,while the unbonded prestressed technique is adopted for the tension section of cantilevered stairs.Finite element method was used to analyze the comfort levels of large cantilevered stands,large span floors and spiral stairs.The combined pile-anchor foundation was used to avoid the overturning moment of exterior columns due to the interlayer effect.

<正>UED:请简单介绍您对BIM的理解与认识。于洁:BIM是一种产业升级,是一种新型的设计方法和设计工具。就中国移动国际信息港项目来说BIM设计团队由全专业设计人员组成,经过大家共同努力,实现了"模型等于图纸""模型高于图纸"的目标。符合各阶段出图标准的图纸由设计模型直接打印,完成报批和施工。全专业全过程运用BIM的设计方法带来了对于设计流程再造的思考。我们着眼于BIM工程设计、协同设计以及BIM技术的研究拓展以关注质量和提高效率为中心,优化并局部修改了传统的设计流程。这是基于项目又高于项目的设计成果。

<正> 企业内刊应该成为企业管理的工具现阶段企业内刊如何发挥传播企业文化、凝聚企业归属感、传达企业战略的目的?企业内刊的现状如何?它们正做或该做哪些转变? "内"与"外" "一本好的企业刊物能够实现三‘招’;它可以‘招’一

<正>淡水白鲳以其肉质好、生长速度快、粗养易管、市场销量大等优点而深受广大养殖户的欢迎,但由于淡水白鲳属暖水性鱼类,生长适温为15～30℃,当水温低于12℃或高于36℃时,都会引起死亡。

A novel ring-beam connection is proposed for steel reinforced concrete(SRC) columns and RC beams.The force transferring mechanism is as follows: the shear forces and moments of the RC beams were firstly transferred to the ringbeam connections and then to the SRC columns.A series of monotonic static tests were conducted to verify the applicability and effectiveness of the ring-beam connections.In the tests,vertical loads were firstly applied to the tops of the columns to simulate the effects of the gravity,and then forces were exerted to the beams.The results from the tests show that the ring-beam connections with appropriate design can satisfy strong connection weak beam requirement.Simple design methods are suggested based on the test results.

Structures will enter nonlinear stage during strong earthquakes.Hence accurate prediction for the structural nonlinear behaviors is important to the safety and loss assessment during earthquakes.This paper reviews the existed nonlinear analytic models for structures and presents some novel models for structural nonlinear analysis that recently developed by the Tsinghua university.With these models,the material stress-strain relationship can be connected directly with the force-displacement behavior of the structural elements.So that the complicated coupled axial force-bending moment-shear force behaviors can be properly simulated,as well as the corresponding cycle behaviors.With the secondary development user subroutines,convenient pre and post process functions and extinct nonlinear capacity of general purpose FE software of MSC.MARC,the spatial seismic responds of structures can be precisely simulated.A steel frame-core wall structure with an eccentric tube is analyzed with static pushover and dynamic time-history analysis to demonstrate the applications of the new models.

古代九大奇迹是古代的建筑物和塑像,它们以其规模、美丽或独特的建造方式令人惊奇不已.古代七大奇迹的名册编制于公元前3世纪.按今天的标准,我们或许会认为,这七大奇迹就规模而言并非特别引人注目.

<正>成功人士始终用最积极的思考和乐观的精神支配和控制自己的人生。失败者刚好相反,他们的人生是受过去的种种失败与疑虑所引导和支配的。

<正>一、主要原材料80目单丝绢网, XS-Ⅱ型重氮感光胶,HF-印金粉,珠光粉专用粘合剂,金葱粉,方木,玻璃,图钉,铁钉及各种红色春联专用纸张。以上原材料可在全国各地的印刷材料商店、化工商店、工艺品材料商店或日杂商店购买。

Jinding Building is composed of two towers above the ground and a four-level basement.The design of foundation,basement floor,structural schemes of the towers is optimized based on structural reasonability,cooperation among different specialities,convenience for construction and satisfaction of the owner.The design of gravity beams of typical level and cantilevered steel stairs is also optimized from different points of view.Steel frame-reinforced concrete corewall structural system is promising in high-storey building.The spiral arrangement of the tube fillers is reasonable for load transfer of basement hollow concrete floor.The conclusion is useful for other projects.

孤军深入越南腹地 1999年2月,我们派了一个小组到越南,通过半年的努力拿到执照,1999年10月开始营业.应该说形势还是比较喜人的.1999年10月开始业务时我们只有一款机型,到2000年我们的市场占有率已达5%,2001年10月份,我们的彩电已经占了越南9.5%的市场份额,2001年截止到10月份,赢利40万美元.现在越南公司共有员工361人,其中347名越南人,14名中方派驻人员,工厂250人,销售100多人.