Dynamic response characteristics of super high-rise buildings subjected to long-period ground motions

Spectrum characteristics of different types of seismic waves and dynamic response characteristics of super high-rise building structures under long-period ground motions were comparatively analyzed. First, the ground response wave （named LS-R wave） of a soft soil site with deep deposit, taking long-period bedrock seismic record as input, was calculated by wave propagation method. After that, a TOMAKOMAI station long-period seismic record from the Tokachi-Oki earthquake and conventional E1-Centro wave were also chosen. Spectrum characteristics of these waves were analyzed and compared. Then, a series of shaking table tests were performed on a 1：50 scale super high-rise structural model under these seismic waves. Furthermore, numerical simulation of the prototype structure under these excitations was conducted, and structure damages under different intensive ground motions were discussed. The results show that： 1） Spectrum characteristics of ground response wave are significantly influenced by soft soil site with deep deposit, and the predominant period has an increasing trend. 2） The maximum acceleration amplification factor of the structure under the TOM wave is two times that under the E1-Centro wave; while the maximum displacement response of the structure under the TOM wave is 4.4 times that under the E1-Centro wave. Long-period ground motions show greater influences on displacement responses than acceleration responses for super high-rise building structures. 3） Most inelastic damage occurs at the upper 1/3 part of the super high-rise building when subjected to long-period ground motions.

Effects of high modes on the wind-induced response of super high-rise buildings

For super high-rise buildings, the vibration period of the basic mode is several seconds, and it is very close to the period of the fluctuating wind. The damping of super high-rise buildings is low, so super high-rise buildings are very sensitive to fluctuating wind. The wind load is one of the key loads in the design of super high-rise buildings. It is known that only the basic mode is needed in the wind-response analysis of tall buildings. However, for super high-rise buildings, especially for the acceleration response, because of the frequency amplification of the high modes, the high modes and the mode coupling may need to be considered. Three typical super high-rise projects with the SMPSS in wind tunnel tests and the random vibration theory method were used to analyze the effect of high modes on the wind-induced response. The conclusions can be drawn as follows. First, for the displacement response, the basic mode is dominant, and the high modes can be neglected. Second, for the acceleration response, the high modes and the mode coupling should be considered. Lastly, the strain energy of modes can only give the vibration energy distribution of the high-rise building, and it cannot describe the local wind-induced vibration of high-rise buildings, especially for the top acceleration response.

Discussion on the Construction of Anti-smoke Construction Technology in Super High-rise Buildings

In recent years with the increasing number of super high-rise buildings and the ever-expanding scale the anti-smoke construction technology has attracted more and more attention.Based on this situation,this paper analyzes the smoke control technology of super high-rise buildings.The paper analyzes the importance of the application of anti-smoke construction technology in super high-rise buildings,analyzes the problems in the construction of smoke control and super high-rise buildings.The anti-smoke construction technology was studied and I hope that it can benefit the application of anti-smoke construction technology in high-rise buildings.

The Structural Behavior of Low/Medium/High Rise Concrete Office Buildings in Kuwait

The main concern of this paper is to provide an extensive study for the structural behavior of low/medium/high rise office buildings aiming to deepen structure and architect designers understanding for such type of buildings. The study is performed on reinforced concrete and emphasized only on Kuwait city conditions for wind. Regular layout plan building with different heights ranging from five to fifty typical office stories are investigated in this study. Three dimensional finite element techniques through ETABS software are used in conducting analysis for structures presented here-in. A serviceability study is performed to ensure that buildings have sufficient stability to limit lateral drift and peak acceleration within the acceptable range of occupancy comfort. In addition, an ultimate strength study is carried out to design and verify that all the structural elements are designed to withstand factored gravity and lateral loadings in a safe manner according to the international building codes. The building slenderness ratio and the building core size and location are the studied parameters since they are the key drivers for the efficient structural design. Analysis results are presented and discussed and finally conclusions are summarized as guidelines for designers of concrete office buildings in Kuwait.

超高层办公建筑暖通空调系统噪声控制分析

营造良好的室内声环境对人员身心健康至关重要。本文以某超高层办公楼为研究对象,分析了超高层办公建筑声学方面的特点、典型暖通空调系统的噪声传递途径;针对办公楼层剖析了声源降噪、隔绝机房噪声、办公区内空调末端及管道的噪声控制措施,并针对机电层的不同设备区域提出了相应的隔振、隔声、降噪做法。

深圳地区写字楼变风量空调系统设计总结

结合工程实例,详细介绍变风量空调系统设计过程,并统计深圳地区写字楼变风量空调系统设计案例及运行调试反馈,得出变风量空调系统组合式风柜选型建议,空调室内冷指标不宜小于120 W/m^(2),含新风冷指标不宜小于150 W/m^(2),机外静压不小于600 pa,单位空调面积送风量指标25~30 m^(3)/h/m^(2)。研究结果满足当前工作需要,对行业同类型项目有借鉴意见。

Collapse simulation of a super high-rise building subjected to extremely strong earthquakes

In recent years, super high-rise buildings (>500 m) are developing very quickly and become an important frontier of civil engineering. The collapse resistance of super high-rise buildings subjected to extremely strong earthquake is a critical problem that must be intensively studied. This paper builds up a nonlinear finite element model of the tallest building in China, Shang- hai Tower (632 m), and proposes the modeling method and failure criteria for different structural elements. The dynamic char- acters of this building are then analyzed, and the possible failure modes and collapse processes due to earthquakes are pre- dicted, as well as the corresponding collapse mechanism. This work will be helpful in collapse prevention and the seismic design of super high-rise buildings.

An improved ground motion intensity measure for super high-rise buildings

Ground motion intensity measure (IM) is an important part in performance-based seismic design. A reasonable and efficient IM can make the prediction of the structural seismic responses more accurate. Therefore, a more reasonable IM for super high-rise buildings is proposed in this paper. This IM takes into account the significant characteristic that higher-order vibration modes play important roles in the seismic response of super high-rise buildings, as well as the advantages of some existing IMs. The key parameter of the proposed IM is calibrated using a series of time-history analyses. The collapse simulations of two super high-rise buildings are used to discuss the suitability of the proposed IM and some other existing IMs. The results indicate that the proposed IM yields a smaller coefficient of variation for the critical collapse status than other existing IMs and performs well in reflecting the contribution of higher-order vibration modes to the structural response. Hence, the proposed IM is more applicable to seismic design for super high-rise buildings than other IMs.

上海市某超高层办公楼空调系统调适

通过详细检测上海市某超高层高档办公楼项目的空调供热系统和制冷系统的运行状况,确认了锅炉、冷水机组和相应水泵等设备运行使用中存在的问题。开展了空调系统调适,在不进行设备改造的情况下,通过整改设备运行问题和调整自控程序,解决了大楼冬季空调供热功能失灵的问题,并提高了制冷系统的节能性。根据新建和既有公共建筑机电系统调适项目的经验,提出几点建议,为其他项目空调系统的运行调适提供参考。

超高层办公楼空调系统设计实践

以地处夏热冬暖地区的福建省某超高层办公楼为例,阐述了以高效的一体化蒸发冷凝式冷水机组结合灵活、便捷的风冷多联式空调所构建的复合型空调系统。在冷水机组、管道及其连接方式的承压能力范围以内,空调水系统结合新风系统竖向分区进行设置,避免采用二次换热方式。在此基础上,合理地提高了冷水机组的水温,有效地提高了能源效率。结合空调冷负荷分析、典型年室外湿球温度频数统计结果可知:采用高温工况的一体化蒸发冷凝式冷水机组作为新风冷源,较常规的冷水机组、风冷多联式室外机作为冷源的方式,节能和减排的幅度较高,具有良好的示范价值。

上盖预留超高层办公建筑设计研究与应用

探讨了“上盖预留”开发模式,即预留建筑物下方空间,以建造上层建筑或设施。此模式满足轨道交通建设、管理和运营需求,降低未来扩建和改造成本及影响,提高城市土地利用效率和发展潜力。并以广州市棠溪项目为案例,深入探讨了如何规避现有不利影响,将上盖预留与超高层写字楼设计结合,为上盖超高层设计提供参考。

高密度“科创聚落”与城市的生长

当下,随着创新型城市建设的兴起,科创产业园区的数量十分惊人。这些园区担负着聚集创新资源、培育新兴产业、推动城市化建设等重要使命。海门数字经济产业园的设计实践,绝不仅仅是形式和功能上的突破,而是从普适性的角度,试图探索科创园区之于城市的意义,其本质在于打破封闭园区的固化范式、追求公共空间的共享和开放性,力求实现使用者的归属感和认可度,从而进一步激发片区乃至城市的活力。本文以海门数字经济产业园为案例进行分析,希望通过这一项目的成功实践,能为科创产业园区模式带来新的思考。

基于地域适应性的超高层办公综合体建筑实践探索——以广州南沙利通智汇晶谷项目为例

在全球化背景下,超高层办公建筑不断涌现,部分建筑为追求新奇夸张的外形,采用大面积玻璃幕墙,忽略了当地的地域气候与文化特征。结合项目实践,总结地域适应性在超高层办公综合体建筑设计中的应用策略,为超高层办公综合体地域适应性设计提供参考与借鉴。

超高层建筑空调水系统竖向分区设计研究

结合厦门某超高层办公楼的工程设计实例,综合考虑设备、管道、附件承压及建筑竖向分区等影响因素,对比分析了单冷源站,一次中间换热空调水系统;单冷源站,二次中间换热空调水系统;双冷源站空调水系统这三种空调水系统竖向分区方案的初投资、运行费用及优缺点,得出适合的超高空调水系统竖向分区方案。

多普勒超声心动图评价不同海拔高原驻守官兵心功能

目的比较驻守海拔2800 m官兵与海拔4820 m官兵的左心功能及右心参数变化差异,探讨海拔高度对高原驻守官兵心脏的影响。方法利用飞利浦便携CX50型超声诊断仪,对驻守海拔2800 m官兵33名(A组)和海拔4820 m官兵25名(B组)行超声心动图检查,重点检查左室短轴舒张末内径(LVDd)、左房收缩末左右径(LASd)、右房收缩末左右径(RASd)、右室舒张末左右径(RVDd)、肺动脉内径(PAd)、二尖瓣口E峰与A峰血流速度(MVE、MVA)、二尖瓣环舒张早期速度(E')、二尖瓣环舒张晚期速度(A')、肺动脉加速时间(PVAT)、肺动脉平均压力(PAMP)。结果 B组的MVE、MVA、E'、E'/A'均低于A组,LVDd小于A组,PAd及A'大于A组,PVAT明显小于A组,PAMP明显高于A组(P<0.05),两组RASd、RVDd无显著差异(P>0.05)。结论与低海拔高原驻守官兵比较,驻守超高海拔高原官兵左室舒张功能减低,PAd增宽,PVAT缩短,PAMP增加,表明超高海拔高原环境对驻守官兵的心脏有一定影响,应该制定相应的健康保障策略,以切实防止或减轻超高海拔高原对官兵健康的影响。

一个超高层商务办公建筑方案的设计

笔者于2002年9—10月参与了由浙江华丰房地产开发有限公司承担开发建设的温州市车站大道站前1-2#地块工程的建筑投标竞赛。现仅就自己在此设计中的思考过程与诸位同行共同探讨几个建筑设计中经常遇到的问题:建筑与场地的控制与制约关系,复杂的内部功能与外部形象的制约与反映,以及制约超高层商务办公建筑的形体因素, 这些问题将在论述中进一步详细展开和强调。

超高层办公楼建筑多专业协同BIM正向设计

随着BIM技术在国内的深度应用,如何应用BIM技术进行正向设计及利用BIM模型的三维直观特点辅助设计人员达成设计愿景是实现其价值落地的主要目标。作为深圳前海的标杆项目,民生互联网大厦项目利用多种软件,完成了精细化、标准化的建筑BIM设计。不同于传统的二维图纸和文档的设计沟通方式,基于BIM的三维模型可以更加直观地完成多专业沟通和协调,提高设计效率。BIM技术在本项目的主要应用点在Revit出图标准制定、BIM正向设计、BIM辅助设计、4D施工模拟,VR&AR等技术应用。通过深度应用BIM技术提高了设计质量,辅助设计人员减少设计错误及帮助业主实现管控目标。

超高层办公建筑电气设计

通过工程设计实例,介绍了超高层办公建筑的供配电系统、照明系统、防雷与接地系统以及谐波的抑制措施。阐述了超高层办公建筑电气设计的要点,以期对电气设计人员提供参考。最后介绍了屋顶直升机停机坪电气设计,可为具有类似屋顶停机坪的超高层建筑设计提供思路。

教职工健康体检1433例B超结果分析

从我校2003年1433例教职工健康体检作常规腹部B超检查结果显示:超声出现异常随年龄变化而发生改变。

招商银行上海大厦空调系统节能设计

该大楼为超高层办公楼。介绍了空调冷热源和风、水系统中所采用的节能技术和措施,包括冰蓄冷、水蓄热、地源热泵、冷却塔供冷、冷却塔风机可调、大温差供回水、水系统分区、水系统变流量调节、变风量全空气空调、排风热回收、可变新风量。