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.

Exact solution of free vibration of adjacent buildings interconnected by visco-elastic dampers

With consideration of a high-rise coupled building system,a flexible beams-based analytical model is setup to characterize the dynamic behavior of the system.The general motion equation for the two beams interconnected by multiple viscous/visco-elastic dampers is rewritten into a non-dimensional form to identify the minimal set of parameters governing the dynamic characteristics.The corresponding exact solution suitable for arbitrary boundary conditions is presented.Furthermore,the methodology for computing the coefficients of the modal shape function is proposed.As an example,the explicit expression of the modal shape function is derived,provided only one damper is adopted to connect the adjacent buildings.Finally,to validate the proposed methodologies,three case studies are performed,in which the existence of the overdamping and the optimal damping coefficient are revealed.In the case of using one damper in connecting two similar buildings,the estimating equations for the first modal damping ratio are formulated.

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.

超高层建筑综合体消防负荷供配电系统设计

结合现行国家、行业及地方规范、标准,对超高层建筑综合体的消防负荷供配电系统、柴油发电机选择等设计方法及设计要点进行详细探讨。

基于BIM的超高层复杂钢结构施工技术研究与分析

为探讨BIM技术在超高层复杂钢结构施工中的应用,提出优化方案。采用文献综述法,阐述BIM技术的基本概念和原理,并探讨其在超高层建筑和复杂钢结构施工中的应用。通过建立BIM模型,研究BIM技术在施工过程中的应用,包括施工过程优化和效率提升。研究结果表明,BIM技术能够有效解决超高层复杂钢结构施工中的难点和安全问题,并提高施工效率和质量。

深圳湾创新科技中心超高层连体结构动力弹塑性分析

深圳湾创新科技中心为超高层连体结构,不设加强层。选用ABAQUS和Perform-3D软件,基于不同力学模型和分析假定,对结构进行了大震下的弹塑性时程分析;接着对比分析了结构在地震作用下整体指标、层间位移角、层间剪力、顶点位移时程、基底剪力时程、能量耗散和结构塑性损伤情况。结果表明,复杂连体结构采用多种软件进行动力弹塑性分析是必要的。鉴于此,提供了Perform-3D和ABAQUS两种软件的弹塑性分析方法及思路。

超高层建筑复杂地下室外墙施工关键节点处理

随着单侧钢模工艺在地铁车站的外墙及民用建筑的地下室外墙中的应用,需要解决地铁车站中罕见复杂节点的处理难题。针对某复杂超高层项目,对楼板开洞/集水坑、无钢模支架支设空间、梁与外墙相交、楼板升板等钢模关键节点的施工方法进行了研究,提出了4种单侧钢模外墙关键节点的处理方法,相关成果为基于单侧钢模工艺的民用建筑地下室外墙施工提供了建议和指导。

超高层异形综合体防雷设计研究

针对现阶段超高层异形建筑防雷接地设计进行了总结和分析。现场踏勘了本项目及其周边400 m范围内的建筑坐落情况,分析了本项目防雷接地的设计方案,总结了异形建筑防雷接地所应考虑的等效面积、防雷接地措施等必要条件,通过计算年预计雷击次数和查询各地防雷办参数,本项目展开防雷工程设计研究,研究方式及结果将对项目自身防雷设计具有复核及完善价值,并增强了建筑物防雷可靠性。

探讨复杂高层与超高层建筑结构设计要点

随着我国城市化进程的加快,土地资源日益紧张,高层和超高层建筑成为解决土地资源短缺的重要手段。复杂高层与超高层建筑结构设计是建筑领域的难点和热点,复杂高层与超高层建筑结构设计主要用途是办公、写字楼等。文中从结构设计的基本原则、关键技术和设计要点等方面进行探讨,以期为我国复杂高层与超高层建筑结构设计提供参考。

超高层办公消防水泵分期控制案例研究

以某超高层建筑群为例,探讨在项目不同建设阶段和交付周期中,消防给水系统的供水方式以及水泵连锁工作状态的转换方案。通过分析不同阶段的分期交付中,分段临时高压供水方式和常高压供水方式的电气消防联动、连锁控制的技术要点,针对性探讨该领域的技术落实和实际应用。

某超高层建筑复杂塔冠结构设计分析

通过分析超高塔冠侧面开洞方案对框架-核心筒超高层结构的影响,并结合风洞试验结果,开洞方案能有效减小风荷载的体形系数。利用欧拉公式,确定空间扭转格构柱的长细比,最后通过SAUSAGE和MIDAS GEN有限元软件,对塔冠结构抗震性能和钢管结构的节点做细致分析。由于塔冠的风荷载直接影响到主体结构是否要增设加强层,目前对于此类项目造型,规范和现有研究均未明确风荷载取值。研究结果表明,通过对塔冠立面开洞处理,可以减小相应的风荷载,提高主体结构的经济性;复杂塔冠节点具有较高的安全性,整个塔冠结构具有更高的可靠度。

超大直径盾构隧道穿越并列布置建筑群影响分析

以上海市超大直径盾构隧道北横通道下穿建筑群工程为研究背景,采用数值模拟和现场监测相结合的方法,对隧道穿越过程中建筑沉降进行分析,并在此基础上根据现场建筑排列特点建立并列布置建筑群,通过设计4种不同穿越工况,研究盾构穿越建筑群时地表沉降和隧道上方单幢建筑沉降受周围建筑影响规律。研究结果表明:侧穿区域内建筑对地表沉降曲线影响较小,下穿区域内建筑引起地表沉降曲线呈现非对称“V”形;建筑群对地表沉降主要影响区域为隧道轴线两侧2D范围,施工过程中应对该范围进行重点监测;侧穿区域内建筑对隧道轴线另一侧建筑沉降有抑制作用,下穿区域内的建筑对隧道上方建筑扰动较大;隧道穿越建筑前,纵向方向的建筑群对该建筑的隆起变形有抑制作用,穿越后,纵向方向的建筑群对该建筑的沉降影响更大;建筑纵向倾斜率随盾构开挖进程变化较大,盾构穿越过程中应重点关注建筑纵向倾斜变化。

超大城市综合体建筑防火设计与消防安全管理分析

介绍了超大城市综合体建筑中火灾的特点,强调以实际情况为基础进行合理的防火设计,同时提出符合实际的消防安全管理工作建议,促使超大城市综合体建筑中的防火设计更加优化,内部消防安全管理水平进一步提升。

一种用于超高层建筑施工的内外组合整体提升脚手架

针对结构外立面复杂、存在内外凹凸的建筑结构,常规的整体提升脚手架在结构变化时难以满足安全施工要求的问题,以传统附着式升降脚手架为基础,研发形成了内外双层组合整体提升脚手架。新型脚手架可以满足超高层结构不同外立面的施工要求,增加了施工作业面,提高了施工安全性,避免了在结构收缩处重复安装拆卸脚手架的施工隐患,有较好的应用推广价值。

郑州国际文化交流中心酒店结构设计

郑州国际文化交流中心酒店地上9层,地下2层,地上分为A区、B区两个结构单元,均为复杂超限高层建筑。主体结构均采用钢筋混凝土框架-剪力墙体系,关键部位采用型钢混凝土或全钢结构。A区有跨度为23.7~25.3m的弧形转换,采用弧形型钢混凝土转换梁;B区在3层~屋面有11.3m的超长悬挑,采用双层斜拉杆体系。分析了结构整体性能,明确了结构关键部位,选取并验证了中震、大震下的性能化目标,采用大震弹塑性时程分析揭示了结构薄弱部位并采取了针对性措施。专项分析了弧形转换梁的抗扭能力和应力分布,超长悬挑区的楼板作用、节点应力、抗连续倒塌能力,并提出了加强措施。分析结果表明,结构设计满足规范要求,并具有良好的抗震性能。

华润太原万象城结构设计

华润太原万象城属于大型城市商业综合体建筑,采用了钢筋混凝土框架-剪力墙结构体系,基础采用桩基础加防水板,楼盖为现浇钢筋混凝土梁板结构,屋面多个功能区采用了大跨异型钢结构采光顶。经分析判断,该结构为存在扭转不规则、大跨度梁、长悬挑梁、转换梁、楼板弱连接、穿层柱、结构平面超长等不规则类型的超限高层建筑。从结构体系与布置、超限情况分析、主要设计措施、结构抗震计算等方面进行介绍,全面讨论了该项目结构设计过程和方法,结果表明本项目结构设计的相关措施和计算具有有效性和合理性。

商业综合体武汉梦时代广场结构设计

武汉梦时代广场地上结构通过设置三道防震缝分为A区、B区、C1~C2区、C3区四个部分,其中A区、B区和C1~C2区均属于特别不规则的超限高层建筑。对超限结构进行了小震、中震和大震作用下的计算分析,结果表明整体结构均能满足预设的抗震性能目标。阐述了结构设计中遇到的超长混凝土结构、罕遇地震作用下剪力墙损伤严重、建筑高度判定、跃层柱稳定分析等难点。通过分析各区混凝土屋面以上结构的质量对下部结构地震剪力的影响,对各区的结构高度进行了合理判定。通过楼板温度应力分析及跃层柱的屈曲稳定分析,得出如下结论:楼板设计时应根据温度应力分析结果进行针对性加强,跃层柱稳定承载力满足要求。