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.

混合递归超分辨率图像重构ZHANGDi,PENGHong.Hybridrecursivesuper-

超分辨率图像重构是将多帧低分辨率图像重构成一幅高分辨率图像的过程。一般的超分辨率图像重构算法在小放大倍数时效果比较好,但当放大倍数上升时,存在两个问题:一个是计算复杂性的急剧上升,另一个是边缘振荡效应的加剧导致成像质量迅速恶化。提出了一个能同时解决这两个问题的基于POCS的混合递归重构算法,实验结果表明,该算法能够在提高重构图像质量的同时,较大地提高重构速度。

Super Characteristic Classes and Riemann-Roch Type Formula

The main purpose of this article is to define the super characteristic classes on a super vector bundle over a superspace. As an application, we propose the examples of Riemann-Roch type formula. We also introduce the helicity group and cohomology with respect to coefficient of the helicity group. As an application, we propose the examples of Gauss-Bonnet type formula.

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。

基于视觉传达技术的激光光斑图像超分辨率重建方法

激光光斑图像在成像过程中易受到成像条件和成像方式的限制,导致激光光斑图像的分辨率比较低,难以满足实际需求。为此,提出基于视觉传达技术的激光光斑图像超分辨率重建方法。采用视觉传达技术采集激光光斑图像,并使用双树复小波阈值方法对激光光斑图像去噪处理,通过改进稠密神经网络提取激光光斑图像特征,基于奇异值分解方法降低字典中原子的数目,改进稀疏表达正则化方法,实现激光光斑图像的超分辨率重建。实验结果表明,所提方法的低分辨率图像重建结果与原始图像更加接近,重建图像的结构相似度均在0.9以上,证明该方法的重建效果好、更适合实际应用。

从还原论到超复杂系统论:未来学校研究的方法论转向

当前未来学校研究受还原论视角影响,呈现出本体还原论、伦理还原论和时间还原论的研究取向。这一视角的优势在于“目的-手段”的高效性,但也使未来学校研究存在将要素重构等同于学校建设、忽视学校价值性以及把学校视为封闭系统等弊端。对此,作为对复杂系统论的完善与补充,超复杂系统论突破了还原论的局限。基于超复杂系统论,未来学校研究需要关注现实层次、时空体、相互作用以及预期四个特征,聚焦超复杂性,立足整体性、伦理性与预期性,建构系统的、合目的性的和开放的未来学校图景。

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。

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。

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.

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。

基于改进超邻接矩阵和熵权-TOPSIS的卫星互联网关键节点识别

“一星多用、多星组网、多网协同”思想的发展与应用为卫星互联网的关键节点识别带来了更多的挑战,也提出了更高的要求。针对卫星时序网络节点评估结果不准确的问题,考虑了不同时间片拓扑之间的耦合强度,提出了一种基于改进超邻接矩阵(supra-adjacency matrix,SAM)的卫星互联网时序网络模型。随后,综合卫星节点在网络中固有的拓扑特性和通信特性,选取特征向量中心性、介数中心性、节点紧密度、传输时延、传输速率和传输容量指标建立了节点重要度综合评估指标体系,在此基础上,基于熵权-逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)和时间权重矩阵设计了卫星互联网节点重要度评估方法。通过ARPANET和铱星星座进行仿真验证,实验结果证明了所提出的模型和方法能够准确地从局部和全局角度获得卫星节点重要度排序,并识别出潜在重要节点,对卫星互联网关键节点识别及抗毁性研究有一定的参考意义。

基于改进PageRank算法的超网络关键节点识别

针对超网络中关键节点识别算法识别分辨率不足的问题,将在复杂网络领域中利用邻接节点信息获得更好效果的PageRank算法改进并运用到超网络中进行关键节点识别,并实现了超图从关联矩阵到邻接矩阵的转换算法,降低了计算复杂度。文中在真实网络中与超图的超度、节点度、邻接信息熵等指标进行对比,实验结果证明了文中算法能识别出关键节点并且具有较高的分辨率。

超高层建筑穿插施工进度的系统动力学分析

超高层商业综合体穿插施工专业繁多,工艺复杂,常有多种不同因素相互影响,影响整体的穿插施工进度;而传统的进度管理分析方法少有考虑到施工中遇到多种工序同时施工、返工等问题。本文以疆一华庭项目为例,通过文献分析和结合工程项目实际经验,构建超高层商业综合体穿插施工进度影响指标,利用系统动力学方法,建立超高层商业综合体穿插施工进度分析模型,对不同因素下施工进度效率进行仿真分析。结果表明,施工过程对穿插施工影响较大,管理者们应当控制不同工序的进场施工时间,合理安排穿插时间。

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。

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。

浅谈复杂功能下的超高层核心筒设计——以成都新希望D10地块天府项目为例

随着现代化进程加快,城市基建用地逐步减少,复杂性的城市综合体逐步成为城市建设的首选。建筑功能从平面化到垂直化的发展,伴随而来的是一系列新的建筑设计的问题,尤其是超高层建筑的核心筒设计难题。文章以某超高层项目为例,浅谈在复杂功能情况下的超高层核心筒设计。

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。