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.

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.

“最”字号土木工程的价值两面性

当今社会,“最”字号土木工程作为人们追求卓越的基建成果,代表了强盛的竞争力,推动着科技进步和社会发展,但也会带来很多负面效应。文章在对“最”字号历史工程的价值分析和现代超级土木工程价值两面性剖析的基础上,强调能够做到扬长避短、让“最”字号工程造福人类社会进步,才是负责任工程师的职责和终生追求。

超高层施工电梯布置关键技术

超高层建筑施工高度高,且往往工程量极大,这就导致施工电梯运输量也极大,垂直运输难题在超高层建筑施工时更加明显。为此,通过工程实践对施工电梯运输工程量进行计算,并列举不同的布置和选型方案优缺点,选出最适合工程项目的方案。同时,对超高层施工电梯中使用过程面临的一系列问题制定具体措施,为超高层建筑施工电梯设置及管理提供借鉴和参考。

BIM技术在超高层建筑工程深化设计中的应用

随着超高层建筑普及率的不断提升,传统建筑施工技术已经逐渐无法满足超高层建筑工程的设计施工需求,施工单位需要不断加强BIM技术等先进技术在超高层建筑工程深化设计中的应用,通过BIM技术来提高超高层建筑工程的设计水平,并在保证其设计质量的同时大幅度提升其设计效率,这样才能够更好地推动建筑行业的快速发展。因此,论文通过BIM技术的应用特点、BIM技术在超高层建筑不同施工阶段的应用,以及BIM技术在超高层建筑工程深化设计中的具体应用等几个方面的内容对其进行具体的研究分析。

钢结构在某房地产项目主体工程中的应用研究

与常规建设技术相比较,对超高层建筑的技术需求较大。通过对目前我国超高层建筑钢结构施工中常见的工艺及安装方法进行剖析,结合工程的特征及难点,对案例工程具体的安装工艺及方法进行论述,该文对超高层建筑钢构件的施工和安装技术进行探讨。

超高层建筑施工项目风险评估与应对策略探究

主要分析了超高层建筑项目施工中存在的风险,提出了评估风险与应对策略,并对超高层建筑施工项目的风险进行了分类。在风险评估方面,提出采用SWOT分析、风险概率和影响度评估以及风险矩阵分析等方法;在风险应对方面,提出采用风险规避、风险转移、风险控制和风险应对等策略。

大型超高层建筑工程中内爬式塔式起重机施工技术的应用研究

在现代社会的建设过程中,高层建筑的数量逐渐增多。在超高层建筑工程施工过程中,塔式起重机为主要的作业设备,由于塔式起重机本身具有较强的稳定性和安全性,故可对建筑物进行运输和安装等作业。但在进行超高层建筑施工时,由于建筑物结构复杂,尤其是高层建筑和超高层建筑间有较大的差别。因此,在对超高层建筑工程进行施工时,需要合理的利用内爬式塔式起重机施工技术对其进行施工,以提高施工效率。本研究针对内爬式塔式起重机施工技术进行了分析,促进超高层建筑工程的发展。

超高层钢结构建筑的施工技术控制要点

本论文探讨了超高层钢结构建筑的施工技术控制要点。超高层钢结构建筑的施工过程复杂,施工质量直接关系到建筑的安全性和可靠性。论文首先介绍了超高层钢结构建筑的特点和优势,然后分析了施工过程中存在的风险和挑战。接着,论文提出了施工技术控制的要点,包括项目管理、材料选择、施工工艺、安全措施和质量控制。最后,文章总结了有效的施工技术控制对于超高层钢结构建筑的成功施工具有重要意义,并提出了进一步研究的方向。

超高层建筑分段投测轴线精度的研究

本文研究了超高层建筑内控法分段投测轴线的方法。比较了分段投测和直接投测的精度,证明分段投测的优越性,计算了分段投测的最佳高度,提出了内控网变形的调整措施。并结合工程实例,证明了这些方法的有效性。

BIM技术在超高层建筑工程深化设计中的应用

北京绿地中心工程为超高层工程,引进了BIM技术,结合超高层工程体量大、专业多、协调工作复杂的特点,研究和总结出了一套集标准规范、协同流程、针对性方案以及深化成果实施保障机制为一体的以总包为核心的BIM深化设计模式和管理流程,提高了深化设计工作的精度与效率。

建筑外立面超高亮投影显示系统在上海世博演艺中心的应用

从介绍建筑外立面超高亮投影显示系统中采用的高亮度投影显示DLP技术出发,阐述了其如何在上海世博演艺中心建筑中得以实施和应用。模拟现场实景在夜间进行了投影试验,采用30000lmDLP技术的超高亮投影机将视频图像投射到建筑外立面,显示效果非常理想。

超高层ICCP安全监测与控制的预警指标研究

为了精确监控整体爬升平台(ICCP)的作业安全,探讨ICCP与超高层安全监控基本原理的内在联系和差异,收集哈利法塔、上海中心、台北101大厦等20个国内外超高层安全监测工程实例,统计和分析施工期和运营期的关键监测项目及指标,并对监测项目重要性程度进行分级,基于超高层建筑安全监测工程实例的统计分析结果和大量ICCP的工程实践,给出ICCP关键监测项目及预警指标;以塔楼最高为368 m的3座非对称连体塔楼超高层建筑为背景,通过现场试验验证ICCP安全监控项目和预警指标的合理性。结果表明:ICCP监测指标均处于合理范围,施工平台架体的水平度最终控制在20 mm以内;所提出的ICCP预警指标,有助于提高超高层施工的安全保障能力及信息化水平。

重大建设工程全程资金监管模式

上海中心大厦项目属特大型、多功能、超高层建筑项目,涉及多种业态,具有分支系统复杂、项目参建单位多、海量信息有效传递难度大、运用大量创新设计理念和应用以及成本控制难度大等特点。以上海中心为例,对其资金监管模式进行探索,分析如何提高重大工程建设资金的安全性和及时性,以达到资金绩效的最大化。

浅析大型LNG储罐建设的经济性——江苏LNG项目20万立方米全容式储罐建设实践

开发建设超大型LNG储罐,可增加单罐有效罐容,同时提高土地利用率,减少储罐建造的单位成本,是LNG工业技术发展的方向。对比中国石油江苏LNG项目16万立方米和20万立方米全容式LNG储罐的建设方案及成本,20万立方米全容式LNG储罐工艺设计有所变化,工程量有所增加,有效罐容提升了25%,但建设投资只增加了17.61%。超大型LNG储罐具有良好的社会环境效果和工程经济效益,将为我国LNG产业的发展提供新的思路。

BIM技术在武汉中心工程中的应用

武汉中心建筑高度438m,被称为华中第一高楼。施工中采用BIM技术,通过全过程项目管理的协同平台,用于参数化找形与幕墙设计、可持续性能化分析、平台化协同设计与交互,并解决了专业间碰撞等问题,实现了工程建设精品化和智能化的目标。

BIM+智慧工地数据决策系统在超高层项目管理中的应用

智慧工地是目前一种先进的支撑工程现场管理信息化手段,依托实际超高层项目管理实践,以施工阶段管理为主线,采用BIM+智慧工地的管理新模式搭建管理平台进行了质量、安全、生产等方面的应用实践,显著提升项目各方协同和现场精细化管理水平,实现了信息化综合管理,为BIM+智慧工地这种新技术在超高层工程中的实际应用提供了一定的参考。