箱形横梁的水压爆破拆除

某电影院大厅内钢筋混凝土箱形横梁长25m,断面尺寸1 6m×2 4m,用水压爆破拆除。通过梁的受力分析得知,为避免横梁的挠度过大,在吊梁拆除后必须另补支撑,以确保水压爆破正常进行。文中对水压爆破炸药用量的计算公式进行了比较和简评。在参考计算结果和考虑厅内环境的基础上,并结合以往水压爆破工程的经验,确定了合理、有效的药量,保证了主体结构的绝对安全。     

Reconstruction of the Grenfell Tower fire – Part 4: Contribution to the understanding of fire propagation and behaviour during horizontal fire spread

The tragic events at Grenfell Tower in 2017, involving a combustible façade system, have raised concerns regarding the fire risk that these systems pose. In this series of articles, so far published, fire development inside the initial apartment has been investigated using an appropriate computational fluid dynamics (CFD) model. Several scenarios including different fire sources and ventilation conditions were addressed. Fire propagation through the window to the external façade and to higher apartments was modelled. This model was validated by comparing the numerical results with the visual observations reported in the Grenfell Inquiry. A CFD model of the complete east face of the Grenfell Tower was then created. This paper details CFD modelling of the complete Grenfell Tower façade during the late horizontal phase of fire spread. As the physics of lateral flame spread is different from that for upward flame spread, it is important to assess the validity of the model, thus far developed, for this configuration. Fire propagation over the whole façade is modelled and compared with observations from the real disaster. This provides a better understanding of its fire behaviour and of the contribution of architectural details and their impact on fire spread.     

The Impact of Tower Internals on Packing Performance

The overall tower performance is influenced by the type of both tower internals and random packing. The Raschig GmbH's most recent development is the Raschig Super‐Ring^®, the fourth generation of random packings. In 1998, the Raschig Super‐Ring No. 2 was tested at the facilities of Fractional Research Inc. A significantly improved capacity and pressure drop over other random packing was observed without reducing the efficiency. A recent retesting of Raschig Super‐Ring No.2 using new tower internals revealed that the revised tower internals further improved the performance. Raschig has noticeable experience in designing liquid distributors.     

用于氮氧化物处理的填料塔的设计

选用填料塔对草酸生产过程中产生的氮氧化物进行吸收处理。对填料塔本体进行了设计计算,结合已有的工程设计经验给出了确定填料塔本体尺寸的具体步骤,并讨论了设计应考虑的主要问题。所采用的工艺有效地降低了生产过程中氮氧化物的排放,降低了生产成本,减少了环境污染。     

河南电视塔体形系数CFD数值模拟及随机风振响应数值分析(II)

建立电视塔的风振内力响应计算有限元模型,基于谐波合成法数值生成电视塔各分段的风波时程,采用ANSYS结构分析程序数值计算各风偏角下结构的动力响应,确定该电视塔不同高度上的风致振动位移响应、内力响应,给出了基于位移等效的动力放大系数与基于内力等效的动力放大系数。     

铁投·碳汇大厦结构设计

铁投·碳汇大厦项目由超高层商务办公塔楼及碳交易大厅裙楼组成,塔楼采用钢筋混凝土框架-核心筒结构体系,裙楼采用钢框架结构。因建筑功能需要,塔楼和裙楼连为一体形成多项不规则,属于不规则超限高层。采用YJK及ETABS软件对结构进行建模计算及指标对比,经计算,结构的各项指标均满足设计要求。采用Perform-3D软件对结构进行了动力弹塑性时程分析,表明结构在罕遇地震下损伤程度符合设计要求。针对裙房双向大跨度楼盖进行了人行舒适度分析及抗连续倒塌分析,结果均满足设计要求,且进一步确保了结构的舒适性及安全冗余度。     

悬索桥主塔结构的有限元模拟方法研究：1．初始模型

在有限元模型误差来源分析的基础之上,以润扬悬索桥主塔结构环境振动测试结果为基准,提出了分层次分阶段的修正主塔结构有限元模型的方法。首先依据设计图纸建立最初的有限元模型,经过模型阶次误差分析和结构误差分析之后,确定了主塔各构件单元划分的数目和梁柱节点刚性区域的模拟方法。在此基础之上,文献[1]将进一步对本文所建立的初始有限元模型进行参数误差的修正,从而最终建立润扬悬索桥主塔结构的基准有限元模型。     

某车载式可升降微波塔的抗风分析

本文以某车载式可升降微波塔架为工程背景,分别运用拟静力法和计算流体动力学方法(CFD)计算该微波塔架的风荷载,利用SAP2000工程软件建立了该微波塔架的三维空间有限元模型,分析了静力风荷载作用下结构的位移响应和部分构件的内力响应,并对该种车载式结构提出了合理的改进意见。     

钢结构电视塔塔楼在竖向地震作用下的反应分析

多功能钢结构电视塔均有塔楼，塔楼悬挑结构在竖向地震作用下反应较大，本文以青岛电视塔的碟形塔楼为例，采用反应谱振型分解法计算结构的动力特性和塔楼结构在竖向地震作用下的地震作效应，并找出塔楼的竖向地震影响系数，最后得出结论并提出建议。     

广州新电视塔检测及监测技术概述

广州新电视塔是目前世界上在建的最高建筑物之一,其结构复杂,施工、设计等技术难度大,涉及的检测项目较多,甚至有部分检测参数技术指标已超过目前相关现行标准的要求范围.本文主要介绍了本工程的特点,并对相关的检测技术、结构健康监测技术及检测工作管理模式进行了详细阐述.