Calibration of a hysteretic model for glass fiber reinforced gypsum wall panels

Glass fi ber reinforced gypsum(GFRG) wall panels are prefabricated panels with hollow cores, originally developed in Australia and subsequently adopted by India and China for use in buildings. This paper discusses identifi cation and calibration of a suitable hysteretic model for GFRG wall panels fi lled with reinforced concrete. As considerable pinching was observed in the experimental results, a suitable hysteretic model with pinched hysteretic rule is used to conduct a series of quasi-static as inelastic hysteretic response analyses of GFRG panels with two different widths. The calibration of the pinching model parameters was carried out to approximately match the simulated and experimental responses up to 80% of the peak load in the post peak region. Interestingly, the same values of various parameters(energy dissipation and pinching related parameters) were obtained for all fi ve test specimens.

Analytical Study of the Cable-Truss Systems on the Glass Certain Walls with Vertical Uses

The aim of this study is to analyze of the cable-glass systems which are used on the glass curtain wall according to their types, degree, architectural and structural effects. The suspended glass system with pre-stressed cable truss (SGSPCT) is widely started to apply after the 1980’s with Serres building. The advantages of these systems are to provide the transparency on the fa?ades and speedy construction process with minimum materials. The disadvantages are: more expensive than other systems and so many details for the joints and load distribution calculations. There are three different architectural design typologies of the SGSPCT system. These are distance bridging systems, between floor system and independent body. These three different typologies can be seen on the same building at the same time. This system has been known as complex structure systems. The twenty five glass buildings which are designed in different systems have been analyzed during this study. After these analyses the five glass buildings which are designed with cable-truss system have been selected for scope of the study. These selected buildings have been included of three different cable-truss system typologies and degree. The methodology of this study is literature survey and building analyses method. The written and visual documents involve books, theses, reports, articles, magazines, drawings, internet sources and applied connection details of the glass buildings. The selected five glass buildings have been detailed analyzed with their architectural drawings, photographs and details. The study consists of five chapters including the introduction chapter. The general information of the glass building and cable-glass system has been mentioned in the first chapter. The structural features, details and analytical information on systems have been explained of the selected buildings in the second chapter. The detailed analyses of these selected buildings have been done according to their schematic drawings with the plans, sections and load distribution in the third chapter. The fourth chapter is discussion section. In this section, cable-truss systems have been compared with their advantages and disadvantages to the other systems. The fifth chapter is the last chapter, many advantages of cable-truss systems have been concluded that the use of glass substrates.

Ecological Technologies of Applying Plants on Glass Curtain Walls

Integrated landscaping technology of reclaiming condensed water from the thermal channel of double-pane glass curtain wall and applying the reclaimed water in micro irrigation of natural plants was explored.Selection of plant species for the internal space of glass curtain wall and vertical greening outside was studied to meet the ecological technological requirements of glass curtain wall.Progressive experiment of new technology and simulated calculation of indexes were applied to obtain solar radiation consumption,meet the ecological characters of plants in glass curtain walls,and finally improve indoor and outdoor thermal environment.The results showed that new ecological technologies of applying plants on glass curtain walls help realize ecological utilization of glass curtain walls,further reduce energy consumption of buildings,achieve and even surpass the standards of national 3-star green buildings.

Optimized Simulation Design of Double Glass Curtain Wall Shading System in Hot Summer and Cold Winter Zone

The glass curtain wall is widely favored by the owners for its good appearance modeling efthct. In using process, however, excessive energy consumption, low level indoor eomtort and other problems of glass curtain wall are often exposed. Aiming at office buildings in hot Summer and cold Winter zone, taking the optimization of thermal comfort of double glass curtain wall in the summer and the reduetion of building energy consumption throughout the year as the breakthrough point, using the method of energy simulation analysis, through changing the size of internal shading component in the simulated room, this paper analyzes and summarizes the variation law of its energy consumption value, to explore the relatively reasonable design plan of shading systems of the building with glass curtain wall.

Nonlinear response spectrums for cable-supported glass curtain walls

Aiming at the seismic-resistant performance of cable-supported glass curtain walls,the methods for formulating nonlinear single degree of freedom system and calculating the nonlinear response spectrums are proposed. Taking pretension effect in cables and geometrical nonlinearity into account,the nonlinear acceleration spectrums are calculated under given conditions,such as site and different seismic fortification intensities. The seismic design response spectrums are developed. During vibrating,varying period due to the influence of pretension effect in cables and geometrical nonlinearity drives the maximum period of plateau in nonlinear response spectrums to move towards the long period zone,and the maximum of seismic effect coefficient is larger than that of current seismic code. The theoretical analysis and the example demonstrate that using the nonlinear response spectrums is safe and economical.

考虑风载因素的玻璃幕墙清洁机器人设计

围绕高楼玻璃幕墙机器人自动清洁中的风载问题,设计了一款考虑风载因素的真空吸盘吸附的框架式爬壁机器人。针对玻璃幕墙清洁机器人的框架式结构进行步态规划。基于空间力学理论建立了玻璃幕墙清洁机器人在风载下的力学平衡模型,得到了风载大小与机器人吸盘吸附力之间的力平衡方程。在Workbench中对风载作用下的清洗机器人本体进行了有限元分析,得到了机器人模型的应力云图与变形云图。实验测试结果表明:在极限风载作用下,机器人的最大应力点位于吸盘支架,最大变形点位于主架板中心。在真实风载下对机器人进行攀爬运动仿真分析,机器人可以在极限风载下稳定地工作,不会发生滑移和倾覆,验证了力学模型和设计模型的正确性。

基于Giannakoopulou模型的MWCNT/GF/EP复合材料微波吸收性能研究

探究了加入不同质量分数多壁碳纳米管的多壁碳纳米管/玻璃纤维/环氧树脂复合材料在X波段的电磁波吸收性能,基于Giannakoopulou模型引入透波层,研究了吸波层和透波层两者的比例和分布状态对吸波材料整体的吸波性能影响。结果表明,加入多壁碳纳米管质量分数为2%的多壁碳纳米管/玻璃纤维/环氧树脂复合材料在厚度为3.0 mm时,最大反射损耗为-44.5 dB,有效吸收带宽为3.3 GHz(8.2~11.5 GHz);通过合理设计吸波层和透波层两者的比例和分布状态,得到具有不同有效吸收带宽和吸收损耗峰值的吸波材料,反射损耗峰值最高达到-62.1 dB,有效吸收带宽为3.1 GHz。

城市空间艺术化与“表皮”美学

人类艺术最显眼的是建筑,它让公共空间注满意义,成为一个时代的哲学和文化精神的有力体现,它是城市之所以为城市的理由。对艺术产业的研究,必须包括对城市空间艺术特点的追问。可以看到,越是到后现代建筑,墙体越有可能分化成两层,外层“表皮”对城市空间艺术化起了重大作用。由于当代科技文化的发展,城市设计者与建筑学家可以比较自由地发挥艺术创作精神。在后现代符号美学推动下,城市空间的塑形高度个性化,由此可以比较灵活地解决民族风格与雅俗融合这两个元设计大难题。

17m超高坐地式玻璃肋幕墙系统结构性能和试验研究

文章以泰康大厦工程为背景,针对超高坐地式玻璃肋幕墙系统进行了大风压作用下的结构性能和位移能力试验研究,通过有限元、试验、理论三者进行对比分析。研究表明,该幕墙系统不仅满足1.75kPa风压作用下的结构性能要求和2.63kPa大风压下结构的安全性能要求,而且满足三个方向位移能力的要求。充分说明17m超高坐地式玻璃肋幕墙系统的设计方案安全可行,设计方案和试验结果可为今后超高坐地式玻璃肋幕墙系统的设计提供支持。

玻璃幕墙清洗机器人内螺旋完全遍历路径规划研究

针对高空复杂环境下玻璃幕墙清洗机器人的全方位无死角清洗问题,本文提出了一种基于改进蚁群算法的内螺旋完全遍历路径规划方法。首先在融合视觉传感器识别定位结果的基础上构建环境栅格地图;针对机器人全方位无死角遍历问题,以最大覆盖面积、最小重复路径及最大安全性为目标,通过内螺旋完全遍历算法实现清洗路径规划。在此基础上,针对机器人完全遍历易陷入死区问题,以最快规划、最少拐点及最快收敛为目标,通过改进蚁群算法规划出最优逃逸死区路线。改进方向以机器人4方位4领域移动为主,在启发函数中引入A^(*)算法的代价函数,同时在信息素更新中引入惩罚函数的思想。最后通过2种算法结合完成清洗区域的完全遍历,仿真结果表明:机器人在已知地图上通过4次规划后清洗覆盖率达到100%,行进重复率达到3.15%,实现了完全遍历。

负风压作用下隐框玻璃幕墙承载行为和脱胶损伤实验研究

隐框玻璃幕墙连接用的硅酮结构胶发生损伤导致玻璃面板坠落是当前幕墙服役过程中的常见问题.现有研究大多采用动力学方法对幕墙的脱胶损伤进行检测和评估,该方法通常需要额外施加荷载激励,且测量的动力响应数据易受环境影响,难以实现幕墙安全状态的可靠评估.为解决上述问题,提出在负风压作用下利用玻璃面板的挠度和转角对玻璃面板的脱胶损伤进行检测和评估的方法.首先,设计一系列隐框玻璃幕墙脱胶损伤实验,验证了在风荷载作用下利用挠度和转角对玻璃面板的安全状态进行检测的可行性;之后,基于实验结果构建了隐框玻璃幕墙安全风险监测评估系统,实现玻璃面板脱胶位置和数量的实时监测和快速识别.

某高层建筑幕墙玻璃面板的多源感知与特征提取初探

近年来,高层建筑玻璃幕墙面板因自爆、脱落等引发的安全事故在我国频频发生,其主要原因是幕墙面板的性能特征不清晰。论文提出了玻璃幕墙面板的多源感知与特征值提取方法,结合实际工程案例,通过设计施工资料、振动测试、图像识别3种多源感知方法获取玻璃幕墙特征信息,并从中提取出典型特征值。

玻纤质量分数对长玻纤增强聚丙烯水驱动弹头辅助注塑管件的影响

分别以玻纤质量分数10%,20%,30%和40%的长玻纤增强聚丙烯(LGFRPP)材料制取一系列水驱动弹头辅助注塑(W-PAIM)管件。探究了玻纤质量分数对玻纤断裂长度、纤维取向、壁厚以及耐压性的影响。结果表明,随着玻纤质量分数的增加,玻纤断裂长度在较长区间内占比降低;不同玻纤质量分数的W-PAIM制件在壁厚层的取向不同,水道层的玻纤沿流动方向取向较模壁层和中间层更好,当玻纤质量分数为10%与40%时,水道层玻纤取向度最好,玻纤质量分数为20%时,中间层取向最差,玻纤质量分数为30%时,模壁层的玻纤取向较好;随着玻纤质量分数的增加,WPAIM管件壁厚呈先增加后减小再增加的趋势;随着玻纤质量分数的增加,管件的耐压性先增加后减小最后又增加,当玻纤质量分数为20%时,耐压性最好。

基于深度学习技术的无人机玻璃幕墙缺陷检测方法

针对玻璃幕墙存在的各种缺陷问题,提出了一种基于深度学习技术的无人机玻璃幕墙缺陷检测方法。通过无人机搭载RGB相机采集玻璃幕墙缺陷图像并导入计算机中进行处理,利用改进的YOLOv5轻量型表面缺陷检测算法对玻璃幕墙缺陷图片进行分类识别,提高网络收敛速度和泛化能力;最后通过人工标注数据集对所构建的无人机检测系统进行测试验证,结果表明该系统能够完成玻璃幕墙缺陷图片的自动检测与识别。

基于改进最小二乘法的椭圆形玻璃幕墙缺陷多传感器融合检测技术

针对常规椭圆形玻璃幕墙缺陷多传感器融合检测的结果误差较大的问题,提出基于改进最小二乘法的椭圆形玻璃幕墙缺陷多传感器融合检测技术。在分析椭圆形玻璃幕墙受力点处应力值和反差增强分组传感器检测数据信号而获取缺陷部位的初始拟合曲线后,采用改进最小二乘法拟合缺陷部位立体位置曲线,融合缺陷检测图像得到检测结果。试验结果表明:应用该方法得出的检测累积误差平均值为0.07,可满足椭圆形玻璃幕墙缺陷的检测要求。

既有玻璃幕墙典型安全性问题分析

我国玻璃幕墙保有量居世界之首,既有玻璃幕墙的安全性问题已成为建筑行业乃至全社会关注的焦点。论文以玻璃面板爆裂脱落和开启扇坠落问题为切入点,从材料、连接构造、支承体系等方面出发,对既有玻璃幕墙典型安全性问题产生的原因和分析方法进行了探讨,以期为玻璃幕墙的使用、维护及鉴定评估提供参考。

木丝水泥填充墙-RC框架抗震性能试验研究

为研究木丝水泥填充墙-钢筋混凝土(RC)框架的抗震性能和破坏机理,共制作五个试件进行低周反复试验,其中一个试件为普通砖填充墙-RC框架对比试件,两个试件为开窗洞的木丝水泥填充墙-RC框架,另外两个试件为添加玻璃纤维网格布的木丝水泥填充墙-RC框架,并分析试件的滞回曲线、骨架曲线、延性系数、耗能情况与刚度退化等指标。试验结果表明,木丝水泥填充墙-RC框架的抗震性能良好,刚度退化速度远小于普通砖填充墙-RC框架,耗能能力在试件开裂后超过普通砖填充墙-RC框架;在木丝水泥填充墙-RC框架上开窗洞后会削弱其承载力,但破坏时裂缝只是沿四个窗角分别向四个填充墙角扩展,最终形成“X”形裂缝,而木丝水泥填充墙-RC框架与混凝土之间的粘结面未被破坏,在木丝水泥填充墙-RC框架表面加入玻璃纤维网格布后可以减少墙面裂纹的产生,且提高了极限承载力和延性系数,并抑制了刚度的快速下降。

用于光伏玻璃幕墙的聚光系统设计与研究

为了能同时满足光伏玻璃幕墙的采光和建筑发电需求,设计了一种由双抛物线结构和导光板组成的混合式聚光器。主要介绍了聚光器的构成,并对其性能进行了初步的测量分析。这种新型的聚光器的几何聚光比为6,系统效率在90%,通过比较不同单元模块宽度的聚光器和不同移动距离的聚光器模型,测量了变量与入射偏角的曲线,得到聚光器的接收范围为±3°。在垂直入射条件下,聚光系统的光伏模块效率可以达到70%,减少室内的眩光。最后使用DIALUX软件对新型系统采光进行了辐照度分析,全天辐照度超过300 lx,照度均匀度达到了0.956。结果表明聚光系统用于光伏玻璃幕墙是可行的,可以提高使用舒适度,也降低了建筑成本,该系统的实用性可以替代传统中空玻璃。

高楼玻璃幕墙清洁机器人结构设计

针对高楼玻璃幕墙人工清洁作业所存在的安全风险高、劳动强度大、作业效率低等问题,设计了一种可替代人工作业的玻璃幕墙机器人。根据实际高楼玻璃幕墙清洁的需求,设计出能实现高楼玻璃幕墙清洁的机器人。运用SolidWorks对清洁机器人结构进行几何建模,运用有限元分析软件对机器人的运动方式进行分析优化,利用3D打印的技术打印出高空玻璃幕墙清洁机器人结构。选择STM32芯片对舵机、真空泵、清洁机构的控制,实现清洁机器人的爬行、吸附、清洁等功能。利用真空泵实现机器人吸附在非水平面上,利用舵机控制机器人的腿部关节移动,利用滚刷实现对幕墙的清洗。基于仿真与实物实验,计算清洁机器人能在高楼玻璃幕墙上行走所需的吸附力参数,并选用相应的真空泵;计算清洁机器人爬行所需的舵机转动角度;在满足清洁需求的情况下,对清洁机构进行优化。设计的清洁机器人具有整体尺寸小、行走灵活、通过性强、应用场合广等特点,为高楼玻璃幕墙清洁作业提供了技术方案。

大型吊挂异形玻璃幕墙施工测量及安装技术研究

当前的玻璃幕墙钢立柱在安装时多为独立搭接,关联紧密度不高,导致幕墙容重无法达到预设标准,为此对大型吊挂异形玻璃幕墙施工测量及安装技术进行了分析和研究。采用放线控制的方式实现幕墙测量。以此为基础,对预埋件定位,采用分段形式,搭接钢立柱,安装异形玻璃板,使用边缘满焊处理的方式实现玻璃幕墙安装。结果表明:测定得出最终数值可以达到55 kg/m2,能较好地将单块幕墙的重量控制在50~60 kg/m2的最佳标准之内,说明在安装的过程中,幕墙的整体承重能力得到了明显提升,具有更强的荷载能力,安装及后续使用效果更佳。