轻钢龙骨房屋抗震性能研究(Ⅱ)——IDA分析

基于数值拟合的滞回曲线和骨架曲线模型,运用增量动力分析法,对结构进行了国内外20条地震记录作用下的动力分析,研究了轻钢龙骨房屋的抗震性能.研究结果表明:轻钢龙骨房屋结构具有承载力高、延性适中、抗震性能好等优点,能够作为普通住宅结构运用于我国广大的抗震设防地区.     

轻钢龙骨混凝土组合外挂墙板抗震性能试验研究

为研究轻钢龙骨混凝土组合外挂墙板的抗震性能,对两块足尺墙板试件进行了低周反复荷载试验,得到了墙板的破坏形态及滞回曲线.试验结果表明:墙板破坏主要为拉板式约束节点处水泥纤维板的开裂和地龙骨腹板的扩孔,墙板与钢框架连接节点区域未发生明显破坏,说明在该连接节点达到层间位移角限值时,墙板仍能保证较好的整体性,与结构主梁之间连接...     

C型轻钢龙骨墙柱动力性能的数值模拟分析

C型轻钢龙骨柱是轻钢龙骨墙中的主要承重构件,选取四类有代表性的截面形式,通过ANSYS对C型轻钢龙骨柱外包OSB板在低周反复荷载下墙柱的受力性能进行数值模拟分析,分析了轴压比、柱高、柱距、宽厚比对墙柱滞回性能的影响。结果表明,在不同的轴压比、柱高、柱距下,墙柱的承载力与截面的宽厚比并非呈简单的线性关系,需要综合考虑构件的屈曲等相关因素。     

抗震试验中多自由度结构的滞回曲线分析

介绍了单自由度和多自由度结构滞回曲线的物理意义和特点,分析了结构滞回曲线和"自由度滞回曲线"所表达物理意义的不同,以及如何正确绘制多自由度结构的滞回曲线。最后以一个两自由度结构抗震拟动力试验为例,说明如何绘制多自由度结构的滞回曲线以及根据滞回曲线计算结构耗能的方法。     

轻钢密立柱墙体滞回性能研究

利用ANSYS有限元程序，对轻钢密立柱墙体在低周往复荷载作用下的受力性能进行分析，研究OSB板厚、墙体长高比对轻钢密立柱墙体滞回性能的影响。分析结果表明：在墙板厚度较薄时，墙体的动力滞回性能主要取决于墙板自身；墙板较厚时，墙体的动力性能较大程度上取决于骨架的性能；各高度下墙体随长高比的增大，破坏荷载相应增大，极限位移随长高比的增大递减。     

轻钢泡沫混凝土组合墙抗震性能研究

为研究不同斜撑布置形式对型钢泡沫混凝土组合剪力墙抗震性能的影响,通过低周反复试验研究轻钢与泡沫混凝土组合墙体中斜撑布置形式对结构的影响,设计了X型、双X型和菱型的斜撑形式,制作了3个足尺寸轻钢泡沫混凝土剪力墙试件,并根据试验现象与结果分析了不同构件的滞回曲线、骨架曲线和耗能曲线等,得出结果表明,承载力方面,X型与双X型斜撑构件比菱型斜撑构件分别提高了7.6%、18.4%;延性方面,X型斜撑构件比菱型和双X型斜撑构件分别提高了6.0%、15.1%,为轻钢与泡沫混凝土组合墙体研究提供参考。     

新型轻钢龙骨结构多层住宅抗震性能分析

选用实例住宅,按新型轻钢龙骨结构进行布置,对结构的蒙皮进行了简化,采用SAP2000软件对所建模型在Ⅰ、Ⅱ类场地,第一组,9度“多遇”、“罕遇”水准下的抗震性能进行时程分析.分析结果表明:在抗震设防地区的多层住宅采用新型轻钢龙骨结构是完全可行的,该结构在用钢量方面具有优势.     

钢筋混凝土框架滞回曲线的计算模型

《建筑抗震设计规范》(GBJ11-89)要求对几类结构进行弹塑性变形验算,但是人们在具体计算中难于找到一个简单实用的钢筋混凝土滞回曲线的计算模型,本文提出几种钢筋混凝土框架滞回曲线的计算模型,帮助从事工程抗震的科研设计人员进行该类结构的弹塑性分析。     

C型轻钢龙骨墙柱抗侧受力性能的数值模拟分析

轻钢龙骨住宅中主要的承重构件是C型轻钢龙骨墙柱,在此先通过ANSYS对C型轻钢龙骨柱外包石膏板墙柱的抗侧受力性能进行数值模拟分析,与北新建材试验进行比较,得出建模方法是可行的。然后研究不同跨度比、墙体长度和钢带支撑等因素对墙柱抗侧受力性能的影响。结果表明,跨度比对墙柱抗侧受力性能影响不大,在一定范围内墙体长度越长墙柱抗侧承载力越大,墙柱骨架中增设钢带能提高墙柱承载力。     

我国轻钢结构住宅体系发展探讨

介绍了国内外轻钢结构住宅的结构体系,并对每种体系进行了结构分析,通过相互比较阐述了各自体系的特点,针对我国轻钢结构住宅所面临的问题,从技术研究、市场推广等方面提出了发展轻钢结构住宅的新思路。     

钢支撑滞回曲线的模拟方法

钢支撑滞回曲线主要有三种模拟方法:现象描述法、有限元法和塑性铰法。在分析了各模拟方法优劣的基础上,提出一种新型的基于现象描述法的支撑模型。该模型通过一系列控制参数来包络钢支撑复杂的滞回曲线,并根据已有的同类型支撑试验结果标定控制参数。研究表明,该模型具有较高的模拟精度及计算效率,解决了早期基于现象描述法支撑模型模拟结果较为粗糙的问题。此外,为研究通用性更高的支撑模型,还提出了一种纤维支撑模型。该模型在跨中引入初始几何缺陷以模拟钢支撑的屈曲及屈曲后滞回特性,模型参数仅涉及支撑的几何及材料特性而易于确定。分析表明,该模型能满足多尺度整体结构分析的精度要求。两种模拟方法可应用于带支撑结构的地震反应分析和设计。     

钢结构住宅体系及性能研究

针对钢结构住宅框架结构进行有限元建模,并在大型通用有限元分析软件ANSYS下运用APDL语言进行编程计算,分析了框架体系在不同梁柱截面、跨距和层高等因素下的性能表现,对于钢结构住宅的设计起到一定的借鉴作用。     

Shear capacity of cold-formed light-gauge steel framed shear-wall panels with fiber cement board sheathing

Being light in weight, cold-formed steel shear wall panels (SWPs) made with light gauge steel are extensively used in residential and office buildings (low to mid-rise), particularly in structures under seismic loadings. Many design practices involve the use of fiber cement board (FCB) as sheathing material both for hollow and infilled walls. FCB is a preferred choice as cladding material due to many advantages it provides such as water resistance, lower cost, withstand temperature variation, resistance to humidity and termite attack, better acoustic insulation, and superior fire resistance properties. In the absence of design guidelines, based on cold-formed light gauge steel shear walls with FCB sheathing, the designers resolve to use the guideline available for gypsum wall board (GWB) and fiberboard (FB) available in American Iron and Steel Institute Lateral Design. As a pioneer study, an experimental program was designed to investigate the behavior of cold-formed light gauge steel shear walls, both hollow and infilled with expanded polystyrene (EPS) foam concrete, with FCB sheathing on both sides under monotonic loading. The tests were performed according to ASTM E564 standard. Results show that the strength of shear walls with FCB sheathing is much higher than GWB and FB sheathing, suggesting that substitute design practices are highly conservative. Test results can help designers choose desired lateral stiffness and load carrying capacity of light gauge steel SWPs more efficiently, by selecting appropriate framing, infill, and sheathing material.     

蒸压纤维水泥板覆面轻钢龙骨式复合墙体抗剪性能试验研究

为研究采用蒸压无石棉纤维素纤维水泥板(CCA板)覆面的轻钢龙骨式复合墙体的抗剪性能,进行了13片足尺墙体的水平单调加载和低周反复加载试验。试验结果表明,采用CCA板覆面轻钢龙骨式复合墙体的破坏主要表现为自攻螺钉连接处的CCA板拉裂或者螺钉拔出,最终CCA板失去传递剪力的能力而破坏,轻钢龙骨未发生明显破坏。基于试验结果,得到了各类CCA板覆面墙体的屈服荷载、最大荷载、破坏荷载以及位移延性系数等性能指标。最后,分析了CCA板厚度、密度以及加载方式对轻钢龙骨式复合墙体受剪性能的影响,并与OSB板、石膏板覆面墙体进行了比较。     

A numerical study on seismic performance of strap-braced cold-formed steel shear walls

This paper presents a non-linear finite element analyses in order to optimize the seismic characteristics of strap-braced cold formed steel shear walls enhanced with brackets in the four interior corners of the wall. The numerical models presented here are verified based on experimental tests considering different structural characteristics including: material nonlinearity, geometrical imperfection, residual stresses and perforations. A comparison between the numerical simulations and the test results shows a good agreement proves that the finite element analysis can be used effectively to predict the ultimate capacity of strap-braced CFS shear panels. A total of 16 models with different variants of bracket length are investigated. Of particular interests were the specimens' maximum lateral load capacity and deformation behavior in addition to a rational estimation of the seismic response modification factor. Preliminary conclusions presented in this paper, refer to the optimum seismic characteristics of strap-braced CFS shear walls and the corresponding dimensions and configuration.     

我国城镇住宅中应用轻钢龙骨结构体系的思考

总结了发达国家发展轻钢龙骨结构体系住宅的现状,分析了我国发展轻钢龙骨结构体系住宅的意义,给出了我国发展轻钢龙骨结构体系住宅的特点以及存在的问题,从而促进轻钢龙骨结构在我国城镇住宅建设中的应用.     

钢框架的抗火性能数值模拟

采用有限元分析软件对不同保护层厚度的平面钢框架结构在火灾下的反应进行数值模拟,通过对钢框架的非线性分析,将整体结构反应进行对比,以期为工程应用提供指导。     

Experimental investigation for seismic performance of framed structures having longitudinally profiled plates

This paper presents an application of hot-rolled-thickness tapered steel plates, longitudinally profiled (LP) plates, for improving seismic resistance performance of portal-framed bridge pier bents. The scale of the model was 2.0 m beam length, 2.0 m column height using centerline framing dimensions and the rectangular stiffened cross section of LP plate for flange and constant thickness plate for web. One portal model which has different tapering ratios at both the end panels of the column flanges was tested, and another model with the constant cross section of 330×250×6 mm was also tested for comparison.

The main conclusion of this study is that the optimum tapering ratio of the LP plates can lead to larger spread of yield zones with less strain concentration compared to the uniform thickness plate. Seismic design guidelines are also proposed for portal frames having LP plates.