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<正> 在地震区计算夯坑基础的承载力时,要遵照《建筑结构荷载规范》、《建筑地基基础设计规范》及《建筑抗震设计规范》考虑计算荷载的特殊组合。荷载的特殊组合由永久荷载(恒荷载),可变荷载(活荷载)及一种偶然荷载(特殊荷载)构成,在地震区,偶然荷载就是地震荷载。在考虑地震荷载后,就不再考虑其他类型的偶然荷载(如:工艺设备突然破坏造成的爆炸力或冲击力等)。地基土的强度特性φ、c等的计算值要采用土在完全饱和状态下的数值。夯坑基础地基承载力计算的目的是保证其稳定性,不允许在基础底面产生剪切或造成基础倾覆。地基承载力根据下列条件计算: 相似文献
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对《门式刚架轻型房屋钢结构技术规程》(CECS102:2002)和《建筑结构荷载规范》(GB50009—2012)中的风荷载设计进行分析、比较,并提出了门式刚架设计中需要注意的一些问题,供设计人员参考。 相似文献
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根据《建筑结构荷载规范》(GB 50009-2001)和《美国低层房屋建筑系统手册》(MBMA 86),提出当屋面坡度不大于2.5°的门式刚架结构,可不考虑雪荷载的不均匀分布;当屋面坡度大于2.5°时,则必须考虑雪荷载的不均匀分布. 相似文献
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针对我国现行设计规范中各类结构构件可靠指标校核中发现的问题,对荷载分项系数及部分可变荷载标准值的取值进行优化.从构件可靠指标的最小值与平均值、构件可靠指标的离散性、荷载分项可靠指标的一致性、设计值点与理想值的偏离程度四个维度对近三代设计标准[《建筑结构荷载规范》(GBJ 9-87)、《建筑结构可靠度设计统一标准》(GB... 相似文献
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《特种结构》2016,(3)
基于对比分析中国船级社规范《海上风力发电机组认证规范》、日本规范《风电塔支撑结构设计指南·同解说》(2010年版)、国际电工委员会的《海上风力发电机组设计标准》(IEC/TC88 61400-3)、挪威船级社规范"Design on offshore wind turbine structures"(DNV-OS-J101),研究风电机塔架在风荷载、地震荷载、波浪荷载作用下的设计要求。并选用轮毂高度为88.5m的风电塔为算例,由于海洋环境中风荷载、波浪荷载起主导作用,因此对比分析四种典型规范下风电塔在年平均风速和极端风速及其相应波浪荷载作用下的剪力及弯矩,为风电塔结构风荷载、地震荷载、波浪荷载作用下的设计提供指导。 相似文献
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《四川建筑》2021,41(2)
PKPM旧版程序(V3.1.6版以前)中对于楼面梁活荷折减只能实现GB 50009-2012《建筑结构荷载规范》[1](以下简称《荷载规范》)第5.1.2-1条的第(1)、(2)项,即根据从属面积实现相应的折减,同时该参数作用于全楼模型,并不能按照《荷载规范》区分不同的活荷载类型。而对于柱、墙、基础构件的活荷载折减则按照表5.1.2的规定执行,但是《荷载规范》同时明确规定该条文仅适用于表5.1.1中的第1(1)项的活荷载。综上,PKPM程序对于活荷载的折减考虑不够全面,使得工程师只能通过在特殊构件定义中单独修改构件的活荷载折减系数的方式实现活荷载折减的精细化处,增加了很多工作量。PKPM V3.1.6及后续版本增加自动按照房间活荷类别,实现活荷载折减精细化处理的功能。 相似文献
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建筑结构基本风压统计方法的改进 总被引:2,自引:0,他引:2
改进了《建筑结构荷载规范》(GB5 0 0 0 9- 2 0 0 1)规定的基本风压的统计方法 ,通过MonteCarlo方法模拟分析 ,说明该方法有更高的精确度 ;由该方法确定的基本风压值比按规范 (GB5 0 0 0 9- 2 0 0 1)确定的值要小 ,通过实例分析说明该方法有实用的价值 ;可供规范改编时参考 相似文献
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多层住宅新型复合结构体系的结构选型分析 总被引:10,自引:0,他引:10
对由截面较小的梁、柱、支撑形成的复合结构代替住宅中承重墙的新型住宅结构体系进行了结构选型分析。选取常见的三种支撑形式 ,用不同软件分别对其进行了竖向荷载和水平风荷载作用下的内力计算分析。其结果表明 ,竖向荷载作用下 ,“人字”支撑的结构体系内力最小 ,构件弯矩、剪力仅为另两种形式的 2 0 %~ 6 0 % ;水平荷载作用下 ,三种支撑结构的内力相差较小 ,说明三种支撑结构体系在抗侧能力方面基本相等 ,但和框架结构内力相比 ,梁的弯矩仅为框架梁的 1 5 0 ,柱弯矩仅为 1 2 5。由此得出“人字”支撑结构为新型复合结构体系较合理的结构形式。 相似文献
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A model structure resembling a flat plate (or a tall prestige building) was tested in a low-turbulence wind tunnel. With flow normal to the façade the model oscillated vigorously in the flow direction when passing through a “critical” velocity range. A sufficient minimum of experimental circumstances are reported to facilitate future search for this “Big Foot” phenomenon that should interest all those who assume that the dynamic drag forces of bluff structures are soley due to the turbulent wind field. 相似文献
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In July 1978 the Dutch coast was polluted by oil over a distance of more than 100 km. Gas chromatographic studies of samples of oil from the beaches showed that this oil was very similar to that released from the oil Tanker “Eline V”, which collided with the “Rosaline” off the coast of East Anglia, England on 6 May 1978. An examination of wind strength, wind direction and sea currents, which determine oil movements on the sea, suggests that the oil pollution on the Dutch beaches originated from the bow section of the ship, which was blown up on 30 May 1978. 相似文献
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In this paper, a technique is discussed which enables extreme wind speed probabilities in mixed wind climates to be determined. It is shown that in such wind climates the method is likely to yield more accurate probability estimates than the traditional Gumbel analysis of annual wind speed maxima, particularly for annual probabilities of less than 2% (i.e. return periods greater than 50 years). The technique requires a separate analysis of each significant wind-producing meteorological phenomenon and practical methods of achieving this are presented. Extreme wind speed parameters obtained from each analysis may then be combined to yield a “composite extreme wind speed diagram” and several examples illustrating this procedure are shown. By means of a numerical simulation of a typical mixed wind climate, a detailed study is made of the distribution of extreme wind gusts from different meteorological phenomena. This study indicates that a Gumbel analysis of 20 annual maxima may severely underestimate low annual probability (i.e. long return period) gust speeds. 相似文献
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Andrzej M. Wrzesien Duoc T. Phan James B. P. Lim Hieng-Ho Lau Iman Hajirasouliha Cher Siang Tan 《钢结构国际杂志》2016,16(2):299-307
Cold-formed steel (CFS) portal frames can be a viable alternative to conventional hot-rolled steel portal frames. They are commonly used for low-rise commercial, light industrial and agricultural buildings. In this paper, the effect of stressed-skin action on the optimum design of CFS portal frames is investigated by conducting a minimum cost design optimisation on a building of span of 6 m, height-to-eaves of 3 m and frame spacing of 3 m; the effect of different number of bays are considered. For the purpose of this study, it is assumed that gables are rigid.The effect of stressed-skin action is larger for“square-shaped” buildings (i.e. when the span and length are the same on plan) and decreases as more bays are added(i.e. as the building becomes more “rectangular-shaped” on plan). The results of the minimum cost optimisation indicate that if stressed-skin action is taken into account, the cost of the internal frame can be reduced by around half for “square-shaped” buildings. It should be noted that this is a minimum cost optimisation, which is not the same as a minimum weight optimisation. It is also shown that a safe design of internal frames could be obtained by ignoring wind loads (i.e. designing the frame only for gravity loads),but this is limited to buildings having a “square-shape”. 相似文献