共查询到19条相似文献,搜索用时 140 毫秒
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从调查中原地区城镇住宅楼面活荷载出发,阐述了建立持久性及临时性活荷载概率模型的过程。根据统计得到的房间单位面积的重量,按不同使用功能将房间分类,绘制各类房间荷载分布折线图,根据折线图形状呈左偏态的特点,假设统计荷载服从极值Ⅰ型分布,采用χ2检验法对假设的分布进行检验。结果表明,各种情况下均没有理由拒绝统计荷载服从极值Ⅰ型分布。给出了代表中原地区城镇住宅楼面持久性活荷载和临时性活荷载最大值的概率分布函数和统计参数,对编制荷载新规范具有参考价值。 相似文献
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中原地区住宅建筑结构活荷载调查与统计分析 总被引:1,自引:0,他引:1
从调查中原地区城镇住宅楼面活荷载出发,建立了持久性及临时性活荷载概率模型。经检验,统计荷载均服从极值I型分布。从调查统计所得的活荷载统计参数出发,根据Turkstra荷载组合原则,得出中原地区城镇住宅建筑结构在设计基准使用期内活荷载组合最大值的统计参数。针对不同使用功能的房间,分别按照79.1%分位值和97.4%分位值计算出代表各类型房间的楼面活荷载标准值,并与荷载规范中住宅楼面活荷载标准值的单一取值相比。计算结果表明,与原规范值(GBJ9-87)相比,不同使用功能房间的活荷载标准值是不同的,有高有低,且活荷载标准值应有所提高,这也是与新规范值(GB50009-2001)相一致的。结果反映了中原地区城镇住宅不同使用功能房间活荷载标准值的变化,可为荷载规范的进一步修订提供参考。 相似文献
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荷载的统计调查是井塔结构可靠性研究分析的重要基础。对内蒙和安徽地区采用直径大于4.0 m的提升机的井塔及提升机设计单位进行了荷载的系统调查,通过利用板面等效均布荷载换算法将其等效为楼面均布荷载;通过采用数理统计的方法,对井塔楼面检修区活荷载的概率分布和统计参数进行了研究分析,给出了当井塔设计基准期50年和100年时,结构楼面活荷载标准值的建议取值。 相似文献
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回顾总结了中国荷载规范中活荷载、风荷载及雪荷载的形成和演变过程,比较研究了中国(GB 50009—2012)、美国(ASCE 7)和欧洲(EN 1991-1-1)荷载规范的取值标准,表明我国荷载规范的取值水准与国外先进国家标准基本相当,我国荷载规范中人员可能聚集的公共建筑活荷载取值偏低,且缺少对楼面集中力活荷载校核的规定。建议部分公共建筑类楼面活荷载增加0.5k N/m2,补充部分楼面集中力活荷载,将风荷载及雪荷载的平均重现期由50年提高到100年,以提升我国的荷载水准,并与国际标准接轨。 相似文献
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建筑结构荷载规范中关于楼面等效荷载的计算方法有明确的说明,特别对民用建筑楼面活荷载、工业建筑楼面活荷载的取值都有详尽的规定.但是楼面等效均布活荷载的确定方法,随单向板、双向板、次梁、主梁等都会不相同.结合相关工程介绍了对楼面等效均布活荷载问题的梳理方法,并提出了公交停车库和车辆维修车间的楼面荷载取值的方法. 相似文献
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根据极值I型概率分布的性质,本文以楼面活荷标准值在设计基准期内的超越概率为基准,计算了不同设计使用年限楼面活荷载分布上具有相同的超载概率的荷载值,讨论了其与结构重要性系数的关系。 相似文献
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Kwesi A. Andam 《Building and Environment》1986,21(3-4):211-219
Imposed loads have been measured for 1353 rooms covering 27,818 m2 floor space in office buildings in Accra, the capital of Ghana. The data were collected in such a manner as to facilitate computer analysis. Eight room types were identified and the effect that imposed gravity loads had on each room type has been investigated. Analyses have been made to determine the variation of building height, occupancy duration and floor area with live loads. The live loads derived from the survey have been compared with similar surveys in the U.K. and U.S.A. Finally, a design load comprising a sustained load process and an extraordinary load event has been evaluated at an acceptable risk level and compared with existing design practice. 相似文献
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楼面活荷载、风荷载的频遇值和准永久值的确定 总被引:1,自引:1,他引:0
现行GB50009-2001《建筑结构荷载规范》规定的频遇值系数和准永久值系数是根据工程经验确定的,没有严格的统计基础。针对此种情况,按照GB 50009—2001的统计定义,建立频遇值系数和准永久值系数与平均超越时间和设计基准期比值的关系,得到楼面活荷载和风荷载的频遇值系数和准永久值系数。按统计方法得出的楼面活荷载频遇值系数比GB 50009—2001规定的值稍大,其准永久值系数比GB 50009—2001规定的值小,风荷载频遇值系数则稍大于规定。 相似文献
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Stuart G. Reid 《Structural Safety》1997,19(1):37-52
Probability-based patterned live loads for design are discussed with regard to probabilistic models of load-effects due to sustained live loads on floors. Statistics are presented for equivalent uniformly distributed loads (EUDLs) and equivalent patterned loads (EPLs) for a continuous beam and for continuous floor slab systems. It is shown that EPLs (rather than EUDLs) are required to realistically model structural load-effects that are sensitive to random load patterns. Furthermore, it is shown that an appropriate set of EPLs (for load-effects that are compounded by loading in the vicinity of the load-effect) can be approximated using a standardised EUDL (dependent on the area over which it acts) on the critical structural bay(s) in the vicinity of the load-effect, together with a constant (mean) uniformly distributed load acting on the other structural bays. Accordingly, ‘chequerboard’ design loads are not required. Indeed, it is shown that chequerboard EPLs are not appropriate for design, because their statistics are sensitive to the structural type and they are significantly different from the statistics of the standard EUDLs that are the basis of the standard design loads specified in design codes. 相似文献
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Live load model for highway bridges 总被引:4,自引:0,他引:4
Andrzej S. Nowak 《Structural Safety》1993,13(1-2)
Load models are developed for highway bridges. The models are based on the available statistical data on dead load, truck loads and dynamic loads. The paper deals mostly with the static live load. The model is derived from truck surveys, weight-in-motion measurements and other observations. Simple span moments, shears and negative moments are calculated for various spans. Extreme 75 year loads are determined by extrapolation. The important parameters also include girder distribution factors and multiple presence (more than one truck on the bridge). Multiple presence is considered in lane and side-by-side with various degrees of correlation between truck weights. The maximum load is calculated by simulations. The developed live model served as a basis for the development of new design provisions in the United States (LRFD AASHTO) and Canada (Ontario Highway Bridge Design Code). 相似文献
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用区间有限元方法求解活荷载不利分布问题,在INTLAB[1]基础上完成了求解活荷载不利分布的区间有限元MATLAB程序,算例初步验证了该方法的可行性与准确性.研究了平面框架在不同层数、跨数及活荷载大小的情况下,活荷载的不利分布对梁弯矩的影响程度.算例表明:活荷载大小和框架层数是决定是否考虑活荷载不利分布的重要因素,特别对于高层建筑结构,随着层数增加活荷我的不利分布对梁端弯矩的影响程度显著增大,工程设计中应给予考虑. 相似文献
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BS5400规范中的荷载及荷载组合 总被引:3,自引:0,他引:3
结合对英国规范BS5400中有关荷载规定的理解,就对国内桥梁设计具有重大参考价值的内容,从恒载、二期恒载、活荷载、荷载组合等方面进行了介绍,对于大跨度桥梁横向的动力分析有很好的帮助。 相似文献