首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
多层住宅新型复合结构的Pushover分析及支撑优化   总被引:3,自引:0,他引:3       下载免费PDF全文
通过对柔性梁柱加“人字”支撑的新型住宅复合结构的静力弹塑性(Pushovei)分析,进行了抗震性能评 估,并优化了结构构件截面.采用250mm×250mm的梁柱截面、120mm×120mm的支撑截面及正常配筋所 形成的复合结构,满足按9度抗震设防(多遇地震)的抗震能力和延性要求以及8度罕遇地震的抗倒塌验算. 其耗能机制为“混合机制”,塑性铰出现的位置及顺序为:支撑、梁端、柱下端、柱上端,因此满足“强柱、中 梁、弱支撑”多道抗震防线的抗震要求.在柱截面不改变的情况下,薄弱层出现在底层,最大层间位移满足 罕遇地震作用下结构薄弱层弹塑性层间位移的要求.计算分析得出合理的支撑与柱的抗侧刚度比在4-10 之间;最后优化了支撑截面.  相似文献   

2.
目前国内住宅结构体系普遍存在着一些缺点,通过对这些不足之处的分析,指出由钢筋混凝土柔性柱(截面尺寸为250mm×300mm)、柔性梁(截面尺寸为250mm×250mm)和钢筋混凝土支撑(截面尺寸小于梁柱)组成的带“人”字支撑的新型复合结构具有一定的优越性,可代替原住宅结构中的承重墙及不开门洞的自承重墙的复合结构体系。本文从空间体系研究着手,提出了延性结构体系,不仅能满足变化多样的住宅建筑空间模式,而且能满足结构抗震延性要求,从而代替砌体结构的黏土砖墙。  相似文献   

3.
针对用于代替粘土砖住宅结构的钢筋混凝土柔性梁柱加"人字"支撑形成的复合结构,采用1∶2的试验缩尺模型,根据抗震试验规程和理论计算的开裂荷载、屈服荷载及7,8和9度地震作用,设计出加载方案,进行了拟静力-低周反复荷载试验,研究该复合结构模拟地震作用下的刚度和裂缝.试验结果表明,该复合结构在水平低周反复荷载作用下,首先在2个支撑上出现多条较均匀的裂缝;然后梁截面和柱顶、底截面混凝土相继开裂.在水平力相当于9度多遇地震作用时,其裂缝最大宽度小于0.3mm、最大层间位移小于弹性层间位移限值,即复合结构满足正常使用极限状态的要求.引入了综合循环刚度的概念,绘出了刚度退化曲线,探讨了复合结构刚度及强度的退化规律.  相似文献   

4.
非强柱弱梁钢筋混凝土框架试验及有限元分析   总被引:1,自引:0,他引:1  
通过两榀单层单跨混凝土框架在竖向荷载下的试验研究和非线性有限元全过程分析,对"梁强于柱"和"梁柱等强"框架的极限荷载、正常使用状态下的变形、位移延性和塑性内力重分布进行了研究.研究结果证明,在配筋适当的情况下,"梁强于柱"和"梁柱等强"框架在正常使用荷载下裂缝宽度和挠度均能满足混凝土结构设计规范的要求,且均具有较好的延性,能实现充分内力重分布.  相似文献   

5.
通过2榀预应力混凝土叠合框架1:3比例的模型试验,了解了叠合梁框架在竖向荷载作用下的受力性能。讨论了叠合梁截面应变分布特点,并分析了梁的配筋率这一主要参数对框架极限承载力和破坏形态的影响。  相似文献   

6.
1 工程概况甘肃省地税局高层综合楼建筑面积32853m2 总高97.10m 地下2 层1 4 层为框架――剪力墙 5 层以上为剪力墙体系4 5 层间设现浇钢混凝土大梁结构转换层转换层竖向标高位置18.50 21.40m 由转换大梁同时与上下楼板相连组成上层楼板200mm 厚,下层楼板250mm 厚大梁断面700 2900mm 如图1 混凝土强度等级为C 40 下部承梁柱截面为1100 1100 柱网尺寸7800 7400 7800 5100 7800 4700 几种2 工程特点2.1 转换大梁截面尺寸700 2900mm 单位长度自重51KN/m 断面高体量大且册时与上下楼层结构连为一体2.2 梁配筋密主筋为44 25 箍筋为14@100 腰筋2…  相似文献   

7.
为提高混凝土结构的刚度和耐久性,提出一种新型混杂配筋形式,钢-连续纤维复合筋(steel fiber composite bar, SFCB)和玄武岩纤维复合筋(basalt fiber reinforced polymer, BFRP)混合增强混凝土结构.将其与钢筋混凝土梁、传统混杂配筋梁的受弯性能进行对比研究,同时考察等效配筋率ρ_e、FRP与钢截面面积比A_f/A_s等参数对混杂配筋梁受弯性能的影响.结果表明:几种结构梁的破坏形态均为钢筋屈服后受压区混凝土压溃;与钢筋混凝土梁相比,混杂配筋梁具有较高的极限承载力,在受弯破坏前具有良好的耗能能力;混杂配筋梁的受弯承载力随着ρ_e值增加而增大,且ρ_e值越大,跨中挠度越小,裂缝宽度越小;A_f/A_s值对混杂配筋梁屈服后刚度影响较大,A_f/A_s值越高,钢筋屈服后结构刚度降低幅度越小.  相似文献   

8.
为了研究新型斜柱转换结构的抗震性能影响,对五榀不同肢厚比的新型斜柱转换结构进行竖向荷载和水平低周期反复荷载共同作用下的受力性能分析,分析试件的破坏形态、滞回曲线、骨架曲线、承载能力、位移延性及刚度退化。研究结果表明:当肢厚比控制在8.5~9.5之间,能取得良好的耗能性能,下部框架梁主要受拉,建议设计时加强配筋并通长布置。  相似文献   

9.
本文主要讲述了的某民建项目雨篷设计。本方案主体结构为横向承重框架,横向框架等跨。在进行荷载计算和构件截面估算后,选取了一榀框架进行计算,计算内容包括框架梁柱截面尺寸的选取及线刚度的计算;恒载、活载、地震作用下梁端、柱端弯矩、剪力的计算;框架内力组合;框架梁柱配筋计算;楼梯配筋计算及基础配筋计算。  相似文献   

10.
“柱强于梁”、“梁强于柱”和“梁柱等强”的3种情况在单层预应力框架或多层预应力框架的顶层中是可能出现的.通过4榀预应力混凝土框架在竖向荷载下的试验,对三类预应力混凝土框架的极限荷载、正常使用下的变形、位移延性、塑性内力重分布进行了研究.试验分析结果证明,当截面相对受压区高度较小时,这三类预应力框架均能实现完全的塑性内力重分布,具有较好的位移延性,在正常使用荷载下裂缝宽度和挠度均能满足混凝土结构设计规范的要求.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

17.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

18.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

19.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

20.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号