单向板肋梁楼盖设计例题.doc
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1、单向板肋梁楼盖设计例题【例题1.1】设计图123所示的单向板肋梁楼盖,板和次梁按调幅法设计,主梁按弹性理论设计。楼面活荷载标准值为45kNm2,混凝土强度等级为C20。【解】一、板的设计(一)板的计算跨度及荷载(图124)拟定板厚80mm,次梁高h=(112-118)l=(112-118)5500=460305,取h=450mm,次梁宽b=(1213)h=(1213)450=225150,取b=200mm。图2.23单向板肋梁楼盖例题的施工图因板两端与梁固接,按调幅法计算故板的计算跨度取净跨边跨中间跨活荷载设计恒荷载标准值:20mm厚砂浆抹面,80mm厚现浇板天棚粉刷,恒荷载设计值:,(二)计
2、算截面的弯矩设计值及配筋取板的计算宽度为1lm,按端支座是固定的五跨等跨连续板计算。中间区格板带中的中间区格板和的四个周边都是与梁连接的,考虑拱作用,将弯矩设计值降低20,边区格板以及中间区格板带中的边区格板 的弯矩则不降低。采用HPB235级钢筋,采用分离式配筋,弯矩及配筋计算见表1.8,配筋见图1.22。为减少板面负钢筋(包括构造的)在施工中被踩下,故都采用。表18连续单向板按调幅法设计的截面弯矩及配筋计算表边区格板带B1、B2、B3中间区格板带B4、B5、B6截 面端支座边跨跨中第一内支座中间跨中中间支座端支座边跨跨中第一内支座中间跨中中间支座计算跨度(m)1.851.852.02.02
3、.01.851.852.02.02.0弯矩系数amb-116114-111116-1l4-1241/14111116-114弯矩(kNm)-1.912.19-3.252.24-2.56-1.282.19-2.61.79-2.05As(mm2)156179270195210103179214157167配筋8250615081808140822082506150822061808250钢筋有效面积(mm2)201189279202229201189229157201注:为了减少施工中板面负钢筋被踩下,故采用08且配筋量适当放宽。二、次梁的设计(L3.1)(一)次梁的计算跨度及荷载(图125)图1
4、.25计算简图1.计算跨度主梁高h一(18114)z一(18114)6600830470mm,取主梁截面650mm250mm。因次梁两端与主梁或柱连接,按调幅法计算,故次梁的计算跨度取净跨度:边跨中间跨2.荷载恒荷载活荷载(二)次梁正截面受弯承载力计算因跨度相差小于10,故次梁按端支座是固定的五跨等截面等跨连续梁计算(表19)。承受正弯矩的跨中截面按的T形截面计算。表19次梁正截面受弯承载力计算及配筋计算(三)次梁斜截面受剪承载力及箍筋计算由表l4可查得值。端支座剪力设计值:第一内支座左侧截面剪力设计值:第一内支座右侧截面及中间支座的两侧截面的剪力设计值:核算截面尺寸:(符合要求)设只配双肢箍
5、筋,不配弯起钢筋设箍筋间距s=200mm,则箍筋单肢所需截面面积:拟采用。三、主梁的设计(KL3.1)(一)主梁的计算跨度及荷载(图126)图1.26计算简图按弹性理论计算,故计算跨度取柱轴线间的距离,即边跨,中间跨。活荷载恒荷载(二)主梁的内力计算按端支座是固定的三跨等截面连续梁计算,故采用实用弯矩分配法计算。(1)固端弯矩恒总(2)支座A、B的最大负弯矩及相应的支座的负弯矩计算(注:计算是为了求支座最大剪力),见图127所示。以上求得的是B支座的支座中心处的弯矩值,由式(110)知B支座边缘截面弯矩设计值为图1.27主梁支座最大负弯矩MA、MB及相应值的计算(3)支座最大剪力支座A右截面最
6、大剪力支座B左截面最大剪力支座B右截面最大剪力(4)主梁跨中最大正弯矩先用实用弯矩分配法算出与边跨跨中最大正弯矩相对应的支座负弯矩值,如图l23所示。图1.28与边距跨中最大正弯矩相对应的支座负弯矩的计算1)边跨跨中最大正弯矩边跨跨中最大正弯矩发生在B支座左侧第一个集中荷载处,其值为2)中间跨跨中最大正弯矩先用实用弯矩分配法算出与中间跨跨中截面最大正弯矩相对应的8支座负弯矩值,见图129。故中间跨跨中最大正弯矩:(三)主梁的正截面受弯承载力计算及配筋(见表110)图1.29与中间跨跨中最大正弯矩相对应的B支座负弯矩值的计算表110主梁正截面受弯承载力计算及配筋计算(四)主梁斜截面受剪承载力计算
7、及配置箍筋(1)截面验算(2)不设弯起钢筋,只配箍筋,并用,现验算如下:(五)主梁附加箍筋的计算在支承次梁处只设附加箍筋,不再设置吊筋。在传递的集中力设计值中不应包括主梁自重,即用双肢箍,以n=2,由式(122)得采用在次梁每一侧边各加密3道箍筋间距50mm。四、施工图如图123所示,为了节省篇幅,图上既表达了结构平面布置和板的配筋,也用平面表示法表达了主梁和次梁的配筋,以及附加箍筋。其中主、次梁相交处A表示在主梁上于次梁截面两侧各配置加密箍筋3道。(英文版 ) Two regulations promulgated for implementation is in the party in
8、power for a long time and the rule of law conditions, the implementation of comprehensive strictly strategic plan, implementation in accordance with the rules and discipline to manage the party, strengthen inner-party supervision of major initiatives. The two regulations supporting each other, the a
9、dhere to a positive advocate, focusing on morality is of Party members and Party leading cadres can see, enough to get a high standard; around the party discipline, disciplinary ruler requirements, listed as negative list, focusing on vertical gauge, draw the party organizations and Party members do
10、 not touch the bottom line . Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulations the necessity and the revision process; the second part is the interpretation of the two fundamental principles of the revision of laws and reg
11、ulations in the party; the third part introduces two party regulations modified the main changes and needs to grasp several key problems; the fourth part on how to grasp the implementation of the two regulations of the party. and revised the necessity and revised history of the CPC Central Committee
12、 the amendment to the Chinese Communist Party members and leading cadres honest politics several guidelines and column 1 by 2015 to strengthen party laws and regulations focus. Two party regulations revision work lasted a Years, pooling the wisdom of the whole party, ideological consensus, draw hist
13、orical experience, respect for the wisdom of our predecessors, which reflects the unity of inheritance and innovation; follow the correct direction, grasp the limited goals, adhere to the partys leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the and
14、 , reflects the partys 18 and the eighth session of the third, the spirit of the fourth plenary session, reflecting the experience of studying and implementing the General Secretary Xi Jinping series of important speech, reflects the partys eighteen years comprehensive strictly practice. (a) revised
15、 two regulations of the party need of in based on revised, the promulgation and implementation of January 2010, to strengthen the construction of the contingent of leading cadres play an important role. But with the party to manage the party strictly administering the deepening, has not been able to
16、 fully meet the actual needs. Content is too complicated, eight prohibition, 52 are not allowed to hard to remember, and also difficult to put into practice; the second is concisely positive advocated by the lack of prohibited provisions excessive, no autonomy requirements; the third is banned terms
17、 and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat; the fourth is to clean the theme is not prominent, not for the existing problems, and is narrow, only needle of county-level leading cadres above. is in 1997 b
18、ased on revision, in December 2003 the promulgation and implementation, to strengthen the construction of the party play very important role. Along with the development of the situation, which many provisions have been unable to fully meet the comprehensive strictly administering the practice needs.
19、 One is Ji law, more than half of the provisions and criminal law and other countries laws and regulations Repetition; two is the political discipline regulations is not prominent, not specific, for violation of the party constitution, damage the authority of Party Constitution of misconduct lack ne
20、cessary and serious responsibility to pursue; third is the main discipline for the leading cadres, does not cover all Party members. Based on the above situation, need to and the two is likely to be more relevant regulations first amendment. By revising, really put the authority of Party discipline,
21、 the seriousness in the party tree and call up the majority of Party members and cadres of the party constitution of party compasses party consciousness. (II) two party regulations revision process the Central Committee of the Communist Party of China attaches great importance to two regulations rev
22、ision . Xi Jinping, general books recorded in the Fifth Plenary Session of the eighth session of the Central Commission for Discipline Inspection, on the revised regulations made clear instructions. According to the central deployment, the Central Commission for Discipline Inspection from 2014 under
23、 six months begin study two regulations revision. The Standing Committee of the Central Commission for Discipline Inspection 4 review revised. Comrade Wang Qishan 14 times held a special meeting to study two regulations revision, amendment clarifies the direction, major issues of principle, path and
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