n钢筋锚固长度计算方法.doc

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1、Xiaoping theory and the important thought of the three represents and the scientific Outlook on development. Such changes were made, is conducive to implementing the innovation of Marxism in China, especially the scientific concept of development the strategic task of arming the whole party, play gr

2、ass-roots organizations in promoting the scientific Outlook on development into the grass-roots level, and to implement the important role. Third, how to use the contents of the new Constitution guiding party building through studying the essence of the new Constitution, the flexible application of

3、the essence of the Constitution in party building, and I think the key to grasping the following: to catch the discipline, focus on strengthening the partys rules and regulations binding. To strictly observe and carry out the partys political discipline, ensure the centralism and unity of the whole

4、party. Party cadres, especially leading cadres, both doers, but also have a strong sense of political awareness to dry line, line, not lack of ability to work, become a talker; hard work isSkill, political direction, unable to understand when confused. Flag of the CPC Central Committee and the Commi

5、ttees requirements into Departments request, to a holistic and concerted efforts, subject to the overall situation. Second, cadres and strive to play an exemplary role of party members and cadres of hardworking and clean, emphasizes lead, shift, led. Lead is to adhere to set an example, to lead by e

6、xample, deal with the relationship between individuals and parties, real lead role shift is in order to strengthen the sense of responsibility, creating a fighting force; lead is to adhere to strict requirements, strict management and strict supervision. Three catch basis and strive to enhance the c

7、ombat effectiveness of the party organization. To according to Constitution on grass-roots party of requirements, to implementation good basic system, for members for, regardless of party positions has more high, administrative terms has more big, any when are to has Organization concept, active par

8、ticipate in organization activities, consciously accept party of supervision; to do based sex work, management good members, service good members, grass-roots party to using members organization received turned, and members thought reported, and party of Conference and dues pay, opportunities, maste

9、r members of basic situation, care members life. Four to focus and work hard to resolve. Comrades, the above is what I give you guidance in the new Constitution. Hope every Member of the party to pass the tutor, deepen our understanding of the Constitution in the partys guiding ideology advancing wi

10、th the times, consciously link their own thinking and practice, after careful study, read and carefully understand, think, relate, apply what they have learned. Not only runs through the mass line of the party Constitution to learn the new educational practice all the time, but also to harvest as a

11、good starting point to learn, study and work to do better in the future, and strive to create a new situation for school education contribute their钢筋锚固长度计算方法 钢筋锚固长度计算方法一)钢筋工程量计算规则1、钢筋工程,应区别现浇、预制构件、不同钢种和规格,分别按设计长度乘以单位重量,以吨计算。2、计算钢筋工程量时,设计已规定钢筋塔接长度的,按规定塔接长度计算;设计未规定塔接长度的,已包括在钢筋的损耗率之内,不另计算塔接长度。钢筋电渣压力焊接、

12、套筒挤压等接头,以个计算。3、先张法预应力钢筋,按构件外形尺寸计算长度,后张法预应力钢筋按设计图规定的预应力钢筋预留孔道长度,并区别不同的锚具类型,分别按下列规定计算:(1)低合金钢筋两端采用螺杆锚具时,预应力的钢筋按预留孔道长度减0.35m,螺杆另行计算。(2)低合金钢筋一端采用徽头插片,另一端螺杆锚具时,预应力钢筋长度按预留孔道长度计算,螺杆另行计算。(3)低合金钢筋一端采用徽头插片,另一端采用帮条锚具时,预应力钢筋增加0.15m,两端采用帮条锚具时预应力钢筋共增加0.3m计算。(4)低合金钢筋采用后张硅自锚时,预应力钢筋长度增加0.35m计算。(5)低合金钢筋或钢绞线采用JM,XM,QM

13、型锚具孔道长度在20m以内时,预应力钢筋长度增加lm;孔道长度20m以上时预应力钢筋长度增加1.8m计算。(6)碳素钢丝采用锥形锚具,孔道长在20m以内时,预应力钢筋长度增加lm;孔道长在20m以上时,预应力钢筋长度增加18m.(7)碳素钢丝两端采用镦粗头时,预应力钢丝长度增加0.35m计算。(二)各类钢筋计算长度的确定钢筋长度=构件图示尺寸保护层总厚度+两端弯钩长度+(图纸注明的搭接长度、弯起钢筋斜长的增加值)式中保护层厚度、钢筋弯钩长度、钢筋搭接长度、弯起钢筋斜长的增加值以及各种类型钢筋设计长度的计算公式见以下:1、钢筋的砼保护层厚度受力钢筋的砼保护层厚度,应符合设计要求,当设计无具体要求

14、时,不应小于受力钢筋直径,并应符合下表的要求。钢筋的砼保护层厚度(mm)环境条件构件名称砼强度等级低于C25C25及C30高于C30室内正常环境板、墙、壳15梁、柱25露天或室内高湿度环境板、墙、壳352515梁、柱453525有垫层基础3570无垫层注:(1)轻骨料砼的钢筋的保护层厚度应符合国家现行标准轻骨料砼结构设计规程。(2)处于室内正常环境由工厂生产的预制构件,当砼强度等级不低于C20且施工质量有可靠保证时,其保护层厚度可按表中规定减少5mm,但预制构件中的预应力钢筋的保护层厚度不应小于15mm;处于露天或室内高湿度环境的预制构件,当表面另作水泥砂浆抹面且有质量可靠保证措施时其保护层厚

15、度可按表中室内正常环境中的构件的保护层厚度数值采用。(3)钢筋砼受弯构件,钢筋端头的保护层厚度一般为10mm;预制的肋形板,其主肋的保护层厚度可按梁考虑。(4)板、墙、壳中分布钢筋的保护层厚度不应小于10mm;梁、柱中的箍筋和构造钢筋的保护层厚度不应小于15mm。2、钢筋的弯钩长度级钢筋末端需要做1800、1350、900、弯钩时,其圆弧弯曲直径D不应小于钢筋直径d的2.5倍,平直部分长度不宜小于钢筋直径d的3倍;HRRB335级、HRB400级钢筋的弯弧内径不应小于钢筋直径d的4倍,弯钩的平直部分长度应符合设计要求。如下图所示:1800的每个弯钩长度=6.25d;(d为钢筋直径mm)1350

16、的每个弯钩长度=4.9d;900的每个弯钩长度=3.5d;3、弯起钢筋的增加长度弯起钢筋的弯起角度一般有300、450、600三种,其弯起增加值是指钢筋斜长与水平投影长度之间的差值。4、箍筋的长度箍筋的末端应作弯钩,弯钩形式应符合设计要求。当设计无具体要求时,用级钢筋或低碳钢丝制作的箍筋,其弯钩的弯曲直径D不应大于受力钢筋直径,且不小于箍筋直径的2.5倍;弯钩的平直部分长度,一般结构的,不宜小于箍筋直径的5倍;有抗震要求的结构构件箍筋弯钩的平直部分长度不应小于箍筋直径的10倍。箍筋的长度两种计算方法:(1)可按构件断面外边周长减去8个砼保护层厚度再加2个弯钩长度计算。(2)可按构件断面外边周长

17、加上增减值计算。箍筋增减值调整表形状直径d(mm)备注(保护层按25mm考虑的)466.581012增减值抗震结构1350/1350-88-33-202278133增减值=258-27.8d一般结构900/1800-133-100-90-66-330增减值=258-16.75d一般结构900/900-140-110-103-80-50-20增减值=258-15d(三)钢筋的锚固长度钢筋的锚固长度,是指各种构件相互交接处彼此的钢筋应互相锚固的长度。如图所示设计图有明确规定的,钢筋的锚固长度按图计算;,当设计无具体要求时,则按混凝土结构设计规范的规定计算。GB500102002规范规定:(1)受拉

18、钢筋的锚固长度受拉钢筋的锚固长度应按下列公式计算:普通钢筋La=a(fy/ft)d预应力钢筋La=a(fpy/ft)d式中fyfpy普通钢筋、预应力钢筋的抗拉强度设计值;ft混凝土轴心抗拉强度设计值,当混凝土强度等级高于C40时,按C40取值;d钢筋直径;a钢筋的外形系数(光面钢筋a取0.16,带肋钢筋a取0.14)。普通钢筋抗拉强度设计值(N/mm2)种类符号fy热轧钢筋HPB235(Q235)210HRB335(20MnSi)300HRB400(20MnSiV、20MnSiNb、20MnTi)360RRB400(K20MnSi)360注:HPB235系指光圆钢筋,HRB335、HRB400

19、及RRB400级余热处理钢筋系指带肋钢筋。混凝土强度设计值(N/mm2)强度种类混凝土强度等级C15C20C25C30C35C40C45C50C55C60C65C70ft0.911.101.271.431.571.711.801.891.962.042.092.14注:当符合下列条件时,计算的锚固长度应进行修正:1、当HRB335、HRB400及RRB400级钢筋的直径大于25mm时,其锚固长度应乘以修正系数1.1;2、当HRB335、HRB400及RRB400级的环氧树脂涂层钢筋,其锚固长度应乘以修正系数1.25;3、当HRB335、HRB400及RRB400级钢筋在锚固区的混凝土保护层厚度

20、大于钢筋直径的3倍且配有箍筋时,其锚固长度可应乘以修正系数0.8;4、经上述修正后的锚固长度不应小于按公式计算锚固长度的0.7倍,且不应小于250mm;5、纵向受压钢筋的锚固长度不应小于受拉钢筋锚固长度的0.7倍。纵向受拉钢筋的抗震锚固长度LaE应按下列公式计算:一、二级抗震等级:LaE=1.15La三级抗震等级:LaE=1.05La四级抗震等级:LaE=La(2)圈梁、构造柱钢筋锚固长度圈梁、构造柱钢筋锚固长度应按建筑抗震结构详图GJBT465,97G329(三)(四)有关规定执行,如下图所示。图中La的有关规定竖向钢筋1214混凝土强度等级C15C20C15C20La60048070056

21、0(四)钢筋计算其他问题在计算钢筋用量时,还要注意设计图纸未画出以及未明确表示的钢筋,如楼板中双层钢筋的上部负弯矩钢筋的附加分布筋、满堂基础底板的双层钢筋在施工时支撑所用的马凳及钢筋砼墙施工时所用的拉筋等。这些都应按规范要求计算,并入其钢筋用量中。(五)砼构件钢筋、预埋铁件工程量计算1、现浇构件钢筋制安工程量:抽筋按理论重量计算。钢筋工程量=钢筋分规格长Kg/m件数。(0.00617d2=Kg/m,钢筋直径:dmm);2、预制钢筋砼凡是标准图集构件钢筋,可直接查表,其工程量=单件构件钢筋理论重量件数;而非标准图集构件钢筋计算方法同“1”。3、预埋铁件工程量预埋铁件工程量按图示尺寸以理论重量计算

22、。如图所示计算10根钢筋混凝土预制柱的预埋铁件工程量:解(1)计算-10钢板理论重量M-1:0.40.478.5/10=125.60M-2:0.30.478.5/10=92.40M-3:0.30.3578.5/10=82.40M-4:20.10.32278.5/10=100.50M-5:40.10.36278.5/10=226.10(2)计算12、18钢筋理论重量M-1:12钢筋:2(0.3+0.362+12.50.012)0.888/m10=20.80M-2:12钢筋:2(0.25+0.362+12.50.012)0.888/m10=19.90M-3:12钢筋:2(0.25+0.362+12

23、.50.012)0.888/m10=19.90M-4:18钢筋:230.382.00/m10=45.60M-5:18钢筋:430.382.00/m10=91.20小计:20.80+19.90+19.90+45.60+91.20=197.4合计:627+197.4=824.4预埋铁件工程量=0.824t4、钢筋工程量计算实例(1)钢筋混凝土现浇板如图所示计算10块板的钢筋工程量解:8=(2.7-0.0152)(2.4-0.0152)0.15+10.395=2.67130.395=13.71kg8=2.37190.395=17.79kg12=(0.5+0.12)(2.67+2.3)20.2+40.

24、888=33.56kg6.5=(2.676+2.376)0.26=7.86kg小计:10以内:(13.71+17.79+7.86)10=393.60kg10以上:33.5610=335.60kg铁马钢筋按经验公式1%计算:10以内:(393.60+335.60)0.01=7.29kgThank you very much. -The Constitution Party rules address the series really is a qualified party members earlier this year, all party members to the Central

25、series of party rules, and address of the party Constitution, be qualified party members learn education is an important decision. XI Jinping, Secretary General chaired a Politburo meeting in February, were devoted to educational programmes and made an important speech recently personally approved s

26、pecific programmes, many important instructions. On April 6, 13th, 15th, the Central and autonomous regional party Committee, the municipal party Committee held educational symposium, and related matters For specific deployment, we held on March 4, Hongshan district party working Conference also pro

27、posed to carry out this activity. All together this forum today, main purpose is to study and implement in depth General Secretary XI Jinping on two important instructions for learning education, studying and implementing the Central and autonomous region Party Committee and municipal party Committe

28、e two spiritual education Symposium, arrangements for district-wide learning education. The following, I would like to stress four points, mainly talk about learning and doing issue, and strive to make people really figure out why, what to learn and how they learn, what to do, how to do it, eventual

29、ly reached little success, is also leading a lesson in party lecture. After both leaders and the cadres, regardless of Branch Secretary or an ordinary party member, to implement certain boundaries education give a Party lecture requirement, practice speaking, speak much fanfare, innovation way, down

30、 to Earth, ensuring educational success. First, you know, pay special attention to education and to resolutely overcome sluggish thinking, and boredom two study and education, possibly quite a few comrades, saying education every year, almost every year fool fool, I feel that with this in mind who m

31、ay be many. If carrying this idea in mind, what does that tell, how the political consciousness is not strong and not see the pulse of the situation, no, the Rip van Winkle, lost or confused in the end do not know whats going on. To realize two a learning practice activities and education is the edu

32、cation of the partys mass line, three-three special education was another important practice in implementing the requirements of strictly administering the party. Comrade XI Jinping pointed out: the deployment of doing education, is to promote the inner-party education from critical few their expans

33、ion into the vast number of party members, extending from the concentrated education to regular education. After 18, Central Committee of the party must handle party, strictly administering the party, and has carried out the partys mass line education practice and three-three special education, but focus on the leading cadres above the county level. The two study and education, is carried out in the whole party and all the party members. This is implemented strictly administering the party, an important measure to

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