2023·4·Building Construction 650
预应力双T板肋梁端部裂缝成因及预防措施
范宗帅 冯西龙 赵 伟 刘 航
中建三局集团有限公司 北京 102629
摘要： 预应力双T板属大跨度预应力构件，在生产施工中端部及翼缘处易出现结构裂缝，影响构件质量，尤其是肋梁端
部裂缝将影响整体结构安全。通过对YTSB243 -
2型号双T板进行有限元分析，结合国内现有研究成果对双T板端部裂缝
进行综合分析，总结得出双T板端部裂缝产生的原因。结果表明：双T板肋梁较薄，端部受力较为复杂是产生结构性裂
缝的主要因素。同时在预应力筋放张过程中，预应力筋对双T板端部瞬时冲击力较大，致使端部混凝土破裂。根据端部
裂缝出现的原因，提出避免裂缝的预防控制措施，在减少端部预应力集中、增加端部抗裂性能及减少预应力筋放张冲
击力等方面采取措施，规避双T板端部开裂风险，保证预应力构件的结构安全性，同时间接提高施工效率及节约成本。
关键词： 双T板；裂缝；预应力；原因；预防措施
中图分类号：
T U 755 文献标志码： A 文章编号： 1004- 1001(2023)04- 0650-0 4 DOI： 1 0.1 4144/j. c nki. jz sg .2 023.0 4.0 09
Causes and Preventive Measures of End Cracks
of Prestressed Double-T Ribbed Beams
FAN Zongshuai FENG Xilong ZHAO Wei LIU Hang
China Construction Third Engineering Bureau Group Co., Ltd., Beijing 102629, China
Abstract:
P re str e sse d d oub le -T p la te is a la rg e-s p an p re str e sse d c om ponent. It is p ro ne to s tr u ctu ra l c ra cks a t th e e nd
a nd fla ng e d urin g p ro d uctio n a nd c onstr u ctio n, w hic h w ill a ffe ct th e q ualit y o f th e c om ponent, e sp ecia lly th e e nd c ra cks
o f th e r ib b eam , a nd a ffe ct th e o ve ra ll s tr u ctu ra l s a fe ty . T hro ug h th e fin it e e le m ent a naly sis o f Y TS B 243-2 d oub le -T p la te ,
c om bin ed w it h th e e xis tin g d om estic re se
a rc h re su lt s , th e e nd c ra cks o f d oub le -T p la te a re c om pre hensiv e ly a naly ze d ,
a nd th e c ause s o f th e e nd c ra cks o f d oub le -T p la te a re s u m mariz e d . T he re su lt s s h ow th at th e m ain fa cto rs c ausin g
s tr u ctu ra l c ra cks a re th e th in d oub le -T rib bed b eam a nd th e c om ple x s tr e ss a t th e e nd . A t th e s a m e tim e, d urin g th e
t e nsio nin g p ro cess o f th e p re str e sse d re in fo rc em ent, th e in sta nta neous im pact fo rc e o f th e p r
estr e sse d re in fo rc em ent
a t th e e nd o f th e d oub le -T p la te is la rg e, c ausin g th e e nd c oncre te to c ra ck. A ccord in g to th e c ause s o f e nd c ra cks, th e
p re ve ntio n a nd c ontr o l m easu re s to a vo id c ra cks a re p ut fo rw ard . T he m easu re s a re ta ke n to re d uce th e c oncentr a tio n
o f e nd p re str e ss, in cre ase th e e nd c ra ck r e sis ta nce a nd r e d uce th e te nsile im pact fo rc e o f p re str e sse d r e in fo rc em ent, s o
a s to a vo id th e r i
s k o f d oub le -T p la te e nd c ra cks, e nsu re th e s tr u ctu ra l s a fe ty o f p re str e ss
预应力双T板肋梁端部裂缝成因及预防措施（论文）.pdf
