Effect?of?Prestressed?Force?on?Arch?of?Simply?Supported?Beam?Bridge

doi:10.3969/j.issn.1674-0696.2009.06.05

Journal of Chongqing Jiaotong University(Natural Science) ›› 2009, Vol. 28 ›› Issue (6): 995-997.DOI: 10.3969/j.issn.1674-0696.2009.06.05

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Effect?of?Prestressed?Force?on?Arch?of?Simply?Supported?Beam?Bridge

MA Chun-jia¹, FENG Xiao-hao²

?1.?School?of?Civil?Engineering?＆?Architecture,?Chongqing?Jiaotong?University,?Chongqing?400074,?China?;??2.?School?of?Civil?Engineering,?Southwest?Jiaotong?University,?Sichuan?Chengdu?610031,?China

Received:2009-05-22 Revised:2009-07-30 Online:2009-12-15 Published:2015-04-15

预应力度对简支梁桥上拱的影响

马春佳¹,冯小豪²

1.重庆交通大学土木建筑学院,重庆400074;2.西南交通大学土木工程学院,四川成都610031

作者简介:马春佳(1984—),男,河北石家庄人,硕士研究生,研究方向为桥梁结构设计理论。E-mail:mcj8498@126.com。

Abstract

Abstract: For?flexural?members?of?prestressed?concrete,?exerting?prestressed?force?on?it?will?generate?an?upward?arch,?and?the?prestressed?force?directly?affects?the?arch?size?of?prestressed?concrete?structures.?Taking?Pingtanzi?Bridge?located?at?K?44?＋?528?section?of?Chongqing?Yu-Qian?Expressway?as?an?example,which?has?obvious?upward?arch?problem,?different?upward?arch?values?caused?by?the?partial?prestressed?component?of?A?and?that?of?B?are?analyzed?by?making?use?of?the?designing?parameters.?The?effect?of?prestressed?force?on?arch?of?PC?simply?supported?beam?bridge?is?obtained.?The?result?indicates?that?the?large?prestressed?force?will?make?girder?generate?large?arch?values.

Key words: simply supported plate girder , creep of arch , partial prestressed component of A , partial prestressed component of B ;

摘要： 对于预应力混凝土(PC)受弯构件,施加预应力将使其产生向上的反拱挠度,预应力度的大小直接影响着预应力混凝土构件上拱值。依托出现明显上拱问题的渝黔高速公路K44平摊子大桥,利用其设计参数,分析部分预应力A类构件和B类构件2种预应力度时所产生的不同上拱度值,得出预应力度对PC简支梁桥上拱的影响。分析表明,预应力度过大将导致梁体产生过大的上拱值。

关键词: 简支板梁, 徐变上拱, 部分预应力A类构件, 部分预应力B类构件

CLC Number:

U448.35

MA Chun-jia, FENG Xiao-hao. Effect?of?Prestressed?Force?on?Arch?of?Simply?Supported?Beam?Bridge[J]. Journal of Chongqing Jiaotong University(Natural Science), 2009, 28(6): 995-997.

马春佳,冯小豪. 预应力度对简支梁桥上拱的影响[J]. 重庆交通大学学报（自然科学版）, 2009, 28(6): 995-997.

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Effect?of?Prestressed?Force?on?Arch?of?Simply?Supported?Beam?Bridge

预应力度对简支梁桥上拱的影响

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