活性粉末混凝土简支箱梁模型试验研究
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摘要
为了研究活性粉末混凝土在铁路箱梁中的结构性能和破坏状态,试验设计了1孔斜腹板薄壁活性粉末混凝土简支箱梁模型。该箱梁模型采用节段拼装制梁成孔,短线法预制,采用胶接缝。本试验完成了跨度24 m活性粉末混凝土简支箱梁的预制和拼装施工,研发了适应活性粉末混凝土箱形梁预制的钢模板系统,探索了合理的拆模、搅拌、浇筑、养护、预应力张拉工艺。通过活性粉末混凝土简支箱梁静载试验,对设计参数的选取和计算方法进行了验证。试验结果表明:梁体刚度和抗裂安全系数满足设计要求;跨中截面和1/4跨截面中性轴高度实测值均与设计值基本一致;胶接缝的抗拉弹性模量满足设计要求。
In order to study the structural performance and failure state of reactive powder concrete in railway box girder,a simple supported box girder model of thin-walled reactive powder concrete with an inclined web was designed.The box girder model segments were assembled to form holes and prefabricated by short-line method,and the epoxy joints were used.In this experiment,the prefabrication and assembly of a simple supported box girders of reactive powder concrete with a span of 24 m were completed.A steel formwork system suitable for prefabrication of reactive powder concrete box girders was developed. The reasonable technologies of dismantling,stirring,pouring,curing and tensioning were explored.The selection of design parameters and the theory of calculation method were verif ied by the static load test of a reactive powder concrete simply supported girder. The test results showthat the stiffness and safety factor of crack resistance of the girder meet the design requirements.The measured values of the neutral axis height of the mid-span section and 1/4 span cross-section are consistent with the design values. The tensile elastic modulus of the epoxy joint meets the design requirements.
In order to study the structural performance and failure state of reactive powder concrete in railway box girder,a simple supported box girder model of thin-walled reactive powder concrete with an inclined web was designed.The box girder model segments were assembled to form holes and prefabricated by short-line method,and the epoxy joints were used.In this experiment,the prefabrication and assembly of a simple supported box girders of reactive powder concrete with a span of 24 m were completed.A steel formwork system suitable for prefabrication of reactive powder concrete box girders was developed. The reasonable technologies of dismantling,stirring,pouring,curing and tensioning were explored.The selection of design parameters and the theory of calculation method were verif ied by the static load test of a reactive powder concrete simply supported girder. The test results showthat the stiffness and safety factor of crack resistance of the girder meet the design requirements.The measured values of the neutral axis height of the mid-span section and 1/4 span cross-section are consistent with the design values. The tensile elastic modulus of the epoxy joint meets the design requirements.
引文
[1]李泽良. RPC混凝土力学性能研究进展[J].科技视界,2017(15):112-113.
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[4]中华人民共和国铁道部.铁路桥涵设计基本规范:TB10002. 1—2005[S].北京:中国铁道出版社,2005.
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[6]陈慧,张西强.RPC的工程应用价值分析[J].交通科技与经济,2010(1):69-72.
[7]班新林,石龙.新型跨座式轻轨PC梁抗裂荷载静载试验分析[J].铁道建筑,2016,56(1):16-19.
[8]蒋宗全,杨忠,郭晓安,等.活性粉末混凝土配合比设计研究及生产工艺[J].铁道建筑,2010,40(7):142-144.
[9]靳士栋.RPC混凝土梁施工工艺及验收标准研究[J].山西建筑,2012,38(26):104-105.
[10]中华人民共和国铁道部.预应力混凝土铁路桥简支梁静载弯曲试验方法及评定标准:TB/T 2092—2003[S].北京:中国铁道出版社,2004.
[2]查彦宇.72 m活性粉末混凝土预制节段拼装体外预应力简支箱梁受力特性研究[D].北京:北京交通大学,2014.
[3]秦宏钢.RPC混凝土的研究[J/OL].城市建设理论研究,2015(1),1752[2015-04-27]. http://www. wanfangdata. com.cn/details/detail.do?_type=perio&id=csjsllyj2015011154.
[4]中华人民共和国铁道部.铁路桥涵设计基本规范:TB10002. 1—2005[S].北京:中国铁道出版社,2005.
[5]国家铁路局.铁路桥涵混凝土结构设计规范:TB 10092—2017[S].北京:中国铁道出版社,2017.
[6]陈慧,张西强.RPC的工程应用价值分析[J].交通科技与经济,2010(1):69-72.
[7]班新林,石龙.新型跨座式轻轨PC梁抗裂荷载静载试验分析[J].铁道建筑,2016,56(1):16-19.
[8]蒋宗全,杨忠,郭晓安,等.活性粉末混凝土配合比设计研究及生产工艺[J].铁道建筑,2010,40(7):142-144.
[9]靳士栋.RPC混凝土梁施工工艺及验收标准研究[J].山西建筑,2012,38(26):104-105.
[10]中华人民共和国铁道部.预应力混凝土铁路桥简支梁静载弯曲试验方法及评定标准:TB/T 2092—2003[S].北京:中国铁道出版社,2004.