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基于无应力状态量的平面梁节段预制构形计算方法
但启联1, 秦顺全1,2, 魏凯1, 邓鹏1, 苑仁安1,2
1.西南交通大学 土木工程学院, 成都 610031;2.中铁大桥勘测设计院集团有限公司, 武汉 430050
摘要:
为探讨平面梁单元无应力状态量与单元预制构形的关系,通过分析平面梁单元在节点位移下的几何构形变化,建立了平面梁单元预制构形参数与单元无应力状态量之间的数学关系,并以悬臂梁为例,以两种线形为输入,对关系式进行验证。结果表明,单元无应力构形与单元无应力状态量之间相互对应,不同的单元无应力状态量对应不同的单元预制构形;两种线形对应的单元预制构形不相同,但二者对主梁节段拼装时节点标高控制无本质影响。对实际工程而言,只要确保节点标高满足目标线形标高控制要求,梁段的预制构形可不同。
关键词:  平面梁  分阶段成形结构  预制节段  无应力状态量  预制构形  施工
DOI:10.11835/j.issn.2096-6717.2019.075
分类号:U445.47
基金项目:中国工程院重点咨询研究项目(2016-XZ-13);中央高校基本科研业务费(A0920502051707-2-027)
Calculation of precast configuration based on unstressed state amount for plane beam elements
Dan Qilian1, Qin Shunquan1,2, Wei Kai1, Deng Peng1, Yuan Ren'an1,2
1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China;2.China Railway Major Bridge Reconnaissance & Design Group Co., Ltd., Wuhan 430050, P. R. China
Abstract:
In order to investigate the relationship between the unstressed state amount and the prefabricated configuration of the plane beam element, a mathematical relationship between parameters of the prefabricated configuration and the unstressed state amount of the plane beam element was established by analyzing the geometrical configuration of the plane beam element considering the displacement of the joint. Taking a cantilever beam as an example, two types of alignment were used as inputs to verify the proposed mathematical relationship. The results show that the unstressed configuration is uniquely associated with the unstressed state amount of the element. The unstressed state amounts of different elements correspond to different prefabricated configurations. Although the prefabricated configurations of the two alignments are different, they have minimal influence on the joint elevation control when assembling the main beam segments. In engineering practice, the prefabricated configuration of the beam segment can be different as long as the joint elevation satisfies the elevation requirement of the target alignment.
Key words:  plane beam  structure formed in stages  precast segments  unstressed state amount  precast configuration  construction
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