Calculation method and flexural mechanical behavior of PC wide-shallow web T-girders(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年3期
- Page:
- 75-85
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Calculation method and flexural mechanical behavior of PC wide-shallow web T-girders
- Author(s):
- TANG Chenhao1; ZHANG Gang1; HOU Yonggang2; SONG Chaojie1; LU Zelei1; ZHU Jianrui1; XIE Bo3
- (1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. Ningxia HighwaySurvey and Design Institute Co Ltd, Yinchuan 750000, Ningxia, China;3. Road & Bridge South China Engineering Co.,Ltd., Guangzhou 528404, Guangdong, China)
- Keywords:
- bridge engineering; mechanical behavior; numerical simulation; PC wideshallow web Tgirder; temperature effect
- PACS:
- -
- DOI:
- -
- Abstract:
- Aimed at the problems in the design and application of prestressed concrete (PC) wideshallow web Tgirders, the calculation method for determining the basic section property of PC wideshallow web Tgirders and the 20 m span engineering model was established, then the numerical simulation method that verified by experimental was used to study the flexural mechanical behavior of PC wideshallow web girders. The PC wideshallow web Tgirders flexural mechanical response under the influence of different design parameters, the cooperative working performance with hollow slab girders and the deformation mechanism under different sunshine angles were explored to obtain the mechanical behavior response rule and temperature effect feedback. The results show that the established calculation method can be used to calculate the section parameters of PC wideshallow web Tgirders quickly. The flexural stiffness and flexural bearing capacity of PC wideshallow web Tgirders at yield stage can be effectively improved with increased reinforcement. But only increasing the strength of concrete or only increasing the prestress degree has little effect on the whole process flexural stiffness and flexural bearing capacity. PC wideshallow web Tgirders have the ability to work in conjunction with hollow slab to replace the hollow slab girders with serious diseases. PC wideshallow web Tgirders produce a larger flexural up warping in midspan and a larger tensile stress on joints under the action of large temperature difference, so that the stiffness of the transverse connection must be enhanced and the additional of steel mesh is recommended to ameliorate cracking. The distribution of temperature difference stress in the web of PC wideshallow web Tgirder is an exponential function, and the local temperature distribution of the web is more uniform than that of the PC highthin web girder. The proposed temperature difference stress distribution formula is concise, convenient and easy for engineering application. The proposed design suggestions can be provided theoretical guidance for the lifetime construction and safe operation of such bridges. 2 tabs, 15 figs, 31 refs.
Last Update: 2021-06-04