Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (4): 44-50.doi: 10.6040/j.issn.1672-3961.0.2017.550

• Civil Engineering • Previous Articles     Next Articles

Transverse anti-cracking of bottom slab and layout of transverse pre-stressed tendon of rail transit U-shaped girder

Xu DONG1,3(),Jian GUO2,Haican ZHOU2,Zhenquan DENG3,Shuchen LI3   

  1. 1. School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China
    2. The Fifth Project Co., Ltd, China Railway Bureau 14 Group, Yanzhou 272117, Shandong, China
    3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
  • Received:2017-10-30 Online:2019-08-20 Published:2019-08-06
  • Supported by:
    国家自然科学基金资助项目(51179098);国家自然科学基金资助项目(51379113);山东省自然科学杰出青年基金资助项目(JQ201313);山东大学基本科研业务费资助项目(2014YQ005)

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Abstract:

Rail transit U-shaped girder had the structural characteristic of only arranging ordinary regular reinforcements in transverse direction of bottom slab. Based on a rail transit U-shaped girder project in Qingdao, in order to improve its safety and transverse anti-cracking performance, finite element analysis method was used to study the transverse anti-cracking and stress distribution of bottom slab of U-shaped girder. An arrangement method of U-shaped girder transverse pre-stressed tendons was put forward. The results showed that, the transverse tensile stress of bottom slab of midspan was mainly caused by self-weight and design load, while transverse tensile stress of girder ends was influenced by many factors. Under design load, maximum transverse stress of structure was 1.71 MPa, while applying 1.3 times overloading, maximum transverse stress reached 2.04 MPa, which was beyond code requirements. Safety margin of U-shaped girder was low and transverse crack resistance was weak. The proposed layout of transverse pre-stressed tendons effectively decreased transverse tensile stress in bottom slab of girder midspan to -0.117 MPa. The distribution of tensile stress became more uniform and structural safety was significantly improved. The research could provide a reference for transverse reinforcement design of U-shaped girder bottom slab.

Key words: U-shaped girder, bottom slab anti-cracking, FEA model, transverse stress, transverse pre-stressing force, reinforcement design

CLC Number: 

  • U233

Fig.1

Section sizes of U-shaped girder and pre-stressed tendons arrangement"

Table 1

Design parameters of longitudinal pre-stressed tendons"

钢束编号 类型 根数 布置位置 张拉控制应力/MPa
N1, N′1 Φs 15.2 7 腹板 1 246.2
N2, N′2 Φs 15.2 11 底板 1 339.2
N3, N′3 Φs 15.2 10 底板 1 339.2
N4, N′4 Φs 15.2 10 底板 1 339.2
N5, N′5 Φs 15.2 10 底板 1 339.2

Fig.2

The finite element model of U-shaped girder"

Fig.3

Stress-strain relationship of PFRC"

Fig.4

Technical parameters of type B vehicle"

Fig.5

Schematic diagram of the most unfavorable loading position of biaxial bending moment"

Fig.6

Transverse stress of bottom slab after tensioning longi-tudinal pre-stressed tendons N2~N5 and N′2~N′5"

Fig.7

Transverse stress of bottom slab after tensioning longitu-dinal pre-stressed tendons N1 and N′1(half model)"

Fig.8

Transverse stress (S11) diagram of midspan section of U-shaped girder under design load"

Fig.9

Transverse stress diagram of midspan section ofU-shaped girder at overload stage"

Fig.10

Top view of layout of bottom slab transverse and longitudinal pre-stressed tendons of U-shaped girder"

Fig.11

Cross sectional drawing of layout of bottom slab transverse pre-stressed tendons of U-shaped girder"

Fig.12

Transverse stress of midspan section of U-shaped girderunder design load after laying transverse pre-stressed tendons"

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