Journal of Shandong University(Engineering Science) ›› 2022, Vol. 52 ›› Issue (4): 139-150.doi: 10.6040/j.issn.1672-3961.0.2022.046

• Civil Engineering—New Materials & Structures • Previous Articles     Next Articles

Research and optimization of hollow form of precast concrete pavement slab

Xuhao WANG1(),Qianqian LIU1,Hucheng LI2,cheng LI1,Peng LI1,Yifeng LING3,*()   

  1. 1. School of Highway, Chang′an University, Xi′an 710064, Shaanxi, China
    2. China Railway First Survey and Design Institute Group Co., Ltd., Xi′an 710043, Shaanxi, China
    3. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China
  • Received:2022-01-24 Online:2022-08-20 Published:2022-08-24
  • Contact: Yifeng LING E-mail:wangxh@chd.edu.cn;yfling@sdu.edu.cn

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Abstract:

In order to reduce the self-weight of precast concrete pavement slab, the concrete hollow slab was studied by using ABAQUS, the optimal length, width and thickness and circular hollow type of precast concrete solid slab were recommended. The local sizes of the circular section were optimized, and the influences of the radius, numbers and height of circle on the maximum flexural-stress, the maximum vertical displacement, the maximum compressive stress and shear stress of the slab were analyzed. Entropy weight method and technique for order preference by similarity to an ideal solution method were introduced to optimize multiple parameters, and the optimal hollow combination was obtained as 10 circles with a radius of 60 mm and a center height of 160 mm. By comparing the mechanical performance of hollow slab with solid slab, it was found that the difference was marginal, while optimized hollow slab could lead to a 970 kg self-weight reduction. The precast concrete hollow slab, the circular hollow type and its local size were proposed and recommended.

Key words: precast concrete pavement, hollow form, optimization of local size, finite element simulation, mechanical response

CLC Number: 

  • U416

Table 1

Material design parameters of each structural layer of pavement"

类型 长/m 宽/m 厚度/m 弹性模量/MPa 泊松比
水泥面层 25 000 0.15
柔性基层 12 4.5 0.3 500 0.25
路基 12 4.5 3.0 30 0.40

Fig.1

Structural model of precast concrete pavement"

Fig.2

Standard axle load diagram"

Fig.3

The load is applied to slab center, slab edge and slab angle respectively"

Table 2

Orthogonal test scheme for dimensional structure optimization  m"

试验号 长度 宽度 厚度
1 4.0 3.0 0.22
2 4.0 3.5 0.24
3 4.0 4.0 0.26
4 4.0 4.5 0.28
5 4.5 3.0 0.24
6 4.5 3.5 0.22
7 4.5 4.0 0.28
8 4.5 4.5 0.26
9 5.0 3.0 0.26
10 5.0 3.5 0.28
11 5.0 4.0 0.22
12 5.0 4.5 0.24
13 6.0 3.0 0.28
14 6.0 3.5 0.26
15 6.0 4.0 0.24
16 6.0 4.5 0.22

Table 3

Mechanical responses ofslabs with different sizes under different loading positions"

试验号 板底最大弯拉应力/MPa 板块最大竖向位移/mm
板中受力 板边受力 板角受力 板中受力 板边受力 板角受力
1 0.618 7 0.665 5 0.691 7 0.324 5 0.422 0 0.526 3
2 0.591 0 0.598 2 0.641 7 0.307 6 0.411 4 0.503 7
3 0.608 4 0.686 4 0.651 4 0.283 3 0.403 4 0.484 2
4 0.551 7 0.638 5 0.578 5 0.271 0 0.411 3 0.483 5
5 0.548 2 0.618 4 0.607 0 0.302 1 0.386 4 0.491 4
6 0.679 3 0.638 0 0.748 0 0.327 6 0.425 6 0.532 9
7 0.544 1 0.639 9 0.582 5 0.267 3 0.367 0 0.452 7
8 0.641 3 0.687 5 0.676 6 0.289 0 0.420 9 0.506 6
9 0.557 7 0.709 9 0.609 6 0.270 8 0.343 5 0.451 5
10 0.524 0 0.648 2 0.572 4 0.251 1 0.337 1 0.432 2
11 0.710 3 0.632 8 0.775 7 0.336 1 0.443 7 0.554 9
12 0.647 9 0.588 0 0.687 6 0.322 0 0.448 6 0.553 4
13 0.498 1 0.662 9 0.541 8 0.250 0 0.311 5 0.420 6
14 0.599 3 0.699 8 0.659 3 0.266 1 0.343 6 0.451 5
15 0.627 2 0.602 2 0.682 6 0.308 8 0.405 5 0.512 5
16 0.735 3 0.641 1 0.788 6 0.350 7 0.479 8 0.592 6

Fig.4

The influence of length, width and thickness on the maximum vertical displacement of slab"

Fig.5

The influence of length, width and thickness on the maximum flexural-tensile stress of slab bottom"

Table 4

Four hollow forms and dimensions"

形状 空心图示 尺寸图示
六角形
工字形
圆形
半圆形

Fig.6

Flexural tensile stress of the hexagonal hollow slab when load is applied to different positions"

Fig.7

Flexural tensile stress of the I-shaped hollow slab when load is applied to different positions"

Fig.8

Flexural tensile stress of the semicircle hollow slab when load is applied to different positions"

Fig.9

Flexural tensile stress of the circular Hollow slab when load is applied todifferent positions"

Table 5

Maximum of mechanical response under four hollow forms"

空心形式 最大弯拉应力/MPa 最大竖向位移/mm 最大压应力/MPa
六角形 2.99 0.20 1.99
工字形 4.90 0.22 3.31
半圆形 2.50 0.20 1.70
圆形 2.36 0.19 1.45

Table 6

Design of local dimension test scheme for circular hollow form"

水平 圆心高度/mm 圆形半径/mm 圆形个数
1 120 60 10
2 130 70 11
3 140 80 12
4 150 90 13
5 160 100 14

Table 7

The values of mechanical response index of different local dimensions of circular hollow form"

试验编号 半径/mm 圆形个数 圆心高度/mm 薄壁处最大压应力/MPa 板底最大弯拉应力/MPa 薄壁处最大剪应力/MPa 最大竖向位移/mm
1 60 10 120 0.93 1.82 0.35 0.178
2 60 11 130 0.99 1.77 0.47 0.179
3 60 12 140 1.07 1.71 0.60 0.179
4 60 13 150 1.15 1.65 0.73 0.179
5 60 14 160 1.13 1.50 0.87 0.181
6 70 10 130 0.90 1.79 0.53 0.182
7 70 11 140 0.99 1.74 0.66 0.182
8 70 12 150 1.09 1.69 0.81 0.183
9 70 13 160 1.15 1.64 0.93 0.183
10 70 14 120 0.85 2.31 0.66 0.186
11 80 10 140 0.88 1.79 0.72 0.186
12 80 11 150 0.97 1.74 0.85 0.184
13 80 12 160 1.06 1.70 0.96 0.183
14 80 13 120 0.77 2.37 0.68 0.186
15 80 14 130 0.85 2.21 0.71 0.186
16 90 10 150 0.86 1.75 0.93 0.190
17 90 11 160 0.94 1.70 1.05 0.191
18 90 12 120 0.64 2.42 0.79 0.194
19 90 13 130 0.72 2.35 0.92 0.195
20 90 14 140 0.79 2.29 1.05 0.194
21 100 10 160 0.84 1.71 1.12 0.194
22 100 11 120 0.53 2.39 0.85 0.201
23 100 12 130 0.63 2.34 0.98 0.201
24 100 13 140 0.71 2.30 1.14 0.199
25 100 14 150 0.78 2.25 1.27 0.202

Table 8

The mean values of mechanical response indexes under different radius, numbers, height of the circle"

水平 板底最大弯拉应力/MPa 最大竖向位移/mm 薄壁处最大压应力/MPa 薄壁处最大剪应力/MPa
圆形半径 圆形个数 圆心高度 圆形半径 圆形个数 圆心高度 圆形半径 圆形个数 圆心高度 圆形半径 圆形个数 圆心高度
1 1.690 1.722 2.262 0.179 0.186 0.189 1.054 0.882 0.744 0.604 0.730 0.666
2 1.834 1.868 2.092 0.183 0.187 0.189 0.996 0.884 0.818 0.718 0.776 0.722
3 1.962 1.972 1.966 0.185 0.188 0.188 0.906 0.898 0.888 0.784 0.828 0.834
4 2.102 2.062 1.816 0.193 0.188 0.188 0.790 0.900 0.970 0.948 0.880 0.918
5 2.198 2.112 1.650 0.199 0.190 0.186 0.698 0.880 1.024 1.072 0.912 0.986
极差 0.508 0.340 0.612 0.020 0.004 0.003 0.356 0.020 0.280 0.468 0.182 0.320

Fig.10

The maximum stress of the slab under different radius, numbers, center height of the circle"

Fig.11

The maximum vertical displacement of the slab under different radius, numbers, center height of the circle"

Fig.12

Comparison of flexural-tensile stress between hollow slab and solid slab"

Fig.13

Comparison of vertical displacement between hollow slab and solid slab"

Fig.14

Lap method of the slab"

Table 9

Calculation results of the slab using trapezoidal lapping way"

力学响应位置 最大主应力/MPa 剪应力/MPa 最大竖向位移/mm
受荷板一侧 1.179 0.200 0.516
未受荷板一侧 1.089 0.122 0.510

Fig.15

Vertical displacement response diagram of adjacent plates in trapezoidal lap way"

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