Mechanical Properties and Reinforcement Method of Misaligned Thick Plate Cross Joints in Steel Bridge

doi:10.12068/j.issn.1005-3026.2024.05.016

Abstract

Abstract:

Aiming at the problem of misalignment defects in the cross joint of thick plates in steel bridges， the finite element method was used to study the influence of misalignment defects on the mechanical properties of cross joints of thick plate， and a reinforcement method of welding separated steel plates was proposed and the size of the steel plate for reinforcement was optimized. The results show that misalignment defects have a signficiant effect on the mechanical properties of cross joints of thick plate， and the vertical stress increases significantly under the influence of additional bending moment. The proposed reinforcement method of welding separated steel plates makes the vertical support plate of cross joint bear most of the axial force and bending moment after reinforcement. The key section for design is located near the weld at the bottom of the steel plate for reinforcement， and the efficiency of reinforcement can be improved by increasing the height of the steel plate for reinforcement， up to 48%. Different sizes of steel plates for reinforcement are recommended for cross joints with different misalignments， which can provide a reference for the reinforcement methods of misaligned thick plate cross joints in similar projects.

Key words: steel bridge, cross joint, misalignment defect, reinforcement method, finite element method

CLC Number:

U 441

Chong SHEN, Qing-tian SU, You-sheng CHEN. Mechanical Properties and Reinforcement Method of Misaligned Thick Plate Cross Joints in Steel Bridge[J]. Journal of Northeastern University(Natural Science), 2024, 45(5): 729-737.

Figures/Tables 13

Fig.1 Structure of arch‐tie beam connection

Fig.2 Simplified mechanical model of misaligned thick plate cross joint

Fig.3 Finite element models

Fig.4 Vertical stress nephogram of cross joint

Fig.5 Reinforcement method of welding separatedsteel plates

Fig.6 Finite element model of reinforced cross joint

Fig.7 Vertical stress nephogram of reinforced crossjoint

Fig.8 Internal force distribution of reinforced cross joint

Fig.9 Influence of the height of the steel plates forreinforcement on mechanical properties ofcross joint

Fig.10 Influence of the thickness of the steel platesfor reinforcement on mechanical propertiesof cross joint

Table 1 Axial force of critical sections of reinforced cross joint

$h r$ /mm	截面①		截面②		截面③
$h r$ /mm	$F r ?$ /kN	$F s ?$ /kN	$F r ?$ /kN	$F s ?$ /kN	$F s ?$ /kN
200	551	187	364	280	576
300	614	137	328	276	540
400	666	101	292	277	510
500	705	75	257	282	486
600	733	58	224	290	466
700	753	47	194	298	450

Table 1 Axial force of critical sections of reinforced cross joint

$h r$ /mm	截面①		截面②		截面③
$h r$ /mm	$F r ?$ /kN	$F s ?$ /kN	$F r ?$ /kN	$F s ?$ /kN	$F s ?$ /kN
200	551	187	364	280	576
300	614	137	328	276	540
400	666	101	292	277	510
500	705	75	257	282	486
600	733	58	224	290	466
700	753	47	194	298	450

Table 2 Bending moment of critical sections of reinforced cross joint

$h r$ /mm	截面①		截面②		截面③
$h r$ /mm	$M r ?$ /(kN·m)	$M s ?$ /(kN·m)	$M r ?$ /(kN·m)	$M s ?$ /(kN·m)	$M s ?$ /(kN·m)
200	8.5	42.2	2.6	47.4	118.6
300	9.0	51.1	2.5	44.5	106.0
400	9.5	58.6	2.1	40.0	93.6
500	10.0	64.0	1.4	35.0	80.9
600	10.4	67.8	0.7	30.0	69.0
700	11.0	70.4	0.1	25.0	58.0

Table 2 Bending moment of critical sections of reinforced cross joint

$h r$ /mm	截面①		截面②		截面③
$h r$ /mm	$M r ?$ /(kN·m)	$M s ?$ /(kN·m)	$M r ?$ /(kN·m)	$M s ?$ /(kN·m)	$M s ?$ /(kN·m)
200	8.5	42.2	2.6	47.4	118.6
300	9.0	51.1	2.5	44.5	106.0
400	9.5	58.6	2.1	40.0	93.6
500	10.0	64.0	1.4	35.0	80.9
600	10.4	67.8	0.7	30.0	69.0
700	11.0	70.4	0.1	25.0	58.0

Table 3 Reasonable size and reinforcement efficiency

$δ m$ /mm	$h r$ /mm	$d r$ /mm	$σ p$ /MPa	$σ r$ /MPa	$σ s$ /MPa	$η$ /%
0	—	—	106	—	—	—
10	400	20	128	112	75	13
20	500	20	156	120	100	23
30	600	28	187	132	105	29
40	700	28	214	131	130	39
50	800	36	239	134	130	44
60	800	40	260	144	150	45
80	900	44	296	148	177	50
100（2.5 d）	1000	48	321	150	218	53

Table 3 Reasonable size and reinforcement efficiency

$δ m$ /mm	$h r$ /mm	$d r$ /mm	$σ p$ /MPa	$σ r$ /MPa	$σ s$ /MPa	$η$ /%
0	—	—	106	—	—	—
10	400	20	128	112	75	13
20	500	20	156	120	100	23
30	600	28	187	132	105	29
40	700	28	214	131	130	39
50	800	36	239	134	130	44
60	800	40	260	144	150	45
80	900	44	296	148	177	50
100（2.5 d）	1000	48	321	150	218	53

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