LFD Analysis Verification - Straight Steel I Girder Bridge

The representative bridge is a straight two-lane plate girder bridge with identical four-girder cross-sections, and features continuous three spans over span lengths of 80, 100, and 80-feet along the control centerline. In this example, I-girders are modeled using a combination of member and shell elements for refined modeling. The top flange girder is connected to the deck with rigid elements, and the bridge deck is modeled using shell elements. Modular ratios of “n” and “3n” are used for the deck slab in calculating girder stiffness and modeled as time-dependent material property.

Materials:

Steel

Concrete

Loading

Results

App linki : https://openbrim.org/objidbebs0di9oloikffv8xv9ca.project

Library linki : https://openbrim.org/objid92cvjxra3pqo5ud5vynnj.libobj

Longitudinal Dead Load Bending Moments

St.	OpenBrIM	Larsa
0	0	1.78E-05
5	177.5002	179.053
10	320.5725	323.6781
15	429.2171	433.8755
20	504.2645	509.7223
25	545.0919	551.1606
30	551.4914	558.1712
35	524.7111	531.1079
40	464.335	469.8528
45	369.5311	374.1698
50	240.8709	244.16
55	78.63995	79.87385
60	-118.019	-118.84
65	-349.362	-352.366
70	-616.525	-622.221
75	-920.678	-929.066
80	-1261.82	-1272.9
85	-930.778	-939.256
90	-636.431	-642.306
95	-378.777	-382.05
100	-156.795	-157.891
105	30.59157	31.46015
110	183.8255	186.6582
115	303.4047	307.8024
120	389.8337	394.993
125	442.1098	448.0308
130	460.1562	466.8387
135	442.0491	447.9715
140	389.7936	394.9528
145	303.3852	307.7813
150	183.8195	186.6542
155	30.60465	31.47426
160	-156.763	-157.859
165	-378.713	-381.984
170	-636.357	-642.232
175	-930.706	-939.185
180	-1261.76	-1272.84
185	-920.622	-929.012
190	-616.473	-622.17
195	-349.313	-352.319
200	-117.974	-118.797
205	78.68072	79.91351
210	240.9078	244.196
215	369.5643	374.2022
220	464.3644	469.8815
225	524.7367	531.133
230	551.5132	558.1927
235	545.1101	551.1785
240	504.2792	509.7366
245	429.2281	433.8862
250	320.5799	323.6853
255	177.5038	179.0565
260	0	3.61E-06

Girder 4 - Non-Composite Dead Load

St	OpenBrIM	Larsa
0	0	1.68E-05
5	168.5159	167.0631
10	305.5036	302.5979
15	410.963	406.6044
20	482.5552	477.5237
25	522.0345	516.5251
30	529.9855	523.9982
35	504.0285	498.4557
40	444.9568	440.3936
45	354.3568	350.8031
50	230.902	228.8318
55	73.9292	74.05332
60	-114.572	-112.253
65	-335.271	-330.629
70	-590.545	-583.063
75	-879.909	-869.586
80	-1203.36	-1190.2
85	-889.692	-879.158
90	-609.839	-601.934
95	-363.804	-358.528
100	-151.962	-148.883
105	27.45932	28.55875
110	175.6043	174.7239
115	291.3477	288.8901
120	373.5508	370.3263
125	424.4775	420.4861
130	444.0573	439.299
135	424.427	420.434
140	373.5122	370.2874
145	291.3208	288.8643
150	175.6038	174.7205
155	27.4722	28.56951
160	-151.936	-148.858
165	-363.742	-358.47
170	-609.768	-601.866
175	-889.623	-879.091
180	-1203.31	-1190.14
185	-879.855	-869.534
190	-590.495	-583.014
195	-335.225	-330.584
200	-114.529	-112.211
205	73.96857	74.09208
210	230.9377	228.8671
215	354.3888	350.8349
220	444.9851	440.4218
225	504.0531	498.4805
230	530.0065	524.0194
235	522.0519	516.5428
240	482.5691	477.5379
245	410.9734	406.6151
250	305.5105	302.605
255	168.5194	167.0666
260	0	3.32E-06

Girder 3- Composite Dead Load

St	OpenBrIM	Larsa
0	0.27	0.63
5	43.28	42.87
10	81.69	81.82
15	114.64	115.92
20	134.75	136.86
25	146.84	149.17
30	152.90	155.73
35	145.97	148.66
40	128.23	130.16
45	104.53	106.11
50	70.55	71.27
55	24.43	23.78
60	-27.52	-29.03
65	-86.57	-90.60
70	-156.06	-162.29
75	-230.51	-237.20
80	-309.21	-315.13
85	-232.36	-238.96
90	-159.98	-166.17
95	-92.48	-96.48
100	-34.77	-36.14
105	15.01	14.37
110	59.02	59.59
115	93.41	94.54
120	114.80	115.94
125	130.32	131.94
130	139.41	140.78
135	130.31	131.93
140	114.77	115.90
145	93.37	94.48
150	59.00	59.55
155	14.97	14.29
160	-34.83	-36.24
165	-92.54	-96.56
170	-160.05	-166.28
175	-232.46	-239.12
180	-309.08	-315.02
185	-230.40	-237.04
190	-155.97	-162.16
195	-86.50	-90.51
200	-27.47	-28.94
205	24.47	23.84
210	70.58	71.32
215	104.55	106.15
220	128.25	130.19
225	145.98	148.68
230	152.90	155.74
235	146.85	149.18
240	134.75	136.87
245	114.64	115.92
250	81.70	81.82
255	43.28	42.87
260	0.00	0.63

Girder 4 - Composite Dead Load

St	OpenBrIM	Larsa
0	-0.27	-0.65
5	61.53	62.51
10	108.04	108.91
15	140.13	140.14
20	165.22	164.58
25	178.48	177.71
30	177.92	176.59
35	170.50	169.16
40	154.05	153.22
45	123.69	122.83
50	83.77	83.29
55	36.16	36.45
60	-25.49	-25.08
65	-99.90	-97.82
70	-183.72	-180.43
75	-282.47	-279.86
80	-396.88	-396.32
85	-285.26	-282.78
90	-188.98	-185.86
95	-107.54	-105.73
100	-36.01	-36.05
105	23.76	23.63
110	69.59	68.76
115	105.36	104.37
120	134.46	133.75
125	149.71	148.69
130	151.66	150.97
135	149.68	148.67
140	134.45	133.76
145	105.38	104.40
150	69.60	68.78
155	23.80	23.69
160	-35.95	-35.96
165	-107.47	-105.64
170	-188.89	-185.76
175	-285.15	-282.65
180	-396.96	-396.36
185	-282.54	-279.96
190	-183.77	-180.50
195	-99.94	-97.86
200	-25.52	-25.11
205	36.14	36.43
210	83.76	83.28
215	123.69	122.83
220	154.04	153.23
225	170.49	169.17
230	177.91	176.60
235	178.48	177.72
240	165.21	164.59
245	140.13	140.15
250	108.03	108.91
255	61.53	62.51
260	0.00	-0.65

Girder 3- Positive Live Load Bending Moment

St	OpenBrIM	Larsa
0	2.308925	4.19018882
5	284.273092	358.770915
10	480.00115	551.667598
15	617.634708	678.427873
20	742.808133	787.317393
25	817.113383	852.210367
30	849.000417	865.239138
35	855.62735	876.017803
40	836.927192	853.52737
45	775.996767	794.222125
50	678.697967	721.254339
55	560.860033	652.76053
60	425.354917	519.016745
65	278.689133	400.54256
70	211.387825	300.758612
75	152.3248	175.353104
80	146.552908	135.06688
85	164.397183	179.264483
90	174.420583	267.489546
95	257.099758	324.280943
100	392.867758	428.20886
105	528.0162	547.827794
110	628.113142	656.866831
115	715.807658	740.1057
120	804.479567	837.170926
125	828.070075	883.851506
130	820.626392	903.596917
135	829.746158	910.528572
140	797.681458	846.008331
145	742.362183	763.261559
150	666.913433	687.362487
155	572.660825	590.551366
160	449.887517	472.836289
165	307.754783	370.161537
170	180.291267	303.054375
175	106.167133	187.920442
180	129.991675	130.578407
185	125.410358	227.720697
190	214.821242	336.788985
195	330.049275	435.382879
200	484.866692	589.14033
205	611.064267	692.627404
210	722.0342	752.21314
215	806.513233	817.090619
220	863.426608	874.756454
225	883.295633	886.473935
230	875.214667	872.35976
235	839.203925	860.748854
240	771.482958	786.365464
245	645.620917	688.351554
250	506.541192	576.93163
255	311.320283	351.224504
260	0.00	3.95663886

Girder 3- Negative Live Load Bending Moment

St	OpenBrIM	Larsa
0	-1.54645	-4.0418545
5	-23.276617	-27.690759
10	-46.829342	-55.7262
15	-70.449033	-84.031655
20	-94.139192	-112.60483
25	-117.81119	-141.17914
30	-141.48048	-169.72056
35	-165.18478	-198.32242
40	-188.93339	-226.97613
45	-212.71509	-255.65244
50	-236.62872	-284.53256
55	-260.72152	-313.71732
60	-286.23505	-344.14168
65	-329.42137	-398.30314
70	-403.43703	-482.60199
75	-506.72718	-520.35749
80	-686.88258	-681.05096
85	-530.88518	-513.88519
90	-384.81809	-409.6941
95	-295.36725	-357.14108
100	-235.17677	-281.32506
105	-201.19496	-241.3867
110	-191.70152	-231.61527
115	-185.89443	-224.60131
120	-180.31388	-218.06624
125	-174.74728	-189.80092
130	-175.97782	-175.16967
135	-187.61578	-207.01041
140	-199.60678	-236.64374
145	-211.58262	-249.2251
150	-224.47055	-263.22176
155	-238.28114	-278.56408
160	-267.34794	-313.05322
165	-322.52686	-382.1566
170	-404.4115	-472.62803
175	-515.82188	-522.73463
180	-638.90969	-646.928
185	-535.67628	-592.56989
190	-433.51944	-521.62989
195	-364.46009	-431.44339
200	-326.21068	-384.22007
205	-297.22111	-349.32854
210	-268.40215	-314.72618
215	-240.46539	-281.55729
220	-213.11943	-249.36119
225	-185.78653	-217.11536
230	-158.74778	-185.34491
235	-132.13622	-154.2307
240	-105.48994	-123.04962
245	-78.83115	-91.864846
250	-52.2699	-60.87201
255	-25.991042	-30.183031
260	0.00	-3.95243

Girder 4- Positive Live Load Bending Moment

St	OpenBrIM	Larsa
0	1.95663333	3.74866606
5	306.953708	299.085839
10	548.791567	528.328994
15	742.355408	715.091994
20	894.455017	840.685477
25	979.382	918.419627
30	1036.46061	966.223743
35	1032.46078	964.487147
40	988.358192	930.706135
45	906.682025	867.355743
50	775.092183	776.800273
55	614.80565	648.837258
60	441.642217	495.930985
65	349.780383	381.048969
70	309.779783	330.396768
75	353.374992	283.173382
80	411.277467	313.670308
85	502.556058	340.742192
90	412.733167	334.91789
95	365.3138	352.811208
100	430.583625	411.551702
105	537.764775	534.18181
110	690.174675	678.889251
115	826.198517	801.741882
120	929.454942	897.712781
125	993.623625	970.523291
130	1037.56826	1032.31741
135	1031.73027	1011.31033
140	992.640392	943.206253
145	932.557642	871.455079
150	824.209258	762.241337
155	685.869675	621.18352
160	524.542425	471.500265
165	364.380883	355.288545
170	226.910233	277.662263
175	158.336358	202.299468
180	184.4738	180.721071
185	165.04015	220.529652
190	228.138658	286.285271
195	377.5188	426.491949
200	580.682925	598.742891
205	761.850167	744.280593
210	914.832175	865.466165
215	1021.61508	948.777573
220	1097.70863	999.530277
225	1130.09628	1026.68811
230	1118.37091	1016.58067
235	1056.12198	960.297551
240	951.411533	854.278424
245	802.805733	733.396523
250	595.657208	548.233068
255	345.449225	299.522107
260	0.00	3.73217198

Girder 4- Negative Live Load Bending Moment

St	OpenBrIM	Larsa
0	-1.3723167	-2.4910263
5	-27.1889	-33.457534
10	-55.637775	-67.995036
15	-83.822258	-102.96839
20	-104.77297	-133.57254
25	-126.71828	-159.81345
30	-150.32758	-190.07731
35	-175.71521	-222.18976
40	-201.12943	-254.24197
45	-226.62308	-286.39447
50	-252.19039	-318.61205
55	-278.09538	-350.92252
60	-314.52206	-388.03327
65	-380.29653	-456.86324
70	-511.47092	-528.14374
75	-688.23202	-679.31307
80	-904.39943	-922.66645
85	-747.76305	-738.33058
90	-557.75159	-541.85451
95	-400.23368	-411.32114
100	-281.01098	-331.39022
105	-226.2944	-276.96498
110	-200.35952	-257.4932
115	-196.26394	-252.23054
120	-193.67781	-240.98301
125	-195.40283	-208.14182
130	-208.58441	-220.46071
135	-226.5627	-256.57955
140	-245.41735	-293.92548
145	-264.51003	-313.4218
150	-283.12182	-332.19276
155	-302.63883	-350.91374
160	-338.15445	-385.73164
165	-399.1939	-439.15689
170	-493.59862	-544.2684
175	-623.25491	-590.8338
180	-797.86146	-716.14479
185	-645.25418	-672.20584
190	-525.48428	-581.80303
195	-448.10367	-516.3685
200	-405.84999	-471.84097
205	-371.49021	-432.27272
210	-337.53848	-393.30007
215	-303.47352	-353.92703
220	-269.39348	-314.33541
225	-240.81168	-275.07437
230	-215.52436	-246.32721
235	-183.35876	-209.63704
240	-151.79168	-173.38905
245	-119.21641	-135.54599
250	-79.836483	-90.381543
255	-42.845008	-45.488332
260	0.00	-2.6838026

Vertical Reactions (Kips)

Non-Composite Dead Load

	OpenBrIM					Larsa
	Girder 1	Girder 2	Girder 3	Girder 4	Pier Total	Girder 1	Girder 2	Girder 3	Girder 4	Pier Total
Pier 1	37.5253	39.7773	39.7667	37.4521	154.5214	37.14	40.09	40.11	37.13	154.48
Pier 2	135.7755	142.0142	142.0141	135.7758	555.5796	134.42	143.34	143.34	134.42	555.51
Pier 3	135.7733	142.0111	142.0108	135.7729	555.5681	134.41	143.33	143.33	134.41	555.49
Pier 4	37.4523	39.7741	39.7681	37.4549	154.4494	37.14	40.10	40.11	37.14	154.48
Girder Total	346.5264	363.5767	363.5597	346.4557		343.11	366.86	366.90	343.10
Bridge Total					1420.119					1419.96

Composite Dead Load

	OpenBrIM					Larsa
	Girder 1	Girder 2	Girder 3	Girder 4	Pier Total	Girder 1	Girder 2	Girder 3	Girder 4	Pier Total
Pier 1	13.8294	9.1966	9.1966	13.8958	46.1184	14.17	9.06	9.04	14.18	46.45
Pier 2	48.1191	32.5259	32.5259	48.1226	161.2923	48.47	32.70	32.70	48.46	162.33
Pier 3	48.1205	32.5266	32.5267	48.1206	161.2944	48.47	32.70	32.70	48.46	162.33
Pier 4	13.8935	9.1963	9.1967	13.8944	46.1819	14.17	9.04	9.04	14.18	46.45
Girder Total	123.9635	83.4442	83.4459	124.0334		125.27	83.52	83.49	125.28
Bridge Total					414.887					417.56

Live Load

	OpenBrIM				Larsa
	Girder1	Girder2	Girder3	Girder4	Girder1	Girder2	Girder3	Girder4
Pier1	77.1775	74.2007	75.9977	76.7887	67.62	80.97	81.75	66.36
Pier2	105.3848	97.0303	97.7614	103.947	110.13	120.77	121.12	108.54
Pier3	101.7729	97.0511	97.4683	100.588	106.93	120.16	120.52	105.34
Pier4	80.1788	71.4891	75.9269	79.649	67.65	79.04	79.76	66.33

Cross Frame Axial Forces (kips)

Live Load Plus Impact

Cross Frame at Center of Span 2 Girder 2 and3

	OpenBrIM		Larsa
	Bottom Chord	Diagonals	Bottom Chord	Diagonals
Tension	13.9424	9.243	7.57	16.49
Compression	-12.4104	-9.0286	-5.51	-11.29

Bottom Flange Latheral Moments (kip-Ft)

Live Load Plus Impact

	OpenBrIM		Larsa
	Pier 2	Center Of Span 2	Pier 2	Center Of Span 2
Girder 3	2.99	1.59	3.39	1.71
Girder 4	3.29	1.60	3.97	2.21

Dead Load Vertical Deflections (inch)

Non-Composite Dead Load ( Stage 3 )

	OpenBrIM		Larsa
	0.4 Pt of Span 1	Center Of Span 2	0.4 Pt of Span 1	Center Of Span 2
Girder 3	-0.4807	-0.4991	-0.49	-0.51
Girder 4	-0.4605	-0.4781	-0.46	-0.48

Composite Dead Load ( Stage 6 )

	OpenBrIM		Larsa
	0.4 Pt of Span 1	Center Of Span 2	0.4 Pt of Span 1	Center Of Span 2
Girder 3	-0.0555	-0.0668	-0.069	-0.083
Girder 4	-0.0672	-0.0792	-0.086	-0.099