Problem Description

A one-story, one-bay in each direction, three-dimensional, fixed-base frame made of 2-inch steel pipe segments and 2.75-inch steel cubes is analyzed for the first 24 modal frequencies using eigenvectors. The frame is Problem No. 1 from the ASME 1972 Program Verification and Qualification Library (reference ASME 1972).
The material and section properties, and the mass at each node, shown in the figure below are consistent with those used in the above mentioned references. Because masses are specified in three directions at 14 nodes, this problem has a total of 3 * 14 = 42 dynamic degrees of freedom.

Library

Object Link: https://bim.aecbolt.com/objidnsm7hoppi3c7n93etxw2.libobj

Results Comparison

Mode	Output Parameter	AEC\|BOLT BIM Cloud App	SAP2000	Independent	Percent Difference AEC\|BOLT BIM Cloud App - Independent	Percent Difference SAP2000 - Independent
1	Frequency	111.2411	112	112	0.68%	0%
2	Frequency	115.8023	117	116	0.17%	1%
3	Frequency	137.1839	138	138	0.59%	0%
4	Frequency	215.8188	218	218	1%	0%
5	Frequency	404.1598	415	404	0.04%	3%
6	Frequency	422.5049	434	423	0.12%	3%
7	Frequency	451.4506	463	452	0.12%	2%
8	Frequency	548.8523	561	554	0.93%	1%
9	Frequency	733.3078	752	736	0.37%	2%
10	Frequency	758.2787	777	762	0.49%	2%

Tested Features

Three-dimensional frame analysis
Modal analysis using eigenvectors
Joint mass assignments

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