Design and Model Test of a Modularized Prefabricated Steel Frame Structure with Inclined Braces

Table 4

Comparison of mechanical performance under three load states.

Horizontal load	24 kN	59 kN	105 kN
Specimen 1	There are small yielding zones in the connections between web members and chord members	Strain gages 25 and 29 yield; the ends of web members yield	Number 20 web member buckles, and story drift angles are 1/101 and 1/116
Specimen 2	There are small yielding zones in the connection between web members and chord members	Strain gages 28 and 29 yield; the ends of web members yield	Number 20 web member buckles, and story drift angles are 1/102 and 1/115
Finite element analysis using line elements	The maximum stress 177 MPa occurred on the column	The maximum stress of web members is 360 MPa	The axial average stress of numbers 19 and 20 web members reaches design strength, and story drift angles are 1/169 and 1/170
Equivalent stress ratio using design formulas	Numbers 19 and 20 members are 0.46 and 0.45	Numbers 19 and 20 members are 0.99 and 1.01	Numbers 19 and 20 members are 1.14 and 1.24