Numerical Study on Energy Dissipation of Steel Moment Resisting Frames under Effect of Earthquake Vibrations

Table 3

Modeling parameters and acceptance criteria for nonlinear procedures (FEMA356, 2000).

		Modeling parameters			Acceptance criteria
	Component/action	Plastic rotation angle, radians		Residual strength ratio		Plastic rotation Angle, radians
						Primary		Secondary
		a	b	c	IO	LS	CP	LS	CP
	Beams-flexure
(a)	𝑏𝑓2𝑡𝑓≤52𝐹ye and ℎ𝑡𝑤≤418𝐹ye	9𝜃𝑦	11𝜃𝑦	0.6	1𝜃𝑦	6𝜃𝑦	8𝜃𝑦	9𝜃𝑦	11𝜃𝑦
(b)	𝑏𝑓2𝑡𝑓≥65𝐹ye or ℎ𝑡𝑤≥640𝐹ye	4𝜃𝑦	6𝜃𝑦	0.2	0.25𝜃𝑦	2𝜃𝑦	3𝜃𝑦	3𝜃𝑦	4𝜃𝑦
	Other	Linear interpolation between the values on lines a and b for both flange slenderness (first term)
		and web slenderness (second term) shall be performed, and the lowest resulting value shall be used
	Columns-flexure, for 𝑃/𝑃CL< 0.2
(a)	𝑏𝑓2𝑡𝑓≤52𝐹ye and ℎ𝑡𝑤≤300𝐹ye	9𝜃𝑦	11𝜃𝑦	0.6	1𝜃𝑦	6𝜃𝑦	8𝜃𝑦	9𝜃𝑦	11𝜃𝑦
(b)	𝑏𝑓2𝑡𝑓≥65𝐹ye or ℎ𝑡𝑤≥460𝐹ye	4𝜃𝑦	6𝜃𝑦	0.2	0.25𝜃𝑦	2𝜃𝑦	3𝜃𝑦	3𝜃𝑦	4𝜃𝑦
	Other	Linear interpolation between the values on lines a and b for both flange slenderness (first term)
		and web slenderness (second term) shall be performed, and the lowest resulting value shall be used
	Columns-flexure, for 0.2 < 𝑃/𝑃CL < 0.5
(a)	𝑏𝑓2𝑡𝑓≤52𝐹ye and ℎ𝑡𝑤≤260𝐹ye	—^1	—^2	0.2	0.25𝜃𝑦	—^3	—^1	—^4	—^2
(b)	𝑏𝑓2𝑡𝑓≥65𝐹ye or ℎ𝑡𝑤≥400𝐹ye	1𝜃𝑦	1.5𝜃𝑦	0.2	0.25𝜃𝑦	0.5𝜃𝑦	0.8𝜃𝑦	1.2𝜃𝑦	1.2𝜃𝑦
	Other	Linear interpolation between the values on lines a and b for both flange slenderness (first term)
		and web slenderness (second term) shall be performed, and the lowest resulting value shall be used

 ¹Plastic rotation = 11 (1–1.7 𝑃/𝑃_CL) 𝜃_𝑦.
²Plastic rotation = 17 (1–1.7 𝑃/𝑃_CL) 𝜃_𝑦.
³Plastic rotation = 8 (1–1.7 𝑃/𝑃_CL) 𝜃_𝑦.
⁴Plastic rotation = 14 (1–1.7 𝑃/𝑃_CL) 𝜃_𝑦.