A Hybrid Approach for Project Crashing Optimization Strategy with Risk Consideration: A Case Study for an EPC Project

Table 3

Different crash cost for different crash duration.

Activity	Subsequent activity	Crash Cost; (1000USD/DAY); (k = segment 1)	Crash Cost; (1000USD/DAY); (k = segment 2)	Crash Cost; (1000USD/DAY); (k = segment 3)
J (Site Preparation)	B	0.5	1	2
A (Design and Subcontracting)	B	10	25	30
B (Piling)	C	5	5.5	8
C (Foundation)	D	4	4.5	7
D (RC 2F)	E	10	20	-
E (RC 3F)	F, G	10	20	-
F (RC 4F)	H	10	20	-
G (Arch. 2F)	H	20	30	40
H (Arch. 3F)	I	25	35	45
I (Arch. 4F to shelter &Outside)	- (FINISH)	5	8.5	10

Note: segment 1: crash duration 1-10 days.
Segment 2: crash duration 11-20 days.
Segment 3: crash duration ≥ 21 days.