Layout Optimization of Rail Expansion Joint on Long-Span Cable-Stayed Bridge for High-Speed Railway

Table 1

Main parameters.

Structure	Items	Units	Simply supported beam	Steel box beam
Beam	Modulus of elasticity	N/m^2	3.6 × 10^10	2.1 × 10^11
	Poisson ratio	—	0.2	0.3
	Coefficient of thermal expansion	/°C	1.0 × 10^−5	1.2 × 10^−5
	Density	kg/m^3	2625	7875
Main tower	Modulus of elasticity	N/m^2	3.6 × 10^10
	Poisson ratio	—	0.2
	Coefficient of thermal expansion	/°C	1 × 10^−5
	Density	kg/m^3	2625
Stay cable	Elastic modulus of stay cable material	N/m^2	1.98 × 10^11
	Cross-sectional area	m^2	1.16 × 10^−2
	Poisson ratio	—	0.3
	Coefficient of thermal expansion	/°C	1.2 × 10^−5
Rail CHN60	Modulus of elasticity	Pa	2.06 × 10^11
	Cross-sectional area	m^2	7.745 × 10^−3
	Poisson ratio	—	0.3
	Coefficient of thermal expansion	/°C	1.18 × 10^−5
	Density	kg/m^3	7850