Mechanical Behavior and Calculation Method for RC Fifteen-Pile Cap of Mixed Passenger and Freight Railway Bridge

Table 1

Parameter variation of influencing factors.

Influencing factors		Parameter variation
Concrete strength grade		C25, C30, C35, C40, C45
Longitudinal pile spacing		4.2 m (α = 26°), 4.8 m (α = 34°), 5.4 m (α = 41°), 6.0 m (α = 47°), 6.6 m (α = 52°)
First-floor cap thickness		2.0 m (α = 46°), 2.5 m (α = 39°), 3.0 m (α = 34°), 3.5 m (α = 30°), 4.0 m (α = 27°)
Reinforcement ratio	Uniform reinforcement	0.06%, 0.12%, 0.15%, 0.18%, 0.20%, 0.25%
	Concentrated reinforcement	12%, 0.15%
Load form		Vertical load, combined load