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Project Description
Pedelta participated in the bridge design of the CP1 of the HSR in California, the first construction package of the 801-mile long HSR line between Sacramento and San Diego. The expected train travel speed on this line is 220 mph, which will allow a 2 h 40’ trip from San Francisco to Los Angeles. The CP1 construction length is a 29.2-mile segment from Madera County to Fresno County, which resulted in a bid value of $ 1.08 B.
Pedelta’s services were provided during June-November 2012 and included the coordination and review of the bridges’ structural design, the compliance analysis of RFP and Design Criteria, the development of alternative technical concepts and optimizations, construction methods, detailed take-off for the structures, and quantity estimates, amongst others.
Design/Construction Approach
The main three viaducts were composed of concrete box girders, with typical spans having a length of 112 ft, while the major spans consisted of steel trusses spanning up to 331 ft. In one of the viaducts we adopted a straddle bent type of solution as a result of a very skewed crossing over the Union Pacific Railway Line. On the secondary railway and roadway bridges (over 40 structures), most of the spans were composed of precast PC girders. For each structure, we did the concept design through the analysis of various bridge alternatives (structural types, materials and span layout). We also performed an in depth seismic analysis centered on the main viaducts along with the track-structure interaction analysis. As a result, we were able to identify the most suitable and cost effective configuration of the structure.
The innovations provided by Pedelta contributed to the reduction of the anticipated bidding value of the structure by up to 40%.
