we are widening 35'(existing) wide bridge to 67'(proposed). Bride is steel multi-girder with concrete deck (composite) and four spans; two middle spans are 70' each and exterior spans are 36' each.All four spans are simple supported with one fixed and one expansion bearing. Existing piers are concrete rigid frame type (three columns).The widening is carried out by adding 16' wide concrete slab supported by two new steel girders either side of bridge(35+16+16=67'). The new girders are supported by extending the existing piers (adding one column either side) and abutment. The foundation of new columns are connected to the old foundation of pier. The concrete connection between old and new structures (pier/columns foundation, cap beam, deck slab) are fixed.New deck slab also have transverse joints to allow longitudinal expansion and contraction.
My question are:
1. would shrinkage and thermal load in transverse direction critical for proposed bridge pier(5 columns) and bridge bearing?? What reference do we need to use to quantify above items.
2. What is the other possible effect of concrete shrinkage and thermal load to the bridge piers and bearing in this structure due to proposed modification?
Thanks
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