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A rotor blade of a wind turbine having a pultruded spar cap is disclosed. The rotor blade includes a blade root and a blade tip. The blade root includes at least one root insert. The rotor blade also includes at least one spar cap constructed of a plurality of pultruded members grouped together to f

A rotor blade of a wind turbine having a pultruded spar cap is disclosed. The rotor blade includes a blade root and a blade tip. The blade root includes at least one root insert. The rotor blade also includes at least one spar cap constructed of a plurality of pultruded members grouped together to form one or more layers from the blade tip towards the blade root. Further, the pultruded members separate into one or more pultruded member bundles as the spar cap approaches the blade root. The pultruded member bundles fit within the root insert, along with the blade bolts, such that compression and tension loads of the rotor blade are transferred through the pultruded members.

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1. A rotor blade of a wind turbine, comprising: a blade root and a blade tip, the blade root comprising at least one root insert, the root insert comprising a root plate having one or more circumferentially-spaced openings; and,at least one spar cap comprising a plurality of pre-cured composite memb

1. A rotor blade of a wind turbine, comprising: a blade root and a blade tip, the blade root comprising at least one root insert, the root insert comprising a root plate having one or more circumferentially-spaced openings; and,at least one spar cap comprising a plurality of pre-cured composite members grouped together to form one or more layers from the blade tip towards the blade root,wherein the pre-cured composite members separate into one or more member bundles as the spar cap approaches the blade root, the one or more circumferentially-spaced openings of the root plate configured to receive the one or more member bundles. 2. The rotor blade of claim 1, wherein the blade root further comprises one or more blade bolts configured to secure the rotor blade to a hub of the wind turbine, wherein each of the blade bolts comprises a first end and an opposing, second end. 3. The rotor blade of claim 2, wherein the one or more circumferentially-spaced openings are further configured to receive the first ends of the blade bolts. 4. The rotor blade of claim 3, wherein one or more of the circumferentially-spaced openings further comprise at least one of threads, or a predetermined roughness configured to improve bonding between the member bundles and the root plate. 5. The rotor blade of claim 1, wherein the member bundles are more densely spaced in the root insert in a flap-wise direction than an edge-wise direction. 6. A method of forming a spar cap of a rotor blade of a wind turbine, the method comprising: providing a plurality of pultruded members on at least one of a pressure side or a suction side of the rotor blade, each of the pultruded members comprising a first segment and second segment;joining the first segments of the pultruded members together to form a first portion of the spar cap;separating the second segments of the pultruded members into a plurality of pultruded member bundles to form a second portion of the spar cap;inserting the separated pultruded member bundles of the spar cap into a blade root insert of a blade root of the rotor blade, the blade root insert comprising a plurality of hollow root members circumferentially arranged in the blade root insert, each of the hollow root members comprising an open passageway extending from a first end to a second end, the pultruded member bundles being inserted into the second ends of the open passageways. 7. The method of claim 6, further comprising securing the rotor blade to a hub of the wind turbine via a plurality of blade bolts. 8. The method of claim 7, further comprising inserting the blade bolts into the first ends of the open passageways. 9. The method of claim 6, further comprising securing the pultruded member bundles within the blade root insert by at least one of: heating the blade root insert and allowing the blade root insert to cool around the pultruded member bundles or threading the blade root insert onto the pultruded member bundles. 10. A rotor blade of a wind turbine, comprising: a first blade segment and a second blade segment secured together at a blade joint;at least one spar cap configured on at least one of a pressure side or a suction side of the first or second blade segments, the spar cap comprising a plurality of pultruded members grouped together to form a first portion of the spar cap, wherein the pultruded members separate into one or more pultruded member bundles as the spar cap approaches the blade joint so as to form a second portion of the spar cap; and,a blade joint insert arranged at the blade joint, the blade joint insert comprising one or more peripherally-spaced openings that receive the separated pultruded member bundles to join the first blade segment and the second blade segment. 11. The rotor blade of claim 10, wherein each of the hollow root members comprise an arcuate cross-sectional shape. 12. The rotor blade of claim 11, wherein each of the one or more member bundles comprises a cross-sectional shape corresponding to the cross-sectional shape of one of the hollow root members. 13. The rotor blade of claim 10, wherein the open passageways further comprises at least one of threads, or a predetermined roughness configured to improve bonding of the member bundles and the hollow root members. 14. The rotor blade of claim 10, wherein the one or more peripherally-spaced openings of the blade joint insert are formed in at least one of a joint plate or a plurality of hollow joint members circumferentially arranged at a predetermined span-wise location of the rotor blade. 15. The rotor blade of claim 14, wherein each of the hollow joint members comprises an open passageway extending from a first end to a second end, the one or more pultruded member bundles being inserted into the open passageways so as to join the first blade segment and the second blade segment. 16. The rotor blade of claim 15, wherein the first ends of the open passageways are configured to receive first ends of the blade bolts and the second ends of the open passageways are configured to receive the one or more pultruded member bundles.