A load resisting system comprising a plurality of arched tubular support members (2, 50a-50c, 60a-60c, 70a-70c, 80a-80c, 90a-90c, 100a-100c 110a-110c), each tubular support member being formed of a polymer material, each tubular support member being substantially oriented in a vertical plane, wherein: the tubular support members collectively form the load resisting system, the tubular support members comprising a plurality of longitudinal, substantially parallel, at least partially hollow structural members operatively connected by at least one connector member, the tubular support members being operatively connected to at least one or more lateral force resisting members (62a-62c, 71a, 71b, 72a, 72b, 73a, 73b, 85a, 85b, 92a-92c, 102a, 102b, 103a, 103b, 112), the lateral force resisting members being positioned in a direction perpendicular to the vertical plane of the tubular support members, the lateral force resisting members being capable of transferring vertical loads to the tubular support members and to providing lateral-load strength to the load resisting system, the lateral force resisting members comprising at least one corrugated sheet (92a-92c, 102a, 102b, 103a, 103b, 112), where the sheet corrugations run in a direction perpendicular to the vertical direction of the tubular support members, the lateral force resisting members comprising at least one of metal, fiber reinforced polymer materials, extruded PVC materials, polycarbonate materials, or wood-plastic composites; characterised in that the tubular support members are formed of a fiber reinforced polymer material, and are at least partially filled with a reinforcing material selected from the group including non-shrink or expansive concrete, non-shrink or expansive grout, non-shrink or expansive polymer, and/or sand. the tubular support members collectively form the load resisting system, the tubular support members comprising a plurality of longitudinal, substantially parallel, at least partially hollow structural members operatively connected by at least one connector member, the tubular support members being operatively connected to at least one or more lateral force resisting members (62a-62c, 71a, 71b, 72a, 72b, 73a, 73b, 85a, 85b, 92a-92c, 102a, 102b, 103a, 103b, 112), the lateral force resisting members being positioned in a direction perpendicular to the vertical plane of the tubular support members, the lateral force resisting members being capable of transferring vertical loads to the tubular support members and to providing lateral-load strength to the load resisting system, the lateral force resisting members comprising at least one corrugated sheet (92a-92c, 102a, 102b, 103a, 103b, 112), where the sheet corrugations run in a direction perpendicular to the vertical direction of the tubular support members, the lateral force resisting members comprising at least one of metal, fiber reinforced polymer materials, extruded PVC materials, polycarbonate materials, or wood-plastic composites; characterised in that the tubular support members are formed of a fiber reinforced polymer material, and are at least partially filled with a reinforcing material selected from the group including non-shrink or expansive concrete, non-shrink or expansive grout, non-shrink or expansive polymer, and/or sand.