copyright [Ya'an] Optimization design drawing of bridge seismic measures for civil subgrade works of expressway
six
1. The expressway is located in the VII, VIII and IX earthquake zone, and various seismic measures such as anti falling chain, longitudinal tie rod, damper, rubber gasket, seismic stop and support are adopted in the design. Damper device: a damper is set between the pier (abutment) cap and the main beam at the bridge expansion joint, and each beam is set. In addition, dampers can be set at piers and abutments of expansion joints, and anti falling chain device: anti falling chain is set on each T-beam. After adjustment, the setting of anti falling chain shall meet the following two conditions at the same time - one is the bridge with more than three links (including three links); The second is that there are piers with a height of more than 30 meters (including 30 meters) in the middle of a bridge span. 2. Longitudinal tie bars between T-beams: the design requires that all piers and abutment caps of simply supported T-beam bridges should be provided with longitudinal seismic stops. At the same time, the design requires that longitudinal tie bars should be set between the transverse plates at the ends of two adjacent T-beams where expansion joints are set at the pier top to limit the relative displacement of the links. Longitudinal tie rod of anti falling beam: Φ s15.2 mm unbonded steel strand is used in the construction drawing stage, and now HRB400 reinforcement is used after adjustment; The longitudinal tie rods are divided into three types: type A, type B and type C, which are respectively applicable to 25m, 30m and 40m T-beam spans. 3. Embedded parts of shockproof rubber cushion blocks: for rubber cushion blocks in the transverse direction of small box girder and all rubber cushion blocks of T-shaped girder bridge, the embedded steel plate and anchor reinforcement shall be canceled, and the fixing angle steel shall be added to fix the rubber cushion blocks; For the rubber cushion block along the bridge of small box girder, only part of the embedded steel plate and anchor reinforcement will be canceled... 14 pieces in total, designed in 2009