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Research on optimization of seismic design of continuous rigid frame bridges with high and low piers based on parameters of main piers and tie beams
Published in Mohd Johari Mohd Yusof, Junwen Zhang, Advances in Civil Engineering: Structural Seismic Resistance, Monitoring and Detection, 2023
The main girder of continuous rigid frame bridge has more reasonable stress and larger span capacity because of the rigid frame system formed between main girder and pier. The pier plays an important role in structural force and has more advantages than continuous girder bridge (Zhang 2018). With the continuous advancement of bridge construction, large-span and high-low pier continuous rigid frame bridges are more and more common in complex engineering sites with complicated terrain conditions (Xu 2017). At present, the main pier of continuous rigid frame bridge generally adopts the structure form of double-legged thin-walled pier, which reduces the peak negative bending moment at the pier top of the main girder and make the distribution of internal force of the main girder more reasonable; Besides, the double-thin-walled pier has strong flexural and transverse torsional resistance along the bridge, which can ensure the safety and stability during the construction of the bridge. Although the pushing rigidity along the bridge is relatively small, the flexible structure system of high pier can effectively curtail the influence of concrete shrinkage and creep, temperature change and earthquake action (Xu 2017).
Experimental and Numerical Assessment into Frequency Domain Dynamic Response of Deep water Rigid-Frame Bridge
Published in Journal of Earthquake Engineering, 2022
Kai Wei, Jiarui Zhang, Shunquan Qin
Continuous rigid-frame bridge is a bridge, in which the superstructures and main piers are rigidly connected to act as a continuous unit (Feng 2014). It was commonly used as deepwater bridge, such as reservoirs and straits, due to its comparative advantages in both crossing ability and construction cost (Jiang et al. 2017c). However, the interaction between the vibrating submerged piers and the surrounding water could induce additional hydrodynamic forces exerting on the piers and increase the seismic vulnerability of deepwater bridges (Pang et al. 2015). The severe damage of Miaoziping Bridge during the Wenchuan earthquake, especially the enormous rehabilitation cost after the earthquake, has highlighted the importance of the hydrodynamic effects on the seismic performance of deepwater rigid-frame bridges (Guan, Zhang, and Li 2017; Zhang et al. 2019a).
Impact of pulse parameters on the seismic response of long-period bridges
Published in Structure and Infrastructure Engineering, 2020
Weibing Xu, Zhenyuan Luo, Weiming Yan, Yanjiang Chen, Jin Wang
The prototype bridge was a pre-stressed concrete continuous rigid frame bridge with high piers and a span arrangement of 45 m + 80 m + 80 m + 45 m (shown in Figure 1). The main beam was a box girder with variable cross section. The cross-section height was 5.2 m near the pier–beam consolidation, corresponding to 2.0 m near the middle section. The width of the cross section was 10.5 m. The substructure of the bridge was a double-limbed thin-walled rectangular hollow pier. The longitudinal and transverse dimensions of the pier were 5.5 m × 3.5 m. The maximum height of the prototype pier was 75 m. The natural vibration period of the prototype bridge was approximately 2.53 s. The prototype bridge is a typical long-period bridge.