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地震荷载是一种随机荷载,桥梁结构受到罕遇或超预期地震作用时,抗震措施能够有效地减小地震荷载的破坏程度。连梁装置是公路桥梁防落梁系统中的最终安全保护措施,用于避免桥梁上、下部结构相对位移过大、支座丧失支承功能后发生落梁。结合国内外连梁装置的相关设计标准,对设拉索式连梁装置的结构进行罕遇地震及强震序列动力时程分析,得出连梁装置的防落梁效果及内力随其拉索长度、设计位移量的变化规律。在地震作用下,经合理设计的连梁装置起到防落梁效果,增大结构的整体性、提高结构的抗推刚度,使地震荷载在各墩间平均分配。连梁装置在整个强震序列激励过程中均起到防落梁作用,可保证有损结构的通行能力,达到“大震不倒”的抗震设计原则。
Earthquake load is a kind of random load. When the structure of bridge is affected by rare or unexpected earthquake, anti-seismic measures can effectively reduce the damage degree of earthquake load. The beam-connecting device is the final safety protection measure in the anti-dropping beam system of highway bridges, which is used to avoid the relative displacement of the upper and lower parts of the bridge being too large, and the falling of the beam occurs after the supporter loses the supporting function. Combining with the related design standards of the beam-connecting device at home and abroad, the dynamic time-history analysis of rare earthquakes and strong earthquakes in the structure of the cable-stayed beam device is carried out, and the effect and internal force of the beam- Length, design changes in the amount of displacement. Under the action of earthquake, the rationally designed beam-connecting device plays the role of preventing falling off the beam, increasing the integrity of the structure and increasing the anti-push stiffness of the structure, so that the seismic load is evenly distributed among the piers. The beam device plays the role of anti-shedding beam during the excitation process of strong earthquake sequences, which can ensure the capacity of destructive structure and achieve the seismic design principle of “big earthquake does not fall”.