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第一节单孔拱桥的震害与分析在刚性地基上的单孔拱桥,当其承载能力满足设计要求时,具有较高的抗震能力。一般要在9度及大于9度时才开始出现震害,它比刚性地基上的梁桥开始震害的烈度提高了两度之多。因此在《公路工程抗震设计规范》中规定:凡设计烈度低于9度,基础位于基岩或一般稳定土上的跨径不大于30米的单孔板拱拱桥可不进行抗震强度和稳定性验算。作者认为只要在烈度9度以下,满足承载能力的所有在刚性地基上的拱桥均可不作
Section 1 Earthquake Damage and Analysis of Single-hole Arch Bridge The single-hole arch bridge on rigid foundation has high seismic capacity when its bearing capacity meets the design requirements. Generally, earthquake damage begins only at 9 degrees and more than 9 degrees, which increases by more than twice as much as the seismic intensity of a bridge on a rigid foundation. Therefore, “Code for Design of Highway Engineering Aseismic Design” provides: Where the design intensity is less than 9 degrees, based on the bedrock or general stability of the span of not more than 30 meters in diameter single-hole arch bridge may not be seismic strength and stability check . The author believes that as long as the intensity of 9 degrees below, to meet the carrying capacity of all the rigid foundation on the arch bridge may not be