不同支座工作模式下大跨度高鐵連續(xù)梁橋地震損傷性能對(duì)比研究
發(fā)布時(shí)間:2019-06-21 19:13
【摘要】:橋梁結(jié)構(gòu)在強(qiáng)震作用下的變形延性、滯回耗能和結(jié)構(gòu)損傷,是基于性能抗震設(shè)計(jì)的重要基礎(chǔ)。以京滬高鐵某代表性大跨度連續(xù)梁橋?yàn)閷?duì)象,建立考慮支座破壞滑移的多階段非線性力學(xué)行為(模型Ⅰ)以及支座保持理想工作狀態(tài)(模型Ⅱ)的兩種全橋模型,采用非線性時(shí)程積分方法對(duì)比分析了兩種模型在三種地震動(dòng)水準(zhǔn)下的抗震性能。研究表明,在順橋向,當(dāng)考慮了支座的破壞后滑移效應(yīng)時(shí),強(qiáng)震下支座進(jìn)入非線性工作狀態(tài)能夠降低固定墩的地震響應(yīng),但同時(shí)也相應(yīng)提高了邊墩的地震需求,其地震響應(yīng)在一定程度上有所提高。在橫橋向,支座保持理想彈性工作狀態(tài)使得上部梁體的地震作用直接傳遞到橋墩,顯著提高了各墩的變形和耗能需求。對(duì)于兩種計(jì)算模型,三種地震動(dòng)水準(zhǔn)下各墩的變形延性和損傷狀態(tài)均處于較低的水平,說(shuō)明我國(guó)大跨度高鐵連續(xù)梁橋具有較高的抗震能力。
[Abstract]:The deformation toughness, hysteretic energy dissipation and structural damage of bridge structures under strong earthquakes are important foundations of seismic design based on performance. Taking a representative long-span continuous beam bridge of Beijing-Shanghai high-speed railway as an object, two full-bridge models considering the failure slip of the bearing (model 鈪,
本文編號(hào):2504290
[Abstract]:The deformation toughness, hysteretic energy dissipation and structural damage of bridge structures under strong earthquakes are important foundations of seismic design based on performance. Taking a representative long-span continuous beam bridge of Beijing-Shanghai high-speed railway as an object, two full-bridge models considering the failure slip of the bearing (model 鈪,
本文編號(hào):2504290
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