桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
4期
64-68
,共5页
连续梁桥%搭接长度%抗震设计%静力延性能力%回归分析%最小二乘法%有限元法
連續樑橋%搭接長度%抗震設計%靜力延性能力%迴歸分析%最小二乘法%有限元法
련속량교%탑접장도%항진설계%정력연성능력%회귀분석%최소이승법%유한원법
continuous girder bridge%seated length%seismic design%static ductility capacity%regression analysis%least square method%finite element method
针对我国抗震规范未给出连续梁桥墩梁之间搭接长度计算方法的情况，以四跨一联的两联连续梁桥为例进行研究。基于桥墩结构在静力荷载作用下的延性能力和DesRoches提出的最小支撑宽度的计算方法，分析不同跨径和墩高对连续梁结构伸缩缝处墩梁之间搭接长度的影响。根据相关参数的计算结果，以连续梁桥跨径和墩高为基本参数进行回归分析，采用最小二乘法拟合搭接长度计算公式。将拟合公式的计算结果与其他相关方法进行比较，结果表明：在计算连续梁桥伸缩缝处的搭接长度时，建议跨径计算值取一联联长；我国抗震规范中给出的简支梁伸缩缝处墩梁之间的搭接长度只适用于墩高小于25 m的桥梁结构，对于墩高大于25 m的高墩桥梁结构，需进行专门的研究。
針對我國抗震規範未給齣連續樑橋墩樑之間搭接長度計算方法的情況，以四跨一聯的兩聯連續樑橋為例進行研究。基于橋墩結構在靜力荷載作用下的延性能力和DesRoches提齣的最小支撐寬度的計算方法，分析不同跨徑和墩高對連續樑結構伸縮縫處墩樑之間搭接長度的影響。根據相關參數的計算結果，以連續樑橋跨徑和墩高為基本參數進行迴歸分析，採用最小二乘法擬閤搭接長度計算公式。將擬閤公式的計算結果與其他相關方法進行比較，結果錶明：在計算連續樑橋伸縮縫處的搭接長度時，建議跨徑計算值取一聯聯長；我國抗震規範中給齣的簡支樑伸縮縫處墩樑之間的搭接長度隻適用于墩高小于25 m的橋樑結構，對于墩高大于25 m的高墩橋樑結構，需進行專門的研究。
침대아국항진규범미급출련속량교돈량지간탑접장도계산방법적정황，이사과일련적량련련속량교위례진행연구。기우교돈결구재정력하재작용하적연성능력화DesRoches제출적최소지탱관도적계산방법，분석불동과경화돈고대련속량결구신축봉처돈량지간탑접장도적영향。근거상관삼수적계산결과，이련속량교과경화돈고위기본삼수진행회귀분석，채용최소이승법의합탑접장도계산공식。장의합공식적계산결과여기타상관방법진행비교，결과표명：재계산련속량교신축봉처적탑접장도시，건의과경계산치취일련련장；아국항진규범중급출적간지량신축봉처돈량지간적탑접장도지괄용우돈고소우25 m적교량결구，대우돈고대우25 m적고돈교량결구，수진행전문적연구。
In view of the fact that the calculation methods for the seated length between piers and girder of continuous girder bridge have not been provided in the seismic design codes of China , a continuous girder bridge that has two continuous units and that is arranged in each four spans in one unit was cited as an example and was studied .Based on the ductility capacity of the pier struc‐tures under the action of static load and the calculation method of minimum supported width pro‐posed by DesRoches , the influences of the different span length and pier height on the seated length of the piers and girder at expansion joint of the continuous girder bridge were analyzed .In accordance with the calculation results of the related parameters ,the span length and pier height of the continuous girder bridge were taken as the basic parameters and the regression analysis was carried out .The least square method was used to fit the calculation formula for the seated length and the calculation results of the fitted formula were compared to the those of other related meth‐ods .The conclusions drawn from the study are that for the calculation of the seated length at the expansion joint of the continuous girder bridge ,it is proposed that the length of one continuous u‐nit should be chosen as the calculation value of the span length .The seated length between the piers and girder at the expansion joint of the simply‐supported girder bridge as provided in seismic design codes of China is only applicable to the bridge structure with pier height less than 25 m and for the structure with pier height greater than 25 m ,special studies are required to be made .
