梁体刚度对某T梁桥抗震性能的影响  

Influence of beam stiffness on seismic performance of a T-beam bridge

作　　者：李霞 LI Xia(Shanxi Provincial Transportation Construction Engineering Quality Inspection Center(Co.,Ltd.),Shanxi Taiyuan 030006 China)

机构地区：[1]山西省交通建设工程质量检测中心(有限公司),山西太原030006

出　　处：《山东交通科技》2023年第2期96-98,101,共4页

摘　　要：为研究桥梁梁体刚度对连续梁桥的抗震性能影响规律,以混凝土弹性模量、梁体高度为分析参数,得出结论:弹性模量、梁高参数对各控制性截面的轴力、剪力、弯矩的计算结果无影响;当桥梁刚度降低时,桥梁截面的压应力储备值降低;当桥梁刚度发生改变后,桥梁跨中截面的速度、加速度、位移时程结果均受到一定程度的影响,尤其以10~20 s时的时程结果受到的影响更大,0~10 s、20~52 s期间的桥梁时程结果相差不大;对比分析不同工况下10~20 s的桥梁结构响应峰值,当梁高由2.2 m降低至2.1 m时,桥梁跨中截面速度峰值、加速度峰值、位移峰值结果分别升高12.5%、17.3%、20.2%。对比分析不同工况下10~20 s的桥梁结构响应峰值,当弹性模量由3.45×104 MPa降低至3.25×104 MPa时,桥梁跨中截面速度峰值、加速度峰值、位移峰值结果分别升高14.3%、11.7%、14.4%。In order to study the effect of bridge beam stiffness on the seismic performance of continuous girder bridges,this paper builds a Midas Civil finite element model based on a T-beam bridge.The concrete elastic modulus and beam height are used as analysis parameters.It is concluded that the elastic modulus and beam height parameters have no effect on the calculation results of the axial force,shear force and bending moment of each controlling section.When the bridge stiffness decreases,the compressive stress reserve value of the bridge section decreases.When the bridge stiffness decreases After the change,the velocity,acceleration,and displacement time-history results of the bridge mid-span section are all affected to a certain extent,especially the time-history results at 10~20 s are more affected.The time-history results of the bridges are not very different.The peak structural response of the bridge in 10~20 s under different working conditions is compared and analyzed.When the beam height is reduced from 2.2 m to 2.1 m,the peak velocity,acceleration and displacement results of the bridge mid-span section increase by 12.5%,17.3%and 20.2%respectively.By comparing and analyzing the peak structural response of the bridge from 10~20 s under different working conditions,when the elastic modulus decreased from 3.45×104 to 3.25×104 MPa,the peak velocity,acceleration and displacement results of the bridge mid-span section increased by 14.3%,11.7%and 14.4%respectively.

关 键 词：T梁桥 抗震性能 桥梁刚度 时程分析 

分 类 号：U448[建筑科学—桥梁与隧道工程]