为研 究 多肋 火 灾下混凝 土 T形 梁桥 的剪 力滞 变化规 律 ，以横桥 向 5片 T 形 梁组成 的
混 凝 土 简支 梁桥 为 背景进 行 分析 。采 用 ANSYS建 立混 凝 土 T 形 梁桥 多肋 火 灾模 型 ，分 析 多梁肋
在 对称 火荷 载作 用 下 ，混 凝 土 T形 梁桥 实体 剪 力滞 比 的 变化 特 征 。结 果表 明 ：所 有 梁肋 受 火 时 ，随
火温持 续 时 间的延增 ，剪力 滞比 呈指 数 曲线 趋 势逐 渐 增加 ，且 处 于 负剪 力 滞分 布 状 态 ；单侧 半 跨 5
片 梁肋 受 火 ，火温持 续 时 间在 2O min内时 ，剪 力滞 比变化 明显 ，火温持 续 时 间在 20～60 min时 ，剪
力滞 比基本 回至初值 ，且 随 火温持 续 时 间的延增 ，剪 力滞 比 时程 曲线逐 渐 向初 始状 态靠 拢 ，走 势 平
坦 ；桥跨 方 向 非连续 梁肋 受 火 ，近 火 梁肋 剪力滞 比显 著 。
关 键词 ：简支梁桥 ；T 形梁 ；多肋 ；火灾 ；剪 力滞 比 ；有 限元法
中图分 类号 ：U448．212 文 献标 志码 ：A
Study of Solid Shear Lag Ratios of Concrete T—-Girder
Bridge with Its M ultiple Girder Ribs Exposed to Fire
ZHANG Gang ，WANG Cui-juan ，XUAN Ji-ming。，HE Shuan—hal
(1． School of H ighway，Chang an University，Xi an 710064，China；2．School of Construction
Machinery，Chang an University，Xi an 710064，China；3．Architectural Planning，Design 8L
Research Institute of Zhejiang University of Technology，Hangzhou 310014，China)
Abstract：To study the varying laws of the shear lag of the concrete T—girder bridge with its
m ultiple girder ribs exposed to fire，a concrete simply-supported girder bridge comprised of 5 T—
girders in the transverse direction of the bridge was cited as an example and was analyzed． The
software A NSYS was used to build up the m odels of the T—girder bridge with its m ultiple girder
ribs exposed to fire and the varying features of the solid shear lag ratios of the bridge under the
action that the girder ribs were subj ected to the symmetric fire load were analyzed．The results of
the analysis show that when all the girder ribs of the bridge are exposed to fire。with the exten—
sion of the fire tem perature duration。the shear lag ratios present the tendency of gradually in—
creasing in the exponential curves and are in the state of negative shear lag distribution．W hen the
5 girder ribs of half a span on one side are exposed to fire and the fire temperature duration is
within 20 min，the varying of the shear lag ratios is significant． W hen the fire temperature dura—
tion is within 20～ 6O m in。the shear 1ag ratios basically come back to their initial values and with
the extension of the fire temperature duration， the time—history curves of the shear lag ratios
gradually approach their initial st．ate and the varying of the curves is flat． For the discontinuous

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