索桁架结构耐火性能试验研究及分析.pdfVIP

第

42

卷第

6

期Vol.42

No.6工程力学

2025年6

月June2025ENGINEERING

MECHANICS80

文章编号：1000-4750(2025)06-0080-13

索桁架结构耐火性能试验研究及分析

王广勇，方淳锟，苏

恒，刘人杰

(烟台大学土木工程学院，山东，烟台

264005)

摘

要：索结构常用于较大跨度的工程结构，索结构耐火性能研究可为其抗火设计提供实用方法。索由多根钢

丝组成，其传热机理较为复杂，而传热计算是索结构抗火设计的基础。进行涂覆薄涂型防火涂料的多种直径索

试件的温度场试验，对索中温度场的分布和发展规律进行试验研究。基于试验结果，提出了考虑空腔辐射传热

的索结构温度场计算模型，计算结果与试验结果基本吻合。针对典型的索桁架整体结构，对其高温下的力学性

能和破坏形态开展研究。研究结果表明：由于钢丝之间存在热阻，索试件中心测点升温比周围测点滞后，而且

随索直径增加，这种滞后作用越明显。高温作用下，索桁架结构的稳定索首先松弛，应力降至零，承重索最后

拉断，索桁架发生破坏。荷载增加，索桁架结构的耐火极限降低。稳定索的预应力增加，索桁架结构的耐火极

限不变，但索桁架结构保持较好工作状态的时间增加。

关键词：索结构；索桁架结构；火灾；温度；耐火性能

中图分类号：TU394

文献标志码：A

doi:

10.6052/j.issn.1000-4750.2023.01.0025

EXPERIMENTAL

STUDY

AND

THEORETICAL

ANALYSIS

ON

THE

FIRE

RESISTANCE

OF

CABLE

TRUSS

STRUCTURES

WANG

Guang-yong

,

FANG

Chun-kun

,

SU

Heng

,

LIU

Ren-jie

(School

of

Civil

Engineering,

Yantai

University,

Yantai,

Shandong

264005,

China)

Abstract:

Cable

structures

are

widely

used

in

larger

span

structures.

The

study

of

fire

resistance

of

cable

structures

can

provide

practical

methods

for

their

fire

resistance

design.

Cable

structures

are

composed

of

multiple

steel

wires,

and

their

heat

transfer

mechanism

is

relatively

complicated.

Heat

transfer

calculation

is

the

basis

of

the

fire

resistance

design

of

cable

structures.

In

this

study,

temperature

field

tests

were

firstly

conducted

on

various

diameter

cable

specimens

with

intumescent

coatings,

based

on

which

the

temperature

distribution

and

development

of

cable

structures

were

investigated.

Based

on

the

test

results,

a

finite

element

analysis

model

for

the

temperature

filed

of

cable

structures

considering

cavity

radiation

heat

transfer

was

proposed,

and

the

calculated

results

a