无黏结预应力混凝土连续板火灾后的试验研究  

Experimental Investigation of the behaviors of unbonded prestressed concrete continuous slabs after fire

作　　者：高立堂[1] 李晓东[1] 陈礼刚[1] 袁爱民[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《混凝土》2008年第2期25-27,53,共4页Concrete

基　　金：国家自然科学基金(50178034);国家自然科学基金重大国际合作研究项目(50320120156);国家重点基础研究专项经费(2001CB409603)

摘　　要：对9块12.6m×1.5m后张无黏结预应力混凝土三跨连续板在火灾后性能进行了检测。试验首先按照ISO834标准曲线升温,到一定时间后采用自然冷却方式进行降温,并维持2.0kN/m2的使用荷载不变。得出了板的变形及支反力、预应力变化情况,从而得出了灾后内力重分布的规律。裂缝基本没有新的发展,其宽度有所减小。为今后无黏结预应力混凝土结构的灾后行为研究提供依据。The fire behaviors of 9 unbonded prestressed concrete continuous slabs with three spans of 12.6 m length and 1.5 m width were detected,alter exposed to ISO834 standardized heating regime and 2.0 kN/m2 load.From the test results,the regularities of deformations,reactions and prestresses are presented.Regulations of internal force redistribution are given.Distributions of cracks of spans after fire have no increasing, and the cracks widths decrease.Conclusions of this study provide a basis for further research to explore fire behaviors of prestressed concrete structures with unbonded tendon.

关 键 词：火灾 连续板 温度梯度 预应力 

分 类 号：TU528.01[建筑科学—建筑技术科学]