某框架-核心筒结构控制构造裂缝用预应力效应分析  

ANALYSIS OF PRESTRESSING EFFECTS TO CONTROL CONSTRUCTION CRACKS IN A REINFORCED CONCRETE FRAME-TUBE STRUCTURES

作　　者：周威[1] 许名鑫[2] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]华南理工大学建筑设计研究院,广州510641

出　　处：《工业建筑》2010年第S1期159-161,165,共4页Industrial Construction

基　　金：黑龙江省自然科学基金项目(E200835);哈尔滨工业大学优秀青年教师培养计划资助项目(HITQNJS.2008.040)

摘　　要：某市市民服务中心为135.6 m长不设缝框架-核心筒结构建筑。为抵消或减小温差应力、混凝土收缩,特别是减小4个核心筒对温差变形与混凝土收缩变形的约束作用,避免楼盖产生构造裂缝,除采取在相关部位设置后浇带的措施外,在房屋顶层沿长向的框架梁与次梁内布置并张拉了直线形预应力筋。张拉时,一根框架梁的预应力筋出现了拉断事故。给出了考虑约束影响的温差及混凝土收缩应力,计算了拉断前后预应力效应,分析了预应力筋拉断对结构的不利影响,提出了相关处理措施。可供需控制构造裂缝的同类工程建设时参考。A service center for citizen is a frame-tube structure with 135.6-metre length.Construction joints have been used in the concrete floor,and compressive stresses in the horizontal beams of the top of the floor are provided by horizontal prestressing tendons at suitable spacing in order to counteract or minimize any tensile stresses by temperature,concrete shrinkage,and especially by the deformation restricted by four center tubes.This may eliminate construction cracks.Strand rupture accident occurs in stressing progress.The stress values of temperature and concrete shrinkage are presented.Prestressing effect is analyzed before and after strand rupture.The disadvantages of strand rupture are discussed.And some measures are proposed to deal with this accident.It may be served as reference for construction crack control of the resemble construction.

关 键 词：混凝土 温差应力 收缩 框架-核心筒 预应力效应 

分 类 号：TU378[建筑科学—结构工程]