高温后高强高性能混凝土双轴压强度规律与破坏准则.pdf

Journal of Southeast University(English Edition) Vo1．24，No．2，PP．206—21 1 June 2008 ISSN 1003--7985 Strength regularity and failure criterion 0f plain HSHPC 1 ● ● 1 ● n J J ● ● ● J · UncIer DlaXlal C0mDresslon alter eXD0SUre t0 nl2n tem Deratures He Zhenjun Song Yupu (State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 1 16024，China) Abstract：Biaxial compression tests are performed on 100 nlnl× conventional analysis and design methods of reinforced con． 100 I／ira×100 nlnl cubic specimens of plain high—strength high— crete are generally still based upon material properties ob- performance concrete(HSHPC)at seven kinds of stress ratios， tained from the basic uniaxial strength test，although we or，：or =0：一1，一0．20：一1，一0．30：一1，一0．40：一1， know that a true uniaxial condition in structures is extremely 一 0．50：一1．一0．75：一1。and 一1．00：一1 after exposure to rare．In practice，many concrete structures such as spiral col- normal and high temperatures of 20．200，300，400。500 and 600 umns and their mode of building and nuclear reactor pres- ℃．using a large static．dynamic true triaxial machine．Friction． sure containers are under multiaxial stress states．At the reducing pads are three layers of plastic membranes with same time，with the wide use of computers，the finite ele- glycerine in．between for the compressive loading plane．Failure ment method and HSHPC in concrete structures．it has be． modes of the specimens are described．The two principally static come increasingly evident that it is quite important and ur- compressive strengths are measured．The influences of the gent for experimental studies on the mechanical properties of temperatures and stress ratios on the biaxia