Experimental study on the bending performance and short-term rigidity theory of detachable support prestressed concrete composite plate
To address the issues of limited cracking load,the need for full-scale temporary supports during construction,and inherent reverse arching in the normal use of precast concrete composite plates with conventional steel trusses,our research group has proposed a detachable support precast concrete composite plate.Through static loading tests on three specimens with the same structural forms but different sizes,we have measured their cracking loads,deflection curves,strain distributions,and failure characteristics.The test results indicate that the detachable steel pipe truss can significantly increase the cracking load of the precast base plate,and its bending performance meets the load requirements during the construction phase.When the additional load is the constant load of the composite layer,the deflection of the specimen approaches 0,thus solving the reverse arching issue occurring during the normal use of the composite plate.The weaker web reinforcing bars are unable to form a uniformly continuous working entity between the upper chord rectangular steel pipe with large stiffness and the concrete base plate.Based on the test results,a reduction coefficient is introduced to correct the calculated cracking moment and short-term stiffness during the construction phase using the equivalent elastic modulus method.
万方数据
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