A Study on Nonlinear Behavior for Trussliezd Prestressed-Concrete Beam
Date Issued
2007
Date
2007
Author(s)
Chang, Meng-Hsin
DOI
zh-TW
Abstract
Prestressed concrete elements are defined as reinforced concrete elements subjected to outer compressive force in tension side prior to loads acting on them. The force can neutralize amount of tension stress caused by designed loading, refrain the growing cracks, decrease the deflections, and increase the permanency, etc. Due to several stress limitations to prestressed concrete elements in provisions, it is difficult to realize the real behavior of prestressed concrete elements beyond the permission stressed stage without loading test.
Prestressed concrete and reinforced concrete elements can be divided into two categories: B region and D region. Both of which can be simulated as truss model.
The objected of this paper is to analyze the capacity curve of prestressed concrete beams（PCBs）. Firstly, the PCBs have to be transformed to the equivalent trusslized models. Secondly, sectional axial force-deformation curve of each bar can be both obtained by using sectional analytical program with the stress-strain relation of material and proposed simulated approach in this paper. Thirdly, the structure will be linearly analyzed by adopting SAP2000 software, and the member forces can be carried out. When the structure load is gradually increased, the structure behaves into nonlinear stage, and the Pseudo-elastic method is applied to transfer the energy exceeding the elastic range into plastic energy. Finally, the nonlinear behavior of simulated structure concluded the ultimate vertical forced, the maximum deflection of middle of beam can be analyzed and compared the results with real test curved to check their matching conditions. After four PCBs analyzing in this study, the simulated capacity curve can be well obtained to show that PCBs trusslized pseudo-elastic method is an acceptable and applicable method.
Subjects
預力混凝土梁
桁架化
擬彈性
容量曲線
Prestressed-Concrete Beam
Trusslized
Pseudo-elastic
Type
thesis
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