02950nas|a2200253 a 450000500170000000800410001703500150005810000260007324501110009926000670021030000230027749000270030050001440032750200580047152018140052965000240234365000210236770000280238870000500241670000490246671000570251581000590257285600650263120260817163745.0051225s2005    th uu|m rtt   0|  a1eng d  a.b119771880 aSongsak Suthasupradit13aAn assumed strain 4-node reinforced concrete shell element considering geometric and material nonlinearity  aPathum Thani, Thailand :bAsian Institute of Technology,c2005  a106 leaves :bill.1 aThesis ;vno. ST-05-12  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 2005  aA numerical method of analysis including both geometric and material nonlinearities has been presented for the analysis of reinforced concrete shell structures under short time loading. The response of reinforced concrete shell structures can be traced through its elastic, inelastic and ultimate load ranges. An automatic incremental solution of XFINAS is used so that structures with local instabilities or strain softening can also be analyzed. A layered four-node assumed strain shell element with equivalent smeared steel layers is developed to represent the reinforced concrete shell. Material properties can vary throughout the thickness and across the surface of a shell element. Material nonlinearities as a result of tensile cracking, tension stiffening between cracks, the nonlinear response of concrete in compression, and the yielding of the reinforcement are considered. The concrete models used are bases upon plasticity and continuum fracture theory with a biaxial stress states assumed for the shell elements. The steel reinforcement is assumed to be in a uniaxial stress state and is modeled as a bilinear material with strain hardening. An updated Lagrangian has been used to take into account the nonlinear geometry effects due to change in geometry of structure. The formulation is based upon small strains and rigid body rotations. An assumed natural strain method has been used to overcome the shear locking problem. Finally, a series of numerical examples including the reinforced concrete plates and nuclear reactor containment are analyzed by the computer program (XFINAS), based on the above principals, are presented and compared with the available theoretical and experimental results to demonstrate the applicability and validity of the present reinforced concrete shell element. 0aReinforced concrete 0aShells, Concrete1 aKim, Kidu,eChairperson1 aBarry, William Joseph,eExamination Committee0 aPichai Nimityongskul,eExamination Committee2 aRoyal Thai Government Fellowship,eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. ST-05-12  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B09986