H��W�n�H}�W4��.Xmv�y`�PO�`23��#��IV׽NU=����ea,Y $����q�*=����0�|��D.we�?C�'\�>�Do���\2��ˑ�.1��X��K��k0{M��u%����9�U�`��ΊvU�Oi^n�"K�x��������%S��at��xvݥ�^�y�k� =�����Q`.�q�����I 3.3 Lateral Load-Resisting System The lateral load-resisting system is others (described below). Questions or comments regarding this website are encouraged: Contact the webmaster. Professor Sudarshan's research and teaching at the University of Illinois have been recognized in the Big Ten Network’s (BTN) “Stories of Innovation, Impact and Inspiration.”, Course will award 1.5 hours of continuing education. Hence, we must deal with deformation compatibility issues and ductility requirements for reinforced concrete gravity columns during a seismic event, in accordance with ACI 318-11 Section 21.13. Reconnaissance efforts and other learning experiences from recent earthquakes have shown time and time again that reinforced concrete can demonstrate excellent ductility when it is appropriately reinforced. While gravity load generally acts downward, a lateral load is considered to act in the horizontal (or sideways) direction. The title of this article may seem like a trivial question, but it deals with an issue that in large measure might be overlooked. 2 corrects this reference to ACI 318-11 Section 21.13 – which is titled, “Members not designated as part of the seismic-force-resisting system”. Both use I wonder: For Condition B, induced moments and shears surpass member strengths and greater ductility detailing is in order, since the analysis predicts that the member will yield. @I��e�mY%k�x~(����P%߲�Ɉ9��c�B���lr�2Y ����(Y���*�+�qr�p�T. If we use the PT beams in the elastic model, will you use the cracked section or use the gross section as the PT is uncracked. Selection and layout of the systems is based on several structural planning considerations and design criteria (including building codes). Though not specifically designed to provide lateral stiffness, the performance and behavior of such elements can be significantly altered in a seismic event. endstream endobj 86 0 obj<> endobj 87 0 obj<> endobj 88 0 obj<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/ExtGState<>>> endobj 89 0 obj<> endobj 90 0 obj<> endobj 91 0 obj<> endobj 92 0 obj<> endobj 93 0 obj[/Indexed 102 0 R 255 107 0 R] endobj 94 0 obj[/Indexed 102 0 R 255 109 0 R] endobj 95 0 obj[/Indexed 102 0 R 255 111 0 R] endobj 96 0 obj<> endobj 97 0 obj<> endobj 98 0 obj<> endobj 99 0 obj<> endobj 100 0 obj<> endobj 101 0 obj<>stream Preliminary design of a building structure involves selection of gravity and lateral load resisting systems. 0000108377 00000 n 0000005057 00000 n 0000003953 00000 n Reprinting or other use of these materials without express permission of NCSEA is prohibited. 85 29 Essentially, these provisions provide triggers based on the levels of axial, bending and shear load that increase the need for seismic detailing – in many cases the same detailing as that required for members of the lateral-force-resisting system. A simple example of this is column ties. T he stiffness of the structure is only that of the SMRF system. 113 0 obj<>stream 0000003861 00000 n 0000111409 00000 n x�b```�=�@(������������q�=�)wb�1j6�z�q����:��s���ׅ�l�ky[�=`@��t�ex��iHg>~X3aN�F �.���'�\�G�b�*5�U��/5�X�m�ǏxuY�`.^�,����?ɱ�ȉG�"@Cz�{�j���Kq¸��'�~r�i��1�F�uvN͎@�!.��h �Lj@ �3�� g��8`BL01F ��b0�kL�)bˀ �)�aT����k���Xl� Tube structural system - Designing Buildings Wiki - Share your construction industry knowledge.