Earthquake resistant structures

About: Earthquake resistant structures is a research topic. Over the lifetime, 1126 publications have been published within this topic receiving 27467 citations.

Reconsideration of Seismic Performance and Design of Beam-Column Joints of Earthquake-Resistant Reinforced Concrete Frames

Abstract: Seismic performance requirements for beam-column joints of earthquake-resistant reinforced concrete (RC) frames are discussed, and the experimental data of RC joints under cyclic loading collected from the literature are analyzed. It is observed that joint shear failure under cyclic loading is characterized by significant inelastic joint shear deformation. Joint shear strength should thus be formulated by limiting the influence of joint shear deformation on the seismic performance of RC frames. It is noticed that joint transverse reinforcement does not have significant influence on joint shear deformation and bond deterioration in the joints but may have significant influence on joint axial capacity under cyclic loading. Hence, the requirement for joint transverse reinforcement may be formulated by keeping the joint axial capacity not lower than the column axial capacity under seismic action. The influence of bond deterioration in joints on the seismic performance of RC frames and the anchorage requirement for beam reinforcement in joints are analyzed and discussed.

Masonry Bearing and Shear Walls Retrofitted With Overlay Composite Material

Abstract: : Unreinforced masonry bearing and shear walls common in the Tennessee Valley Authority's (TVA's) switch-house structures have been found to be vulnerable to earthquakes One technique to reduce the seismic vulnerability of these structures is to retrofit the masonry walls using the Hexcel-Fyfe TYFO(TM) system This system consists of a glass fiber fabric combined with special epoxies to create a high strength, lightweight structural laminate Hexcel-Fyfe TYFO(TM) can be designed to work in conjunction with existing walls to increase both the in-plane and out-of-plane seismic strength of the unreinforced masonry walls To ensure that this technique will perform its intended purpose, the US Army Construction Engineering Research Laboratories (USACERL) and TVA conducted seismic analysis and shake-table seismic testing using USACERL's Triaxial Earthquake and Shock Simulator The results of seismic testing documented in this report show that applying the overlay material to one side of the unreinforced masonry wall will enhance its seismic resistance

Finite Element Analysis of Precast Prestressed Beam-Column Concrete Connection in Seismic Construction

Abstract: In the past decade, a large number of precast concrete structures have been built all over many earthquake prone countries. This has been one answer to past statements of uneconomical construction and that construction activity should be automated. The connections between precast members normal1y constitute the weakest link in the structure, and the satisfactory performance and economy of precast concrete structures depend to a great extent on the proper selection and design of the connections. In the design of earthquake resistant structures that incorporate precast concrete elements the main difficulty has been to find efficient and economical methods for connecting the precast concrete members together, and create connections that give adequate strength, stiffness and ductility. The aim of the master’s project was to select by means of conceptual design and to examine by finite element analysis and analytical models the effectiveness of a precast prestressed beam-column concrete connection of a jointed system and to discuss alternative solutions. Various choices of structural solutions were to be studied within the project with regard to serviceability, production methods, maintenance and costs. The works should include literature studies and FE-analyses with the DIANA V9 program. This thesis presents the results of the finite element analysis to examine the effectiveness of a precast prestressed beam-column concrete connection of a jointed system and compares it with an analytical model. Results show that the seismic efficiency and the structural response of the analysed beam-column concrete connection under monolithic horizontal imposed displacement are satisfactory. The comparison of the finite element analysis and the analytical calculations converge quite well in the non-linear response. The design of the column of the selected beam-column concrete connection could be improved.